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Products - Operation & Maintenance Manual
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Battery Health Monitoring
Operation & Maintenance
     Manual -
bullet General Safety Measure
bullet Pre-Commissioning
Checks & Commissioning Procedure
bullet General Description of
Front Panel of The Charger
bullet Typical Specification of
The Chargers
bullet Functional Description of
Different Chargers
bullet Description of
Annunciation & Protection
bullet Maintenance Procedure
& Schedule
bullet Trouble Shooting
Functional Description of Different Chargers


The system consists of two numbers identical float cum boost charger (CH-I & CH-II). Two identical float cum boost chargers are connected in battery and load circuit thru’ a mode selector switch in such a way that one charger supply the DC load and the other charger kept as a boost charging mode or parallel with the other charger in float mode.

If battery require boost charging, then one of the charger (selectable thru’ mode selector switch) start boost charging automatically and after termination of boost charging the charger changes its mode from boost to standby mode or float mode automatically.

The DC contactor will isolate the load bus from the battery bus to prevent the load circuit from the higher voltage of Battery bus during boost mode operation.

Both the chargers can be operated in manual mode by selecting the Auto/Manual selector switch ASW01F (A)/B in manual position output voltage / current can be varied by operation of potentiometer.



This system consists of a Float charger and a Boost charger. In this system the battery will normally float across the float charger so that in case of power failure the battery can maintain the load without interruption.

However, after heavy discharge of battery, the battery is placed on boost mode of operation. At that time load is taken care by float charger and boost charging is done by Boost charger. Now if supply fails, the battery will be connected to the load bus through the DC contactor and take care of the load.

During normal operation the tap cell diode will be reverse biased. In the event of power failure during boost charging (with battery isolated), the output voltage will start dropping. As soon as it drops slightly lower than the cell voltage the diode will conduct thereby maintaining the voltage at the load bus (though lower in magnitude) to avoid complete interruption of load supply. However, after this brief interval, the DC contactor will energize thereby connecting the battery to the load bus and restricting the original load voltage. This arrangement provides an uninterrupted DC supply to the load.



The system consists of a Float Charger and a Float cum Boost Charger.

The primary function of the Float charger is to supply the connected DC load and simultaneously trickle charge the floating battery bank to keep it in fully charged state, so that it can supply the load during power failure or any problem in input supply.

The Float cum Boost charger (FCBC) has a dual function. The main function of this charger is to quick charge the battery after a heavy discharge and restores it to its full capacity within the shortest possible time & will operate in float mode when main Float charger fail/switch off.

Normal operation of the system will be such that the Float charger will supply the DC load and Trickle charge the floating battery bank. But when boost charging is required by the battery then it will be done by the float cum boost charger. The system is adequately protected by input and output switch/fuse and associated fault monitoring protection and annunciation modules.



The system can be operated either in float mode or in boost mode. The float mode is meant for supplying the DC continuous load and at the same time, trickle charging the battery to keep it in fully charged condition.

The Boost mode is basically meant for quick charging the battery after a heavy discharge, so as to restore the capacity of the battery within minimum time. At this time load will be fed thru’ dropper diode.

The charger may also be operated either in auto or in manual mode. In the manual mode the output voltage/current may be varied within the limits by external potentiometer(s). In auto mode the output voltage is held constant at a preset value.


The chargers described above can be operated either in manual mode by selecting the Auto/Manual selector switch in manual position and the output voltage/current can be varied by operation of respective potentiometers, or in auto mode by placing the selector switch in auto position.

  • AUTO MODE: -
    • Output of the charger is pre selected to a fixed value at constant voltage mode for float operation.
    • In boost mode it is pre selected at constant current.

    • Output of the charger can be varied from minimum to a maximum voltage by operating the external potentiometers for float mode
    • Zero to a maximum value of current at boost mode.