Kohler KEP User Manual

TP-6745 7/1056 Section 3 Controller Test and Replacement
3.6 System Test
Use the system test feature to:
D Start and run the generator set, or
D Simulate a preferred source failure, resulting in a
transfer to the standby source.
A password is required to activate the system test,
ensuring that only authorized personnel can start a test.
Pressing the Test pushbutton signals the controller to
initiate the system test sequence.
An Auto-Loaded test executes for a set length of time
and then ends automatically. Press the End Test
pushbutton to end a Loaded or Unloaded test. Time
delays will execute as programmed after the end test
button is pressed. Pressing the End Delay button will
end the currently displayed time delay.
To check the source voltage and frequency while a test
is running, press the Main button. Press the Test button
to return to the test sequence screens.
During a system test, if the emergency source becomes
unavailable based on its preset operating parameters,
the fail to acquire standby signal is indicated
immediately, and the test is terminated. If the power
switching device is in the standby position, it transfers
immediately to the preferred position.
3.6.1 Unloaded System Test
When an unloaded test is initiated, the controller
immediately signals the generator to start, without
waiting for time delay engine start to timeout. The power
switching device does not change position during an
unloaded test, but if the normal source should fail, the
power switching device will transfer to the emergency
source. The unloaded test feature will be available only
with the Util-Genset and Genset-Genset modes of
operation.
3.6.2 Loaded System Test
A loaded test actually simulates a preferred source
failure, except that the engine start time delay is
bypassed. The generator set is s ignaled to start
immediately upon test activation. Load control signals
are issued prior to transfer with their associated time
delays. If the preferred source is lost during a loaded
test with the power switching device in the standby
position, the test will continue to be active, even on
restoration of preferred. If the standby source is lost and
the preferred source is available, the test will be
terminated, and the transfer switch will immediately
transfer to the preferred source position, bypassing all
time delays except the off-position requirements in a
programmed-transition system.
When a loaded test is terminated normally, the
retransfer sequence will be as though the preferred
source has been restored after a failure. All time delays
will be executed. The loaded test feature will be
available with the Util-Genset, Util-Util and
Genset-Genset modes of operation.
3.6.3 Auto-Loaded System Test
The auto-loaded test feature is a timed loaded test. The
auto-loaded time delay determines how long after the
transfer to standby to terminate the test and transfer
back to the preferred source. The time is defaulted to
30 minutes and can be adjusted from 1 minute to
60 minutes.
3.6.4 Test Procedure
Use the following procedure to run a test to check the
transfer switch operation. Watch the LEDs on the
controller’s user interface as the time delays run and
Source E becomes available when the generator set
starts. For a loaded test, watch the position LEDs to
verify that the ATS transfers the load.
The test sequence simulates a loss of the normal
source, starts the generator set, and transfers the load
to the emergency source (loaded test), executing all
time delays that are set up to operate during a loss of the
normal source. When the test is ended in step 8 of the
procedure, the transfer switch transfers the load back to
the normal source and removes the engine start signal,
executing all programmed time delays.
Refer to Figure 3-13 and Figure 3-14 for flowcharts
showing the test sequence of operation without and with
load.
Note: If the standby source fails during a test, the ATS
will immediately attempt to transfer to the
preferred source.
Check the preferred source selection. The test
procedure assumes that Source N is the preferred
source. (Alarm board accessory is required in order to
access the preferred source selection menu.)
If the transfer switch is equipped with a supervised
transfer switch, verify that it is set to the Auto position.

Kohler KEP Specifications

General

Brand	Kohler
Model	KEP
Category	Switch
Language	English