DC Battery Charger

Battery Charger is thyristor controlled, fully digital, static AC/DC rectifier with constant voltage / constant current characteristic. Galvanic isolation is provided with input transformer. Battery Charger is Scada ready through free contacts and communication features (Modbus protocol; RS-485 or TCP/IP port).

PMI Battery Chargers are widely used in different industries such as Power Generation, Power Distribution, Power Transmission, Manufacturing, Transportation, Mining, Oil & Gas with different applications such as Alarm, Control, Signal and Supply of DC Breakers in Power Plants, Substations, Switchgears, Railways and Offshore Plants


  • 6 Pulse (for 3 Phase)
  • Input Transformer for Galvanic Isolation
  • Front Panel with LCD Screen (2 Lines), LED Indication and MIMIC diagram
  • Digital Metering on LCD including, Input Voltage and Current (for 1 Phase), Battery Voltage and Current, Load Voltage, Charger Output Current
  • Redundant Supply for LCD
  • Separate Battery Charge Current and Output Current Adjustment via Current Transformer
  • Output LC Filter
  • Transient Surge Protection (via Varistor)
  • Input MCB with Auxiliary Contacts
  • Load and Battery MCB (up to 60A) with Auxiliary Contacts
  • Load and Battery NH Fuse (higher than 60A) with Auxiliary Contacts
  • Forced Ventilation with Smart Fan
  • Event History up to 250 Events
  • 8 Free Contacts
  • Automatic Online Battery Performance Test
  • Automatic and Manual Boost Function



  • 12 Pulse (3 Phase), THDi ≤ 10%, (PF) ≥ 0.85 Inductive
  • 12 Pulse (3 Phase) with Active Harmonic Elimination, THDi ≤ 5%, (PF) ≥ 0.95 Inductive
  • LCD Screen (4 Lines)
  • Digital Metering on LCD Input Current (for 3 Phase)
  • Analogue AC or DC Voltmeter and Ammeter
  • Dropper Diodes
  • DC/DC Converter (Can be used as a voltage stabilizer instead of dropper diodes)
  • LVD (Battery deep discharge protection contactor)
  • SCR Fuse (Semiconductor Fast Fuse)
  • Transient Surge Protection (via Surge Arrester)
  • Input, Load and Battery MCCB
  • Front Access Industrial Enclosure
  • Battery and Battery Charger Inside Same Enclosure
  • Natural Ventilation
  • Custom IP Protection
  • Custom Paint
  • Enclosure Heater and Lighting
  • Internal or External Distribution
  • Forced/Active Load Sharing in Parallel Configuration
  • Battery Temperature Compensation
  • 8 Free Contacts (Configurable via Communication interface)
  • Communication (PC Remote, Modbus, SNMP, Profibus, DNP 3.0 via RS 232, RS 485 or Ethernet TCP/IP ports)
Model RDA / RDAT series
Topology Full Bridge Phase Angle Controlled Thyristor Module Rectifier
Control Microprocessor Controlled System
Input Isolation TransformerGalvanically isolated / Primary & Secondary Earth Screened
Nominal Voltage and Tolerance 110/127/190/200/220/230/240/380/400/415/480 VAC ±15% (1 Phase or 3 Phase)
Nominal Frequency50 Hz / 60Hz ±5%
Cosφ≥ 0.8 Inductive (6 Pulse) ≥ 0.85 Inductive (12 Pulse) ≥ 0.95 Inductive (12 Pulse with active harmonic elimination)
Total harmonic Distortion (THDi)≤ 30% (6 Pulse), ≤ 10% (12 Pulse), ≤ 5% (12 Pulse with active harmonic elimination)
Input ProtectionInput: Thermic-Magnetic Over Current Protection, Over Voltage Protection, Phase Sequence Free Operation (3 Phase), Soft Start, MCB
Battery Charging Principle Constant Current/ Constant Voltage
Rated PowerDepends on DC voltage and Current
Nominal Output Voltage12 / 24 / 48 / 110 / 125 / 220 / 264 / 360 / 450 / 900VDC
Output Current Adjustment0-100% of Nominal Output Current
Static Tolerance±0.5% (Lower values available upon request)
Output Voltage Ripple RMS≤ 1% RMS AC of Output Voltage
Boost voltage (V/C)2,4 lead acid battery 1,60 NiCd Battery (Depends on battery manufacturer recommendation)
Float voltage (V/C)2,23 lead acid battery 1,40 NiCd battery (Depends on battery manufacturer recommendation)
Dynamic Response Time and Voltage Variation<50msec, <+/-5% (for 10% – 100%, 100% – 10% step load change)
Battery TestAutomatic or manual selectable. Please refer to user manual for details
Boost Timer0 – 99,9 hours adjustable by 1 minute accuracy
Current LimitationTotal output current and battery current can be adjusted separately
Open or closed free alarm contacts “Low Battery, Mains Input Normal / Failure, Charger Failure, Overtemperature, Charger Overvoltage, Load MCB ON/ OFF, Battery MCB ON / OFF, Earth Fault”
MeasurementsLCD Display for Line Voltage / Frequency / Current (Standard in 1 Phase, Optional for 3 Phase), Battery Output Voltage / Current, Load Output Voltage, Charger Total Output Current
IndicatorsFloat Mode, Boost Mode, Current Mode, Equalize Mode, Battery Ending, Low Battery, Battery Test Failure, Line Failure, Fan Failure, Over Voltage, Under Voltage, Over Temperature, Rectifier Failure, SCR Fuse Failure, Mains Available, Load MCB, Battery MCB
Adjustable ParametersFloat Charge Voltage, Boost Charge Voltage, Equalize Charge Voltage, Battery Charge Current, Rectifier Total Output Current, Low Battery Voltage Alarm, Earth Fault Leakage Current Alarm (only available in 4 line LCD), Battery Ending Voltage Alarm, Online Battery Test Parameters, Auto Boost Charge Parameters, Password
Event HistoryLast 250 events recorded and displayed on front panel and on PC via remote communication
Sound AlarmOn Warning Messages 2 Short ‘beep’ per 2 seconds
Communication (OPTIONAL)RS 485 / RS 232 / Ethernet Ports, Remote PC Control, Modbus, Profibus, SNMP, DNP 3.0 Protocols and TCP/IP options
Paralleling (OPTIONAL)Redundant Operation of Dual Chargers with Forced (Active) Load Sharing Option
LVD (OPTIONAL)Protection of Battery from Deep Discharge via Contactor. Available on request
Dropper Diodes (OPTIONAL)Dropper Diodes for Float and Boost Voltage Regulations. Available on request
Circuit BreakersInput: Miniatur circuit breakers; Output: Miniatur circuit breakers / NH Fuse; Battery: Miniatur circuit breakers / NH Fuse
Over Voltage ProtectionIEEE 587 4500 A, 110 Joules (standard) / 40kA Surge Arrestor (OPTIONAL)
Electrical Interference Reduction FCC Part 15 Class B
Electrical StandardsEN 50091-1 (Security) / EN 50091-2 (EMC)
Protection Level / Color IP 20 / RAL 7035 (Standard), (Higher IP rating and different colors are available, please consult)
Isolation Voltage2000VAC input/chassis and output/chassis
MTBF 100,000 hrs. (w/out battery group)
Enclosure Material Mild Steel, Zinc-phosphate coated; 100 µm electrostatic paint; 1.5 mm thickness
Cooling Forced fans / Natural (optional)
Cable Entry Bottom / Top (optional)
Heater & LightningOPTIONAL
Operating Temperature -10 / +40 °C. Higher operating temperatures are available, please consult
Relative humidity 0 – 90%
Operating Altitude Max. 1000 Mt. (Higher altitudes requires de-rating, please consult )
Noise Level Max. 65 db

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