TP-6714 4/10 29Section 3 Operation
Loaded Exercise Sequence Ends
1. Pre-transfer load control sequences run.
2. Load control contacts open.
3. Contactor transfers to Off position.
4. Off-to-preferred time delay expires.
5. Contactor transfers to preferred source.
6. Post-transfer load control sequences and engine
cooldown time delay expire.
7. Load control contacts close.
8. The engine start contacts open, signaling the
generator to stop.
3.7.3 Test Sequence, Programmed
Transition
Unloaded Test Sequence
The unloaded test sequence is the same as for standard
transition. See Section 3.6.3.
Loaded Test Sequence is Initiated
1. The generator is signaled to start (engine start
contacts close).
2. The generator starts and the standby source
becomes available.
3. Pre-transfer load control time delays expire and
load control contacts open.
4. Preferred-to-standby time delay expires.
5. Contactor transfers to the Off position.
6. Off-to-standby time delay expires.
7. Contactor transfers to standby.
8. Post-transfer load control time delays expire and
load control contacts close.
Emergency Source Fails (Normal Source is
available)
1. Test function is deactivated.
2. Immediate failure to acquire standby alarm.
3. Load control contacts open.
4. Contactor moves to the Off position.
5. Off-to-preferred time delay expires.
6. Contactor transfers to preferred.
7. Post-transfer load control sequences and engine
cooldown time delay expire.
8. Load control contacts close.
9. Engine start contacts open.
Loaded Test Sequence is Ended
1. Standby-to-preferred time delay and pre-transfer
load control sequences run.
2. Load control contacts open.
3. Contactor moves to the Off position.
4. Off-to-preferred time delay expires.
5. Contactor transfers to preferred.
6. Post-transfer load control sequences and engine
cooldown time delay expire.
7. Load control contacts close.
8. The engine start contacts open, signaling the
generator to stop.
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