GFC CONTROL CIRCUIT
To move the loco, field of Traction Alternator is to be excited by exciter generator. This work is done with the help of GFC contactor. It is electro magnetic contactor. To pickup this contactor GFC coil circuit is designed. This circuit starts from wire no. 13. When both control stand GFCO kept in close and MH closed (MH 1 – 8), the supply of wire no. 13 goes to wire no. 6 via wire no. 30E, 30C, and 30CC. Supply of wire no. 6 goes to GFC coil through following normally close interlocks
BKT (M) NCI 6-6A
ECS(R) NCI 6A-6B
GFOLR NCI 6B-6C
GR1 NCI 6C-6D
BKT (M) NCI 6D-6E
TR NCI 6E-6F
GF coil will energize by wire 6H positive and wire 4 negative and GFC contactor pick up.
Other than this following interlocks are provided parallel to BKT (M) & TR (NCI).
NOI of P32 (6D-6F), NOI of P2 (6D-6F) will close at the time of parallel transition.
MCO NOI (6D-6F) will close at the time of TM isolation.
