This manual

is for products
101SBD6*.

GAMATRONIC 3-PHASE MODULAR UPS

FOR THE 400 VAC GRID

UPS SYSTEM
Installation Guide
for models 50 kW - 200 kW

50 kVA model
200 kVA model
with internal battery

Release 4.7, April 2020

2MUM-PPCN/1
 GAMATRONIC, A SOLAREDGE DIVISION

Remember to register your product at

http://www.gamatronic.com/product-warranty/
in order to activate your warranty.

The use of an internal maintenance bypass switch with this UPS is not compatible with a parallel
configuration. If a parallel configuration with a maintenance bypass switch is desired, the maintenance
bypass switch must be external to the UPSs.

The product described in this document may cause interference with radio communications if not installed and used
according to the user guide and/or installation guide. Operation of the product in a residential area may cause harmful
interference, in which case the user will be required to correct the interference at his own expense. Be aware that the
product is intended for use in a commercial or industrial setting.

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 GAMATRONIC, A SOLAREDGE DIVISION

TABLE OF CONTENTS
1. SAFETY PRECAUTIONS .................................................................................................................... 7
1.1 Do’s ...................................................................................................................................... 7
Don’ts ............................................................................................................................................ 9
2. SYSTEM STRUCTURE ..................................................................................................................... 10
3. INSTALLATION ............................................................................................................................... 12
3.1 Installation Checklist .......................................................................................................... 12
3.2 Installation Procedure ........................................................................................................ 14
3.2.1 Visual Inspection ................................................................................................... 14
3.2.2 Site Preparation – Physical ................................................................................... 14
3.2.3 Site Preparation – Electrical .................................................................................. 16
3.2.4 Cabling .................................................................................................................. 16
3.2.5 Powering-up the system ....................................................................................... 29
3.3 Initial configuration ............................................................................................................. 30
3.3.1 Continuing first-time start-up process ................................................................... 33
3.3.2 Define the IP Address of Centric ........................................................................... 34
3.4 Testing................................................................................................................................ 35
3.4.1 Blackout Test ........................................................................................................ 35
3.4.2 Test Under Load ................................................................................................... 35
3.4.3 Check IP Communication with Controller ............................................................. 35
4. MISCELLANEOUS CONNECTIONS .................................................................................................... 36
4.1.1 Input and output dry contacts ................................................................................ 37
4.1.2 Emergency Power Off – EPO (manual) ................................................................ 39
4.1.3 LVD battery protector ............................................................................................ 40
5. INSERTING AND REMOVING POWER MODULES ................................................................................. 41
5.1 Insertion of power modules at system installation ............................................................. 42
5.2 Replacement of a module in an installed system .............................................................. 44
5.3 Addition of a module in an installed system ....................................................................... 46
5.4 Removing a module from an installed system ................................................................... 49
6. PARALLEL OPERATION .................................................................................................................. 52
6.1 Theory ................................................................................................................................ 52
6.1.1 Decentralized static switch method....................................................................... 52
6.1.2 Parallel communication ......................................................................................... 53
6.1.3 Current sharing ..................................................................................................... 54
6.1.4 EPO and parallel operation ................................................................................... 56
6.1.5 Manual bypass and parallel operation .................................................................. 56
6.2 Instructions for parallel configuration ................................................................................. 57
6.3 Replacing a UPS in a parallel configuration....................................................................... 65
6.3.1 Shutting down one unit in a parallel configuration ................................................ 66
6.3.2 Transferring the UPS to maintenance bypass mode ............................................ 67
6.3.3 Returning the UPS back to normal mode from maintenance bypass mode ......... 68
7. FALLBACK PUSH-BUTTON CONTROL PANEL .................................................................................... 69
8. CIRCUIT BREAKER SELECTIVITY ..................................................................................................... 70
9. USING THE UPS WITH A GENERATOR ............................................................................................. 72
9.1 The Automatic Transfer Switch (ATS) ............................................................................... 72
10. PERIODIC PREVENTIVE MAINTENANCE ............................................................................................ 74
10.1 Objectives .......................................................................................................................... 74
10.2 Recommended Tools ......................................................................................................... 74

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 GAMATRONIC, A SOLAREDGE DIVISION

10.3 Maintenance Procedures and Report ................................................................................ 75

11. SERVICE AND REPAIRS .................................................................................................................. 78

LIST OF FIGURES

Figure 1: Major components of the Centric (200 and 100 kW models) ....................................... 10
Figure 2: Major components of the Centric (50 kW model) ......................................................... 11
Figure 3: Recommended clearances around the Centric UPS .................................................... 15
Figure 4: Main power terminals on the rear of the Centric .......................................................... 18
Figure 5: Close-up of the main terminals (200 kW model) ........................................................... 19
Figure 6: Close-up of the main terminals (100 kW model) ........................................................... 19
Figure 7: Close-up of the main terminals (50 kW model) ............................................................. 20
Figure 8: Recommended standard system connections ............................................................. 22
Figure 9: Recommended system connections, with input isolation transformer ..................... 23
Figure 10: Attaching the cable stress reliever .............................................................................. 26
Figure 11: Attaching the cable stress reliever – another view .................................................... 26
Figure 12: Connecting the battery cabinet to the UPS ................................................................. 28
Figure 13: Initial configuration wizard, "Start" screen ................................................................. 30
Figure 14: Initial configuration wizard: password entry .............................................................. 30
Figure 15: Initial configure wizard: number of battery sets ........................................................ 31
Figure 16: Initial configure wizard: battery capacity in Ah ......................................................... 31
Figure 17: Initial configure wizard: set time zone ........................................................................ 32
Figure 18: Finish configuration wizard .......................................................................................... 32
Figure 19: The "alarms" icon indicates alarm conditions ............................................................ 33
Figure 20: IP address configuration ............................................................................................... 34
Figure 21: Minor connector groupings on the Centric rear panel ............................................... 36
Figure 22: Closer view of dry contact terminals in connector group 1 ...................................... 37
Figure 23: Close-up of connector group 2 ..................................................................................... 38
Figure 24: Pin numbers in D9 connectors ..................................................................................... 38
Figure 25: Connections for EPO switch and battery trip coil ...................................................... 39
Figure 58: LVD wiring diagram ........................................................................................................ 40
Figure 26: Location of the UPS modules in the 200, 100, and 100 kW models .......................... 43
Figure 27: Turning off a module (200 kVA system) ...................................................................... 44
Figure 28: "Status > Modules" screen ........................................................................................... 44
Figure 29: Verifying status of replacement module ...................................................................... 45
Figure 30: Status > Modules > Output ............................................................................................ 46
Figure 31: “Model Type” screen for a 175 kW system ................................................................. 47
Figure 32: ”Model Type” screen for a 200 kW system ................................................................. 47
Figure 33: “Number of modules” screen ....................................................................................... 47
Figure 34: Verifying status of added module ................................................................................ 48
Figure 35: Status > Modules > Output ............................................................................................ 49
Figure 36: “Number of modules” screen ....................................................................................... 50
Figure 37: Turning off a module ..................................................................................................... 50
Figure 38: "Status > Modules" screen ........................................................................................... 51
Figure 39: The static switch in context (stand-alone system) ..................................................... 52
Figure 40: Parallel comm. connections (cable cat.no. GPIN15350) ............................................ 53
Figure 41: Conceptual view of current sharing connections for 3 UPSs ................................... 54
Figure 42: Conceptual view of current sharing connections for 4 UPSs ................................... 54
Figure 43: Conceptual summary of special cabling for parallel operation ................................ 55
Figure 44: Current-sharing cable .................................................................................................... 56
iv Centric Installation Guide, rel. 4.7
 GAMATRONIC, A SOLAREDGE DIVISION

Figure 45: Cable lengths in a parallel configuration ..................................................................... 57

Figure 46: Rear of the Centric, showing the PC3001 circuit board ............................................. 59
Figure 47: Closeup of the master jumper ....................................................................................... 59
Figure 48: Parallel communication cable with 15-pin connectors .............................................. 59
Figure 49: The main menu screen .................................................................................................. 60
Figure 50: Ac output voltage display, per module ........................................................................ 61
Figure 51: Connection diagram for two parallel Centric units .................................................... 63
Figure 52: Connection diagram for three parallel Centric units .................................................. 64
Figure 53: Location of fallback push-button control panel.......................................................... 69
Figure 54: Close-up of the push-button control panel ................................................................. 69
Figure 55: A UPS's bypass circuit .................................................................................................. 70
Figure 56: Timing variables when using a generator and an ATS .............................................. 72
Figure 57: Example of an ATS control panel ................................................................................. 73

LIST OF TABLES

Table 1: Recommended clearances ............................................................................................... 15

Table 2: Maximum input currents ................................................................................................... 24
Table 3: Recommended circuit breaker / switch ratings .............................................................. 25
Table 3.1: (Icw) Rated short time withstand current and I(pk) Rated Peak short circuit value.25
Table 4: Minimum recommended size of battery cables* ............................................................ 27
Table 5: Battery lifetime vs environmental temp. (Illustrative, as per Eurobat) ........................ 29
Table 6: D9 pin assignments in connector group 2 ...................................................................... 38
Table 7: Cable sets for parallel configurations ............................................................................. 58
Table 8: CB settings for safe removal of the unit ......................................................................... 66
Table 9: Normal Mode CB Configuration ........................................................................................ 67
Table 10: Maintenance Bypass Mode CB Configuration ............................................................... 68
Table 11: Position of the CBs in normal mode ............................................................................... 68

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STANDARDS AND CONVENTIONS

This user manual contains diagrams which include images of the UPS’s display screen. Unless otherwise
indicated, the readings shown in the screen images are representational only, and are not intended to
match the readings on a specific system in a particular environment.
Operation and control of the Centric UPS is accomplished through a touch-sensitive LCD display screen.
In this manual, the terms "tap", "press", "choose", and "select" may be used interchangeably to indicate
selection of an option on a menu screen.
Electrical abbreviations in this document are according to IEEE 280 Standard Letter Symbols for Quantities
Used in Electrical Science and Electrical Engineering.

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1. SAFETY PRECAUTIONS
The UPS system is designed for industrial applications and harsh environments. Nevertheless the
UPS is a sophisticated power system and should be handled with appropriate care, according to
the following guidelines.

WARNING – HIGH TOUCH CURRENT!

EARTH CONNECTION ESSENTIAL BEFORE
CONNECTING SUPPLY.

WARNING
This system can cause DC in the PE line.

WARNING
ALL IT INSTALLATIONS SHALL REQUIRE AN
ISOLATION INPUT TRANSFORMER.
THE SYSTEM WORKS WITH ALL TN-X-X AND TT
INSTALLATIONS.
ALL PE BONDING OF THE SYSTEM MUST COMPLY
WITH LOCAL CODE IN ACCORDANCE TO THE GIRD
TYPE.

1.1 Do’s
 Read this manual carefully before starting installation and operation of the UPS.
 Review the safety precautions described below to avoid injury to users and damage to the
equipment.
 UPS must be installed in a restricted access location only.
 All power connections must be completed by a licensed electrician who is experienced in
wiring this type of equipment, and who is familiar with the local electrical codes and
regulations. Improper wiring may cause injury to personnel, or death, or damage to the
equipment.
 Ensure all power is disconnected before performing installation or maintenance.
 Leave at least 20 cm of clearance space between the ventilation openings of the UPS and other
objects or walls.
 The UPS must be well grounded to the building’s grounding system with a conductor that has a
current carrying capacity that matches the rating of the UPS.

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 GAMATRONIC, A SOLAREDGE DIVISION

 Battery installation, battery maintenance, and battery replacement shall be performed only by
authorized service personnel.
 Pay attention to all DANGER, CAUTION, and WARNING notices affixed to the inside and outside
of the UPS.
 Keep the surroundings clean, uncluttered and free from excess moisture.
 Keep the operating environment within the parameters stated in this document.
 Allow only qualified technicians to service the UPS. There are no user-serviceable components. Do
not try to repair it yourself!
 Use the UPS only for its intended purpose.
 The batteries should preferably be installed next to the UPS, or as close to it as is practically
possible.
 If you remove a UPS module from the Centric while the module is operating, wait five minutes
before reinserting the module. This allows the module’s capacitors time to discharge.
 FAST FUSES (SEMICONDUCTOR FUSES) must be used between the battery and the Centric,
and on the rectifier ac input line. For example, the Ferraz Shawmut A70QS fuse.

WARNING - RISK OF LETHAL ELECTRIC SHOCK:

The battery cabinet contains a series of batteries that provides high voltage and energy in
the UPS body even when the UPS is not connected to the ac input.
Take appropriate precautions during installation, inspection and servicing.

WARNING - RISK OF LETHAL ELECTRIC SHOCK:

Units that come with internal manual/maintenance bypass circuit breakers are under high
voltage. All internal parts of the UPS remain under high voltage until ALL ac and dc has
been turned off from their CBs or fuses.

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 GAMATRONIC, A SOLAREDGE DIVISION

Don’ts
 Do not open the cover of the UPS or the battery cabinets under any circumstances. All UPS panels
and doors should be closed.
 Do not insert any objects through the ventilation holes.
 Do not put objects on the UPS.
 Do not move the UPS while it is operating.
 Do not use the UPS outdoors. This unit is designed up to pollution degree 2 only.
 Do not turn the UPS upside down during transportation.
 Do not connect or disconnect the cable to the battery cabinet before the battery circuit breaker is
turned OFF.
 Do not turn ON the battery circuit breaker when the battery cabinet is disconnected from the UPS.
 Do not install the UPS next to gas or electrical heaters. A restricted location is recommended in
order to prevent access by unauthorized personnel.
 If you remove a UPS module from the Centric while the module is operating, do not reinsert the
module immediately. Wait five minutes.

WARNING:
RISK OF SEVERE DAMAGE TO THE UPS!!!

THIS SYSTEM REQUIRES THE NEUTRAL LINE FOR

OPERATION. DO NOT CONNECT THIS SYSTEM TO THE
AC POWER SOURCE WITHOUT A NEUTRAL (NULL)
CONDUCTOR!!
FAILURE TO USE A NEUTRAL CONDUCTOR MAY
CAUSE PERMANENT DAMAGE TO THE SYSTEM.

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 GAMATRONIC, A SOLAREDGE DIVISION

2. SYSTEM STRUCTURE
The Centric is available in three cabinet sizes:
 200 kVA – holds up to eight internal UPS modules

 100 kVA – holds up to four internal UPS modules

 50 kVA – holds up to two internal UPS modules

Each UPS module has a maximum output capacity of 25 kVA / 25 kW.

Each Centric unit also includes:
 a system controller
 a static switch module
 an LCD control panel

200 kW model 100 kW model

Figure 1: Major components of the Centric (200 and 100 kW models)

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 GAMATRONIC, A SOLAREDGE DIVISION

Figure 2: Major components of the Centric (50 kW model)

WARNING
FOR ALL UNITS WITH BUILT IN BATTERY BREAKER
THERE MUST BE ADEQUATE CLEARANCE OF
ACCESS. IF THIS IS NOT POSSIBLE THE BATTERY
BREAKER MUST BE UNINSTALLED AND
REMOUNTED ON THE WALL ADJACENT TO THE
SYSTEM.

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 GAMATRONIC, A SOLAREDGE DIVISION

3. INSTALLATION
ALL POWER CONNECTIONS MUST BE COMPLETED BY A LICENSED
ELECTRICIAN WHO IS EXPERIENCED IN WIRING THIS TYPE OF
EQUIPMENT, AND WHO IS FAMILIAR WITH THE LOCAL ELECTRICAL
CODES AND REGULATIONS.

IMPROPER WIRING MAY CAUSE INJURY TO PERSONNEL AND/OR

DAMAGE TO THE EQUIPMENT.

3.1 Installation Checklist

Complete the following checklist as you perform the installation, initialization, configuration, and testing
procedures. Refer to the appropriate sections (specified in the Reference column) for detailed information
about each checklist item.
When the checklist is complete, send it to Gamatronic at support@gamatronic.com.
UPS model and configuration
Customer Address

Site Phone E-mail

Serial numbers: System_________________Static Switch ____________________
Modules 1___________ 2___________ 3___________ 4___________5___________
6___________ 7___________ 8___________
Technician Name Date Signature

√ Operation Requirement Reference

Visual Inspection
Verify the physical integrity of the system No physical damage ‎3.2.1

Comments on visual inspection: __________________________________________________

_______________________________________________________________________________
_______________________________________________________________________________

S i t e P r e p a r a t i o n – P h ys i c a l
Recommended:
betw. +15 °C and +25 °C
(+59 °F and +77 ° F)
Check ambient temperature. ‎3.2.2 Step 1
Min/max: –10 °C and +40 °C
(+14 °F and +104 °F)
Check humidity and condensation. No condensation/dampness. ‎ .2.2 Step 2
3
Check ventilation. Proper airflow to batteries. ‎3.2.2 Step 3
Check foundation and access. Adequate structure and access. ‎3.2.2 Step 4
Check for adequate clearances. See Table 1 and Figure 3. ‎3.2.2 Step 5

Comments on site preparation – physical: __________________________________________

_______________________________________________________________________________
_______________________________________________________________________________

12 Centric Installation Guide, rel. 4.7

 GAMATRONIC, A SOLAREDGE DIVISION

√ Operation Requirement Reference

Site Preparation - Electrical

Verify that appropriate sized circuit breakers are

present on the electrical boards supplying the
Meet local code and Gamatronic
Centric. Read Chapter ‎8 in this Installation Guide. ‎3.2.3 Step 1
recommendations.
Refer to Figure 8 or Figure 9. Refer to Table 2 and
Table 3.
Verify that the cables between the electrical board
and the UPS, and between the UPS and its loads,
and also the ground/PE cables, are of appropriate Meet local code and Gamatronic
‎3.2.3 Step 2
sized input and output power. Refer to Figure 8 or recommendations.
Figure 9, and see Table 2 for amperage of rectifier
and bypass input lines.
Phase-to-Phase: 3x400 Vac,
-20 % / +15 %
Verify ac input voltages. ‎3.2.3 Step 3
Phase-to-Neutral: 230 Vac,
-20 % / +15 %
Verify the voltage between neutral and ground. 0–2 Vac ‎ .2.3 Step 4
3
Verify dc voltage at battery cabinet switch. +360 V and – 360 V ‎3.2.3 Step 5
Neutral connection will always be
Verify that neutral is always connected. ‎3.2.4.1
unbroken during UPS operation.
Verify that the circuit breakers on the electrical
Circuit breakers for ac input and
board for the UPS ac input, bypass input and ‎3.2.4.2
output are "OFF".
output lines are in the "OFF" position.
Attach ac input, bypass ac input, and output cables Ac input, bypass, and output
‎3.2.4.2
to the Centric (refer to Figure 8 or Figure 9). cables are attached.
Attach the cable stress reliever Cable stress reliever attached. ‎3.2.4.4
Batteries are assembled and
Assemble and connect the batteries within the
ready for operation or for ‎3.2.4.5
battery cabinet, verify proper voltage.
charging.
Verify that the connection of the battery to the UPS
is according to the diagram and instructions in
section ‎3.2.4.5. Batteries are connected according
to recommendations and with
FAST FUSES (SEMICONDUCTOR FUSES)
proper fuse values.
must be used between the battery and the
Centric. For example, the Bussmann “FWH” fuse.
Verify that there is a switch or other means to
The batteries can be easily and
easily and safely disconnect the battery cabinet
quickly disconnected from the
from the UPS in the event of an emergency or for
UPS when necessary.
maintenance.
With the battery circuit breaker "OFF", connect the
battery cable to the UPS. Leave the battery circuit Batteries are connected and OFF. ‎3.2.4.5
breaker "OFF".
Locate the cable for the LCD display screen – it
should be projecting out from the top front of the Cable is ready. ‎7
UPS near the mounting post of the LCD screen.
Attach the LCD display screen to the top front of LCD screen is attached and its
the UPS, then connect the cable to its right side. cable connected.
Power-up the system. LCD screen is on. ‎ .2.5
3
Perform the initial configuration. Initial configuration completed. ‎3.3
Complete first-time startup. First-time startup completed. ‎3.3.1
If you are using lithium-ion batteries, verify that
Compare the values of the battery
the systems is an LI system, then verify that the User’s Guide,
setup parameters against the
battery setup parameters (Setup > Battery) are “Setup > Battery”
battery manufacturer’s data sheet.
appropriate for the batteries you have chosen.
Perform post-startup tests. Tests successfully completed. ‎3.4

Comments on site preparation – electrical: __________________________________________

_______________________________________________________________________________
_______________________________________________________________________________

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 GAMATRONIC, A SOLAREDGE DIVISION

3.2 Installation Procedure

After completing each step in the following installation, go back to the Installation Checklist and place a
check mark next to the corresponding item.
The Centric comes in various models and configurations. The following installation instructions cover all
models and configurations. Any parts of the instructions that apply only to a specific model or configuration
are clearly indicated as such. If no such indication is present, the procedure applies to all models and
configurations.

3.2.1 Visual Inspection

Perform the inspection described here immediately after unpacking the Centric.
1. Inspect the Centric from all sides and ensure that there is no visible damage to any portion
of the housings or covers.
2. Ascertain that the number of modules delivered is as ordered, and that a system controller
module was delivered.

3.2.2 Site Preparation – Physical

Perform the following procedures before connecting any external cables to Centric.
1. Ensure that the ambient temperature in the immediate vicinity of Centric complies with
Gamatronic requirements:
Minimum/maximum operating temperatures: –10 °C / +40 °C (+14 °F / +104 °F).
Recommended operating temperature: between +15 °C and +25 °C (+59 °F and +77 °F).
2. Verify that there is no water condensation or dampness at the installation site.
3. Ensure that sufficient airflow or forced ventilation is present at the location of the battery
cabinets.
4. Verify that the foundation and access routes are adequate for the dimensions and weight of
the UPS and battery cabinets.
5. Ensure that there are adequate clearances to allow comfortable access to battery cabinets
and electrical boards. Recommended minimum clearances around the Centric are
provided in Table 1 and Figure 3.
6. It is recommended that the battery cabinets be located as close to the UPS as is practically
possible.

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Table 1: Recommended clearances

RECOMMENDED MINIMUM CLEARANCE AROUND THE CENTRIC

Front 110 cm Minimum adequate clearance for user access and service.
Rear 100 cm (39 in.) Minimum adequate clearance for cable connections.
No minimum clearance provided that the UPS is not placed next to
heat-emitting equipment or other electronic equipment. If the UPS is
placed next to heat-emitting equipment or electronic equipment, leave
Sides --
at least 20 cm free space between the UPS and the other equipment.
The object here is to avoid subjecting the UPS to additional heat and to
protect the UPS from stray electronic signals.

Figure 3: Recommended clearances around the Centric UPS

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3.2.3 Site Preparation – Electrical

Perform the following procedures before connecting any external cables to Centric.
1. Read Chapter ‎8 “Circuit breaker selectivity” in this installation guide. That chapter includes
considerations regarding the size of the external circuit breakers on the rectifier input and
bypass input lines.
2. Verify that circuit breakers on the electrical board that supplies Centric are compliant with
local and national codes and Gamatronic system specifications.
3. Verify that the input and output power cable connections, GND, and neutral lines comply
with local and national codes and are appropriate for the circuit breakers protecting them.
4. Measure the ac input voltage. Phase-to-phase voltage (measured between L1-L2, L2-L3,
and L3-L1) should be 3x400 Vac ±10 %. Phase-to-neutral voltage (measured at L1, L2, and
L3) should be 230 Vac, ±10 %.
5. Verify that voltage between neutral and ground is between 0 and +2 Vac.
6. Check the dc voltage at the switch of the battery cable and verify that it is at least
+385 V and -385 V.
7. FAST FUSES (SEMICONDUCTOR FUSES) must be used between the battery and the Centric.
For example, the Bussmann “FWH” fuse.

3.2.4 Cabling
3.2.4.1 NEUTRAL LINE
During both installation and operation of the Centric, a neutral line must always be
connected to the UPS. This neutral line must be connected at all times while the UPS is
working and should not be disconnected at any time.
Caution: If at any time the neutral line becomes disconnected, there will be no input or
output reference voltage because the input neutral line and the output neutral line are
physically linked together. This may result in the system defining its own reference voltage,
which will be set by the load distribution between the three phases. This may cause
serious damage to the UPS.

Caution: A 4-pole switching system can disconnect the neutral line.

Warning: If you have a four-pole mains-to-generator switching system, you are in danger
of having the neutral line disconnected when the four-pole switch is operated. This can
result in the problems described above.
To avoid these problems, we strongly recommend that if you use a four-pole mains-to-
.
generator switching system, you install an isolation transformer that constantly provides a
neutral line to the UPS.

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3.2.4.2 AC INPUT AND OUTPUT CONNECTIONS

WARNING! RISK OF ELECTRICAL SHOCK OR INJURY!

INSTALLATION MAY BE PERFORMED BY QUALIFIED TECHNICIAN ONLY!

WARNING! HIGH TOUCH CURRENT!

EARTH CONNECTION ESSENTIAL BEFORE CONNECTING SUPPLY.

WARNING
ALL IT INSTALLATIONS SHALL REQUIRE AN ISOLATION
INPUT TRANSFORMER.
THE SYSTEM WORKS WITH ALL TN-X-X AND TT
INSTALLATIONS.
ALL PE BONDING OF THE SYSTEM MUST COMPLY WITH
LOCAL CODE IN ACCORDANCE TO THE GIRD TYPE.
The UPS can be connceted to any class 3 infertsructure, the UPS provides calss 2 input
lightning protection and class 1 output protection while operating in normal mode. For dual
feed insallation, the installer is required to add a separate lightning protector in the bypass
input circuit breaker cabinet.

Before connecting the main input and output cables to the Centric main terminals, verify that the circuit
breakers on the feed board are in the OFF position.
Connect the rectifier ac input, bypass ac input, and ac output cables to the Centric.
Refer to Figure 8 or Figure 9, and to Figure 4 and Figure 6 below. The lower rear panel of the Centric must
be removed for access to the main terminals.
To the electrical board to which the UPS is connected, affix a sign or label with the following
content:

WARNING: There is a UPS attached to this electrical board. The UPS’s neutral line also
serves as its ground connection. To avoid electric shock, DO NOT DISCONNCECT THE
UPS’s NEUTRAL LINE WHEN THE UPS IS OPERATING.

In the event that the UPS has been disconnected from the ac mains for four months or
longer following its delivery to the customer site, the UPS must be connected to the ac
mains and operated with no load for a period of four hours, before applying a load.

Any connection diagrams and/or installation instructions in this document are Gamatronic's
recommendation for connecting the UPS to the infrastructure of a typical customer site. These
recommendations are subject to modification, if such modification is necessary to bring the
installation into compliance with the local, state, provincial, or national electrical laws and
regulations in effect at the installation site, in whatever country that may be.

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200 kW model 100 kW model

RECOMMENDED TORQUE VALUES

FOR MAIN AC AND DC
TERMINAL CONNECTIONS

200 kW model: 25~30 Nm

100 kW model: 6~12 Nm

50 kW model: 1.9 Nm

50 kW model

Figure 4: Main power terminals on the rear of the Centric

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Figure 5: Close-up of the main terminals (200 kW model)

(Recommended torque value for main ac and dc terminal connections: 25~30 Nm)

Figure 6: Close-up of the main terminals (100 kW model)

(Recommended torque value for main ac and dc terminal connections: 6~12 Nm)

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 GAMATRONIC, A SOLAREDGE DIVISION

Figure 7: Close-up of the main terminals (50 kW model)

(Recommended torque value for main ac and dc terminal connections: 1.9 Nm)

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3.2.4.3 CONNECTING THE CENTRIC TO THE ELECTRICAL

PANEL

Any connection diagrams and/or installation instructions in this document are Gamatronic's
recommendation for connecting the UPS to the infrastructure of a typical customer site. These
recommendations are subject to modification, if such modification is necessary to bring the
installation into compliance with the local, state, provincial, or national electrical laws and
regulations in effect at the installation site, in whatever country that may be.

Suitably rated circuit breakers must be installed between the Centric and the electrical panel.
Refer to Figure 8 or Figure 9 for system connections, and Table 2 and Table 3 for circuit breaker
recommendations.
See Chapter ‎8 for a discussion of the issue of circuit breaker selectivity.
Connection of the Centric UPS to the electrical panels must be performed only by a licensed
electrician experienced with similar systems.

Warning: When two separate input lines are used for rectifier and bypass input,
the Neutral line must be shared (as in Figure 8 and Figure 9).

Warning: When using a residual current device on the UPS output it must be Type B.

In the event that the UPS has been disconnected from the ac mains for four
months or longer following its delivery to the customer site, the UPS must be
connected to the ac mains and operated with no load for a period of four hours,
before applying a load.

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Figure 8: Recommended standard system connections

For recommended circuit breaker ratings, see Table 2 (page 24) and Table 3 (page 25).

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Figure 9: Recommended system connections, with input isolation transformer

For recommended circuit breaker ratings, see Table 2 (page 24) and Table 3 (page 25).

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Table 2: Maximum input currents

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Table 3: Recommended circuit breaker / switch ratings

Note: If local electrical codes are stricter than the above recommendations, the local
codes take priority.

Table 4.1: (Icw) Rated short time withstand current and I(pk) Rated Peak short circuit value.

UPS MODEL I(cw) [A] I(pk) [A]

Centric 50k 575 1700
Centric 100k 1000 2500
Centric 200k 1800 3200

IMPORTANT:
Protective device must be configured to open within:
 1 grid cycle upon I (sc) ≤ 10 I(n)
 4 grid cycles upon I (sc) ≤ 5 I(n)

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3.2.4.4 ATTACH THE CABLE STRESS RELIEVER

Figure 10: Attaching the cable stress reliever

Figure 11: Attaching the cable stress reliever – another view

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3.2.4.5 ASSEMBLING AND CONNECTING THE BATTERIES

Notes:
● The battery must be connected to the UPS and available (battery fuses in place) at initial system
startup.
● The Centric supports the use of standard lead-acid batteries, and also lithium-ion batteries. If you plan
to use lithium-ion batteries, consult with your dealer to be sure that the battery setup parameter values
are appropriate for the batteries you will be using.

1. It is recommended that the battery cabinet(s) be located as close to the UPS as is

practically possible.
2. Assemble the batteries within the battery cabinet. Figure 12 shows the recommended
connection method, which includes two fuses inside of each battery cabinet, one on the
plus line and one on the minus line. The recommended fuse values for one set of two
cabinets of 30 x 12 Vdc each are shown in Figure 12, according to the output capacity of
the UPS.
3. Measure the dc voltage at the main terminals of the battery cabinet. Verify that you obtain
values of at least +360 Vdc (red) and at least –360 (black) with reference to N (blue).
4. Connect each battery cabinet to a circuit breaker or switch with fuses according to Figure
12. The recommended fuse value for two battery cabinets is shown in Figure 12, according
to the output capacity of the UPS. The two switches or circuit breakers (one for each
battery cabinet) should be located as close as possible to the UPS.
5. Connect the two switches or circuit breakers to the Centric battery terminals. Refer to
Figure 12. Observe proper polarity! Minimum recommended cable size between the
battery box and the UPS is shown in Table 5

For the 200 kVA model, the battery’s “midpoint” connection is to the Centric’s neutral bus
bar (see Figure 5.)

Table 5: Minimum recommended size of battery cables*

UPS Power Minimum cable
2
(kVA) size (mm )
50 16
75 35
100 50
125 70
150 95
175 120
200 150
* Values are for 10 min. backup time,
and are based on IEC6950 Table 3B and NEC Table 310.16.
For longer backup times please consult Gamatronic’s customer service department.

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Figure 12: Connecting the battery cabinet to the UPS

FAST FUSES (SEMICONDUCTOR FUSES) must be used between the battery and the Centric.
For example, the Bussmann “FWH” fuse.

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Protect the batteries from moisture, dampness, and foreign substances.

The temperature of the battery's surroundings influences the batteries' useful lifetime.
Table 6: Battery lifetime vs environmental temp. (Illustrative, as per Eurobat)

ENVIRONMENTAL ACHIEVABLE PERCENTAGE OF

TEMPERATURE BATTERY'S RATED LIFETIME

20 °C 100 %
30 °C 50 %
40 °C 25 %

3.2.5 Powering-up the system

1. Refer to section ‎5 on page 41 for instructions on insertion of the power modules.
2. Attach the LCD display screen to the top front of the Centric. See section ‎7 on page 69 for
instructions on how to attach the LCD display screen.
3. Switch ON the external bypass input circuit breaker.
4. Switch ON the external rectifier input circuit breaker.
5. Switch ON the Centric LCD panel.
6. A series of screens are displayed on the control panel to enable you to define the system's
initial configuration. To perform the initial configuration, continue with section ‎3.3 below.
7. The Centric, with internal batteries, arrives with the battery fuses not installed and in a plastic
bag. (These are the fuses between the battery cabinet(s) and the Centric.) Insert the fuses in
the fuse holders, but leave the fuse holders open for now.

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3.3 Initial configuration

On the initial start up of the Centric, a series of configuration screens are presented on the display panel.
Through these screens you supply the Centric with required, basic configuration information to enable
initial operation of the Centric.
The initial configuration process is described here.

Figure 13: Initial configuration wizard, "Start" screen

1. On the "Start" screen, press "Next".

2. The password screen is displayed.
Enter the password provided by your distributor or sales agent and press “OK”.
Without such a password you cannot continue.

Figure 14: Initial configuration wizard: password entry

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3. On the next screen, indicate the number of battery sets connected to the UPS.
“Battery cabinet” here means “a set of 60 batteries” (“battery set”, for short). A battery set may be
housed in one or more physical cabinets. So if you have two cabinets of 30 batteries each, choose
“1” on this screen. If you have four cabinets of 30 batteries each, choose “2”.

Then press “Next”.

Figure 15: Initial configure wizard: number of battery sets

4. Indicate the capacity of the connected batteries in ampere/hours (Ah), then press "Next".
(This capacity figure is used by the UPS when in battery mode to calculate the amount of backup
time remaining.)

If you are not sure of your batteries’ Ah capacity, look at one of the batteries in the battery cabinet(s).
The Ah rating is usually indicated on the battery's exterior. The Ah rating of a single battery is the
same as for the entire cabinet. Enter this number in the wizard screen.

Figure 16: Initial configure wizard: battery capacity in Ah

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5. Scroll through the list to find your time zone, select the time zone, and then press "Next".

Figure 17: Initial configure wizard: set time zone

6. Press "Finish" to exit the wizard.

Figure 18: Finish configuration wizard

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3.3.1 Continuing first-time start-up process

1. Verify again that the batteries have been connected to the Centric with proper polarity.
2. If you are using lithium-ion batteries, check the values in the “Setup > Battery” parameters
against the information in the battery manufacturer’s data sheet. Verify that the parameter
values are appropriate for the batteries you have chosen.
3. Switch ON the battery cabinet circuit breaker, and/or close the fuse holders between the
battery cabinet(s).
4. On the Centric main menu, choose "Operation > Turn on/off > System on".
5. Return to the main menu by tapping on the "home" icon in the upper left corner of the
Centric screen.
6. On the main menu screen, if the alarm symbol (a yellow triangle) is displayed, press the
alarm symbol to display the potential problems. Refer to the troubleshooting section of this
document to determine the proper response to the alarm indications.

Figure 19: The "alarms" icon indicates alarm conditions

7. Perform a 5 minute battery test to verify that the Centric is ready and able to operate in
battery mode when needed. Verify that the ac output circuit breakers on the electrical board
are OFF. To perform a battery test, from the main menu choose:
"Operation > Battery test > Test battery", verify the duration is set to 5 minutes.
8. You can now connect a load device to the ac output, and then turn ON the ac output circuit
breakers on the electrical board.
9. Now you must update the last maintenance date. From the main menu, choose
"Setup > Time > Set last maintenance date". Tap on the line that says "Last maintenance
date". Press "confirm", and enter the system password if prompted for it.
10. Finally, to save the settings you have defined, from the main menu choose:
"Setup > Save and restore > Save settings > OK".

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3.3.2 Define the IP Address of Centric

This procedure assigns an IP address to the Centric. Assigning an IP address enables you, the user, to
remotely monitor the Centric over an IP network. If you do not intend to monitor the Centric remotely, this
step can be skipped. If you decide later to implement remote monitoring, you can perform this process at
that time.
The Centric supports use of a fixed IP address, and also supports dynamic assignment of IP addresses
(DHCP). Consult your IT systems administrator and determine if your IP network supports DHCP, and if
there is a preference for using either a fixed IP address or a dynamically assigned IP address for the
Centric.

To obtain an IP address automatically (your network must support DHCP):

1. From the Main Menu select Setup > Connectivity > Network Configuration.
2. Press the button labeled "Obtain an IP address automatically".
The Centric software obtains an IP address and then reboots itself.

To assign an IP address manually:

3. Press the button labeled "Use static IP address".
The IP definition screen is displayed

Figure 20: IP address configuration

4. You will have previously obtained from your network support personnel an IP address for the
Centric, as well as a subnet mask, a gateway address, a primary DNS address and a secondary
DNS address.
Enter these addresses now. To select an address field on the screen, press the field with your finger.
Use the virtual keyboard on the screen to enter the digits and dots that make up the address. Press
the "Confirm" key when you have finished entering all of the addresses. This causes the entered
addresses to be saved in the Centric's non-volatile memory.

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3.4 Testing
Perform the following tests on the Centric unit.

3.4.1 Blackout Test

This test is designed to verify the operation of Centric in the event of a blackout, when no ac power is
supplied to the UPS.
1. Turn all ac input to the system OFF (turn OFF the ac input switches to both Bypass and Rectifier).
2. Test the voltage at the system output between the phases and the neutral. It should be within the
specified range.

3.4.2 Test Under Load

This test is designed to verify the operation of Centric under load.
1. Connect an average or standard load to the system.
2. Measure the ac input voltage during operation under load. Take the measurements at the output
terminals of Centric (phase-to-phase between L1-L2, L2-L3, and L3-L1 and phase-to-neutral at L1,
L2, and L3). Phase-to-phase and phase-to neutral voltage should be not less that 2% below no-load
values.
3. Check and record the total system load (output current) and make sure that Centric is not
overloaded with respect to system specifications.
4. Verify that Centric is operating normally and that no alarms or fault indications are present.

3.4.3 Check IP Communication with Controller

This test is designed to verify that the System Controller is properly configured for communication and that
the Web server built into the System Controller is functioning properly. If you do not intend to use remote
monitoring of the UPS at this time you can skip this test.
The following procedure is given in general terms; the specifics will vary depending on the operating
system of the computer you are using.
1.Use an RJ45-to-RJ45 cable to attach a PC or laptop or other external computer to the Ethernet
(RJ45) port on the rear panel of the UPS’s system controller. (If using a straight cable jusmpers in
the system controller will need to be moved to support, the system uses a crossed cable as
default).

Configure the network connections of the external computer so that the computer is in the same
domain as the UPS – that is, so that the first three nodes of the computer’s IP address match the
first three nodes of the UPS’s IP address.

For example, if the UPS’s IP address is “192.212.118.100”, define your computer’s IP address as
“192.212.118.xxx”, where “xxx” is a number other than “100” in this case.

2.Define the subnet mask of your computer as “255.255.255.0”.

3.Open a browser on the external computer and enter the IP address of the UPS’s system
controller in the browser’s address field to verify that you can reach the Web server on the system
controller. You should see the UPS’s main menu.

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4. MISCELLANEOUS CONNECTIONS
Besides the main power terminals, there are a number of other connectors on the rear panel of the Centric.
These miscellaneous connectors are three locations, which we will refer to as connector groups 1, 2, and 3.
These connector groups are shown in Figure 21, and close-up views of the connectors are shown further
on in the text where relevant.

(200 kW model) (100 kW model)

(50 kW model)
Figure 21: Minor connector groupings on the Centric rear panel

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4.1.1 Input and output dry contacts

The Centric has input and output dry contacts.
The input dry contacts enable the Centric’s computer to monitor the state (open or closed) of a relay
external to the UPS, and to generate an alarm if the state of the external relay changes.
The output dry contacts enable the Centric to trigger an external circuit in response to a system alarm.
The connections for the input and output dry contacts are located on the rear of the UPS, on the external
surface of the UPS, in the connector groups labelled 1 and 2 in Figure 22
The dry contacts can be set up and configured at any time. Refer to the Centric User Guide for detailed
instructions on configuration of the dry contacts.

Figure 22: Closer view of dry contact terminals in connector group 1

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Figure 23: Close-up of connector group 2

Figure 24: Pin numbers in D9 connectors

Table 7: D9 pin assignments in connector group 2

PIN # ALARM CONNECTOR RS232 CONNECTOR RS485 CONNECTOR

1 Input dry contact #5 (AUX5) RXD, Receive data RTX-
2 Reserved TXD, Transmit data not used
3 Line failure (default; can be reassigned) not used RTX+
4 COMMON GND not used
5 Low battery (default; can be reassigned) not used not used
6-9 Remote panel not used not used

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Figure 25: Connections for EPO switch and battery trip coil
(Connector Group 3)

4.1.1.1 LOAD-ON-BYPASS DRY CONTACT

The Centric includes a dry contact (“Load on Bypass” dry contact) that closes when the Centric goes into
bypass mode. This can be used to trigger an external circuit, such as an audible or visual alarm.
The “Load on Bypass” dry contact is located on the rear of the Centric controller, in connector group 3
(see Figure 21, and item 3 in Figure 25). This dry contact is normally opened (N.O.), and has two pins. The
contact is voltage free; it can accept up to 24 Vdc 1 A.

4.1.2 Emergency Power Off – EPO (manual)

An external Emergency Power Off (EPO) switch may be installed on the Centric by the customer. The
EPO switch cuts power to the load in emergency situations.
The connection point for the EPO switch is a two-pin connector on the lower rear of the system (connector
group 3). See Figure 21, and item 1 in Figure 25. The EPO switch must be an N.O.-type, rated for at least
24 Vdc, 1 A. Be sure to perform a continuity test on the EPO switch before connecting it to the UPS.

4.1.2.1 BATTERY CIRCUIT BREAKER TRIPCOIL

The Centric includes a dry contact that closes when the EPO switch has been activated. This dry contact
can be connected to an optional trip coil on the battery box circuit breaker. This will cause the battery circuit
breaker to open when the EPO switch is activated.
The battery circuit breaker trip coil dry contact is located on the rear of the Centric controller, in connector
group 3 (see Figure 21), to the right of the EPO connector (see item 2 in Figure 25). It is labelled "Battery
CB trip coil". The dry contact is “normally opened” (N.O.), and has two pins. The contact is voltage free; it
can accept up to 230 Vdc 2 A.

4.1.2.2 RESTARTING THE UPS AFTER EPO

After the emergency situation that prompted use of the EPO switch has been resolved, the UPS can be
restarted as follows:
1. Reset the EPO switch.
2.Wait three minutes.
3.Switch off the following circuit breakers: ac input, bypass input, battery.
4.Switch on the same circuit breakers: ac input, bypass input, battery.
5.Switch on the UPS (“Operation > Turn on/off > System on”).

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4.1.3 LVD battery protector

The LVD battery protector is a mechanism that protects the batteries from deep discharge. You can read
about the LVD battery protector in the User Guide.
The Battery CB trip coil must have a tripping voltage of 24 Vdc to be supplied from the system. For any
other trip coil voltages the tripping voltage will have to be provided from an external source.
The following diagram shows how to wire UPS to enable the LVD battery protector. Wire should be 12AWG
2
or of a cross-section area 2.5 mm is recommended.
The system controller must also be configured to supply the configurable trip voltage:
1. Configure Input Dry Contact #3 to:
a. "Battery circuit breaker is off"
b. Normally closed
c. Enabled (mark with check mark)
d. Press confirm
2. Configure Output Dry Contacts #3 to:
a. LVD Battery Protector Active (mark with check mark)
b. Press confirm
3. Configure LVD battery protector
a. Enable LVD battery protector
b. Configure the desired time delay

Figure 26: LVD wiring diagram

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5. INSERTING AND REMOVING POWER MODULES

This chapter discusses the physical insertion and addition of modules to the system, the physical removal
of power modules from the system, and the related changes to the system configuration.
There are four basic operations that can be performed in this respect:
 First-time insertion of modules at time of system installation.
 Replacement of a module in an installed system.
 Addition of a module to an installed system.
 Removal of a module from an installed system.

Instructions for each type of operation are given below.

Generally speaking, if there are fewer than the maximum number of power modules in your system (8 for
the 200 kW system, 4 for the 100 kW system, 2 for the 50 kW system) the modules should be inserted in
the lower shelves and any empty shelves should be on top. This is for visual simplicity only and not
compulsory.
To perform any of the above four operations the controller must be in place and operating.

Warning: If you remove a UPS module from the Centric while the module is operating,
wait five minutes before reinserting the module. This allows the module’s capacitors
time to discharge.

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5.1 Insertion of power modules at system installation

When the installation instructions in section ‎3.2 call for it, do the following:
1.Verify the system controller is in place and is operating (CPU Active LED to the left of the LCD
screen is lit green), when the system is running. If the input breakers are off go to the next step.
2.Install the modules starting in the lowest available shelf and work your way upwards through the
available shelves.

For each module:

Push the module all the way into the module shelf. Push the module firmly to ensure proper seating
of the module’s rear connectors. Fasten the module to the UPS frame with two screws type M5
conical, one on the left and one on the right of the module face.

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200 kW model 100 kW model

50 kW model
Figure 27: Location of the UPS modules in the 200, 100, and 100 kW models

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5.2 Replacement of a module in an installed system

(The LCD screen images in this section are from a 200 kW system, and show eight modules.
The screen for a 100 kW system shows four modules. A 50 kW system will show two modules.)

To replace a module in an operational system:

1.Refer to section Insertion of power modules at system installation
2.From the system main menu, choose "Operation > Turn on/off > Modules off".
3.On the screen, choose the module to be replaced. The modules are numbered from bottom to
top. The outline of the module you choose becomes highlighted.

Figure 28: Turning off a module (200 kVA system)

4.Press the "Complete Shutdown" button.
5.To verify that the module has been shut down, navigate to the module status screen
("Main screen > Status > Modules"), press on the icon of the module you just shut down, and
verify that the status is "OFF" for these five items: PFC, Inverter, dc relay, Input relay, Output
relay (you may need to press the “page 2” button to see the status of the input, output and dc
relays).

Figure 29: "Status > Modules" screen

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6.Unscrew the two screws that secure the module in place – one screw on the left side, one on
the right side of the module’s front panel.
7.Remove the module entirely. (Before you take the module out of the shelf, have a place where
to lay it down after it is removed.)
8.Slide the replacement module all the way into the module shelf. Push the module inward gently
but firmly to ensure proper seating of the module’s rear connectors. Fasten the module to the
UPS frame with two screws type M5 conical, one on the left and one on the right of the module
face.
9.Navigate to "Status > Modules" and select the replacement module (the modules are numbered
from bottom to top). Then tap the Nominals button near the bottom of the screen, and verify that
the values for output voltage, output frequency, and frequency range match the system nominal
settings.
10.Navigate to "Operation > Turn on/off > Modules on". Select the module to be switched "ON"
and press "Confirm". (You may be prompted for the system password.)
11.To verify that the module is operating normally, navigate to the module status screen
("Main screen > Status > Modules"), press on the icon of the module that was just switched on,
and verify that the status is "ON" for these five items: PFC, Inverter, Dc relay, Input relay, Output
relay. Verify that the other fields are also normal (“in range” or “OK”).

Figure 30: Verifying status of replacement module

On the same screen ("Status > Modules"), press the Output button, select the replacement
module and verify that the output frequency matches the system nominal value, and that
the output voltage of each phase is within 2 % of the system nominal value.

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Figure 31: Status > Modules > Output

If the output voltage of one or more phases is not within 2 % of the system nominal output
voltage, transfer the system in to maintenance bypass, open the output breaker and then:
0.1 Shut down all other modules and Navigate to "Setup > Modules > Ac output voltage
adjustment".
0.2 Select the replacement module, and adjust the problematic phases up or down as
required.
0.3 Return to step 10 and repeat the verification and adjustment process until the output
voltage of each phase of the replacement module is within 2 % of the system
nominal value.
1.4 Turn on all modules and transfer back from maintenance bypass.
1.5 Navigate to the main menu screen. If the yellow, triangular alarm indicator is visible,
check the alarms and see if any of them are related to the new module. If there are
no related alarms, you have successfully replaced the module. You can now
resume normal use of the UPS

5.3 Addition of a module in an installed system

(The LCD screen images in this section are from a 200 kW system, and show eight modules.
The screen for a 100 kW system shows four modules. A 50 kW system will show two modules.)
To add an additional module to a power locked operational system:
The Centric controller can be locked to a lower than full power rating. In case the installer
locked the unit, the system controller must be informed that you are increasing the capacity
of your system. On the LCD control panel, from the main menu navigate to
"Setup > System > System type". Increase the maximum capacity of the system by 25 kW
times the number of modules added. For example, if you added one module to a 175 kW
system, you would choose 200 kW as the new system type (see Figure 32 and Figure 33).

A password is required to perform this function. If you do not have the required password,
contact your distributor or sales agent.

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Figure 32: “Model Type” screen for a 175 kW system

Figure 33: ”Model Type” screen for a 200 kW system

To add an additional module to an operational system:
1. The controller must be updated to the new total number of modules, and how many of them
(if any) are intended to provide redundancy. On the LCD control panel, navigate to
“Setup > System > Number of modules”. Increase the total number of modules as required,
and indicate how many of the modules are intended to provide redundancy. The Centric
User Guide provides more information on redundancy.

A password is required to perform this function. If you do not have the required password,
contact Gamatronic Support.

Figure 34: “Number of modules” screen

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2. Veify that the address of the empty shelf is not available.

5. Insert the new module part way.
Note: The numbering of the shelves are from bottom to top.

6.Slide the module all the way into the module shelf. Push the module inward gently but firmly to
ensure proper seating of the module’s rear connectors. Fasten the module to the UPS frame with
two screws type M5 conical, one on the left and one on the right of the module face. Verify that
the new module address is the number shelf where inserted.
7.Navigate to "Status > Modules" and select the new module. (The modules are numbered from
bottom to top). Then tap the Nominals button near the bottom of the screen, and verify that the
values for output voltage, output frequency, and frequency range match the system nominal
settings.
8. If the module was perviously shut down, navigate to "Operation > Turn on/off > Modules on".
Select the replacement module and press Confirm. (You may be prompted for the system
password.)
9.To verify that the new module is operating normally, navigate to the module status screen
("Main screen > Status > Modules"), press on the icon of the module that was just switched on,
and verify that the status is "ON" for these five items: PFC, Inverter, Dc relay, Input relay, Output
relay. Verify that the other fields are also normal.

Figure 35: Verifying status of added module

10. On the same screen ("Status > Modules"), press the Output button, select the new module
and verify that the output frequency matches the system nominal value, and that the output
voltage of each phase is within 2 % of the system nominal value.

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Figure 36: Status > Modules > Output

If the output voltage of one or more phases is not within 2 % of the system nominal output
voltage, transfer the system in to maintenance bypass, open the output breaker and then:
2.1 Navigate to "Setup > Modules > Ac output voltage adjustment".
2.2 Select the new module, and adjust the problematic phases up or down as required.
2.3 Repeat the verification and adjustment process until the output voltage of each
phase of the replacement module is within 2% of the system nominal value.
12.4 Turn on all modules and transfer back from maintenance bypass.
12.5 Navigate to the main menu screen. If the yellow, triangular alarm indicator is
visible, check the alarms and see if any of them are related to the new module. If
there are no related alarms, you have successfully replaced the module. You can
now resume normal use of the UPS

5.4 Removing a module from an installed system

(The LCD screen images in this section are from a 200 kW system, and show eight modules.
The screen for a 100 kW system shows four modules. A 50 kW system will show two modules.)
To remove a module in an operational system:
1. The system controller must be updated to the new total number of modules, and how
many of them (if any) are intended to provide redundancy.
2. On the LCD control panel, navigate to
“Setup > System > Number of modules”. Decrease the total number of modules as
required, and indicate how many of the modules are intended to provide redundancy.
The Centric User Guide provides more information on redundancy.

A password is required to perform this function. If you do not have the required
password, contact your distributor or sales agent.

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Figure 37: “Number of modules” screen

3. From the system main menu, choose "Operation > Turn on/off > Modules off".
4. On the screen, choose the module to be removed. The modules are numbered from bottom
to top. The outline of the module you choose becomes highlighted.

Figure 38: Turning off a module

5. Press the "Complete Shutdown" button.
6. To verify that the module has been shut down, navigate to the module status screen
("Main screen > Status > Modules"), press on the icon of the module you just shut down,
and verify that the status is "OFF" for these five items: PFC, Inverter, Dc relay, Input relay,
Output relay.

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Figure 39: "Status > Modules" screen

7. Verify that the load level is evenly split between the remaining modules.
8. Unscrew the two screws that secure the module – one on the left side, one on the right side
of the front panel.
9. Slide the power module out of the shelf and place it down on the table you reserved for it.
10. Navigate to the main menu screen. If the yellow, triangular "alarm" indicator is visible,
check the alarms and see if any of them are related to the removal of the module. If there
are no related alarms, the module has been successfully removed from the system. You
can now resume normal use of the UPS.

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6. PARALLEL OPERATION
6.1 Theory
When two or more Centric units are deployed in parallel, they are connected according to the decentralized
static switch method (see below). Special technical solutions and control algorithms are implemented to
synchronize all units in the system to prevent circulation of energy between them and to isolate a faulty unit
from the common power bus. In addition, an active current sharing circuit regulates the output voltage of
each UPS to provide optimal load sharing between the units.
One of the parallel UPS systems assumes the role of “Master”. This unit is synchronized to the mains
power. The other units operate as “Slaves” and are synchronized to the Master. (The function of Master is
assumed by the first system to be switched on during the parallel start-up process. This is transparent to
the system operator.)

6.1.1 Decentralized static switch method

Every Centric UPS is equipped with a static switch to ensure that the UPS will continue to supply power to
the load (from the mains or from a secondary ac input source) in the event of a problem with the inverter or
an overload of the UPS. Thus, the static switch performs a very important function.

Figure 40: The static switch in context (stand-alone system)

However, when two or more UPSs are configured in parallel mode, the static switch presents a potential
problem in that, were one UPS to fail, its static switch would automatically be triggered to go to bypass
mode, to supply the load directly from the mains. This would connect the inverters of the other UPSs
directly to the mains (through the output bus), which could potentially damage them.
To avoid such a hazard in decentralized mode, the static switches are synchronized by dedicated control
communication to ensure that if one unit goes to bypass mode, the rest of the units will also transfer to
bypass mode simultaneously.

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6.1.2 Parallel communication

When two or more Centric units are operated in parallel, parallel communication must take place between
them in a "ring" arrangement. This is accomplished by the use of Gamatronic-provided cables with D-15
connectors on each end. Parallel communication keeps the parallel units synchronized with each nother,
and is used to pass commands and status information between units.
Each Centric UPS has two D-15 parallel communication connection terminals.
Figure 41shows how to connect the parallel communication terminals for parallel operation of two and three
Centric units. Be aware that when connecting one UPS to the other, it does not matter which of the two D15
terminals you use on each UPS.

Figure 41: Parallel comm. connections (cable cat.no. GPIN15350)

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6.1.3 Current sharing

Warning: the four-wire current-sharing cable is for units that are using older (rev. 2) power
modules only. If your system is using only rev.4 power modules, skip this section.

When two or more Centric units are operated in parallel, it is required that their current-sharing terminals be
connected together: yellow to yellow, orange to orange, red to red, and blue to blue. Connecting two or
more Centric units via their current-sharing terminals causes current-sharing to be take place between all
the modules of both systems together.
When three or more Centric units are operated in parallel, their current-sharing terminals should be
connected together as shown in Figure 42; for example:
 Connect the current-sharing terminals on UPS "X" to those on UPS "Y", AND
 Connect the current-sharing terminals on UPS "Y" to those on UPS "Z".
The parallel cable kit, supplied by Gamatronic, includes a prepared current sharing cable or cables.

Figure 42: Conceptual view of current sharing connections for 3 UPSs

Figure 43: Conceptual view of current sharing connections for 4 UPSs

When connecting current-sharing terminals, it is irrelevant which UPS is the "master" UPS and which are
the "slaves".

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Figure 44: Conceptual summary of special cabling for parallel operation

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The parallel UPSs must be connected to one another via their current sharing terminals (see
Figure 25), using the current sharing cable supplied in the cable kit (see Figure 45). The kit
includes cables for current sharing between two, three or four Centric units in parallel.

Figure 45: Current-sharing cable

6.1.4 EPO and parallel operation

An EPO switch can also be used if you intend to operate multiple Centric units in parallel. An external n-
pole / N.O. EPO switch may be connected according to the connection schematic. EPO disconnection of
the parallel units MUST BE SIMULTANEOUS! EPO wiring and switch rating must be 5 A / 230 Vac.

6.1.5 Manual bypass and parallel operation

A manual bypass switch can also be used if you intend to operate multiple Centric units in parallel. An
external n-pole / N.O. switch may be connected according to the connection schematic. Manual bypass
transfer of the parallel units MUST BE SIMULTANEOUS!

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6.2 Instructions for parallel configuration

In the event that the customer desires to install two or more UPS systems in a parallel
configuration:
● Gamatronic's prior approval of the details of the installation and configuration is
required. Including approval of the parties participating in the commissioning and
deployment of the UPS is required.

For parallel configurations of two or more Centric UPSs, the following important information applies:
● The sum of the length of the bypass input and output cables must be the same on all of the UPSs and
must be at least 10 meters long.
● The number of power modules in each UPS must be the same (±1 module).
● If one or more of the UPSs gets switched off (whether manually or automatically), the output circuit
breaker of each "off" UPSs must be switched off by the user, to avoid a forced transfer to bypass of the
remaining UPSs, and errors in the computation of load sharing.

Figure 46: Cable lengths in a parallel configuration

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When reading this section, refer also to the appropriate connection diagram
1.The Centric units should be located near to one another. They must be connected to one
another in a ring configuration using the parallel communication cables supplied in the cable kit.
Table 8: Cable sets for parallel configurations

Description of cable set Catalog No.

Set of cables for 2 parallel units 101-CN-SKD-P

Set of cables for 3 parallel units 101-CN-SKD-P-1

Set of cables for 4 parallel units 101-CN-SKD-P-2

The supplied cables allow for a maximum of about 5 meters between UPSs. Keep this in mind
when positioning the UPSs.
2.In a parallel configuration, the length of the bypass input cable must be the same on all of the
UPSs, and the bypass input cables must be at least 10 meters in length.
3.In each of the Centric units that are to be connected in parallel, the jumper labeled “J5 master”
must be removed from circuit board PC3001, a long, narrow, “L”-shaped board located at the left
rear of the Centric.

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Figure 47: Rear of the Centric, showing the Figure 48: Closeup of the master jumper
PC3001 circuit board

4.Connect the UPSs in a ring configuration via the two 15-pin parallel communication terminals
on each UPS. Use the supplied cables. See Figure 21, Figure 25

Figure 49: Parallel communication cable with 15-pin connectors

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5.Verify that each UPS’s output circuit breaker is in the OFF position (CB5 in the connection
diagram).
6.Turn on one of the systems. This system will become the “master” system. Wait until the
automatic startup procedure is complete – you will see the main menu screen. It should read
“UPS ON, Normal mode”, and there should be no alarms present. (If there are active alarms,
resolve any problems before continuing.)

Figure 50: The main menu screen

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7.Put the UPS in multisystem mode:

Main menu > Setup > System > Multisystem mode.
(In the event that this option is blocked, consult Gamatronic Support or your distributor to obtain
the needed password.)
8.Now turn on the other parallel system or systems. These will be the slave systems.

You can have up to four systems in a parallel configuration. Once the master system has
completed the start-up process (step 6 above), the remaining systems (slave systems) can be
switched on together. Wait until they finish start-up and verify that each system is in “Normal”
mode and has no active alarms.
9.Put the slave systems in multisystem mode (Main menu > Setup > System > Multisystem
mode).
10. For each slave system, compare the output voltage of each phase to that of the master
system. Any voltage difference should be no greater than 2 Vac. If the difference in output voltage
is greater than 2 V for any phase, navigate to the “Main Menu > Status” screen, tap the “Modules”
icon, and then tap the “output” button at the bottom of the page.
You will see the ac output voltage display, per module. By tapping on each of the module icons
on the left side of the screen you can see which modules have an output voltage that is more than
±2 V different from the master system.

Figure 51: Ac output voltage display, per module

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For each module with an “out of range” output voltage, note which module it is, which phase or
phases are out of range, and what the voltage is. The system must disconnceted from all others
and the modules in the unit must be shut down. Once the module that has a variant outputvoltage
is found, Then, navigate to
“Main menu > Setup > Modules > Ac output voltage adjustment”
and change the output voltage for the problematic module phase. Repat this for each phase and
module until the full system is able to supply the desired output voltage.
11.When you have verified that all of the slave systems have output voltages within ±2 V of the
master system, put each system in bypass mode
(Main menu > Operation > Transfer > Transfer load to bypass).
12.For each slave system, compare the output voltage of each phase to that of the master
system, as you did above, except that now the systems are in bypass mode. Any voltage
difference should be no greater than 2 Vac.
13.Return all of the systems to bypass mode.
14.Move the output circuit breaker of each UPS to the ON position. (CB5 in the connection
diagrams).
15.Compare the output current from each pair of systems. Under full load, the difference in output
current between any two systems should not exceed ±10 % of the total system output current.
16.The parallel systems are now ready for use for any loads up to the maximum rated output in
kW of the combined systems.
17. Transfer to inverter.

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Figure 52: Connection diagram for two parallel Centric units

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Figure 53: Connection diagram for three parallel Centric units

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6.3 Replacing a UPS in a parallel configuration

When replacing a UPS that is in a parallel configuration, the parallel units can be either kept on inverter or
placed in maintenance bypass depending on the total load level they are supporting.

To keep the load running in inverter load, the remaining units in the parallel configuration must have
enough vertical redundancy to support the additional load of the UPS that needs to be serviced. This can
be done by simply disconnecting the input, output and battery circuit breakers of the single UPS that needs
to be serviced. The other units powering the load will evenly distribute the remaining load between the
power modules across each UPS. This enables a technician, after turning off ALL the input, output and
battery circuit breakers, to work safely on the UPS. The technician can perform full maintenance
procedures, load testing and even replace the unit without any interruption of power to the load.

If the remaining units are not able to support the additional load level or the units are running with a
common battery, the entire parallel configuration will have to be put into maintenance bypass mode (skip to
section 6.3.2). When in maintenance bypass mode the units do not supply power to the load, and UPSs
can be isolated from the mains power. This enables a technician, after turning off ALL the input, output and
battery circuit breakers, to work safely on the UPS. The technician can perform full maintenance
procedures, load testing and even replace the unit without any interruption of power to the load. This mode
of operation is also commonly referred to as "wrap around maintenance bypass".

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Warning:
If using a shared battery, simply disconnecting the battery breakers to a single unit will not
disconnect the dc voltage from the battery terminals. Dc voltage will be supplied for the
other modules. To safely disconnect a single unit the full parallel configuration must be put
in to maintenance bypass and all input, output and battery circuit breakers be opened

6.3.1 Shutting down one unit in a parallel configuration

Shutting down one UPS unit in a parallel configuration, with redundancy to handle the full load

1. Verify that each system has 2 parallel communication cables and they are all connected in a ring
configuration. (If this is not in place you risk dropping the load)
2. On the system controller select SYSTEM OFF on the unit to be replaced.
(This will evenly rout the load supported by the UPS to the remaining UPSs in the parallel
configuration)
3. Switch OFF the output circuit breaker of the unit to be replaced.
4. Switch OFF the input and bypass circuit breakers of the unit to be replaced.
5. Switch OFF the dc (battery) circuit breaker of the unit to be replaced.
6. Disconnect the UPS from the EPO cables.
7. Disconnect the UPS from the Forced Bypass cable
8. Disconnect the UPS from the parallel cables.

Table 9: CB settings for safe removal of the unit

Battery box Rectifier ac Bypass ac UPS ac
input input input output
(on battery box) (C.B. 2) (C.B. 3) (C.B. 5)

OFF OFF OFF OFF

9. Disconnect the UPS from all wiring.
10. Move the new UPS into place, rewire the new system according to figure 55.
11. Attach the EPO cable to the new system.
12. Turn on the rectifier and bypass input circuit breakers.
13. Verify the proper nominal settings are the same as the other units in the parallel configuration.
14. Set the new system to "multi-system".
15. Verity proper phase order on the new system.
16. Switch OFF the new system.
Note: if there is a mains failure during this time the remaining batteries may have a lower
backup time.
Note: if one of the systems in the parallel configuration transfers to bypass, all the other
systems will as well.
17. Attach the communication cables to the new system.
18. Switch ON the new system.
Note: The remaining parallel units may transfer to bypass until the new system modules are
ready to share the load.
19. Check again for proper phase order on the new system on all input and output breakers.
Note if there is a greater than 5V difference on any phase adjust the output of each module.
20. Switch ON the output CB of the new system.
21. Check master and check output voltages again.
22. Transfer all units to inverter mode if needed.

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6.3.2 Transferring the UPS to maintenance bypass mode

Warning: Gamatronic requires C.B. 6 (the maintenance bypass switch) to have a normally
open auxiliary contact that are wired to the FORCED BYPASS terminals. This is to ensure
that the system is on bypass during the transfer.

In normal operation, the UPS's ac circuit breakers are positioned as shown in Figure 1, Table 10
See Figure 1 for C.B. locations)
Table 10: Normal Mode CB Configuration
Battery box input Rectifier ac Bypass ac UPS AC output Maintenance bypass
(on battery box) input input (C.B. 5) (C.B. 6)
(C.B. 2) (C.B. 3)

ON ON ON ON OFF

To put the system in maintenance bypass mode:

1. Verify with a multi-meter on C.B.6 that there is no voltage difference between the input and output of
each phase.
Note: If there is there is a bad phase rotation either on the input of the system or on the maintenance
bypass CBs 4 and/or 6. This will have to be corrected before the system can be put in maintenance
bypass. DO NOT CLOSE CB 4 OR 6, THIS WILL CAUSE A SHORT BETWEEN PHASES.
2. Verify that all three phases of the bypass input voltages are present and the inverter and bypass are
synchronized on the system controller status screen. (If they are not, the UPS cannot transfer to
bypass mode.)
3. On the system controller LCD screen press operations> transfer load to bypass.
4. Verify that the load is being supported by the bypass one the Status screen of all systems.
Then, operate the UPS's ac circuit breakers as follows:
5. Switch ON the MAINTENANCE BYPASS circuit breaker.
6. Switch OFF the AC OUTPUT circuit breaker.
7. Switch OFF the RECTIFIER AC INPUT circuit breaker.
8. Switch OFF the BYPASS AC INPUT circuit breaker.
9. Switch OFF the BATTERY INPUT circuit breaker.

Table 10 Position of the CBs in maintenance bypass mode

Battery box input Rectifier ac Bypass ac UPS AC output
Maintenance bypass
(on battery box) input input
(C.B. 6)
(C.B. 2) (C.B. 3) (C.B. 5)
OFF OFF OFF OFF ON

Verify 0V across all terminals in the system. The system is now in maintenance bypass mode and can now
be safely serviced.

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6.3.3 Returning the UPS back to normal mode from maintenance

bypass mode
Table 11: Maintenance Bypass Mode CB Configuration
Battery box Rectifier ac Bypass ac UPS AC Maintenance bypass
input input input output (C.B. 6)
(on battery box) (C.B. 2) (C.B. 3) (C.B. 5)
OFF OFF OFF OFF ON

To put the system in normal mode (inverter mode), perform the

following operations:
In maintenance bypass operation, the UPS's ac circuit breakers are positioned as shown in

(see Figure 1 for C.B. locations).

1. Switch ON the RECTIFIER AC INPUT circuit breaker.

2. Switch ON the BATTERY circuit breaker.
3. Switch ON the BYPASS AC INPUT circuit breaker.
4. Switch ON the UPS (Operation>system on). Wait for the system to automatically transfer to inverter
once all the power modules are operational.
5. On the system controller LCD screen press operations> transfer load to bypass.
6. Verify that the bypass indicator is lit on the controller.
7. Switch ON the AC OUTPUT circuit breaker.
8. Switch OFF the MAINTENANCE BYPASS circuit breaker.
9. On the system controller LCD screen press operations> transfer load to inverter.
10. Verify that the load is being supported by the inverters on the Status screen.

The switches are now positioned as shown in Table 12.

Table 12: Position of the CBs in normal mode

Battery box Rectifier ac Bypass ac UPS ac
Maintenance bypass
input input input output
(C.B. 6)
(on battery box) (C.B. 2) (C.B. 3) (C.B. 5)
ON ON ON ON OFF

The system is now in normal mode (inverter mode) and is now supporting the load.

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7. FALLBACK PUSH-BUTTON CONTROL PANEL

In the unlikely event that the LCD display panel stops functioning due to damage or some other reason, it is
still possible to operate the Centric through a push-button control panel located on the Centric’s lower front
panel. See Figure 54.

Figure 54: Location of fallback push-button control panel

The push-button panel provides only the most basic functionality.
1. When the Centric is OFF, pressing the "Enable" button turns the Centric ON.
(The button is recessed to prevent accidental use.)
2. The "Inv/Byp" button toggles the load from bypass to the inverter and from the inverter to bypass.
To reiterate, the fall back control panel is intended for use only when the LCD screen is not functional.

Figure 55: Close-up of the push-button control panel

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8. CIRCUIT BREAKER SELECTIVITY

When discussing power distribution, " selectivity " (also referred to as “discrimination”) is the selection and
arrangement of circuit breakers such that in the event of a short circuit or overload in the line, the circuit
breaker closest to the short will be tripped and the upstream circuit breakers remain unaffected.
In a UPS, the electrical circuit of the bypass ac input line includes the main circuit breaker feeding the UPS
and the circuit breaker distributing power to the load.
The UPS load is normally fed from the UPS's inverter. When a short circuit occurs, the UPS detects the
short circuit and switches the load to the bypass line. During the short circuit, the current flows through the
bypass line's main circuit breaker and continues through the other circuit breakers in series to the load that
is the source of the short circuit.
A problem that can arise in such a situation is how to prevent the main circuit breaker from tripping before
the downstream circuit breaker closest to the load is tripped.
As an example, Figure 56 shows a typical UPS feeding a number of loads. When a short circuit occurs in
Load 2, the system switches the load to the bypass line. In the example, the bypass line includes CB01,
CB03, and CB05. The problem is how to prevent CB01 and CB03 from tripping open before CB05 trips
open.

Figure 56: A UPS's bypass circuit

Selection of circuit breakers to achieve discrimination involves the consideration of two factors: thermal
tripping and magnetic tripping. Circuit breakers can have one or both of these tripping characteristics.
Magnetic tripping is activated immediately when the current though the circuit breaker exceeds a specific
limit. Magnetic tripping can include a deliberate delay, depending on the design of the specific circuit
breaker chosen.
Thermal tripping responds, with a delay, to lower-level, longer-term current excesses. Thermal tripping can
be useful on circuits that are subject to expected short-term current overload, such as when a load with
high-inrush current is turned on. In such a case you would only want the circuit breaker to trip if the current
overload continued for an abnormal length of time.
Using Figure 56 as an example, optimal discrimination of circuit breakers in series can be achieved by
choosing them in such a way that when a short circuit occurs, the response of circuit breaker feeding the
bypass line (CB01) line will be based on thermal (slower-acting) tripping, while the circuit breaker closest to
the short circuit (CB05) will respond based on magnetic (instantaneous) tripping. In most cases we would
want the intermediate circuit breaker (CB03) to respond thermally to a short in Load 2, but with a shorter
delay than that of CB01.
See Table 2 for maximum rectifier input current values and maximum bypass input current values.
See Table 3 for recommended circuit breaker ratings.
In order to protect the UPS's bypass contactor and also the main input of the UPS, for all scenarios
including short circuit, Gamatronic recommends the following:
 The circuit breaker that feeds the bypass input line and the circuit breaker feeding the main input of
UPS shall have no magnetic protection delay, or a maximum magnetic protection delay of 50 msec.

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This ensures that the circuit breaker will interrupt the short circuit before any damage can be done
to the static switch contactor and the UPS modules.
 If you choose to use a time-delay circuit breaker on the bypass input line, recommended
rating of the breaker is approximately six times the maximum bypass input current.
 When using a circuit breaker with delayed magnetic protection, the ability of the cables and the rest
of the infrastructure to withstand a short circuit must be taken in account.

Where the local electrical code is more stringent than the above recommendations, the local code
takes priority.

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9. USING THE UPS WITH A GENERATOR

9.1 The Automatic Transfer Switch (ATS)
At many sites a generator is used as a reserve source for feeding the UPS during mains power failure. In
such cases, the switching between the two sources (the mains and the generator) is performed by an
Automatic Transfer Switch (ATS). Because these two sources are not usually synchronized, switching
between them requires an interval of at least 10 seconds.

Figure 57 illustrates the timing factors involved when using an ATS. For proper functioning of the UPS, the
values used for T3 and T4 must be greater than 10 seconds. The optimum delay times can be revealed
with a little testing, and may vary from site to site, depending on the UPS, on the loads, and on the
particular ATS being used.

Figure 57: Timing variables when using a generator and an ATS

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Figure 58 is an example of the control panel of an ATS.

The upper part of the control panel consists of a mimic

diagram showing the control flow.

“NS = 0” means the normal source is not available.

“NS = 1” means the normal source is available.
“R” is the reserve source.

The timing variables T1 through T5 are described in Figure

57.

The knob at the bottom of the control panel controls the

actions of the ATS:
● The ATS can be set to use the normal source.
● The ATS can be set to use the reserve source.
● The ATS can be set to automatic mode, which will use
the normal source and will automatically switch to the
reserve source in the event of a failure of the normal
source.
● The “Stop” setting opens the ATS’s circuit breakers.

Figure 58: Example of an ATS control

panel

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10. PERIODIC PREVENTIVE MAINTENANCE

Technologically advanced electronic systems are the heart of every Gamatronic UPS. These electronic
systems are sensitive to environmental conditions. It is important that the operating and storage
environments of the UPS be clean and dust-free, free of dampness and excess humidity.
The system's batteries provide back-up power to the UPS when needed. An environmental temperature of
25 °C (77 °F) is ideal for the batteries. Significantly higher temperatures shorten the batteries' lifespan.
The UPS and its batteries both require periodic preventive maintenance inspections. At the least, these
inspections should include a visual inspection of the UPS and its batteries, and the tightening of any screws
and bolts that have over time become loosened. The owner of the UPS is responsible for ensuring that the
preventive maintenance inspections take place. This is done by contacting Gamatronic's service
department and arranging a mutually convenient time for a technician to perform the inspection.
It is important that the UPS owner continue to arrange regular preventive maintenance inspections even
after the expiration of the initial warranty period.
Gamatronic bears no liability for damage caused to the UPS due to improper maintenance by third parties,
in particular after the expiration of the warranty or service agreement.
It is the responsibility of the UPS owner to uphold his responsibilities according to the warranty or service
agreement. This includes ensuring that the UPS's environment meets requirements.

These preventive maintenance procedures shall be performed only by a

trained and qualified technician!

10.1 Objectives
Periodic preventive maintenance is performed on the Centric to verify that the UPS and its batteries are in
proper electrical and physical condition
It is recommended that preventive maintenance checks be performed every three to six months, or in any
case at least once annually.

10.2 Recommended Tools

Before proceeding with the periodic maintenance make sure that the following tools are available to you:
 Philips screw driver
 Flat head screw driver
 Oscilloscope
 Multi-meter
 Air compressor or vacuum (for cleaning)
 Flashlight

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10.3 Maintenance Procedures and Report

Record the values of all parameters checked and of measurements taken during the periodic maintenance
in the form below. Once complete send to support@gamatronic.com.

1. UPS model and configuration

Company ______________________ Address _______________________________________
_______________________________ _______________________________________________
Site ___________________________ Phone ________________ E-mail _________________

Centric ____________________ kW No. of UPS modules: _____ No. of redundant UPS modules,
if any: _______
Type of maintenance: [ ] Annual [ ] Semi-annual [ ] Quarterly
System S/N (found on external sticker-label): ______________________________________
Technician Name _______________ Date Signature
_______________________________ ___________________ ___________________________

2. Visual Inspection of cabinet

OK [ ] Not OK [ ] Comments ________________________________________________________
3 . E n vi r o n m e n t a l I n s p e c t i o n
Environmental
________°C
temperature
Ventilation [ ] OK [ ] Not OK
Air conditioning [ ] Yes [ ] No
Comments _________________________________________________________________________________
4. Displa y Panels
LCD Display [ ] OK [ ] Not OK Comments ____________________________
LEDs [ ] OK [ ] Not OK Comments ____________________________
5. Voltages
Verify that displayed dc voltages, rectifier input voltages, and inverter output voltages are showing proper values.
Verify the readings for the UPS as a whole
(“Menu option 1, System”, or on touch screen “Main menu >Status”)
and for each module
(“Menu option 2, UPS Module” or on touch screen “Main menu > Status > Modules”).
Dc voltages (+)_______________ (-)_______________ (Total)_______________
Rectifier input Volts: __________ __________ __________
voltages Amperes: __________ __________ __________
Hertz: __________
Inverter output Volts: __________ __________ __________
voltages Amperes: __________ __________ __________
Hertz: __________
6. Serial Number / Clock and Calendar
 Done Verify that the UPS’s clock and calendar show the correct date and time.
If either the date or time are incorrect, enter the correct information and save.

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7 . Al a r m s
Use Alarm Log to display the alarms. List the names of any active alarms: ___________________
___________________ ___________________ ___________________ ___________________ __________
List the names of recent alarms: ___________________ ___________________ ___________________
___________________ ___________________ ___________________ ___________________

8 . B yp a s s T e s t a n d M o d u l e M a i n t e n a n c e
Connect an oscilloscope to UPS output terminals L1 and N. Press the BYPASS button to put the UPS in bypass mode.
Verify that the transfer takes place normally, with no interruption of power to the load.
[ ] OK [ ] Not OK Comments ____________________________________________________
9. Check Front and Rear Fans
Use a flashlight to visually verify that the front fans and rear fans in each module are operating.
Front fans [ ] OK [ ] Not OK Comments ____________________________
Rear fans [ ] OK [ ] Not OK Comments ____________________________
10. Clean the Fans and the Fan Grilles
 Done Examine and clean the fans and the fans’ protective coverings of each module, from the
outside, using a vacuum cleaner or an air compressor.
11. UPS Voltage Measurements
Th e f o l l o wi n g m e a s u r e m e n t s m u s t b e p e r f o r m e d w h e n t h e U P S i s u n l o a d e d o r i s c o n n e c t e d t o a
constant, stable load.

Measured value: ____ Measure the voltage between Neutral and Ground at the bypass input. The value should be
Vac no greater than 2 Vac.

Use a calibrated voltmeter to measure the rectifier input voltages. Record the readings in the table below. Compare
your readings with the console display of the rectifier input voltage. If the readings differ, the UPS’s input voltage
measurement may require calibration (“Setup > Module config. > AC CALIBRATION”, or on touch screen “Main menu > Setup >
Modules > AC INPUT VOLTAGE CALIBRATION”).

Voltmeter Console Readings match?

Location Phases
reading reading YES NO
L1 – N
Rectifier input L2 – N
L3 – N

Use a calibrated voltmeter to measure the inverter output voltages according to the table below. Compare your readings
with the console display of the inverter input voltage. If the readings differ, the UPS’s output voltage measurement may
require calibration (“Setup > Module config. > AC CALIBRATION”, or on touch screen “Main menu > Setup > Modules > AC OUTPUT
VOLTAGE CALIBRATION”).
L1 – N
Inverter output L2 – N
L3 – N

12. Input Isolation transformer

For UPS’s with an input isolation transformer: does the output of YES NO
each transformer phase within the expected range?
Perform a visual inspection of the interior and exterior of the input DONE
transformer.
Comments:

13. Output Isolation transformer

For UPS’s with an output isolation transformer: does the output of YES NO
each transformer phase within the expected range?
Perform a visual inspection of the interior and exterior of the input DONE
transformer.
Comments:

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 GAMATRONIC, A SOLAREDGE DIVISION

14. Battery Checks

Turn the battery circuit breaker to Off and disconnect all connectors in the battery set.
Record the requested information in the following table.

Number of battery strings

Battery manufacturer Battery model Rating (Ah)
(x 60)

CAUTION: RISK OF EXPLOSION IF A BATTERY IS REPLACED BY AN INCORRECT

TYPE.
DO NOT DISPOSE OF BATTERIES IN A FIRE. BATTERIES MAY EXPLODE.
DO NOT DISCARD BATTERIES IN THE TRASH. THIS PRODUCT CONTAINS SEALED
LEAD-ACID BATTERIES.
FOR PROPER DISPOSAL, CONTACT YOUR LOCAL RECYCLING OR HAZARDOUS
WASTE CENTER.

Use a power resistor of 0.5 Ω (300 W rating recommended) for the load to check the voltage drop
across the terminals of each battery. The voltage measured across the resistor should be no less
than 10 Vdc for any battery. Replace any batteries that give a reading less than 10 Vdc.

BATTERY STRING #1 BATTERY STRING #2

Batt. Batt. Batt. Batt.
Good Bad Good Bad Good Bad Good Bad
no. no. no. no.
1 31 1 31
2 32 2 32
3 33 3 33
4 34 4 34
5 35 5 35
6 36 6 36
7 37 7 37
8 38 8 38
9 39 9 39
10 40 10 40
11 41 11 41
12 42 12 42
13 43 13 43
14 44 14 44
15 45 15 45
16 46 16 46
17 47 17 47
18 48 18 48
19 49 19 49
20 50 20 50
21 51 21 51
22 52 22 52
23 53 23 53
24 54 24 54
25 55 25 55
26 56 26 56
27 57 27 57
28 58 28 58
29 59 29 59
30 60 30 60

END OF MAINTENANCE PROCEDURES REPORT

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 GAMATRONIC, A SOLAREDGE DIVISION

11. SERVICE AND REPAIRS

Gamatronic maintains a team of service technicians, repair laboratories, and an ample inventory of spare
parts, dedicated to the service and repair of our products. When service is required, it will be performed
either at the customer's site or in one of our laboratories, according to the judgment of our technician and
the specifics of the service agreement between the customer and Gamatronic.
In regards to service, oral agreements have no standing. Service shall be provided gratis during the
warrantee period, on the condition that the UPS has been properly maintained and a written record has
been kept of any maintenance performed on the system.
The initial warrantee period can be extended by a written service agreement between Gamatronic and the
customer. Without a written agreement, Gamatronic is under no obligation to provide service after
expiration of the initial warrantee period.
Gamatronic will not be responsible for maintenance or changes to the UPS that are performed by an agent
without written authorization from Gamatronic.

SolarEdge provides design, development, production, sales and services of solar power electronics,
monitoring systems, UPS, power supplies, voltage/supply stabilizers and power converters, for the general
and solar photovoltaic markets.

© SolarEdge Technologies, Inc. All rights reserved. SOLAREDGE, the SolarEdge logo, OPTIMIZED BY
SOLAREDGE are trademarks or registered trademarks of SolarEdge Technologies Inc. All other
trademarks mentioned herein are trademarks of their respective owners. Date:03/2019/V3.9/ENG NA.
Subject to change without notice.

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 GAMATRONIC, A SOLAREDGE DIVISION

Release 0.0, August 2013

Took regular Mega 250 book and converted it into Centric book, as follows
1 Modified cat.no. on front page, modified product name on front page and in page footers.
2 Modified product name throughout book.
Updated technical specifications:
dc link voltage now ±320 to ±405,
3
number of batteries now 60,
module now 33 kg.
4 Modified connection diagrams (Figures 3 & 4) to show groups of 30 batteries and the new product name.
5. Modified battery connection diagram (Figures 5) to show groups of 30 batteries.
6 In installation checklist, change dc voltage references to 360 V (were 384 V).
7 In detailled installation instructions, changed dc voltage references to 360 V (were 384 V).
8 Updated values in “Clearances” table (Table 1, page 4) and added clearance diagram (Figure 1, page 4).
9 Updated Figure 6 (Alternate battery connection option) as per Z.K.
10 All descriptions of the system’s physical design and layout were modified as appropriate.
11 Updated the connection diagrams (regular and with input isolation transformer).
Release 0.1, 1 October 2013
1 Eliminated “Replacing the computer” chapter until further information will be available.
Release 0.2, 2013.10.28
Updated Figure 20 (Connector group 1 / dry contacts) – the layout is reversed from other UPS models,
1
flipped top to bottom and left to right.
Release 0.3, 2013.11.30
1 Added first draft of instructions for setting up parallel UPS configuration.
Replaced connection diagrams with latest versions, and added tables for maximum input currents and
2
recommended CB ratings..
3 Various and numerous smaller updates.
Release 0.4, 2013.12.05
1 Updated system specs, mainly the dimensions and weights. Module weight now appx 19.8 kg.
2 Added dimensions and weights for 50 kW model.
3 Updated system controller specs according to catalog.
Release 1.0, 2013.12.25
1 Updated page 11 (battery connection instructions), including battery connection diagram (Figure 7).
2 Updated pages 14 and 15 (connection diagrams Figures 8 and 9).
3 Updated pages 15 and 16 Tables 3 and 4, showing maximum input currents and recommended CB sizes).
4 Added images for 50 kW model. These will have to be replaced with better ones later.
5 In tech. specs, added “4” to “Output frequency tracking range”.
Release 1.1, 2014.01
1 In technical specs, in “Topology” entry, added “modular” at the request of Sharon B.Z.
In technical specs, made the following corrections as per Omer H.:
updated dimensions to match the latest information.
Input voltage is now -10 % / +15 % (not -+10/-15)
2 in Input, changed “Power factor” to “Power factor correction”
in Output, rated power is now 25 to 200 (was 50 to 200)
in Output THD, value for non-linear load is now <6 % (was <8 %).
in Design and mfg standards, Safety, deleted IEC 60950.
3 Updated preventive maintenance procedures as per latest PM form.
4 Added parallel connection diagram.

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 GAMATRONIC, A SOLAREDGE DIVISION

Added warning in box and in text narrative that in order for proper current-sharing to take place in bypass
5 mode, the bypass input cable on each of the parallel UPSs must all be of the same length, and the bypass
input cable must be at least 10 meters long.
Changed lower end of input voltage range to -20 % (was -10%).
This naturally affects the statement of the actual voltage range values.
6
Input voltage: 3x400 Vac +N (-20 % / +15 %)
Input voltage range: 360 – 460 Vac: full power; 320 – 360 Vac: derated 20 %
Release 1.2, May 2014
A text warning that “FAST FUSES (SEMICONDUCTOR FUSES) must be used between the battery and the
1
Centric” was inserted in several places.
Release 1.3, June 2014
1 An image of the “Status” screen was added to the 100 kVA picture on the front cover.
Removed “fast fuse comments that were inserted in the previous release. Regular fuses are required, not
2
fast fuses.
Release 1.4, June 2014
1 Updated Figure 22 to include the D9 connector for RS485 (serial Modbus). (EC0 6691)
Release 1.5, July 2014
1 Added an illustration showing how to attach the cable stress reliever.
2 In technical specs, added comment that “Lithium-ion batteries are also supported”.
Changed “remote monitoring and control” of the UPS to “remote monitoring”, because remote control is not
3
permitted.
Release 1.6, August 2014
To the technical specifications page were added the weight and dimensions of the battery box for the 50 kW
1
system.
Release 1.7, September 2014
1 On page 38, in item 4, changed “two, three or more” to “two, three or four”.
2 On page 39, in item 5, added “Figure 24” to the list of figures.
Release 1.8, October 2014
1 Improved some wording in the Installation Checklist.
As per J. Goren, modified the technical specifications so that the units (%, m, V, etc.) are on the left side of
2
the page.
Release 1.9, November 2014
1 Added missing link to Figure 24 in section 3.1.2 which discusses the EPO contacts.
Release 2.0, November 2014
Added the following text in four locations: “FAST FUSES (SEMICONDUCTOR FUSES) must be used
1 between the battery and the Centric. For example, the Bussmann “FWH” fuse.”
This is in addition to the already existing note to use fast fuses in Figure 12. As per Aryeh Z.
Release 2.1, January 2015
In technical specs, updated item “Power walk-in” to read “>60”, as per J. Goren.
1
Had been “1 to 30 in 1 sec intervals”.
Release 2.2, 09.Feb.2015
Added the following warning to section 2.2.4.3:
1 “Warning: When two separate input lines are used for rectifier and bypass input,
the Neutral line must be shared (as in Figure 8 and Figure 9).”
Release 2.3, 14 May 2015
Added the following warning in two places as per Natan S.:
1 If you remove a UPS module from the Centric while the module is operating, wait five minutes
before reinserting the module. This allows the module’s capacitors time to discharge.
2 Added list of pin assignments of the d9 connectors for RS232 and RS485. See Table 5. As per Leon V.
Release 2.4. 2 July 2015

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 GAMATRONIC, A SOLAREDGE DIVISION

1 Added EMC statement on page “ii”.

2 Updated contents of “Safety Precautions” in front matter.
3 Changed location of cat.no. on front page – from under the book title to a text box in upper left corner.
4 Replaced the two cover images with lighter versions of the same. Looks much better when printed.
Release 2.5, 21 Sept. 2015
1 Updated cover page images as per Keren A.
Release 2.6, 2015-10-12
1 Updated technical specs: changed the input frequency line to read “Rectifier frequency 40 ~ 70 Hz”.
Added as Chapter 8: information about timing constants related to the use of an ATS to transfer the load to a
2
generator.
Release 2.7, 2015.11.02
1 In spec sheet, changed value of “Dc link voltage” to “+/- 405 V”, as per Natan S.
Release 2.8, 2015.12.15
1 In section 3.2.4.5, page 20, added Table 4, which contains minimum recommended size of battery cables.
2 Added safety warning in red on page 67 regarding replacement and disposal of batteries.
Release 2.9, 2016.05.26
Updated instructions for adding, replacing and removing a module. Flat cables must not be connected or
1
disconnected when the module is operating. Must be unseated from rear panel connectors.
2 Added “bypass voltage tolerance” to “input” section of spec sheet.
Release 3.0, 2016.11.23
Replaced the contents of section 4.5.3 “Check IP Communication with Controller” with something more
1
concise.
In section 3.2.5 (Initial start-up procedure) added
2
“Switch ON the external rectifier input circuit breaker.”
Release 3.1, 2017.05.07
In section 4.3.4.3 “Connecting the Centric to the electrical board” added legal disclaimer saying that the
1 connection diagrams are recommendations that may be subject to change to bring them into compliance
with local and national codes.
In section 9.2 added disclaimer that parallel installation plans must be approved by Gamatronic and their
2
execution must be witnessed by a Gamatronic representative.
Release 3.2, 2017.05.21
1 Updated “Standards and Conventions” to mention source of abbreviations.
2 In section 5.2, page 37, added some specific requirements for parallel Centric systems.
3 Added South African address to final page.
4 Changed a reference to “Power+” to “Centric”.
2017.06.28; Release 3.3
In sections 3.2.4.2 and 3.2.4.3, added text warning that if the UPS has been disconnected from the ac mains
1
for four months or greater, it must be run for four hours with no load, before applying any load.
In section 3.2.4.2, added a second copy of the notice that the connection diagram can be modified to satisfy
2
local regulations. This text already appears in section 3.2.4.3.
Replaced figures 38, 39, and 40 with latest versions. These are the parallel systems connection diagrams for
3
2, 3, and 4 units.
2017-07-26; Release 3.4
Added a few lines in section “4.1.2.2 Restarting the UPS after EPO”, offering an alternate and possibly
1
faster way of restarting the UPS after EPO. At the request of K.S.
2 In one location, Figure 28 was erroneously being referred to as Figure 27. Fixed this.
3 Added recommended torque values for the 200, 100, and 50 kW models. Search for “torque”.
2018-03-22, Doc. rel. 3.5
1 In section 4.1.3, added wiring instructions for LVD battery protection

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 GAMATRONIC, A SOLAREDGE DIVISION

In chapter 7 there were instructions for installing the LCD panel. These instructions were deleted, as the
2
LCD panel now comes to the customer fully installed.
2018-09-05 – Doc. vsn. 3.7.
1 In Technical Specs, updated Overload Withstand information, as per as per A.Z., J.G., S.BZ., S.M
2018-12-26, doc version 3.8
1 Further updates to logo, page headers, contact info.
2019-03-10, doc. vsn. 3.9
On page "ii" a warning was added stating that "an internal maintenance bypass switch is incompatible with
1 this UPS in a parallel configuration. If a parallel configuration is required, the maintenance bypass switch
must be external to the UPSs."
2019-08-4, doc. vsn. 4.0
1 Full document review + parallel system procedure
2019-12-9, doc. vsn. 4.2

2020-01-01, doc. vsn. 4.3

1 Maintenance bypass warnings
2 New spec's
2020-01-23, doc. vsn. 4.4
1 TN-XX and IT warning
2 Battery breaker warning
2020-01-23, doc. vsn. 4.5
1 LVD update
2020-03-25, doc. vsn. 4.6
1 Icw rating
2 Removal of data sheet
2020-04-05, doc. vsn. 4.7
1 Rearranged ac input terminals for easy single feed on cn50

82 Centric Installation Guide, rel. 4.7