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TP-6461 1/08 61 Section 4 Controller Test and Replacement
4.5 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 contactor
is in the standby position, it transfers immediately to the
preferred position.
4.5.1 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
contactor does not change position during an unloaded
test, but if the normal source should fail, the contactor
will transfer to the emergency source. The unloaded test
feature will be available only with the Util-Genset and
Genset-Genset modes of operation.
4.5.2 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 signaled to start
immediately upon test activation. Load control signals
are issued prior to transfer with their associated time
delays. Since the loaded test transfer will be between
two live sources, the in-phase monitor will be activated if
it is enabled. If the preferred source is lost during a
loaded test with the contactor 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 and an in-phase transfer will occur if
enabled. The loaded test feature will be available with
the Util-Genset, Util-Util and Genset-Genset modes of
operation.
4.5.3 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.
4.5.4 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 4-8 and Figure 4-9 for flowcharts
showing the test sequence of operation without and with
load.