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SECTION 1.7
AUTOMATIC OPERATING PARAMETERS
PART 1
GENERAL INFORMATION
Page 1.7-2
AUTOMATIC
OPERATING
SEQUENCES
CHART
SEQ. CONDITION ACTION SENSOR, TIMER OR OTHER
1 Utility source voltage is No action Voltage Dropout Sensor on circuit
available. circuit board.
2 Utility voltage dropout below A 15-second timer on circuit Voltage Dropout Sensor and 15
60% of rated voltage occurs. board turns on. second timer on circuit board.
3 Utility voltage is still below 15-second timer runs for 15 Voltage Dropout Sensor and 15
60% of rated voltage. seconds, then stops. second timer.
4 Utility voltage is still low after Circuit board action energizes a Circuit board crank and run
15 seconds. crank relay and a run relay. relays.
See NOTE 1.
5 Utility voltage still low and Circuit board s engine warmup Engine Warmup Timer (10 seconds)
the engine has started. timer runs for 10 seconds.
6 Engine running and engine Circuit board action energizes a Circuit board transfer relay circuit
warmup timer times out. transfer relay in transfer switch Transfer switch transfer relay.
AC output voltage above and transfer to Standby occurs.
50% nominal voltage.
7 Engine running and load is No further action Circuit board voltage pickup
powered by Standby power. sensor continues to seek an
acceptable Utility voltage.
8 Utility source voltage is Circuit board voltage pickup Voltage Pickup Sensor (80%)
restored above 80% of rated sensor reacts and a re-transfer Return to Utility Timer (15 seconds)
time delay turns on.
9 Utility voltage still high after 15 Return to Utility Timer times out Return to Utility Timer
seconds.
10 Utility voltage still high. Circuit board action opens the Circuit board transfer relay circuit
transfer relay circuit to ground. Transfer switch transfer relay.
Transfer relay de-energizes and
retransfer to Utility occurs.
11 Engine still running, loads are Circuit board engine cool down Circuit board Engine Cool down
powered by Utility source. timer starts running. Timer (1 minute)
12 After 1 minute, engine cool down Engine Cool down Timer
timer stops and circuit board s Circuit board Run Relay.
run relay de-energizes. Engine
shuts down.
13 Engine is shut down, loads are No action. Voltage Dropout Sensor on circuit
powered by Utility source. circuit board.
Return to Sequence 1.