ACC4100 Diesel Air Compressor Controller User Manual Page 10 of 52
4.2 CONTROLLER PANEL
Fig. 1 Front Panel Description
NOTE: Description for parts of the indicators:
Alarm Indicator: slow flash (once per second) for warning alarm; quick flash (5 times per second) for stop alarm; light off
for none alarms;
Status Indicator: it illuminates always as air compressor is normally running.
4.3 START/STOP OPERATION
4.3.1 START SEQUENCE
a) Press and start air compressor;
b) If pre-heat time is configured, then pre-heat relay outputs (if configured); LCD displays “pre-heat
delay xx”;
c) After pre-heat delay is over, fuel relay outputs the pre-set fuel time before start (default: 1s), then
starting relay outputs; If air compressor crank disconnect fails during “crank time”, then fuel relay
and starting relay stop outputting, and enter “crank rest time”, waiting for next start;
d) After the pre-set start attempts, if air compressor doesn't succeed to start, then controller issues
failed to start alarm, and meanwhile LCD alarm page displays “Failed to Start” alarm;
e) During any one of the start attempts, if crank disconnect is fulfilled, then it enters "Safety On Delay",
during which oil pressure low, water temperature high, under speed, and charging failure alarms are
all inactive; after safety on delay it enters “Start Idle Delay” (if configured);
f) During start idle delay, under speed alarm is inactive; after “Start Idle Time” it enters idle running; if
load key is pressed, then load control outputs and it enters “Warming Up Time” (if configured);
g) When warming up time is ended, air compressor enters normal running status; if speed is abnormal,
controller shall issue alarms and stops it (LCD alarm page displays alarm information).
4.3.2 STOP SEQUENCE
a) Press , and stop the running air compressor; before stop if load control outputs, then
disconnect load control;
b) If “Cooling Time” is configured, then “cooling delay” starts; when cooling delay is over, it enters
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