Test
activated
Engine start
sequence
Test timer
starts
Engine stop
sequence
Controller to
mode after test
Test
timer
expired
No
Yes
Stop
sequence
OK
No
Yes
Start
sequence
OK
No
Yes
Alarm
Alarm
1. The controller starts the emergency genset when the TEST function is activated.
2. The test timer starts when the emergency genset has started.
3. The emergency genset runs at its nominal frequency (without synchronising or
closing the genset breaker) until the test timer runs out.
4. After the test timer runs out, the emergency genset cools down and then stops.
5. The EMERGENCY genset controller changes to the mode specified in the After
EDG test parameter.
9.6.3 Parallel test
For the parallel test, the controller starts the emergency genset, and closes the genset breaker. The controller runs the genset at the
specified test base load for the specified time, then opens the genset breaker and stops the emergency genset. The tie breaker is
closed for this test.
DESIGNER'S HANDBOOK 4189340911K UK Page 334 of 521
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