56 BOOSTER PUMP SYSTEM
BOOSTER PUMP SYSTEM N747D
8. MC does not work in each pump;.
⑴ Check if each MC power is 220 V.
⑵ Verify shortages and contact points of 1. IPA, 2. IPC, 3. DPA
and 4. DPC wire in Pump-OPT.
9. There is big gap between analog pressure gauge and the current
pressure of LCD screen;
⑴ Check the maximum pressure sensor value in use.
⑵ Adjust the maximum pressure sensor value in the installer’s
setting screen.
10. Analog pressure gauge is very close to the current pressure of
LCD screen;
⑴ Adjust sensor correction value in the installer’s setting screen.
11. Main pump and auxiliary pump operate continuously;
⑴ Check the rotation direction of the pump ( it’s possible in test
operating).
⑵ Re-set the operating pressure and time of the auxiliary pump.
12. Auxiliary pump operates frequently;
⑴ In the user setting screen, re-set the operating pressure and
time of auxiliary, sequential stop pressure and time.
13. Only main pump operates.
⑴ In the user setting screen, re-set the shift time of main pump.
⑵ Shift the pump by operator with the front switch.
14. Frequent starting phenomenon happens in emergent operation
due to the inverter trouble;
⑴ In the user setting screen, re-set the sequential operation
pressure and time, sequential stop pressure and time.
15. It is changed to “sequential operation 2” by user;
⑴ Adjust the deviation of pressure switch.
16. Various alarms raise (Buzzer, Lamp operates);
⑴ Enter front numeric Key and initial screen Key once. (Buzzer
OFF, Lamp OFF)
⑵ Check the caused troubles and take corrections.
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