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TP-6804 1/1524 Section 2 Generator Set Operation
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
RDC2/DC2 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.
D Oil pressure. Oil pressure is verified to ensure
proper lubrication of critical engine components.
Pressure is monitored at both reduced and full
speeds. If the oil pressure is low, the Low Oil
Pressure messageis displayed andthe generatorset
shuts down.
2.4.3 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 3-8 and select Exercise Mode:
Unloaded Full.
2.4.4 Loaded Full-Speed Exercise (with
RXT only)
A loaded exercise starts the generator set, ramps up to
full speed,and then transfers theelectrical load fromthe
utility source to the generator set. After 20 minutes, the
load is transferred back to the utility source. The engine
runs without load for 5 minutes or until cool, and then
shuts down automatically.
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 or DC2
controller, a Model RXT transfer switch must be
connected to the generator set. To set a loaded
exercise, follow the procedure in Figure 3-8 and select
Exercise Type: Loaded.
For a loaded exercise with a transfer switch other than a
Kohlerr Model RXT, program the exercise at the
transfer s witch controller. Refer to the transfer switch
operation manual for instructions.
2.4.5 Power Failure During Exercise
Cycle
If the utility power is lost during an unloaded exercise,
the ATS transfers to the emergency source, the
exercise is ended and the control remains in the AUTO
mode.
If the utility power is lost during a loaded exercise, the
exercise is ended. The ATS remains in the emergency
position and the control goes into the AUTO mode.
The generator set continues to run and supply power to
the load for the duration of the utility power outage.
When Utility power is restored, the ATS will re-transfer
to the utility source through normal timing sequences.