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TP-6880 2/21 25Section 2 Generator Set Operation
2.4.5 Shutdown During Exercise
(Advanced Diagnostic)
The following advanced diagnostic operation applies to
RDC2 controllers with firmware versions 5.04 and
higher.
If the generator set shuts down on a fault during an
exercise, the controller will try to restart the engine. If the
engine starts, the generator set will run at full speed for
two minutes and then stop. The event history will show
Advanced Diagnostic Active. The exercise schedule is
maintained.
If the engine does not start, the shutdown message will
be displayed. Correct the fault condition and reset the
fault as described in Section 2.5.
2.4.6 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.
2.5 Faults
The RDC2 controller displays fault messages for
generator set warnings and shutdowns. Selected fault
messages are shown in Figure 2-4.
2.5.1 Warnings
The controller displays a fault message but the
generator set does not shut down on a warning. The
controller resets automatically after a warning condition
is corrected.
2.5.2 Shutdowns
Under a fault shutdown condition, the generator set
shuts down automatically and the controller displays a
fault message. The OFF LED flashes. In some cases,
the engine cooldown cycle runs before the engine shuts
down. See Figure 2-4.
Shutdown switches (such as the low oil pressure switch
or high engine temperature switch) on the generator set
will automatically reset when the problem is corrected.
However, the fault condition at the controller does not
clear until the controller is reset.
The generator set cannot be restarted until the fault
condition is corrected and the controller is reset. See
Section 2.5.4 for instructions to reset the controller after
a fault shutdown.
2.5.3 ATS Communication Errors
When a Model RXT transfer switch is used, an ATS fault
indicates that the connection to the interface board on
the transfer switch has been lost. Check the connection
to the ATS interface board.
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