Service manual

3. Electrical Parts
3-27
List of functions
Pin No.
Line
color
Connection Function
CN7-1 G/L
Emergency indicator CN16-9
terminal
Power supply (DC24V) for output of engine
revolution pulse outputted between emergency
indicator CN16-1 and CN16-8 terminals.
CN7-2 Y/G
Air filter differential pressure
indicator
Detection of air filter differential pressure indicator
clogging.
CN7-3 Y/L
Emergency indicator CN16-1
terminal
Input of engine revolution pulse.
●Revolution ratio (pulse type):
1 revolution per 6 pulses
CN7-4 W/L Starter motor
Input of starter motor engaging indication signal
(starting).
CN7-5 G/Y
Emergency indicator CN16-12
terminal
Output of air filter clogging warning signal.
CN7-6 L
Emergency indicator CN15-1
terminal
Outputting engine revolution pulse converted for
tachometer by PLC unit.
●Revolution ratio (pulse type):
2 revolutions per 1 pulse
CN7-7 L/W
Emergency indicator CN16-11
terminal
Output of starting difficulty signal.
During automatic starting operation, the interior
contact of PLC unit Y3 terminal becomes ON and
after start signal is outputted to starter relay,
within 10 seconds no voltage is applied to X1
terminal, and auto start cranking is finished
unsuccessfully, the interior contact of Y2 and Y3
terminals should be OFF once, and try again auto
start operation timely.
In case that engine will not start even after three
times trials, the interior contact of PLC unit Y5
terminal should be switched ON and starting
difficulty signal should be outputted.
CN7-8 - NIL
Emergency indicator CN16-8
terminal
CN7-9 B/Y
A
ir filter differential pressure
indicator
Grounding
T7 - Generator unit T7 terminal
T9 - Generator unit T9 terminal
Detection of generation of generator unit (L1-L3).
When engine is automatically started, it is not
electrically conducted to X7 relay and also no
voltage is applied to X7 terminal, the interior
contact of PLC unit Y2 and Y3 terminals should be
switched OFF to stop engine and at the same time
its auto re-start function should be cancelled.