HGM9510 GENSET PARALLEL UNIT
HGM9510 Genset Parallel Unit ISSUE 2013-08-06 Version 1.1 Page 16 of 65
5.4 AUTO START/STOP OPERATION
Auto mode is selected by pressing the button; a LED besides the button will illuminate to
confirm the operation.
Automatic Start Sequence:
1. When “Remote Start” is active, “Start Delay” timer is initiated;
2. “Start Delay” countdown will be displayed on LCD;
3. When start delay is over, preheat relay energizes (if configured), “preheat delay XX s”
information will be displayed on LCD;
4. After the above delay, the Fuel Relay (if configured) is energized, and then one second later,
the Start Relay is engaged. The engine is cranked for a pre-set time. If the engine fails to fire
during this cranking attempt then the fuel relay and start relay are disengaged for the pre-set
rest period; “crank rest time” begins and wait for the next crank attempt.
5. Should this start sequence continue beyond the set number of attempts, the start sequence
will be terminated, the first line of LCD display will be highlighted with black and Fail to Start
fault will be displayed.
6. In case of successful crank attempt, the “Safety On” timer is activated, allowing Low Oil
Pressure, High Temperature, Under speed and Charge Alternator Failure inputs to stabilise
without triggering the fault. As soon as this delay is over, “start idle” delay is initiated (if
configured).
7. During “start idle” delay, under speed, under frequency, under voltage alarms are inhibited.
When this delay is over, “warming up” delay is initiated (if configured).
8. In the case of a single generator system, after the “warming up” delay, if generator status is
normal, its indicator will be illuminated. If generator voltage and frequency have reached
on-load requirements, then the generator close relay will be energized; genset will take load;
generator power indicator will illuminate and generator will enter into Normal Running status.
If voltage or frequency is abnormal, the controller will initiate shutdown alarm (alarm
information will be displayed on LCD).
9. In case of running in parallel, after the warming up delay:
a) If bus has no voltage, then the controller will send a closing signal to other waiting parallel
gensets and generator close relay will activate, this prevents other sets in the system from
attempting to close their own breakers at the same time.
b) If bus has voltage or other gensets are already closed, the controller will adjust speed and
voltage through GOV and AVR to synchronize the gensets to the bus; when synchronism
requirements has been achieved, breaker close signal will be initiated and the genset will be
paralleled with the bus. Once they are paralleled, the controller will control the generator to
gradually accelerate and share load with other paralleled gensets.
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