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7.
SG SYSTEM MODE DESCRIPTION
7.1 SG SYSTEM MODE
7.1.1 MANUAL MODE
When Manual mode signal is active, the system will work through manual mode. In this mode, HMC6
controller can only monitor data and alarm information but cannot control switch or engine. In addition, GOV
and AVR do not work but the manual governor IN, manual governor OUT, manual VOLT IN and manual VOLT
OUT do work in this mode.
7.1.2 SEMI-AUTO MODE
Semi-auto mode is activated by pressing
the unit will not initiate any sequences automatically, as is the case with the auto mode. It will only initiate
sequences, if external signals are given.
An external signal may be given in three ways:
1. Push-buttons on the display are used
2. Digital inputs are used
3. Modbus commands are used
In semi-auto mode, all available diesel generator units can be started/stopped/synchronizing
closed/unloaded open upon push-button commands on the front panels for each generator.
The system monitors that if the generators are 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. If the available power is
insufficient, the heavy consumer connection will not be allowed.
Semi-auto Start：
Press the start button
a)
valve closing (if configured). If the state is not detected, the shaft solenoid valve closing outputs (if
configured) and will be waited for the feedback state to be effective;
After the feedback signal of shaft solenoid valve closing is detected, HMC6 initiates a start command
b)
and the system enters the "start output" delay, during which the engine starts relay output;
When Start Output Delay is over, Start Wait Delay will be initiated. Fail to Start alarm will be initiated if
c)
the onload 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;
When Start Wait Delay is over, Load Stability Delay will be initiated. F/V Fault alarm will be initiated if
d)
the onload 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;
If the switch is not closed during the normal running status and the voltage/frequency has not
e)
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
HMC6 Power Management Controller User Manual
key (or by semi-auto mode switch); Semi-auto means that
, the controller firstly judges the feedback state of the shaft solenoid
Page 18 of 87
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