Traction Rolling Stock - Indian Railways Institute of Electrical ...

The ventilating fans for the whole unit are fed from two unit lines 29 and 30,energised
from a double-pole fan contactor which is under the control of the guard. The contactor is of the
latched type, and only momentary pulse from the FANS ON and FANS OFF buttons in the driving
trailer cab are required to operate it. The two fan circuits are protected by fuses VF1 and VF2 or
MCB.
10.5.5 Battery circuits (Ref. fig.10.5.5)
The battery positive and negative connections are taken through battery fuses BF1 and
BF2, to the battery-isolating switch. This is a 200A1double-pole rotary switch having four positions
OFF, NORMAL, OFF and CHARGE. In either of OFF positions the battery is completely isolated.
In the CHARGE position the battery is connected to the charging socket in the emergency cab,
thus allowing it to be charged from an external supply.
In NORMAL position the battery is connected to wires DIG and GD, supplying the
auxiliary compresssor, the emergency lights and the control circuits. The static battery charger
feeds the battery on energisation of 266V ac auxiliary circuit.
10.6 AUXILIARY COMPRESSOR MOTOR
This is protected by fuse MCB and is controlled by auxiliary compressor contactor CC2.
Contactor CC2 is fed from the control positive via a miniature circuit breaker. The auxiliarycompressor
governor is provided with a sealed switch GS4 which can be closed in the event of
failure of governor. The function of the interlock ABR/1 is to isolate the auxiliary compressor circuit
whenever the air-blast circuit-breaker is open.
10.7 EMERGENCY LIGHT
The two emergency lighting circuits are fed direct from the battery.
10.7.1 The emergency head and tail lights are supplied through the emergency head and tail
lights fuse EHTF, and a contact on the emergency head and tail lights relay. If the supply to the
normal head and tail lights fail the relay opens and lights the emergency head and tail lamps.
10.7.2 The emergency coach lights are fed through the emergency lights fuse ELF, and one
pole of the double-pole lighting contactor which is under the control of the guard . The feed is also
taken through contacts of the emergency lighting relay so that if the supplies to the main lighting
circuits fail, the relay will open and the emergency lights will be lit.
The emergency coach lighting circuits are the same on all coaches in the unit, each coach having
its own relays controlling its own emergency lighting.
10.8 CONTROL CIRCUIT SUPPLY
The supply to all control circuits on the unit is fed through the control fuse CF to unit wire
14. The auxiliary compressor-governor circuit and the LT voltmeter are also fed through this fuse.
10.9 MAIN LIGHTS