dooch N747D - Troubleshooting Check Items

BOOSTER PUMP SYSTEM 55
BOOSTER PUMP SYSTEM N747D
2. Check items
1. No operation is started when powered ON;
⑴ Check power voltage (208V~440V).
⑵ Check power, wire short and contact terminals.
2. When powered ON, only LCD Back Light is turned on;
⑴ Turn VR counterclockwise with PIN driver.
⑵ Check cables connected to LCD.
3. No front Key works;
⑴ Check cables connected to control board Key.
4. After set front panel switches for pump #1, Pump #2 and Pump #3
at AUTO position, no pump is not identified on the LCD screen;
⑴ Check switch contact points.
⑵ Verify the shortages of 5. PENT and 12. CG wire of Pump-OPT
board.
⑶ Check the contact point of 5. PENT and 12. CG wire of Pump-
OPT board.
(Verify LED ON state of Pump-OPT board.)
5. “Start/Stop” switch of the front panel does not work;
⑴ Check switch contact points.
⑵ Verify the shortages of 20.CG and 25. Run wire of main board.
⑶ Verify the contact points of 20.CG of main board and 25. Run
wire. (Verify LED ON state of main board.)
6. The output of inverter is not sufficient;
(EX. While front LCD shows 100%, internal inverter operates in
50Hz.)
⑴ Adjust DAC value in installer’s settings.
7. While the inverter is displayed on front LCD, pump does not work;
⑴ Check wire shortage and contact points of 18.RI0C and
19.RI0A of main board.
⑵ Verify if any short raises in 18. RI0C and 19. RI0A wire. ( RUN
signal work when short)
⑶ Verify the shortages and contact points of 35.VO0 and
36.CGwire.
⑷ Check DC voltage of 35. VO0 and 36. CG wire in main board.
(EX. DC 5V = 30Hz, DC10V = 60Hz)