HOMA H Series - Manual (Page 7)

H Series
P U M P
Installation, Operation, and Maintenance Manual
Initial Installation Troubleshooting:
Only authorized Homa Pump Technology
service personnel who are trained professionals
shall troubleshoot and repair pumps that are
experiencing performance difficulty.
The following is a tabulation of common
pump problems and possible causes.
Symptom
Possible Causes
Pump will not start
`
1,2,3,4
Little or zero discharge
5,6,7,8,
Insufficient discharge flow/pressure
5,6,9,10,11,12
Excessive power consumption
6,9,13
Excessive current draw
6,13,14,15
Excessive pump vibration/noise
12,15,16
Pumps runs & motor protection trips
17,18,19,20,21
Pumps runs manually, but not automatically
22,23,24
LISTING OF CAUSES:
1. Incorrect or no power supplied to motor.
2. Power cable cut.
3. Short to ground in cable or motor winding.
4. Control Panel circuit breaker open.
5. Actual System head is higher than calculated
or specified.
6. Incorrect impeller rotation direction.
7. Sump liquid level is below pump's minimum
submergence requirement.
8. Closed discharge valve.
9. Wear ring (s) worn. (If Applicable).
10. Vortex at Pump's suction.
11. Discharge valve partially closed.
12. Insufficient NPSHA (Dry Pit Application).
13. Actual System Head is lower than specified
resulting in over pumping condition.
14. Voltage supply to motor is lower than
required by motor.
15. Worn bearings
16. High system head causing pump to operate
at extremely reduced capacity.
17. Object stuck inside impeller.
18. Motor not receiving voltage on all three
phases.
19. Phase currents unbalanced or too high.
20. Insulation between phases and earth
ground,<1M-ohm.
21. Density of the pumping media too high.
22. Defective level sensor.
23. Hand/Off/Auto switch not in Auto Position.
24. Defective H/O/A switch , relay or contactor
coil.