TP-6714 4/10 31Section 3 Operation
Loaded Exercise Sequence Ends
1. Pre-transfer load control sequences run.
2. Load control contacts open.
3. Source 2 circuit breaker opens.
4. Off-to-preferred time delay expires.
5. Source 1 circuit breaker closes.
6. Post-transfer load control time delays expire and
load control contacts close.
7. Engine cooldown time delay expires.
8. The engine start contacts open, signaling the
generator to stop.
3.8.3 Test Sequence,
Service Entrance Models
Unloaded Test Sequence
The unloaded test sequence is the same as for standard
transition. See Section 3.6.3.
Loaded Test Sequence is Initiated (Loaded)
1. The engine start contacts close, signaling the
generator set to start.
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. Source 1 circuit breaker opens.
6. Off-to-standby time delay expires.
7. Source 2 circuit breaker closes.
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. Source 2 circuit breaker opens.
5. Off-to-preferred time delay expires.
6. Source 1 circuit breaker closes.
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. Source 2 circuit breaker opens.
4. Off-to-preferred time delay expires.
5. Source 1 circuit breaker closes.
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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