Electrical Operation Test - Kohler MMS Service And Parts

7. If the emergency source is not at rated voltage,
adjust the generator voltage regulator following the
generator set manufacturer's instructions. The
automatic transfer switch will respond only to rated
voltage and frequency specified on the nameplate.
Check phase rotation; it should be the same as that
of the normal source.
8. Shut down the generator set using the engine
control switch on the generator set controller.
Remove the normal source and reconnect the
power switch device control in-line disconnect
plugs. See Figure 2-5. Wait until the time delay
engine cooldown (TDEC, if equipped) has
completed timing per the factory setting. After the
TDEC has completed timing, the generator set
controller's engine control switch can be placed in
the AUTO position.

Electrical Operation Test

9. Place the transfer switch in the Normal position.
The following procedure will check the electrical
operation of the automatic transfer switch.
10. Place the Test switch (if so equipped) in the TEST
position. See Figure 2-1. The generator set will
start and run after the Time Delay Engine Start
(TDES) relay times out.
2-6 Operation
11. The transfer switch will transfer to the emergency
position. The transfer will occur after the
Normal-to-Emergency Time Delay (TDNE) relay
times out.
12. Move the door-mounted test switch back to the
normal position. The transfer switch will retransfer
to normal after the emergency-to-normal time
delay relay times out.
13. Time Delay Engine Cooldown (TDEC) allows the
engine to continue running without load for an
additional period. The transfer switch TDEC will
complete timing before any TDEC function in the
generator set controller begins timing.
14. Close load circuit breaker(s) when loads may be
energized.
If you connect the transfer switch in-line disconnect
plugs (P1) together while the generator controller's
master switch in the AUTO position, the generator
set will IMMEDIATELY start and run until the
generator set controller's cooldown timer has
completed timing.
This completes functional tests of the transfer switch.
Place the generator set starting control in the automatic
position.
NOTE
TP-5670 9/94