Sequence Of Operation, Programmed-Transition; Preferred Source Loss And Return, Programmed-Transition; Exerciser Operation, Programmed-Transition - Kohler MPAC 1500 Manual

3.7 Sequence of Operation,
Programmed-Transition
Programmed-transition models operate with a pause in
the off position during transfer. The time in the off
position is set through the off-to-standby and
off-to-preferred time delays.
3.7.1 Preferred Source Loss and
Return, Programmed Transition
Preferred Source Fails
1. Load control contacts open.
2. Engine start time delay expires.
3. The generator is signaled to start (engine start
contacts close).
4. The generator starts and the standby source
becomes available.
5. Preferred-to-standby time delay expires.
6. Contactor transfers to Off position.
7. Off-to-standby time delay expires.
8. Contactor transfers to standby source.
9. Post-transfer load control sequences run.
10. Load control contacts close.
Preferred Source Returns
1. Standby-to-preferred and pre-transfer load control
time delays expire.
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 generator is signaled to stop (engine start
contacts open).
28 Section 3 Operation
3.7.2 Exerciser Operation, Programmed
Transition
Unloaded Exercise
The unloaded exercise sequence is the same as for
standard transition. See Section 3.6.2.
Loaded Exercise Sequence Starts
1. Exerciser timer begins.
2. The engine start contacts close, signaling the
generator set to start.
3. The generator starts and the standby source
becomes available.
4. Preferred-to-standby time delay and pre-transfer
load control sequences run.
5. Load control contacts open.
6. Contactor transfers to Off position.
7. Off-to-standby time delay expires.
8. Contactor transfers to standby source.
9. Post-transfer load control sequences run.
10. Load control contacts close.
Emergency Source Fails (Normal Source is
available)
1. Exerciser is deactivated.
2. Immediate failure to acquire standby alarm.
3. Load control contacts open.
4. Contactor transfers to Off position.
5. Off-to-preferred time delay expires.
6. Contactor transfers to preferred source.
7. Post-transfer load control sequences and engine
cooldown time delay expire.
8. Load control contacts close.
9. Engine start contacts open.
TP-6714 4/10