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TP-6880 10/14 23Section 2 Generator Set Operation
System Diagnostics
During the unloaded exercise, the controller monitors
the following data. The controller display indicates that
the generatorset isrunning, unlessa fault is detectedas
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
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 oilpressure islow,the LowOil Pressure
message is displayed and the generator set shuts
down.
2.4.3 Unloaded Full-Speed Exercise
Theunloaded full-speedexercise runsthegenerator set
at fullspeed for 20 minuteswithout transferring the load.
To set a n 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 switch 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,
theATStransferstothe emergencysource,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.
WhenUtility poweris restored,theATSwillre-transfer to
the utility source through normal timing sequences.