‘Amara Raja Power Systems Limited GENERAL DESCRIPTION OF CELL BOOSTER The cell charger consists of one Double Wound charger input transformer, charger control Board, SCR/Diode Rectifier circuit, Blocking Diode, Voltage and current adjust Pots in PCB and AC input and DC output circuit breakers. The spare cell Charger is manufactured utilizing SCR/Diode Blocks. The DC Output voltage regulation and over load drooping characteristics are achieved by carefully determining the precise moment to fire the SCRs by supplying the proper gate pulses. This fimction is achieved by charger control Board-PC 1 The Charger works on 240V AC, single phase S0Hz supply. The Charger is capable of delivering the full rated current at the specified voltage at output terminals. This voltage is maintained for an input voltage variation of 240V + 10% and load current variation from 10-100% at full load. The charger charges the cells by adjusting the voltage and current to the required level by using the potentiometers in Pot Board PC 3. All these circuits are housed in a single cabinet of free standing steel construction . All the meters, indications ,AC input and DC output breakers are provided on the front panel. Termination for AC input, DC output are provided at the front Panel of the cabinet for easy accessibility. APL.-40_5200006480-REV.0, Date: 29.08.2022. Page 3 0f 5‘Amara Raja Power Systems Limited 1 2, 4. 5, 6 TECHNICAL SPECIFICATION OF THE CELL BOOSTER RATING : AC INPUT a. Voltage b, Frequency ¢. Phase DC OUTPUT: a. Voltage b. Ripple ¢. Current METERS INDICATIONS, CONTROLS & SWITCHES GENERAL. a. Cabinet b. Paint c. Protection d. Cooling ‘Temperature range: of operation f Relative humidity : APL.-40_5200006480-REV.0, Date: 29.08.2022. 12V/40A CELL BOOSTER 240VAC 10% S0Hz+ 5% Single Phase 12 5 % RMS with Battery Connected Max, 40A Following Analog Type Measuring Meters of 96 X 96 mm with 90° deflection and 1.5% accuracy will be provided in the system for measuring the respective parameters: AC Voltmeter DC Voltmeter DC Ammeter. Cluster LED Lamps will be provided for the following conditions: AC Input available DC Output available AC Input CB DC Output CB Portable steel cabinet Cable entry at bottom. RAL-7035 Ip-42 Natural air cooling 50°C 0% to 95% non-condensing, teens Page 4 of 5‘Amara Raja Power Systems Limited CELL BOOSTER THEORY The Spare cell Charger is designed to charge the Spare cells. Voltage and current regulation is achieved by employing a Control Circuit Board circuit. PC 1 does the function of voltage regulation, current regulation output current limiting .All the indications and meterss are brought on the Front Panel for voltage and current indications. Three meters mounted on the Front Panel to indicate AC Input Voltage,charger output voltage and charger output current. For clear understanding of system description, refer enclosed Schematic Drawing. The Single phase input AC supply is connected through Circuit Breaker to the Charger Inut Transformer (T 1) and control transformer (T 2). The secondary of the Transformer (T 1) is connected to Reetfier Bridge (SCR/V1-2) through a Fuse F1, The secondary of the transformer ( T 2) is connected to the charger control circuit Board (PC 1) and Power Supply Board (PC 2), This control card PC 1 fires charger SCRs (SCR 1 & SCR 2) slowly initially for DC soft start and and transients at AC controls the phase angle depending upon the output voltage of the Charger. Voltage and current can be adjusted to the required level by using the front panel potentiometers in Pot Board PC 3. PC 4 is the Snubber Board that protect the system from surges Input DC Output is connected to inductor LI and Capacitor C1 which in turn filters out all Blocking Diode (V 4) harmonies and provide DC voltage with low ripple content as specific prevents the reverse current flow into the Charger, Shunts SH 1 provide Charger current feedbacks respectively to PC 1 for current regulation. DC Voltmeter (P 3) measure the DC output and DC Ammeter (P 2) measures the charger output current, AC Voltmeter (P 1) is used to monitor AC Input Voltage. The charger is provided with different indications for continuous monitoring of the system operation, All these indications are provided on the front panel. APL.-40_5200006480-REV.0, Date: 29.08.2022. Page 5 of 5