Kohler 60RCL, 38RCL, 48RCL Exercise, Automatic Operation with Model RDT or RSB Transfer Switches

Automatic Stop

1.When the utility source is restored, the Emergency-to-Normal time delay starts.

2.When the Emergency-to-Normal time delay expires, the load is transferred to the utility.

3.The generator set stops.

2.4.7Automatic Operation with Model RDT or RSB Transfer Switches

If a Kohler Model RDT or RSB transfer switch is used, the engine start contacts from the ATS must be connected to engine start leads 3 and 4 on the generator set.

The RDC2 generator set controller must be in AUTO mode to respond to remote start/stop signals from an ATS or remote switch. Press the AUTO button on the RDC2 controller to put the generator set into automatic mode.

Automatic Start

The engine start contacts on the ATS close to signal the generator set to start, and remain closed while the generator set is running.

Automatic Stop

The engine start contacts on the ATS open to signal the generator set to stop.

2.5 Exercise

The RDC2 controller can be set to automatically run the generator set at the same time and day every week or every other week. Exercising the generator set every week or every two weeks is required in order to keep the engine and alternator in good operating condition.

Three exercise modes are available: unloaded cycle, unloaded full speed, and loaded full speed. See Sections 2.5.1 through 2.5.3 for information about the exercise modes. A loaded exercise can be set at the RDC2 controller only if a Model RXT transfer switch is connected.

Note: With the RDT and RSB transfer switches, it is possible to have two exercise settings (one unloaded exercise set at the generator set controller, and another exercise set at the ATS controller). If the exercise times overlap, the ATS exercise setting takes priority.

If a Model RDT or RSB transfer switch is used, refer to the instructions provided with the transfer switch to set a loaded exercise at the ATS, if desired.

2.5.1Unloaded Cycle Exercise with Complete System Diagnostics

An unloaded cycle exercise runs the generator set without signalling the transfer switch to transfer the electrical load from the utility source to the generator set. The Unloaded Cycle exercise with diagnostics is the recommended exercise mode and is the factory-default exercise setting.

The Unloaded Cycle exercise runs the engine for 20 minutes in the cycle shown in Figure 2-1 and described below.

DRuns at reduced speed for 10 minutes to warm up and exercise the engine.

D Ramps up and runs at full speed for 3 minutes. Engine diagnostics are performed during this full-speed portion of the cycle, which provides the best test of engine and alternator power backup capability. Diagnostic tests at full speed can identify potential problems with the power output and alert the operator before an emergency event.

D Ramps down and runs at reduced speed for 5 minutes to cool down the engine before shutting down automatically.

Speed, RPM		3 min.
		1 min.	1 min.
Engine	10 min.		5 min.
	Engine	Full-Speed	Cooldown
	Exercise	Diagnostics

Figure 2-1Unloaded Exercise Cycle

System Diagnostics

During the unloaded cycle exercise, the controller monitors the following data. The controller display indicates an unloaded exercise run during the diagnostics, unless a fault is detected as described below.

TP-6810 11/13 Section 2 Generator Set Operation 17