Test; Unloaded Test; Loaded Test (With Rrt Only); Power Failure During Test Cycle - Kohler 14RES Manual

4.7 Test

An operator can use the buttons on the RDC/DC
controller to test the generator set operation. Follow the
instructions below to run an unloaded or loaded test.
4.7.1

Unloaded Test

An unloaded test runs the generator set at full speed
without signaling the transfer switch to transfer the
electrical load from the utility source to the generator
set.
Unloaded Test Procedure
1. Press the RUN button to start an unloaded test.
The engine cranks and starts.
Note: Pressing the OFF button during the crank
cycle stops the cranking. No other buttons
are acknowledged during the crank cycle.
2. When the generator is running, tnLd appears on
the display and the RUN LED is illuminated. The
engine runs at
(3600 RPM) during the test sequence.
3. There are two ways to end an unloaded test:
a. Press the AUTO button to shut down the
generator set and enter AUTO mode. OR
b. Press the OFF button to shut down the
generator set immediately. The cooldown time
delay is ignored.
Figure 4-5 describes the effect of pressing the buttons
during a test when there are no active faults.
4.7.2

Loaded Test (with RRT only)

A loaded test starts the generator set and then signals
the Model RRT transfer switch to transfer the electrical
load from the utility source to the generator set. The
load is transferred back to the utility source before the
generator set shuts down.
Note: If a Model RDT or RSB transfer switch is used, a
loaded test cannot be initiated from the RDC or
DC controller. To run a loaded test, refer to the
instructions provided with the transfer switch.
44 Section 4 Controller
normal operating speed
Loaded Test Procedure
1. Press the RUN button to start an unloaded test as
described in Section 4.7.1. When the generator is
running at full speed, tnLd appears on the display.
2. Press the down arrow button (RDC) or the exercise
button (DC) to signal the ATS to transfer the load.
The display indicates a loaded test, t Ld.
3. To end the test, press the AUTO button to shut
down the generator set through normal timing
sequences. The generator set goes into Auto
mode. The load is transferred to utility power, if
available. The engine cooldown cycle runs before
the generator set engine stops.
Immediate Shutdown During a Loaded Test
Press the OFF button to shut the generator set down
immediately, if necessary. The cooldown time delay is
ignored, and the controller goes to OFF mode. The
controller signals the RRT transfer switch to transfer the
load back to utility power.
Note: Running the generator set with no load for at least
2 minutes is recommended to ensure adequate
engine cooldown. Use the OFF button to stop a
loaded test only if necessary.
4.7.3

Power Failure During Test Cycle

If the utility power is lost during an unloaded test, the
controller goes into the AUTO mode and the ATS
transfers to the emergency source.
If the utility power is lost during a loaded test, the
controller goes into the AUTO mode. The ATS remains
in the emergency position.
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 re-transfers to
the utility source through normal timing sequences.
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