Exercise; Unloaded Cycle Exercise With Complete System Diagnostics - Kohler 24RCLA Operation

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 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 transfer switch is used, refer to the
instructions provided with the transfer switch to set a
loaded exercise at the ATS, if desired.
2.5.1 Unloaded 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.
Runs at reduced speed for 10 minutes to warm up
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and exercise the engine.
Ramps up and runs at full speed for 3 minutes.
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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.
Ramps down and runs at reduced speed for
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5 minutes to cool down the engine before shutting
down automatically.
TP-6905 9/21
1 min.
10 min.
Engine
Exercise
Figure 2-1 Unloaded 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.
ATS connection. The controller verifies that the
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Model RXT ATS interface board is connected.
Battery voltage. Battery voltage is checked before
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exercise to verify engine starting capability. Battery
voltage provides a measurement of battery health. If
the controller detects low battery voltage, low battery
or low charging battery is displayed and the exercise
does not start.
Coolant level check. The coolant level is checked.
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Communication integrity tests. J1939, RBUS,
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Ethernet, and USB are monitored for messages
indicating that the controller and wiring are reliable.
Engine speed. Engine speed is measured at low
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speed and full speed. An overspeed or underspeed
condition will result in a fault condition and shutdown.
Generator output
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Operating the generator at full speed allows the
RDC2 controller to check the output power for correct
voltage, frequency, and stability. When the engine is
running at full speed, the controller verifies that the
voltage and frequency are within acceptable limits. A
fault message is displayed if the voltage or frequency
is out of range.
Oil pressure. Oil pressure is verified to ensure
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proper lubrication of critical engine components.
Section 2 Generator Set Operation
3 min.
1 min.
5 min.
Full-Speed Cooldown
Diagnostics
frequency and voltage.
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