Product Manual

TP-6804 2/2128 Section 2 Generator Set Operation
2.5.4 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. 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 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
Kohler Model RXT, program the exercise at the
transfer switch controller. Refer to the transfer switch
operation manual for instructions.
2.5.5 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, placing itself back into AUTO
and ready to support an emergency power outage. 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 2.6.
2.5.6 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.