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TP-6804 1/15 23Section 2 Generator Set Operation
Press the AUTO button to put the controller into
automatic mode.
Automatic Start
The engine start contacts on the ATS close to signal the
generator set to start, and remain closed while the
generator set is running.
Automatic Stop
The engine start contacts on the ATS open to signal the
generator set to stop.
2.4 Exercise
The RDC2 or DC2 controller can be set to automatically
run the generator set at the same time and day each
week. Exercising the generator set weekly or every two
weeks is required to keep the engine and alternator in
good operating condition.
Three exercise modes are available: unloaded cycle,
unloaded full speed, and loaded full speed. See
Sections 2.4.2 through 2.4.4 for information about the
exercise modes. A loaded exercise can be set at the
RDC2 controller only if a Model RXT transfer switch is
connected.
Note: With transfer switches other than the Model RXT,
it is possible to have two exercise settings (one
unloaded exercise set at the generator set
controller, and another exercise set at the ATS
controller). If the exercise times overlap, the ATS
exercise setting takes priority.
If a transfer switch other than the Model RXT is used,
refer to the instructionsprovided with the transfer switch
to set a loaded exercise at the ATS, if desired.
2.4.1 Setting the Exerciser
When power is applied to the RDC2 controller (that is,
when the battery is connected), you will be prompted to
set the date and time, and then to set the exerciser.
The firstsetting will flash. Press the Upand Down arrow
buttons to change the setting. Press Select to save the
setting and move on to the next. See Section 3.5 for
more detailed instructions to change settings on the
RDC2. See Section 3.6 for more detailed instructions to
set the exerciser or change the exercise settings.
The DC2 controller does not prompt you to set the
exerciser. See Section 4.5 for instructions to set the
exerciser on the DC2.
2.4.2 Unloaded Cycle Exercise with
Complete System Diagnostics
An unloaded 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 default
exercise setting.
The Unloaded Cycle exercise runs the engine for 20
minutes in the cycle shown in Figure 2-1 and described
below.
D Runs at reduced speed for 10 minutes to warm up
and exercise the engine.
D Ramps up and runs at full speed for 3 minutes.
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 problemswith thepower outputand alertthe
operator before an emergency event.
D Ramps down and runs at reduced speed for 5
minutes to cool down the engine before s hutting
down automatically.
Engine Speed, RPM
Engine
Exercise
Full-Speed
Diagnostics
Cooldown
3min.
1min.
1min.
10 min. 5 min.
Figure 2-1 Unloaded Exercise Cycle
System Diagnostics
During the unloaded exercise, the controller monitors
the following data. The c ontroller display indicates that
the generatorset isrunning, unless afault isdetected as
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