HPM6 Power Management Controller User Manual
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8.
SG SYSTEM MODE DESCRIPTION
8.1
SG SYSTEM MODE
8.1.1
MANUAL MODE
When manual mode signal is active, the system will work through manual mode. In this mode,
HPM6 controller can only monitor data and alarm information but cannot control switch or genset. In
addition, GOV and AVR do not work but the manual GOV IN, manual GOV OUT, manual AVR IN and
manual AVR OUT do work in this mode.
8.1.2
SEMI-AUTO MODE
Semi-auto mode is activated by pressing
key; Semi-auto means that the unit will not initiate
any sequences automatically. It will only initiate sequences if external signal is given and alarm
protection function is always active.
The external signal may be given in three ways:
1. Using display panel keys
2. Using digital inputs
3. Using Modbus command
In semi-auto mode, all available gensets start/stop/synchronizing closed/unloaded open can be
controlled by front panel keys.
The system detects whether gensets are overloaded. Should that be the case, the Non Essential
Load (NEL) trip will activate to maintain power supply to bus.
If a heavy consumer is requested, the system will calculate the power needed. If the available
power is insufficient, the heavy consumer connection will not be allowed.
Semi-auto Start:
a)
Press
key, the controller firstly judges the feedback state of the shaft solenoid valve closing (if
configured). If the state is not detected, the shaft solenoid valve closing outputs (if configured) and
will wait for the feedback state to be effective;
b)
After the feedback signal of shaft solenoid valve closing is detected, HPM6 initiates a start
command and the system enters the “Start Output Delay”, during which the engine start relay
outputs;
c)
When “Start Output Delay” is over, “Wait for Start Delay” will be initiated. “Fail to Start” block alarm
will be initiated if the measured generator voltage and frequency do not reach the set value after the
delay has expired;
d)
When this delay is over, “Load Stable Delay” will be initiated. “Frequency/Voltage Fault” block alarm
and shutdown will be initiated if generator voltage and frequency do not reach the set value after
the “Load Stable Delay” has expired. It will enter into “Normal Running” status if the on-load
requirement has been achieved;
e)
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.
“Frequency/Voltage Fault” block alarm and shutdown will be initiated if the on-load requirement has
