2.4 Exercise

The RDC2 and DC2 controllers can be set to automatically run the generator set at the same time and day each week. Exercising the generator set weekly or every two weeks is required 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 2.4.2 through 2.4.4 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.

2.4.1Setting the Exerciser

When power is applied to the RDC2 controller (that is, when the battery is connected), you will be prompted to set the date and time, and then to set the exerciser.

The first setting will flash. Press the Up and Down arrow buttons to change the setting. Press Select to save the setting and move on to the next. See Section 3.5 for more detailed instructions to change settings on the RDC2. See Section 3.6 for more detailed instructions to set the exerciser or change the exercise settings.

The DC2 controller does not prompt you to set the exerciser. See Section 4.5 for instructions to set the exerciser on the DC2.

2.4.2Unloaded Cycle Exercise with Complete System Diagnostics

An unloaded 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 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.

DRamps 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.

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

RPM

 

3 min.

 

 

 

 

Speed,

 

1 min.

1 min.

 

 

 

Engine

10 min.

 

5 min.

 

 

 

Engine

Full-Speed

Cooldown

 

Exercise

Diagnostics

 

Figure 2-1 Unloaded Exercise Cycle

System Diagnostics

During the unloaded exercise, the controller monitors the following data. The controller display indicates that the generator set is running, unless a fault is detected as described below.

D ATS connection. The controller verifies that the Model RXT ATS interface board is connected.

D Battery voltage. Battery voltage is checked before exercise to verify engine starting capability. Battery voltage provides a measurement of battery health. If the controller detects low battery voltage, the condition is indicated on the display.

D Communication integrity tests. J1939, RBUS, Ethernet, and USB are monitored for messages indicating that the controller and wiring are reliable.

D Engine speed. Engine speed is measured at reduced speed and full speed. An overspeed or underspeed condition will result in a fault condition and shutdown.

D Generator output frequency and voltage. Operating the generator at full speed allows the

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Section 2 Generator Set Operation 23

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Kohler 14/20RESAL manual Setting the Exerciser, Unloaded Cycle Exercise with Complete System Diagnostics
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14/20RESAL, 14/20RESA specifications

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