Kohler 60RCL ATS Control Sequence of Operation, Time Delays, ATS Load Control Relay Time Delay

2.7.2ATS Control Sequence of Operation

See Figure 2-8 for time delay settings.

Preferred 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.

2.7.3Time 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 transfer caused by brief variations in the utility power source.

2.7.4ATS 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 interface board of the Model RXT 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

26 Section 2 Generator Set Operation TP-6810 11/13