Rectifier / Battery Charger

Type Single & Three Phase

DC Power Supply Systems

NIKSA
Quality and Reliable System

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 Quality and Reliability

Your Business Partner

in DC Power Supply

The company’s expertise was built based

on our 15 years experience in the Power
Electronics field. Our aim is to provide our
customers with a consistent flow of power
without any disruption.

We manufacture a comprehensive range

of DC Power Supply, majority of which is
specifically custom-designed to meet most
industrial applications.

Our company has always placed great

emphasis in achieving and maintaining high
quality products through continuous stringent
quality inspection on all aspects of
manufacturing process in order to ensure all
our products are at the highest level of quality
and reliability before delivery to our customers.

We also have a team of capable commercial

and technical engineers with extensive field
experience gained over many years whom
can provide technical assistance from the
initial design to final phase of the project
as well as devising cost effective proposal
for all our customers.

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 Experience and Supply References

Petrochemical Industries, Onshore/

Offshore, Data processing monitor
Control System, Defence, Airport,
Hospital, Fire Alarm System, Turbine
Control, MRTC/Railway and Power
Station, Transmission/Distribution.

Most of our major customers have trust in

our products because we offer practical
and economical solutions for their choice
of equipment.

Customers’ Support and Services

➤ Initial project planning and

designing

➤ Delivery on site installation and/or

supervision by trained engineers.

➤ Attendance at the equipment start-

up and commissioning

➤ Customer training in practical for

operation and preventive
maintenance

Contents
Introduction
Rectifier Operating Principle
System Configuration
Standard Rectifier Specifications
Optional / Specific options
NSC Series Single-Phase
NTC Series Three-Phase

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 NIKSA Rectifier / Battery Charger

A mere split second of NIKSA rectifier consists of an input isolation

interrupted power could transformer, a full controlled thyristor set,

filtering circuit, control unit and alarm
spell disaster for customer
monitoring board which can supply power
and industries whose to batteries and DC loads simultaneously. A
operation depends on single phase rectifier employs two-pulse
constant power supply. controlled bridge whereas a full controlled
Based on years of thyristor set in six-pulse bridge is used in

experiences, NIKSA has three phase rectifier. A twelve-pulse

rectification reduces the level of Total
a range of chargers that
Harmonic Current Distortion (THCD) that
provide practical and will be affecting AC mains is available at
economical solutions to customer’s choice.
meet the vital
requirements.

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 During mains failure, power for the loads are battery operation and vice versa have no effect
provided by the system’s battery which is rated to whatsoever on the system output. Peak load
supply the DC load for the specific duration. Upon surpassing the rating of the rectifier will be supplied
restoration of the mains supply, the power flows from by the battery bank, which in floating condition, is
the battery is reversed and recharged under a automatically recharged each time when it delivers
constant voltage / current. Changes from rectifier to the current.

Operational block diagram

Transformer Power Converter Filter

Isolator

AC Supply Load

Isolated triggering

Rectifier voltage sensing Battery

Rectifier current sensing
Battery current sensing
Battery temperature compensation

Summary alarm
remote contact

Control Alarm
Display Additional remote alarm

Alarm input
Option : to be defined at ordering

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 System Configuration

Depending on the project specification, voltage tolerance, load and safety requirements, various
configuration might be selected to cope with customers’ requirements.

Single DC System
AC Supply

There are at least two charging rates:

Rectifier
1. float charge for normal use

2. high-rate charge for use when the batteries have

Battery
become discharged.

When the mains fail, battery takes over supply to the

DC Load
load.

System with dropping diode device

AC Supply

Rectifier connected to the load side, consists of a

Rectifier
DC voltage
number of diode groups, which are switched in or regulator
out of the circuit by a voltage sensing control.

The diode groups are made up of series-connected

silicon diodes, keeping the output voltage within the
Battery
specified tolerance. The electronic control unit of the
DC Load
dropping diode device is a stand-alone unit.

System with voltage regulator / voltage

AC Supply
compensator

In order to protect the sensitive load against the Rectifier

voltage variation during the boost mode operation,

the rectifier is designed with a DC-DC converter.

Battery
DC Load DC Load
(non-sensitive load) (sensitive load)

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 System Configuration

AC Supply
System with Off-Load Switch
Rectifier 1 Rectifier 2 This parallel redundant system provides 100%
standby power if rectifier and batteries are designed
Battery 1 Battery 2
for the full load. Two sections, each with one rectifier
and one battery bank, are connected to a common
bus bar and can operate independently or in
parallel. With the boost charge can take place in
DC Load one section, when isolated from the load with a
switch. At the same time, the other section will be on
floating charge and supplying to the load.

AC Supply
System with Boost Interlocking Facility

A parallel system consists of two rectifiers and

Rectifier 1 Rectifier 2
batteries rated at 100%. Under the normal condition,
the two rectifiers share load current and charges the
Battery 1 Battery 2
respective battery. With the boost interlocking
circuitry, batteries will automatically boost charge,
take place from one after the other. The interlocking
DC Load device precludes both rectifiers set to boost at the
same time.

AC Supply
Hot Standby System
Standby Unit
The DC system comes with two rectifiers and one
Rectifier
battery. One designated as “ Main” and the other as
“Standby”. The standby rectifier is always ready to
back up if the main rectifier fails. The Automatic
Battery
Switching Device will transfer the dc supply of the
standby unit to the failed rectifier without interruption
DC Load to the load.

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 Standard Rectifier Specifications

Single Phase System Three Phase System

Model NSC ....................................... Model NTC .......................................
Input AC voltage ............. V +/- 10% Input AC voltage .............. V +/- 10%
Input frequency 50 Hz or 60 Hz +/- 6% Input frequency 50 Hz or 60 Hz +/- 6%

Output
Rectifier output voltage 12V, 24V, 48V, 110V or 220V DC (nominal)
Float adjustment 80% to approx. 135% of V nominal
Boost/Hi-rate adjustment 80% to approx. 135% of V nominal
Output characteristic Constant voltage / current ( I/U as per DIN 41773)
Output voltage Stability Static +/- 1% with 10 - 100% load variation, input voltage of +/-
10% and input frequency of +/- 6%
Dynamic +/- 5% with 10 - 100% load variation. Recovery time to
static within typically 200 ms.
Current regulation < +/- 2% to I max.
Ripple filter < 2% Vr.m.s. with battery connected ( Bat. ≥ 5 x In )
RFI / EMC G according to VDE 0875 / EN 50081-2
Indications Rectifier On, Float and Boost LEDs

Environment
Operating temperature -10° to +40° C derate from 40° C to 55° C by lowering the
output current with 1.25% per ° C
Storage temperature -25° C to +70° C
Altitude Up to 1000m, derate from 1000 m to 5000 m by lowering the
output current with 6.7% per 1000 m.
Relative humidity operation from 0 - 95% (non- condensing )
Acoustic noise typically 45 - 65 dB(A)

Instrument
Rectifier output voltage voltmeter, 1.5% accuracy 90° deflection
Rectifier output current ammeter, 1.5% accuracy 90° deflection

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 Protection
Rectifier input Soft start function and Surge suppressor
Rectifier output protected against short circuit
Battery output polarity reversal of battery
Current limiting 105% of rated current

Rectifier Control
Rectifier input Input fuse / switch
Rectifier output DC output fuse
Battery Battery dc fuse
Charge mode Float/Auto/manual boost switch
Indication LED test button
Alarm Standard with manually reset button

Magnetic
High voltage insulation 2 KV AC for 1 minute between input / output and electrical earth
Insulation resistance 10 MOhms with 500VDC between input/output and electrical
earth

Mechanical
Paint finish Epoxy powder coat with chemical rust resisting primer
Colour RAL 7032, Light Grey
Degree of protection IP 20 according to IEC 60529

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 Optional / Specific options

To meet the specific needs of each applications, NIKSA Systems offers a wide range of options.
(Please tick / cross as appropriate)

❏ wide input range +................/-................% ❏ Fan fail

❏ higher Current limit .....................................% ❏ Fuse blown

❏ Mains auto change-over switch ❏ MCCB tripped

❏ filter 1% Vr.m.s w/o battery ❏ Battery discharged

❏ filter 0.1% Vr.m.s. w/o battery ❏ Charger overload

❏ Input EMI filter ❏ Low electrolyte level

❏ RFI to “N” level ❏ Cabinet over temperature

❏ 12-pulse rectifier w/ isol. transformer ❏ Battery disconnected

❏ rectifier input breaker ❏ Diode droppers fault

❏ rectifier output breaker/switch ❏ Audible buzzer

❏ battery fuse +/- in external fuse box ❏ Mimic diagram in front panel

❏ battery breaker /switch ❏ Individual remote alarm

❏ battery breaker in external box ❏ Battery temperature compensation

❏ battery breaker in EEx’d’ box ❏ Battery symmetry fault

❏ load output breaker ❏ AC fail with rectifier tripped

❏ Alarms ❏ High DC voltage trip

❏ Charger fail ❏ Low-volt-disconnect contactor

❏ Charger DC High / Low ❏ AC monitoring relay

❏ Load DC High / Low ❏ Additional analog meters

❏ Battery High / Low ..................................., ....................................

❏ DC earth fault ..................................., ....................................

❏ AC mains failure ❏ Digital metering for measurement

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 Optional / Specific options

Applicable Standards

❏ Transducer for measurements NIKSA power electronics and/or sub-assemblies

is designed and built according to the latest
..................................., ....................................
applicable sections of IEC standards.
..................................., ....................................

❏ Battery test facility IEC 60146 Semiconductor converter

IEC 60269 Low-voltage fuses
❏ Interior cabinet light
IEC 60445 Identification of apparatus terminals
❏ Cabinet space heater and general rules for a uniform system
of terminals marking, using an alpha-
❏ Redundant fans
numeric notation.
❏ Voltage droppers circuit, rated ......A
IEC 60478 Stabilized power supplies DC output
for output voltage range ......V +/- ....% IEC 60529 Classification of degree of protection
provided by enclosure (IP code)
❏ Boost inhibit upon battery room fans fail
IEC 60947 Low-voltage switchgear and control
❏ Remote communication RS 232
gear
❏ Protection IP ........( IP21 - IP5X ) IEC 60051 Electrical measurement instruments

❏ Open-door cabinet IP20 IEC 60076 Power transformers

IEC 60204 Electrical equipment of industrial
❏ Other colour RAL.................. or .....................
machines
❏ Top cable entry IEC 60228 Conductors of insulated cables

❏ Top and bottom cable entry IEC 60255 Electrical relays

IEC 60439 Low-voltage switchgear & control gear
❏ Earth bar
assemblies
❏ Flame retardent, low smoke, IEC 61010 Safety requirements for electrical
halogen-free wiring equipment for measurement, control
and laboratory use
❏ Special marking
EN 50081-2 Generic emission standards
❏ Stainless steel tag & name plates
EN 50082-2Generic immunity standards
❏ Customer cabinet ........... x ........... x ....... ....
(Please consult us for other manufacturing standards for specific
❏ Other manufacturing standard customer options)

(NEMA, ANSI...)

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 NSC Series - Single Phase Battery Charger

Output Output Input Input Dimension

Type voltage current power current (mm) Weight
norminal norminal

(Vdc) (Adc) (kVA) (Aac) W D H (Kgs)

NSC 12-3 12 3 0.12 0.48 400 270 460 13

NSC 12-6 12 6 0.20 0.88 400 270 460 15
NSC 12-10 12 10 0.32 1.41 400 270 460 17
NSC 12-15 12 15 0.48 2.07 400 270 460 20
NSC 12-20 12 20 0.63 2.73 430 330 610 25
NSC 12-25 12 25 0.78 3.39 430 330 610 30
NSC 12-35 12 35 1.08 4.71 500 380 790 35
NSC 12-50 12 50 1.54 6.70 500 380 790 40
NSC 12-75 12 75 2.30 10.00 670 490 1230 45
NSC 12-100 12 100 3.06 13.30 670 490 1230 92
NSC 12-125 12 125 3.82 16.61 670 490 1230 103
NSC 12-150 12 150 4.58 19.91 670 490 1230 113
NSC 12-175 12 175 5.34 23.22 670 490 1230 133
NSC 12-200 12 200 6.10 26.52 670 490 1630 150
NSC 12-250 12 250 7.62 33.13 670 490 1630 165

NSC 24-3 24 3 0.19 0.82 400 270 460 17

NSC 24-6 24 6 0.36 1.56 400 270 460 19
NSC 24-10 24 10 0.58 2.53 430 330 610 27
NSC 24-15 24 15 0.86 3.76 430 330 610 32
NSC 24-20 24 20 1.15 4.98 430 330 610 35
NSC 24-25 24 25 1.43 6.21 500 380 790 42
NSC 24-35 24 35 1.99 8.65 500 380 790 45
NSC 24-50 24 50 2.84 12.33 670 490 1230 95
NSC 24-75 24 75 4.24 18.45 670 490 1230 115
NSC 24-100 24 100 5.65 24.57 670 490 1230 130
NSC 24-125 24 125 7.06 30.68 670 490 1630 150
NSC 24-150 24 150 8.47 36.80 670 490 1630 185
NSC 24-175 24 175 9.87 42.92 840 625 1900 230
NSC 24-200 24 200 11.28 49.04 840 625 1900 265
NSC 24-250 24 250 14.10 61.28 840 625 1900 310

NSC 30-3 30 3 0.24 1.04 400 270 460 17

NSC 30-6 30 6 0.46 2.00 400 270 460 19
NSC 30-10 30 10 0.75 3.28 430 330 610 27
NSC 30-15 30 15 1.12 4.87 430 330 610 32
NSC 30-20 30 20 1.49 6.47 500 380 790 35
NSC 30-25 30 25 1.86 8.07 500 380 790 42
NSC 30-35 30 35 2.59 11.26 500 380 790 45
NSC 30-50 30 50 3.69 16.04 670 490 1230 95
NSC 30-75 30 75 5.53 24.02 670 490 1230 115
NSC 30-100 30 100 7.36 32.00 670 490 1630 130
NSC 30-125 30 125 9.20 39.98 670 490 1630 150
NSC 30-150 30 150 11.03 47.96 840 625 1900 185
NSC 30-175 30 175 12.87 55.93 840 625 1900 230
NSC 30-200 30 200 14.70 63.91 840 625 1900 265
NSC 30-250 30 250 18.37 79.87 840 625 1900 310

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 NSC Series - Single Phase Battery Charger

Output Output Input Input Dimension

Type voltage current power current (mm) Weight
norminal norminal

(Vdc) (Adc) (kVA) (Aac) W D H (Kgs)

NSC 48-3 48 3 0.34 1.50 400 270 460 20

NSC 48-6 48 6 0.67 2.91 400 270 460 24
NSC 48-10 48 10 1.10 4.79 430 330 610 24
NSC 48-15 48 15 1.64 7.14 430 330 610 39
NSC 48-20 48 20 2.18 9.49 500 380 790 80
NSC 48-25 48 25 2.72 11.84 500 380 790 83
NSC 48-35 48 35 3.80 16.54 500 380 790 90
NSC 48-50 48 50 5.43 23.59 670 490 1230 135
NSC 48-75 48 75 8.13 35.34 670 490 1230 200
NSC 48-100 48 100 10.83 47.09 670 490 1630 230
NSC 48-125 48 125 13.53 58.84 670 490 1630 250
NSC 48-150 48 150 16.24 70.59 840 625 1900 275
NSC 48-175 48 175 18.94 82.34 840 625 1900 295
NSC 48-200 48 200 21.64 94.09 840 625 1900 320
NSC 48-250 48 250 27.05 117.59 840 625 1900 400

NSC 110-3 110 3 0.73 3.15 400 270 460 25

NSC 110-6 110 6 1.43 6.22 400 270 460 30
NSC 110-10 110 10 2.37 10.31 430 330 610 45
NSC 110-15 110 15 3.55 15.42 430 330 610 80
NSC 110-20 110 20 4.72 20.53 500 380 790 90
NSC 110-25 110 25 5.90 25.64 500 380 790 125
NSC 110-35 110 35 8.25 35.86 670 490 1230 220
NSC 110-50 110 50 11.78 51.20 670 490 1630 250
NSC 110-75 110 75 17.65 76.75 670 490 1630 290
NSC 110-100 110 100 23.53 102.30 840 625 1900 340
NSC 110-125 110 125 29.41 127.86 840 625 1900 400
NSC 110-150 110 150 35.29 153.41 840 625 1900 460
NSC 110-175 110 175 41.16 178.97 840 625 1900 485
NSC 110-200 110 200 47.04 204.52 840 625 1900 510
NSC 110-250 110 250 58.80 255.63 840 625 1900 550

NSC 220-3 220 3 1.41 6.15 400 270 460 20

NSC 220-6 220 6 2.81 12.20 400 270 460 45
NSC 220-10 220 10 4.67 20.28 430 330 610 90
NSC 220-15 220 15 6.99 30.38 430 330 610 140
NSC 220-20 220 20 9.31 40.48 500 380 790 215
NSC 220-25 220 25 11.63 50.58 500 380 790 270
NSC 220-35 220 35 16.28 70.77 500 380 790 400
NSC 220-50 220 50 23.25 101.07 670 490 1230 500
NSC 220-75 220 75 34.86 151.55 670 490 1230 550
NSC 220-100 220 100 46.47 202.04 670 490 1630 625
NSC 220-125 220 125 58.08 252.53 670 490 1630 655
NSC 220-150 220 150 69.70 303.02 840 625 1900 690
NSC 220-175 220 175 81.31 353.51 840 625 1900 720
NSC 220-200 220 200 92.92 404.00 840 625 1900 750
NSC 220-250 220 250 116.15 504.98 840 625 1900 785

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 NTC Series - Three Phase Battery Charger

Output Output Input Input Dimension

Type voltage current power current (mm) Weight
norminal norminal

(Vdc) (Adc) (kVA) (Aac) W D H (Kgs)

NTC 12-25 12 25 0.78 0.97 670 490 1230 60

NTC 12-35 12 35 1.08 2.21 670 490 1230 70
NTC 12-50 12 50 1.54 3.13 670 490 1230 80
NTC 12-75 12 75 2.30 4.65 670 490 1230 100
NTC 12-100 12 100 3.06 6.17 670 490 1230 120
NTC 12-125 12 125 3.82 7.68 670 490 1230 135
NTC 12-150 12 150 4.58 9.20 670 490 1230 150
NTC 12-175 12 175 5.34 10.72 670 490 1230 175
NTC 12-200 12 200 5.34 12.24 670 490 1230 190
NTC 12-250 12 250 5.34 15.28 670 490 1230 220
NTC 12-300 12 300 6.10 18.32 670 490 1630 370
NTC 12-400 12 400 7.62 24.40 840 625 1900 480

NTC 24-25 24 25 0.69 1.81 670 490 1230 80

NTC 24-35 24 35 0.96 2.52 670 490 1230 100
NTC 24-50 24 50 1.36 3.58 670 490 1230 120
NTC 24-75 24 75 2.03 5.34 670 490 1230 185
NTC 24-100 24 100 2.70 7.10 670 490 1230 190
NTC 24-125 24 125 3.37 8.86 670 490 1230 200
NTC 24-150 24 150 4.04 10.62 670 490 1230 210
NTC 24-175 24 175 4.71 12.39 670 490 1630 230
NTC 24-200 24 200 5.38 14.15 670 490 1630 250
NTC 24-250 24 250 6.72 17.67 670 490 1630 385
NTC 24-300 24 300 8.05 21.19 670 800 1900 410
NTC 24-400 24 400 10.73 28.24 670 800 1900 525
NTC 24-500 24 500 13.41 35.29 840 625 1900 650
NTC 24-600 24 600 16.09 42.34 840 625 1900 720
NTC 24-700 24 700 18.77 49.38 840 800 1900 850
NTC 24-1000 24 1000 26.80 70.53 840 800 1900 1200
NTC 24-1200 24 1200 32.16 84.62 840 800 1900 1350

NTC 48-25 48 25 1.29 3.39 670 490 1230 125

NTC 48-35 48 35 1.80 4.73 670 490 1230 130
NTC 48-50 48 50 2.56 6.74 670 490 1230 150
NTC 48-75 48 75 3.83 10.08 670 490 1230 220
NTC 48-100 48 100 5.10 13.42 670 490 1230 245
NTC 48-125 48 125 6.37 16.76 670 490 1230 300
NTC 48-150 48 150 7.64 20.10 670 490 1630 380
NTC 48-175 48 175 8.91 23.44 670 490 1630 410
NTC 48-200 48 200 10.18 26.78 670 490 1630 420
NTC 48-250 48 250 12.72 33.47 670 800 1900 515
NTC 48-300 48 300 15.26 40.15 670 800 1900 555
NTC 48-400 48 400 20.34 53.52 840 625 1900 610
NTC 48-500 48 500 25.42 66.88 840 625 1900 720
NTC 48-600 48 600 30.49 80.25 840 800 1900 870
NTC 48-700 48 700 35.57 93.61 840 800 1900 950
NTC 48-1000 48 1000 50.81 133.71 940 800 1900 1270
NTC 48-1200 48 1200 60.97 160.44 1640 625 1900 1480

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 NTC Series - Three Phase Battery Charger

Output Output Input Input Dimension

Type voltage current power current (mm) Weight
norminal norminal

(Vdc) (Adc) (kVA) (Aac) W D H (Kgs)

NTC 110-25 110 25 2.76 7.27 670 490 1230 150

NTC 110-35 110 35 3.86 10.16 670 490 1230 170
NTC 110-50 110 50 5.51 14.49 670 490 1230 270
NTC 110-75 110 75 8.25 21.71 670 490 1230 400
NTC 110-100 110 100 10.99 28.92 670 490 1630 425
NTC 110-125 110 125 13.73 36.14 670 490 1630 455
NTC 110-150 110 150 16.48 43.36 670 800 1900 500
NTC 110-175 110 175 19.22 50.58 670 800 1900 520
NTC 110-200 110 200 21.96 57.79 670 800 1900 630
NTC 110-250 110 250 27.45 72.23 670 800 1900 720
NTC 110-300 110 300 32.93 86.67 670 800 1900 920
NTC 110-400 110 400 43.90 115.54 840 800 1900 1090
NTC 110-500 110 500 54.88 144.41 840 800 1900 1120
NTC 110-600 110 600 65.85 173.28 840 800 1900 1350
NTC 110-700 110 700 76.82 202.15 840 800 1900 1450
NTC 110-1000 110 1000 109.73 288.76 940 800 1900 1750
NTC 110-1200 110 1200 131.67 346.51 1640 800 1900 1890

NTC 220-25 220 25 5.42 14.26 670 490 1230 190

NTC 220-35 220 35 7.58 19.94 670 490 1230 210
NTC 220-50 220 50 10.82 28.46 670 490 1630 390
NTC 220-75 220 75 16.21 42.66 670 490 1630 490
NTC 220-100 220 100 21.61 56.87 670 490 1630 530
NTC 220-125 220 125 27.01 71.07 670 800 1900 570
NTC 220-150 220 150 32.41 85.28 670 800 1900 750
NTC 220-175 220 175 37.80 99.48 670 800 1900 810
NTC 220-200 220 200 43.20 113.68 670 800 1900 860
NTC 220-250 220 250 54.00 142.09 840 800 1900 1000
NTC 220-300 220 300 64.79 170.50 840 800 1900 1275
NTC 220-400 220 400 86.38 227.32 840 800 1900 1600
NTC 220-500 220 500 107.97 284.13 840 800 1900 1900
NTC 220-600 220 600 129.56 340.95 1840 800 1900 2200
NTC 220-700 220 700 151.15 397.76 1840 800 1900 2450
NTC 220-1000 220 1000 215.92 568.21 1840 800 1900 2680
NTC 220-1200 220 1200 259.10 681.84 1840 800 1900 2780

In order to maintain a policy of continuous improvement, NIKSA reserves the right to

change specifications without notice. All illustrations and descriptions in this brochure
are for guidance only and cannot be held binding upon NIKSA.

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 Avatec Power Pte Ltd
10, Ubi Crescent #07 - 79
Ubi Techpark Singapore 408564
Tel: 6749 1123 • Fax: 6841 3345
Email: avatec@singnet.com.sg
GST Reg No: 19-9703277-M

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