GU641A Controller Operation Manual
15
Stop control sequence for N.O. type:
During the controller
’
s stop sequence, the fuel relay energises, fuel solenoid is on power, the fuel solenoid
closes the fuel valve and the engine begins to stop. After a delay (same as Stop delay) fuel relay de-
energises, disconnecting the supply from the fuel solenoid.
Other control sequences are same as engine whose fuel solenoid is N. C. type.
4.6 Idle function:
For
idle
function configure one of the configurable outputs as
idle
.
Refer to the flow chart
4.9
for start and stop for
idle
control flows.
NOTE:
Controller will not detect under voltage, under frequency, under speed, and charge
failure during idle period.
4.7 Preheat function:
For
Preheat
function, configure one of the configurable outputs as
Preheat
, The controller has 4
selectable preheat control modes as below:
Mode 1
—
during preheat time, preheat relay output energises.
Mode 2
—
during preheat time, preheat relay output energises until the successful ignition.
Mode 3
—
during preheat time, preheat relay output energises until safety-on delay times out.
Mode 4
—
one of the configurable inputs is defined as
Preheat
, preheat relay output energises when this
configurable input is active, and de-energises when configurable input is inactive.
For preheat mode 1 to 3,
please refer to the flow chart
4. 9
for start and stop for
Preheat
control flows.
For preheat mode 4, preheat function is active immediately when the controller is switched on power.
During crank period, the
Preheat
relay output will not energise in any of above modes.
LCD displays icon of preheat operating status when preheat relay output energises:
