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TP-6905 6/1428 Section 2 Generator Set Operation
2.7.2 ATS Control Sequence of
Operation
See Figure 2-8 for time delay settings.
Normal Source Fails:
1. The load control contact opens.
2. The engine start time delay times out.
3. The generator set is signaled to start.
4. The generator starts and the emergency source
becomes available.
5. The normal-to-emergency time delay times out.
6. The transfer switch transfers to the emergency
source.
7. The load control contact time delay times out.
8. The load control contact closes.
Normal Source Returns:
1. The emergency-to-normal time delay times out.
2. The contactor transfers to the normal source.
3. The engine cooldown time delay times out.
4. The generator is signaled to stop.
2.7.3 Time Delays
Time delays are factory-set to the values shown in
Figure 2-8. An authorized distributor/dealer can adjust
time delays using a personal computer and Kohlerr
SiteTecht software.
Time delays described in this section operate only when
the controller is connected to a Kohlerr Model RXT
transfer switch.
The engine start and load transfer time delays prevent
engine start and load transfercaused by brief variations
in the utility power source.
2.7.4 ATS Load Control Relay Time
Delay
The load control time delay allows delayed starting of
large motor loads (such as air conditioners), preventing
simultaneous starting of large motors after transfer to
the generator set. The load control time delay is fixed at
5 minutes. It is not adjustable.
The load must be connected to the load control output
on the interfaceboard ofthe ModelRXT transfer switch.
See the transfer switch operation and installation
manual for connection instructions.
Time Delay Setting Description
Engine Start 3 seconds Time delay after utility source is lost until the engine start cycle begins.
Guards against starting the generator set because of a brief change in
the utility source.
Transfer, Normal to Emergency 3 seconds Time delay after emergency source becomes available until transfer to
emergency source.
Transfer, Emergency to Normal 2 minutes Time delay after the utility source returns until transfer back to normal.
Ensures that the the utility source is stable before transferring from the
emergency source.
Load Control 5 minutes See Section 2.7.4. Allows delayed connection of selected loads to the
generator set to prevent simultaneous starting of large motors after
transfer to the emergency source. Recommended for delayed starting
of air conditioners.
Figure 2-8 Time Delays