Product Manual

TP-6880 2/2122 Section 2 Generator Set Operation
restarted until the emergency stop switch(es) is/are
reset.
Lockout/Tagout
The emergency stop button can be locked in the STOP
position. Insert a lock through two openings in the yellow
shroud to prevent the stop button from being pulled out.
See Figure 2-1. Remove the lock for normal operation.
A lock is not required in order to keep the switch
activated. The switch button will stay depressed until it is
pulled out by the operator.
Resetting the Emergency Stop Switch
To reset the E-stop switch, remove the locking device
and pull the button out. Reset the controller by pressing
the OFF/RESET button.
2
GM103743
1. Two openings in the shroud for customer-provided lockout/
tagout device
2. Stop button
1
1
Figure 2-1 Emergency Stop Switch (optional)
2.3.5 Engine Start Crank Cycle
The controller attempts to start the generator set three
times (three crank cycles, 15 seconds crank and
15 seconds off). If the generator set does not start in
three attempts, the system shuts down on an overcrank
fault. See Section 2.5.
Cranking 1, 2, and 3 are displayed during the crank
cycle. Pressing the OFF button during the crank cycle
stops the cranking. No other buttons are acknowledged
during the crank cycle.
2.3.6 Engine Cooldown
The engine cooldown time delay allows the engine to
run after the loads have been removed.
The engine cooldown time delay is set to 5 minutes. The
engine stops before the cooldown time delay expires if
the temperature drops below the cooled-down
temperature level, or if the temperature rises above the
high limit during the cooldown cycle.
If a transfer switch other than the Model RXT is used, an
additional engine cooldown time delay may be
programmed on the transfer switch. To allow the smart
engine cooldown on the RDC2 controller to operate
most efficiently, set the cooldown time on the transfer
switch controller to zero or the minimum time allowed.
Refer to the instructions provided with the transfer
switch for more information.
2.3.7 Automatic Operation with Model
RXT Transfer Switch
The Model RXT transfer switch connects to the RDC2
controller through the ATS interface board on the
transfer switch. Also see the Model RXT Transfer Switch
Operation/Installation Manual for more information
about transfer switch operation.
The controller must be in AUTO mode for automatic
transfer switch operation.
Automatic Start
The RDC2 controller receives utility source voltage
sensing data from the Model RXT transfer switch.
1. If the utility source voltage falls below an
acceptable level, the controller starts 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 generator set runs through the engine
cooldown cycle and then stops.