GU641A Controller Operation Manual
12
CAUTION:
If magnetic pickup is not used, to avoid damage to the start motor please make
sure the generator
’
s voltage is higher than the measurable value of controller while
cranking, since the crank cutout signal is sensed from the generator voltage and
frequency.
NOTE:
Above control procedure, assumes that one of configurable inputs has been
configured as
Gen Aux. Switch Closed
and connects the switch
’
s N.O. Aux.
contact signal to this port. If you do not configure an input as
Gen Aux. Switch
Closed
, then the GCB closed LED illuminates is only an indication that the
GCB close/open relay should have been closed.
If you have selected idle function, the idle relay will be closed at the same time as the crank relay is
closed, the idle timer will begin counting down after successful crank, when it times out, the idle relay
opens, other procedure is the same as above.
NOTE:
Controller will not detect under voltage, under frequency, under speed, and charge
failure during idle period.
Repeat Crank:
During the crank period, if the engine can not ignite controller will not output start signal
during crank rest. Once crank rest timer times out the start relay energises once again and will attempt to
start engine again. The above procedure will be repeated until engine successfully ignites or reaches
the preset number of crank attempt.
If any shutdown alarm occurs during crank, controller will stop cranking immediately, and the Genset only can be
restarted after clearing the failure and reset.
Start Failure:
When the procedure above repeats again and again and reaches the preset number of
crank attempt, the crank relay output is then de-engised. The failure LED illuminates and the LCD
displays
Fail to Start
.
CAUTION:
If Fail to Start occurs, operator must check the whole Genset system to find out
failure reason, only after clearing the failure can press
“
STOP / RESET
”
button
to relieve fault lock out status, and restart the Genset
.
Mains return and generator shutdown sequence:
When Mains resumes to normal, Mains Normal LED illuminates, the
Mains ON delay
timer is activated,
GCB close/open relay is de-energised after it times out, MCB Close/open relay is energised, transfer
switch switches on Mains, the Mains Aux. Switch
’
s contact feeds back the signal to a configurable input
on our controller, MCB closed LED illuminates.
At the same time as the MCB close/open relay is energised, the timer for cool down is activated, when it
times out, the fuel relay de-energises, generator stops and recovers to its standby status.
NOTE:
If you do not configure an input as
Mains Aux. Switch Closed
, then the MCB
closed LED illuminates but is only an indication that the MCB close/open relay
should have been closed.
