INSTRUCTION MANUAL

FOR
STATIC VOLTAGE REGULATOR
Models: SSR 32-12NF
SSR 63-12NF
SSR 125-12NF

Part Numbers: 9 1859 00 106, 9 1859 00 108, and 9 1859 00 109

Publication Number: 9 1859 00 992

Revision: B 05/2001
 INTRODUCTION

This manual provides information concerning the operation and installation of Static Voltage Regulators.
To accomplish this, the following is provided.
• Specifications
• Functional Description
• Installation Information
• Operation
• Maintenance

WARNING
TO AVOID PERSONAL INJURY OR EQUIPMENT DAMAGE, ONLY QUALIFIED
PERSONNEL SHOULD PERFORM THE PROCEDURES PRESENTED IN THIS
MANUAL.

CAUTION
Meggers and high potential test equipment should be used with extreme care.
Incorrect use of such equipment could damage components contained in the
device.

SSR Introduction i
 First Printing: July 1991

Printed in USA

© 1999 - 2001, Basler Electric Co., Highland, IL 62249

May 2001

CONFIDENTIAL INFORMATION
OF BASLER ELECTRIC COMPANY, HIGHLAND, IL. IT IS LOANED FOR
CONFIDENTIAL USE, SUBJECT TO RETURN ON REQUEST, AND WITH THE
MUTUAL UNDERSTANDING THAT IT WILL NOT BE USED IN ANY MANNER
DETRIMENTAL TO THE INTEREST OF BASLER ELECTRIC COMPANY.

It is not the intention of this manual to cover all details and variations in equipment, nor
does this manual provide data for every possible contingency regarding installation or
operation. The availability and design of all features and options are subject to
modification without notice. Should further information be required, contact Basler
Electric Company, Highland, Illinois.

BASLER ELECTRIC
ROUTE 143, BOX 269
HIGHLAND, IL 62249 USA
http://www.basler.com, info@basler.com
PHONE 618-654-2341 FAX 618-654-2351
ii SSR Introduction
 CONTENTS

SECTION 1 GENERAL INFORMATION ......................................................................................................1-1

Description .................................................................................................................................1-1
Specifications.............................................................................................................................1-1
Accessories................................................................................................................................1-3
Spike Suppression Module .......................................................................................................1-3

SECTION 2 INSTALLATION ........................................................................................................................2-1

Mounting ....................................................................................................................................2-1
Voltage Regulator Mounting ...........................................................................................2-1
Spike Suppression Module Mounting .............................................................................2-2
Interconnection ..........................................................................................................................2-2
General ............................................................................................................................2-2
Regulator Sensing Connections .....................................................................................2-3
Field Power Connection ..................................................................................................2-7
Input Power......................................................................................................................2-7
External Control Input......................................................................................................2-7
Remote Voltage Adjust Rheostat....................................................................................2-7
Parallel Compensation ....................................................................................................2-8
Reactive Droop Compensation.......................................................................................2-8
Reactive Differential (Cross-Current) Compensation.....................................................2-8
Overexcitation Circuit Breaker ........................................................................................2-8

SECTION 3 OPERATION .............................................................................................................................3-1

Front Panel Controls and Indicators .........................................................................................3-1

VOLT Adjustment ............................................................................................................3-1
STAB Adjustment ............................................................................................................3-1
DROOP ADJUST Control ...............................................................................................3-1
Optional Voltage Shutdown Switch...........................................................................................3-1
Initial Operation..........................................................................................................................3-2
Preliminary Instructions ...................................................................................................3-2
System Check-out ...........................................................................................................3-2
Field Flashing.............................................................................................................................3-2
Parallel Operation ......................................................................................................................3-3
Preliminary Instructions ...................................................................................................3-3
Preliminary Operation......................................................................................................3-3
Conditions Necessary for Paralleling..............................................................................3-3
Paralleling Operation.......................................................................................................3-3

SECTION 4 MAINTENANCE ........................................................................................................................4-1

Preventive Maintenance............................................................................................................4-1
Corrective Maintenance ............................................................................................................4-1
Warranty and Repair Service ....................................................................................................4-1
Troubleshooting .........................................................................................................................4-1
Operational Testing ...................................................................................................................4-1

SSR Introduction iii

 CONTENTS-Continued

SECTION 5 REPLACEMENT PARTS .........................................................................................................5-1

General ......................................................................................................................................5-1

SECTION 6 MANUAL CHANGE INFORMATION ......................................................................................6-1

Changes ....................................................................................................................................6-1

iv SSR Introduction
SECTION 1 • GENERAL INFORMATION
DESCRIPTION
The Basler SSR Series Voltage Regulators precisely controls the output voltage of an ac electric
generating system by controlling the amount of current supplied to the exciter (or generator) field. The
SSR Series Voltage Regulators are for use on brushless generators that require a high performance
regulator and use a wide range of accessory devices.
Both the SSR 63-12NF and SSR 125-12NF have full-wave outputs, while the SSR 32-12NF is of the half-
wave output type.

SPECIFICATIONS
Refer to Table 1-1 for the electrical specifications and to Table 1-2 for the physical specifications.

Table 1-1. Electrical Specifications

Input Power Requirements

SSR 32-12NF: 100 to 139 Vac ±10% (Nominal), 1 φ, 50 to 240 Hz., 700 VA
SSR 63-12NF: 100 to 139 Vac ±10% (Nominal), 1 φ, 50 to 240 Hz., 1200 VA
SSR 125-12NF: 190 to 277 Vac ±10% (Nominal), 1 φ, 50 to 240 Hz., 2400 VA
Input Sensing Requirements:
50 Hz: 90-110/170-242/340-457 Vac, 3 φ (selectable 1 φ)
60 Hz: 90-132/187-264/374-528/540-660 Vac, 3 φ (selectable 1 φ)

Input Sensing Burden: 10 VA per phase.

Paralleling Compensation Input: 5 A from CT at rated load with 10 VA maximum burden at 0.8 pf.
Regulation Accuracy: ±0.25% from no-load to full-rated load.
Thermal Stability: ±0.5% for any 50°C change within operating range.
Power Dissipated: 30 W maximum.
Power Output:
SSR 32-12NF: 32 Vdc/12 A Continuous; 50 Vdc/20 A Forcing (115 V input).
SSR 62-12:NF 63 Vdc/12 A Continuous; 100 Vdc/20 A Forcing (115 V input).
SSR 125-12NF: 125 Vdc/12 A Continuous; 200 Vdc/20 A Forcing (230 V input).
Minimum Field Resistance:
SSR 32-12NF: 2.5 ohms
SSR 63-12NF: 5.0 ohms
SSR 125-12NF: 10.0 ohms
Voltage Build-Up: From 6 volts residual or more (12 V for the SSR 125-12NF only).
Internal Voltage Adjust Range For 120 V Tap: 90 to 132 Vac;
(Minimum): For 240 V Tap: 170 to 264 Vac;
For 480 V Tap: 340 to 528 Vac;
For 600 V Tap: 540 to 660 Vac.
External Voltage Adjust Range: ±10% of nominal.
Optional Circuit Breaker: Rated at 20 A, 277 Vac, 50/60 Hz., with a 5000 A interrupting
capacity.

SSR General Information 1-1

 Table 1-1. Electrical Specifications - Continued

Overexcitation Protection: Removes excitation if the regulator output is at 95% of rated

forcing voltage for more than 60 seconds or instantaneously (<1
second) if output exceeds 130 % of rated forcing voltage. Refer
to Figure 1-1.

Figure 1-1. Overexcitation Shutdown Curve

Table 1-2. Mechanical Specifications

Storage Temperature Range: -40°C (-40°F) to +85°C (+185°F).

Operating Temperature -40°C (-40°F) to +70°C (+158°F).
Range:
Humidity: The control module is totally protected for humidity and
condensation by encapsulation.
Vibration: Withstands the following:
5 to 26 Hz. at 1.2 G's;
27 to 52 Hz. at 0.036 inch double amplitude;
53 to 1000 Hz. at 5.0 G's.
Shock: Withstands 15 G's in each of three mutually perpendicular
planes.
Weight: 12 lbs. (5.5 kg) net; 15 lbs. (7.0 kg) shipping.

Overall Dimensions:
Height: 9.0 inches (230 mm)
Width: 11.1 inches (281 mm)
Depth: 3.6 inches (93 mm)
Optional Circuit Breaker:
Shock: Withstands 100 G's.
Vibration: Withstands 10 G's.
Weight: 10 ounces (280 grams) net.

1-2 SSR General Information

ACCESSORIES
The SSR Series Voltage Regulators are designed to be compatible with any of the Basler accessories
and equipment listed below:
a. Remote mounted Overexcitation Circuit Breaker (P/N 9 1859 00 014). Refer to Section 2 for more
information.
b. VAR/Power Factor Controller (SCP 250)
c. Series Boost Option (SBO 160)
d. Current Transformers (CT2 through CT50)
e. Exciter Diode Monitor (EDM 200)
f. Minimum/Maximum Excitation Limiter (EL 200)
g. Auto-Synchronizer (BE3-25A)
h. Auto-Synchronizer (BE1-25A)
i. Line Drop Compensator (LDC 300)
j. Low and Medium Power Isolation Transformers. Refer to Table 1-3.

Table 1-3. Transformer Selection

Voltage SSR 32-12NF SSR 63-12NF SSR 125-12NF

240/480 BE22207-001 BE22209-001 BE12819-001

600 BE22207-001 BE11050-001 BE22209-001
2400/4160 BE22208-001 BE13487-001 BE12818-001
7200 BE22210-001 BE22136-001 BE22136-001
13800 BE22210-001 BE21327-001 BE21327-001

* Transformers used with the SSR 32-12NF are designed to be compatible with the regulator's half-wave
dc output.

SPIKE SUPPRESSION MODULE

Some higher impedance power sources (such as power isolation transformers and PMG's) may have
enough inductance to cause potentially damaging voltage spikes in the power output stage of the SSR
Voltage Regulator. In these cases, Basler Electric recommends the use of the Spike Suppression
Module which was supplied with the Regulator to filter out these potentially damaging voltage spikes.
Refer to Section 2 for mounting and interconnection instructions.

SSR General Information 1-3

SECTION 2 • INSTALLATION
MOUNTING

Voltage Regulator Mounting

The Voltage Regulator will operate when mounted in any position, however, it should be vertically
mounted to obtain optimum cooling. The Regulator can be mounted in any location where the ambient
temperature does not exceed the operational limits. Due to its rugged construction, the Regulator can be
mounted directly on the generator. Mounting hardware should be selected based upon the vibration and
shock expected to be encountered during shipping/transport and normal operation. Refer to Figure 2-1
for the outline drawing of the unit which provides overall and mounting dimensions.

Figure 2-1. SSR Regulator, Outline Drawing

SSR Installation 2-1

Spike Suppression Module Mounting
The Spike Suppression Module will operate when mounted in any position. The Spike Suppression
Module can be mounted in any location where the ambient temperature does not exceed the operational
limits. Due to its rugged construction, the Spike Suppression Module can be mounted directly on the
generator. Mounting hardware should be selected based upon the vibration and shock expected to be
encountered during shipping/transport and normal operation. Refer to Figure 2-2 for the outline drawing
of the unit which provides overall and mounting dimensions.

Figure 2-2. Spike Suppression Module, Outline Drawing

INTERCONNECTION

CAUTION
Meggers and high potential test equipment must not be used. Incorrect use of such
equipment could damage the semiconductors in the Regulator.

General
The Regulator must be connected to the generator system as instructed in this section and as shown in
the basic interconnection diagrams (refer to Figures 2-3 through 2-5).

NOTE
If the input power source is from a power isolation transformer or a PMG, the Spike
Suppression Module should be connected to provide transient voltage spike protection
for the Regulator.

2-2 SSR Installation

Regulator Sensing Connections

Three-Phase Sensing
The SSR Voltage Regulators contain internal sensing transformers with taps for the various input sensing
voltages. Connect the input sensing (external terminals) as follows (refer to Figure 2-3):
(a) Connect terminal TB2-E1 (C) to phase A.
(b) Connect terminal TB2-E2 (Taps for 120, 240, 480, and 600 Vac are provided) to phase B.

CAUTION
Be sure to use the same value tap for TB2-E3 that was used for TB2-E2.

(c) Connect terminal TB2-E3 (Taps for 120, 240, 480, and 600 Vac are provided) to phase C.
(d) Be sure to remove any jumper installed across terminals TB1-21 and TB1-22.

Single-Phase Sensing
The SSR Voltage Regulators use the same internal sensing transformer for single-phase sensing that it
uses for three-phase sensing. Connect the input sensing (external terminals) as follows (refer to Figure
2-4):
(a) Install a jumper between terminals TB1-21 and TB1-22.
(b) Connect terminal TB2-E1 (C) to phase A.
(c) Connect terminal TB2-E3 (Taps for 120, 240, 480, and 600 Vac are provided) to phase C.

SSR Installation 2-3

 Figure 2-3. Typical SSR Voltage Regulator Interconnection, Single-Phase Sensing

2-4 SSR Installation

 Figure 2-4. Typical SSR Voltage Regulator Interconnection, Three-Phase Sensing

SSR Installation 2-5

 Figure 2-5. SSR Voltage Regulator Interconnection with PMG

2-6 SSR Installation

Field Power Connection
(1) Be sure to observe polarity and connect the field leads to terminals TB2-F+ and TB2-F-.
(2) The dc resistance of the field to which the Regulator is connected (terminals TB2-F+ and TB2-F-)
must be equal to, or greater than that specified in Table 1-1. If the resistance is less than the
specified minimum, a resistor must be added in series with the field. This resistor value plus the field
resistance, must be equal to or greater than the minimum field resistance.

Input Power
(1) The input power connected to terminals TB2-3 and TB2-4 should be fused and may be taken from
any generator lines that provide the correct voltage (line-to-line or line-to-neutral) as specified in
Table 1-1. If line-to-neutral is used with a grounded neutral, it is strongly recommended that a power
isolation transformer be used to limit the possibility of a ground loop. The phase relationship on this
input to the other inputs is not important.
(2) When the generator output voltage does not match the values given in Table 1-1, a power
transformer must be used to match the generator output to the Regulator input (refer to Table 1-3 for
proper transformer selection). If excessive voltage is applied to the Regulator, the Regulator will be
damaged.

CAUTION
Without the use of a power isolation transformer, any ground in the field circuit and
another ground in the generator output could result in Regulator failure.

NOTE
On prime mover applications that require a long time to reach rated RPM, a speed switch
setting should be coordinated such that input voltage applied to the SSR is above the
SSR minimum residual build-up level. The minimum residual build-up level is 6 Vac for
the SSR32-12NF and SSR63-12NF, and 12 Vac for the SSR125-12NF.

(3) If the field or field flashing circuit is grounded, a power transformer must be used to isolate the
Regulator input from ground.
(4) If the SSR is powered directly from a 50 Hz or 60 Hz generator output (as in Figures 2-3 and 2-4),
install a jumper between terminals TB1-25 and TB1-30. If the SSR is powered from a special source,
such as a PMG (as in Figure 2-5), the frequency of the incoming power must be considered. If this
frequency is less than 120 Hz, install a jumper between terminals TB1-25 and TB1-30. If the input
power frequency is between 120 Hz and 240 Hz, then remove any jumpers connecting terminals
TB1-25 and TB1-30.

External Control Input

When using an external control device such as a VAR/Power Factor Controller (SCP 250), Auto-
Synchronizer (BE1-25A or BE3-25A), and/or a Minimum/Maximum Excitation Limiter (EL 200), then
connect them in series with terminals TB1-23 and TB1-24. Refer to the accessory item manuals for
proper connection.

Remote Voltage Adjust Rheostat

When using an external voltage adjust rheostat, connect the rheostat to terminals TB1-6 and TB1-7. Use
the potentiometer supplied with the Regulator (as a loose item) or replace it with any 5 kW, 2 Watt
rheostat/potentiometer. If using only the internal voltage adjust, install a jumper across terminals TB1-6
and TB1-7. If shielding of the wiring is required due to its location in a high noise environment, connect
the shield to terminal 30 of the SSR. If connected anyplace else, the shielding will not have any effect.

SSR Installation 2-7

Parallel Compensation
(1) When it is required to operate the generator in parallel, a 25 VA current transformer (CT) is required.
The CT is connected into the generator line and should deliver from 3 to 5 amperes secondary
current at rated load to the Regulator terminals, TB2-1 and TB2-2.
(2) The phase relationship of the CT signal to the Regulator sensing input must be correct or the system
will not parallel properly. For three-phase sensing, the CT must be installed in the line supplying the
sensing voltage to terminal TB2-E2 (phase B). For single-phase sensing, the CT must be installed in
the line that does not supply sensing to the Regulator (phase B).

Reactive Droop Compensation

(1) For reactive droop compensation, connect the Regulator to the CT as shown by Figures 2-3 and 2-4.
(2) A unit/parallel switch shorts the parallel CT secondary to prevent any droop signal from being injected
into the regulating system during single-unit operation. The switch may not be required on parallel
droop compensation applications where a voltage drop is not objectionable.

Reactive Differential (Cross-Current) Compensation

(1) On parallel reactive differential (cross-current) compensation applications, a contact should be used
to short out the paralleling CT secondary when that generator is not paralleled to the bus. If the
switch is not used, a voltage droop will be introduced into the system. This is due to the unloaded
generator parallel CT not supplying a compensated signal, but allowing a voltage drop to occur
across it. Lack of this shorting contact will also cause the voltage of the oncoming generator to
fluctuate prior to paralleling. Ideally, this contact is an auxiliary of the circuit breaker contractor (52
device) that opens when the breaker is closed.
(2) For reactive differential (cross-current) compensation, refer to Figure 2-6 when only SSR's are being
used. If SSR's and non-SSR regulators are used, refer to Figure 2-7. First connect each CT to its
respective Regulator. Then connect the end of the first CT to the start of the second CT, the end of
the second CT to the start of the third, etc. Continue until all of the CT's are connected in series. The
final step will be to connect the end of the last CT to the start of the first CT.
(3) Reactive differential compensation should not be used with generators in parallel with the utility or
any infinite bus. If the system will be paralleled with a source not in the loop, a switching circuit must
be used to convert the system to a reactive droop compensation system by opening the loop at any
point.

Overexcitation Circuit Breaker

An optional Overexcitation Circuit Breaker is available which will perform three functions as follows (refer
to Figures 2-8 through 2-10):
(1) The Circuit Breaker can be operated manually to perform as an On/Off switch to apply or remove ac
power and replaces the input power fuses connected to terminals TB2-3 and TB2-4.
(2) The Circuit Breaker will respond to a special signal from the overexcitation circuit in the Regulator.
This signal will open the Circuit Breaker if the field voltage remains after the internal overexcitation
circuit has tripped and thus provide a back-up to the Regulator circuitry. This condition could arise as
a result of component failure within the regulator.
(3) In 50/60 Hz applications, the Circuit Breaker provides overcurrent protection. For higher frequency
power sources such as a PMG, fuses must be used to provide proper overcurrent protection.

2-8 SSR Installation

 Figure 2-6. Reactive Differential (Cross Current) Compensation CT's Interconnection

SSR Installation 2-9

 Figure 2-7. Overexcitation Circuit Breaker Outline Drawing

Figure 2-8. Overexcitation Circuit Breaker Panel Cutout Drawing

2-10 SSR Installation

 Figure 2-9. Overexcitation Circuit Breaker Interconnection Drawing

SSR Installation 2-11

SECTION 3 • OPERATION
FRONT PANEL CONTROLS AND INDICATORS

VOLT Adjustment
This adjustment is used to control the generator output voltage. When adjusted fully counter-clockwise
(CCW), minimum generator voltage is obtained. Maximum generator voltage is obtained with full
clockwise (CW) rotation. This adjustment also allows for centering the external (remote) voltage adjust
rheostat if it is used.

STAB Adjustment
This adjustment is used to provide stable Regulator operation. Normally, this adjustment is factory set in
the (CW) position. While this setting assures good stability, it does tend to slow the generator response
time. If rotated CCW, the generator response time will decrease. However, if rotated too far CCW, the
generator voltage may oscillate (hunt). It should then be rotated CW to a point well above the point
where oscillation occurred. The system voltage instability is most likely to occur at no-load.

DROOP ADJUST Control

This adjustment sets the level of the reactive droop compensation.

OPTIONAL VOLTAGE SHUTDOWN SWITCH

CAUTION
When a voltage shutdown switch is used, it must always be installed in the input power
circuit (Terminals TB2-3 and TB2-4). A high flyback could develop and damage the
Regulator and/or Exciter field if this switch were installed in the dc field circuit (Terminals
TB2-F+ and TB2-F-).

CAUTION
To avoid high voltage arcing, the field circuit must never be opened during operation. Also,
a shutdown circuit using a field discharge resistor in the exciter field circuit must not be
used. Safe shutdown can be accomplished only by interrupting the Regulator input ac pow-
er.

The Voltage Regulator and generator system may be equipped with a switch in the input power circuit to
allow removal of the excitation from the field in an emergency or when the prime mover must be operated
at an extremely reduced speed. If this switch is not used, it is recommended that a switch be temporarily
be installed for the initial start-up.

SSR Operation 3-1

INITIAL OPERATION

Preliminary Instructions
Verify that all wiring is properly and securely connected. Refer to Section 2.

System Check-out
Perform the following steps to ensure the proper operation of the Regulator during initial operation:
(1) Start the prime mover and bring up to rated speed. If a voltage shutdown switch is used, close the
switch to apply excitation. When this switch is not used, generator voltage will build up automatically.
(2) Verify generator voltage. Note that any of the following conditions may occur:

Overvoltage
If this condition occurs, open the shutdown switch and stop the prime mover. Determine the cause of the
overvoltage. If necessary, refer to the troubleshooting chart in Section 4.

No Voltage Build-up
If this condition occurs, field flashing may be required. Refer to the following sub-section Flashing.

Undervoltage
If this condition occurs, adjust the VOLT control. If not corrected, refer to the troubleshooting chart in
Section 4.

Voltage Builds Up and Then Collapses

If this condition occurs, stop the prime mover and determine the cause by referring to the troubleshooting
chart in Section 4.

Oscillating Voltage
If this condition occurs, rotate the front panel STAB adjustment to correct. If the voltage continues to
oscillate and the STAB control has no effect, refer to the troubleshooting chart in Section 4.
(3) Adjust the front panel VOLT control for nominal generator output.
(4) Apply load to the generator.
(5) Verify that the voltage regulation is within ±0.25%. If not, refer to the troubleshooting chart in Section
4.
(6) Alternately remove and apply the load to determine if the generator voltage is stable.

FIELD FLASHING
CAUTION
Do not attempt to flash the machine when it is rotating.

When the Voltage Regulator is operated with the generator for the first time, the polarity of residual
magnetism may not be correct or of sufficient magnitude. If the generator does not build up after start-up,
check for 6 volts or more residual at the Regulator terminals TB2-3 and TB2-4. If the voltage is below 6
volts, shut down the prime mover and proceed as follows:
a. With the prime mover at rest, apply a dc source (non-grounded) of not more than 12 Vdc, to terminals
"F+" (positive) and "F-" (negative) while observing polarity, in series with a limiting resistor of 25 - 30
ohms.
b. Allow approximately 3 seconds before removing the dc source.

3-2 SSR Operation

c. With the Voltage Regulator power input disconnected (terminals TB2-3 and TB2-4), start the prime
mover and measure the voltage at the generator terminals. If the generator output is less than 6
volts, repeat steps a. and b. If the voltage is greater than 6 volts, voltage build-up should occur. Stop
the prime mover and reconnect the Regulator input power.

PARALLEL OPERATION
The following paragraphs describe the procedures to be followed when operating two or more generators
in parallel. In order to ensure proper operation, the following requirements must be met:
(1) The voltage regulating systems must cause the generators to share the total kVAR load,
and
(2) The speed governing system must make the generators share the total kW load.

Preliminary Instructions
It is essential that the paralleling signal at terminals TB2-1 and TB2-2 of the regulator have the proper
phase relationship with that of the sensing voltages at terminals TB2-E1, TB2-E2, and TB2-E3. Verify
that these connections are made as shown by Figure 2-2. If reactive differential (cross-current)
compensation is desired, the paralleling CT's must be connected as described in Section 2. A CT must
be selected which will furnish 3 to 5 amperes at the rated generator load current.

Preliminary Operation
Before attempting to parallel two or more generators, it is recommended that the individual generators be
tested to verify that the paralleling features function properly. Test as follows:
(1) Place each generator in operation in accordance with initial operation instructions.
(2) Verify that the paralleling CT secondary is not shorted. (Unit/Parallel switch in Parallel position.)
(3) Verify that the front panel DROOP ADJUST control is adjusted for maximum droop.
(4) Apply 25% to 100% unity power factor load to the generator under test. The generator voltage
should not change more than 1%.
(5) Apply 25% to 100% 0.8 PF inductive load to the generator under test. The generator voltage should
droop from 2% to 6% with the reactive load. If the voltage rises instead of drooping, reverse the CT
sensing leads.
(6) Verify that the voltage and speed do not drift or jump erratically.

Conditions Necessary for Paralleling

In order to prevent damage to the generator and/or prime mover, paralleling should be attempted only
when the generator speeds (frequencies) are equal and at the instant when the generator voltages are
equal. That is, they have the same phase sequence of voltage and the voltages are in phase.

Paralleling Operation
The following instructions describe the procedures for paralleling two or more generators. If using an
auto-synchronizer (such as the Basler BE1-25A or BE3-25A) than all adjustments and the breaker
closure are automatically performed by the auto-synchronizer.
(1) Start generator No. 1 and verify that the bus is dead.
(2) Close the breaker connecting generator No. 1 to the bus.
(3) Adjust the generator voltage and frequency to nominal.
(4) Apply the load. (If possible, the load should be at least 10% or more of the generator kW rating.)
(5) Start generator No. 2 and adjust the output to nominal.

SSR Operation 3-3

(6) Adjust generator No. 2's speed slightly higher than that of No. 1's. Speeds must be within 0.1 Hz
(10 second rotation of synchroscope through 360°).
(7) At zero phase angle between the generator and bus, close the breaker for the No. 2 generator and
immediately read the ammeter for No. 2. The reading should be well within the generator rating
and the operation stable. If not, shut down the system and troubleshoot.
(8) Adjust the speed of No. 2 to the point where each set is carrying the desired share of the load.
(9) Adjust the voltage of No. 2 until the ammeter reading (of both generators) are near minimum.
(10) If kVAR meters are available, adjust the front panel DROOP ADJUST on Regulator No. 2 for an
equal kVAR reading.
(11) If the generators are equipped with power factor meters instead of kW meters, alternately adjust
the speed and droop of No. 2 until the ammeter readings are proportional and the power factor
readings are equal.

NOTE
For best results, final adjustments should be made with a full load on the bus.

(12) With a full load applied, readjust the speed and voltage on No. 2 until the desired load division is
obtained.

3-4 SSR Operation

SECTION 4 • MAINTENANCE
PREVENTIVE MAINTENANCE
The only preventive maintenance required on the SSR Series Voltage Regulators is to periodically check
that the connections between the Regulator and system are clean and tight and that the Regulator
cooling fins and housing are free from accumulations of dirt and dust.

CORRECTIVE MAINTENANCE
The SSR Series Voltage Regulators are designed for ease of repair by the replacement of major parts,
such as the transformers, power module, or electronics module. Refer to Section 5 for part numbers.

WARRANTY AND REPAIR SERVICE

The Basler SSR Series Voltage Regulators are warranted against defective material and workmanship for
18 months from the date of shipment from our factory. Units submitted for warranty repair should be
returned to the factory in Highland, Illinois, freight prepaid, with a complete description of the installation
and the reported problem. Pre-arrangement with either the nearest Basler Sales Office or with the factory
will assure the fastest possible turn around time.

TROUBLESHOOTING
The more common generator system malfunctions and the appropriate repair procedures are listed in
Table 4-1.

OPERATIONAL TESTING
To test the SSR Voltage Regulator, refer to Figure 4-1 and proceed as follows:
a. Adjust the front panel STAB control fully counter-clockwise (CCW).
b. Connect the circuit as shown in Figure 4-1. The light bulb should be a 120 V type of not more than
300 W).
c. Adjust the Voltage Adjust Rheostat for maximum resistance.
d. Connect the regulator to a power source. Note that the light bulbs may flash momentarily.
e. Slowly rotate the Voltage Adjust Rheostat toward minimum resistance. The light should reach full
brilliance before minimum resistance is attained. (If the light does not illuminate, adjust the front
panel VOLT control.)
f. At the regulating point, a small change in the Voltage Adjust Rheostat should turn the light on or off.

NOTE
If the light bulb(s) do not illuminate, the regulator is defective.

g. This test may not reveal a stability problem. However, rotating the front panel STAB adjustment
should affect the bulb's turn on/turn off time.

SSR Maintenance 4-1

 Figure 4-1. Operational Test

Table 4-1. Troubleshooting Table

SYMPTOM
CORRECTIVE ACTION

1. VOLTAGE DOES NOT BUILD UP TO RATED VALUE.

Step 1. Check for low residual voltage (less than 6 volts).
If low residual voltage exists, flash the field in accordance with Section 3.
If residual voltage is normal, proceed to step 2.

Step 2. Check Shutdown Switch and fuses.

Check that Shutdown Switch is closed.
Check that fuses are intact.
If Shutdown Switch is closed and fuses are intact, proceed to step 3.

Step 3. Check that prime mover is up to speed.

If prime mover is operating at rated speed, proceed to step 4.

Step 4. Verify that generator output is not shorted or heavily loaded.

If output is not shorted, proceed to step 5.

4-2 SSR Maintenance

 Table 4-1. Troubleshooting Table - Continued

SYMPTOM
CORRECTIVE ACTION

Step 5. Verify that the wiring between the external Voltage Adjust Rheostat and terminals TB1-6
and TB1-7 is not defective.
If wiring is defective, repair or replace wiring.
If wiring is not defective, proceed to step 6.

Step 6. Replace the external Voltage Adjust Rheostat and wiring with a jumper across terminals
TB1-6 and TB1-7. Check for proper operation by adjusting the front panel VOLTS
control.
If voltage build-up occurs, replace the external rheostat.
If voltage build-up does not occur, replace the regulator.

2. VOLTAGE BUILDS UP AND THEN DECAYS.

Check for open circuit from external Voltage Adjust Rheostat (if used), or lack of jumper across
TB1-6 and TB1-7 (if an external Voltage Adjust Rheostat is not used).
If connections to TB1-6 and TB1-7 are not defective, replace the electronics module.

3. VOLTAGE HIGH AND UNCONTROLLABLE WITH VOLTAGE ADJUST RHEOSTAT.

CAUTION
The generator and exciter may be damaged by operation this condition for more than 5
to 10 seconds. Use the shutdown switch to minimize operating time.

Step 1. Adjust the front panel VOLT control fully CCW.

If this reduces the voltage below nominal value, adjust for nominal voltage and
discontinue troubleshooting. If not, proceed to step 2.

Step 2. Verify that sensing voltage is available at terminals TB2-E1, TB2-E2, and TB2-E3 and
that the proper taps are used.
If sensing voltage is not available, correct wiring.
If sensing voltage is proper, proceed to step 3.

Step 3. Replace the internal sensing transformers (BE 21755-001).

Step 4. Replace the electronics module.

4. VOLTAGE HIGH AND CONTROLLABLE WITH VOLTAGE ADJUST RHEOSTAT.

Step 1. Adjust the front panel VOLT control fully CCW.
If this action reduces the voltage below nominal, adjust for nominal voltage and
discontinue troubleshooting. If not, proceed to step 2.

SSR Maintenance 4-3

 Table 4-1. Troubleshooting Table - Continued

SYMPTOM
CORRECTIVE ACTION

Step 2. Verify that the sensing voltage is available at terminals TB2-E1, TB2-E2, and TB2-E3 and
that the proper taps are used.
If the sensing voltage is not available, repair wiring.
If the sensing voltage is proper, proceed to step 3.

Step 3. If using single-phase sensing, verify that the jumper across terminals TB1-21 and TB1-22
has been installed.
If jumper is not present, install jumper.
If jumper has been installed, proceed to step 4.

Step 4. Check for defective voltmeter.

If voltmeter is defective, replace voltmeter.
If voltmeter is not defective, proceed to step 5.

Step 5. Replace the internal sensing transformers (BE 21755-001).

Step 6. Replace the electronics module.

5. VOLTAGE LOW AND CONTROLLABLE WITH VOLTAGE ADJUST RHEOSTAT.

Step 1. Verify that prime mover is up to rated speed.
If prime mover is not operating at rated speed, increase speed.
If prime mover is operating at rated speed, proceed to step 2.

Step 2. Verify that the sensing voltage is available at terminals TB2-E1, TB2-E2, and TB2-E3 and
that the proper taps are used.
If the sensing voltage is not available, repair wiring.
If the sensing voltage is proper, proceed to step 3.

Step 3. If using three-phase sensing, verify that the jumper across terminals TB1-21 and TB1-22
has been removed.
If jumper is present and three-phase sensing is used, remove jumper.
If jumper has been removed or three-phase sensing is not used, proceed to step 4.

4-4 SSR Maintenance

 Table 4-1. Troubleshooting Table - Continued

SYMPTOM
CORRECTIVE ACTION

Step 4. Check for defective voltmeter.

If voltmeter is defective, replace voltmeter.
If voltmeter is not defective, proceed to step 5.

Step 5. Replace the electronics module.

6. POOR REGULATION
Step 1. Verify that the field voltage/current requirements at full load are not in excess of the
maximum Regulator output capability.
If Regulator limits are being exceeded (per Table 1-1), consult with factory for suitable
model.
If regulator limits are not exceeded, proceed to step 2.

Step 2. Verify that the input power to terminals TB2-3 and TB2-4 is correct (see Table 1-1).
If input power is incorrect, connect proper power input.
If input power is correct, proceed to step 3.

Step 3. Verify that generator output voltmeter is connected at the same location as sensing
inputs.
If voltmeter location is different, reconnect.
If voltmeter location is the same, proceed to step 4.

Step 4. Check for waveform distortion due to harmonic content in generator output voltage.
(Regulator senses average voltage, meter may be indicating RMS value.)
If waveform distortion is present, use an average sensing (rectifier type) voltmeter to
verify regulation accuracy.
If waveform distortion is not present, proceed to step 5.

Step 5. Verify that Unit/Parallel switch is in Unit position except during parallel operation.
If Unit/Parallel is in incorrect position, place switch into proper position.
If Unit/Parallel switch is in proper position, proceed to step 6.

Step 6. Verify that load is balanced (three-phase sensing only).

If load is unbalanced, measure three phase-to-phase voltages at no-load and full-load.
Calculate the average of these voltages to verify regulation accuracy.
If load is balanced, proceed to step 7.

SSR Maintenance 4-5

 Table 4-1. Troubleshooting Table - Continued

SYMPTOM
CORRECTIVE ACTION

Step 7. Replace the electronics module.

7. POOR STABILITY
Step 1. Check the adjustment of the front panel STAB control (Section 3).
If the front panel STAB control is out of adjustment, readjust.
If the front panel STAB control is in adjustment, proceed to step 2.

Step 2. Check for unstable frequency.

If the frequency is unstable, consult governor manual.
If the frequency is stable, proceed to step 3.

Step 3. Replace the electronics module.

8. VOLTAGE RECOVERY SLOW WITH LOAD CHANGE.

Step 1. Check the adjustment of the front panel STAB control (Section 3).
If the front panel STAB control is out of adjustment, readjust.
If the front panel STAB control is in adjustment, proceed to step 2.

Step 2. Verify that the field voltage/current requirements at full load are not in excess of the
maximum Regulator output capability.
If Regulator limits are being exceeded (per Table 1-1), consult with factory for suitable
model.
If regulator limits are not exceeded, proceed to step 3.

Step 3. Replace the electronics module.

9. PARALLEL GENERATORS DO NOT DIVIDE REAL kW LOAD EQUALLY.

Consult governor manual.

10. PARALLEL GENERATORS DO NOT DIVIDE REACTIVE LOAD EQUALLY.

Step 1. Verify that sensing CT is rated to produce 3 to 5 amperes at rated load.
If CT is of improper size, replace CT.
If CT is of proper size, proceed to step 2.

4-6 SSR Maintenance

 Table 4-1. Troubleshooting Table - Continued

SYMPTOM
CORRECTIVE ACTION

Step 2. Verify that terminals TB2-1 and TB2-2 are not shorted.
If terminals are shorted, open terminals.
If terminals are not shorted, proceed to step 3.

Step 3. Refer to Section 3 to verify proper connections and to test parallel compensation circuit.

SSR Maintenance 4-7

SECTION 5 • REPLACEMENT PARTS
GENERAL
The following list (Table 5-1) describes the components of the SSR Series of Voltage Regulators that
have maintenance significance. When ordering parts from Basler Electric Company, be sure to specify
the Regulator model and part number and the Basler component part number, quantity, and description.
Unless otherwise specified, all components are interchangeable.
Table 5-2 provides a Model Number to Part Number Cross-Reference list of the SSR regulators.

Table 5-1. Replacement Parts

Basler Part Number Qty Description

9 1859 01 105 1 Printed Circuit Board Assembly (Model SSR 32-12NF Only)
9 1859 01 104 1 Printed Circuit Board Assembly (Model SSR 63-12NF Only)
9 1859 01 103 1 Printed Circuit Board Assembly (Model SSR 125-12NF Only)
19781 1 Resistor, Variable, 15 W, 5 W
19364 2 Power Module (SSR 63-12NF and SSR 125-12NF Only)
19763 1 SCR Module (SSR 32-12NF Only)
19764 1 Diode Module (SSR 32-12NF Only)
BE22352-001 1 Transformer
BE21600-001 1 Transformer
BE21755-001 1 Transformer
BE21756-001 1 Transformer
02682 1 Potentiometer, 5 kW, 2 W
9 2615 00 100 1 Spike Suppression Module (Models SSR32-12NF & SSR63-
12NF Only)
9 2615 00 101 1 Spike Suppression Module (Model SSR125-12NF Only)

Table 5-2. Part Number to Model Number Cross-Reference List

Model Number Part Number

SSR 32-12NF 9 1859 00 109

SSR 63-12NF 9 1859 00 108
SSR 125-12NF 9 1859 00 106

SSR Replacement Parts 5-1

SECTION 6 • MANUAL CHANGE INFORMATION
CHANGES
Substantive changes in this manual to date are summarized in Table 6-1.

Table 6-1. Summary of Changes

Revision Summary of Changes ECO Date
No.
A Changed the format of the manual. Added information on the Spike 3319 04-30-99
Suppression Module to all Sections as appropriate. Added Section 6
“Manual Change Information.”
B Corrected Table 5-2 13428 05-11-01

SSR Manual Change Information 6-1