Import/Export doesn't go below 0 ± 5% the alarm WrnTstOnLdFail becomes active and it's
recorded in the history. If the setpoint Im/EF input = EarthFltC then the MCB is opened after
delay given by setpoint BreakerOverlap.
Or
will make a switchover (setpoint Synchro Enable = NONE or REVERSE), i.e. open the MCB,
wait for Transfer Del and close the GCB.
After the binary input Rem TEST OnLd has been deactivated, the controller goes back to the previous
operation mode (synchronize or switchover with regard to the setpoint Synchro Enable). In most cases
it will be AUT mode and the controller will either stay supplying the load if the mains have failed, or will
transfer the load back to the mains.
NOTE:
During the BreakerOverlap time, when both breakers are closed, the load is controlled either to zero
Import/Export level (if the MCB has to be opened) or to zero level (if the GCB has to be opened).
Periodic exercises
The output from the Exercise timer 1 is internally connected to the Remote TEST binary input to
enable periodic testing of the gen-set.
The controller must have AUT mode selected by the mode buttons and the other “mode forcing” binary
inputs must not be active to ensure proper function of the exercise.
NOTE:
If a shutdown or other red alarm occurs while the load is supplied from the gen-set and the mains are
healthy, the load is switched back to the mains.
6.4 Engine start
6.4.1 Diesel engine
The setpoint Fuel Solenoid must be switched to the DIESEL position.
1. After the command for start is issued (pressing START button in MAN mode, auto start
condition is fulfilled in AUT mode or controller is switched to TEST mode), the output Prestart
is energized for time period given by the setpoint Prestart Time.
2. After the prestart has elapsed, the output Fuel Solenoid is energized and 0.5 after that the
starter motor is activated by energizing the output Starter.
3. When one or more of following conditions are met, the prestart and starter of both outputs are
de-energized:
The engine speed exceeds the value of Starting RPM, or
One of additional running indication signals becomes active.
4. The controller remains in the Starting phase until the engine speed exceeds the value of
Starting RPM, after that it is considered as started and the Idle period will follow.
5. The maximum duration that the starter motor is energized is determined by the setpoint
MaxCrank time. If the engine does not start within this period, the starter motor is de-
energized and a pause with length determined by CrnkFail pause will follow. Prestart output
remains active during the pause. After the pause has elapsed, the next start attempt is
executed. The number of start attempts is given by the setpoint Crank Attempts.
6. Once the engine is started, the Idle period follows. The binary output Idle/Nominal remains
inactive (as it was during the start). The idle period duration is adjusted by the setpoint Idle
Time.
7. After the idle period has finished, the output Idle/Nominal is activated and the start-up
sequence is finished. The stabilization phase follows.
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