HMC6 Power Management Controller User Manual Page 14 of 87
b) When Start Output Delay is over, Start Wait Delay will be initiated. Fail to Start alarm will be initiated if the
on-load requirement has Not been achieved after the Start Wait Delay has expired. The alarm type of Fail to
Start is block which means users can restart the generator only when the alarm is acknowledged;
c) When Start Wait Delay is over, Load Stability Delay will be initiated. F/V Fault alarm will be initiated if the
on-load requirement has Not been achieved after the Load Stability Delay has expired. The alarm type of
F/V Fault is block which means users can restart the generator only when the alarm is acknowledged.
However, it enters into “Normal Running” status if the onload requirement has been achieved;
d) If the switch is not closed during the normal running status and the voltage/frequency has not satisfied the
on-load requirement suddenly, Transient Fault Delay will be initiated. F/V Fault alarm will be initiated if the
on-load requirement has Not been achieved after the Transient Fault Delay has expired. The alarm type of
F/V Fault is block which means users can restart the generator only when the alarm is acknowledged;
e) If the on-load requirement has been achieved (Generator normal light will illuminate), the genset will close
and synchronize automatically after pressing the button;
f) In case of multi-set operation, the genset will share load automatically;
g) If there is trip or shutdown alarm occurs, then the system will open switch or stop and the alarm
information will be displayed on the LCD;
Semi-auto Stop：
a) In breaker close status, press open button , in case of multi-set operation, first of all, the system will
transfer load and open breaker; in case of single unit running, it will open breaker directly;
b) After breaker opened or in breaker open status, press stop button , system will enter into “Stop
Output Delay” while the stop relay will activate;
c) After “Stop Output Delay”, system will enter into “Wait for Stop” delay. If genset voltage and frequency
signals disappeared during the delay, controller will judge that the genset stopped and in standby state;
otherwise, if genset voltage and frequency signals still can be detected after the delay expired, controller
will judge that the genset failed to stop;
d) After genset failed to stop, if voltage and frequency signals are disappeared, controller will judge that the
genset stopped completely and entered into standby state.
6.1.3 AUTO MODE
Auto mode is activated by pressing key;
All available diesel generator units are controlled by the power management system and are started and
stopped according to the start priority and the actual busbar load. Should a running generator develop an
alarm, the system will start the next generator in line and synchronize its breaker before taking the failing
generator out of service. At the same time, the system monitors that the generators are not overloaded. Should
that be the case, the Non Essential Load (NEL) trip will activate to maintain power supply to the main busbar.
If a heavy consumer is requested, the system calculates the power needed and starts an additional
generator if needed before allowing the heavy consumer to be connected.
Auto Start Rules
a) If the system detects that there is no voltage signal on busbar, then the available diesel generator units
are started according to the start priority;
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