TP-6745 7/10 55Section 3 Controller Test and Replacement
GM71061
Transfer, Emergency to
Off:
Utility power returns.
PTIB relay K1’ closes,
energizing the GBO
motor operator to open
the generator breaker.
Note: Controller relays K1 and K2 and PTIB
relays K1’ and K2’ are energized for only
250 milliseconds to initiate transfer.
Transfer, Off to Normal:
Controller relay K1
closes, energizing the
UBC motor operator to
close the utility breaker.
Figure 3-11 ICCB Transfer from Emergency to Normal
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