TP-6745 7/1052 Section 3 Controller Test and Replacement
GM71059
Transfer, Normal to Off:
Utility source is lost. Controller relay
K2 closes, energizing M to open the
utility source circuit breaker.
Transfer, Off to Emergency:
After the Off time delay, controller relay K2
closes, energizing M to close the generator
circuit breaker.
Note: The K1 and K2 relays on the MPAC 1500
controller board are energized for only 250
milliseconds to initiate transfer.
Figure 3-8 MCCB Transfer from Normal to Emergency
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