TP-6734 5/10 21Section 2 Operation
2.6 Generator Set Operation
2.6.1 Engine Start Crank Cycle
The controller attempts to start the generator set three
times (three crank cycles, 15 seconds crank and
15 seconds off). See Figure 2-3 for display information
during the crank cycle. If the generator set does not start
in three attempts, the system shuts down on an
overcrank fault. See Section 2.9.
Pressing the OFF button during the crank cycle stops
the cranking. No other buttons are acknowledged
during the crank cycle.
2.6.2 Local Starting and Stopping
Start
Press the RUN button to immediately start the generator
set. The engine start time delay will be ignored.
The controller attempts to start the generator set three
times. If the generator set does not start in three
attempts, the system shuts down on an overcrank fault.
See Section 2.9.
Stop
1. Run the generator set with no load for at least
2 minutes to ensure adequate engine cooldown.
2. Press the OFF button. The engine stops.
2.6.3 Automatic Operation with Model
RRT Transf er Switch
The model RRT transfer switch connects to the RDC/DC
controller through the ATS interface board on the
transfer switch. Also see Section 2.10, Model RRT
Transfer Switch Operation.
The controller must be in AUTO mode. Press the AUTO
button to put the controller into automatic mode.
Automatic Start
The RDC/DC controller receives utility source voltage
sensing data from the model RRT transfer switch.
1. If the utility source voltage falls below an
acceptable level, the controller s tarts the engine
start time delay.
2. If the utility source is not restored before the time
delay expires, the generator set starts.
3. After the Normal-to-Emergency time delay, the
ATS is signaled to transfer the load to the
emergency source.
Automatic Stop with Engine Cooldown
1. When the utility source is restored, the
Emergency-to-Normal time delay starts.
2. When the Emergency-to-Normal time delay
expires, the load is transferred to the utility.
3. The controller runs the generator set for the
cooldown time and then stops the generator set.
2.6.4 Automatic Operation with Model
RDT or RSB Transfer Switches
If a Kohler Model RDT or RSB transfer switch is used,
the engine start contacts from the ATS must be
connected to engine start leads 3 and 4 on the generator
set.
The controller must be in AUTO mode to respond to
remote start/stop signals from an ATS or remote switch.
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
Open the contact across engine start leads 3 and 4 to
signal the generator set to stop.
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