TP-6745 7/10 53Section 3 Controller Test and Replacement
GM71059
Transfer, Emergency to Off:
Utility source returns. Controller relay K1 closes,
energizing M to open the generator circuit breaker.
Transfer, Off to Utility:
Controller relay K1 closes, energizing M to close
the utility circuit breaker.
Note: The K1 and K2 relays on the MPAC 1500
controller board are energized for only 250
milliseconds to initiate transfer.
Figure 3-9 MCCB Transfer from Emergency to Normal
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