Unloaded Full-Speed Exercise; Loaded Full-Speed Exercise (With Rxt Only); Shutdown During Exercise; Power Failure During Exercise - Kohler 48RCLB Operation

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.
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
TP-7102 3/20
3 min.
1 min.
5 min.
Full-Speed Cooldown
Diagnostics
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.
Pressure is monitored at both low and full speeds. If
the oil pressure is low, low oil pressure is displayed
and the generator set shuts down.
Note: See Section 2.5.4 for information about
Advanced Diagnostic Active in the event history.
2.5.2

Unloaded Full-Speed Exercise

The unloaded full speed exercise runs the generator set
at full speed for 20 minutes without transferring the load.
To set an unloaded full speed exercise, follow the
procedure in Figure 2-3 and select Exercise Mode:
Unloaded Full.
2.5.3 Loaded Full-Speed Exercise (with
RXT only)
A loaded exercise starts the generator set, ramps up to
full speed, and then transfers the electrical load from the
utility source to the generator set. The load is transferred
back to the utility source before the generator set shuts
down.
Note: With a loaded exercise, power to the building is
lost for up to 10 seconds during load transfer.
For a loaded exercise controlled by the RDC2 controller,
a Model RXT transfer switch must be connected to the
generator set. To set a loaded exercise, follow the
procedure in Section 2.5.8 and select Exercise Type:
Loaded.
Section 2 Generator Set Operation
frequency and voltage.
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