HOMA GRP Series - Manual (Page 6)

GRP Series
Installation, Operation & Maintenance Manual
Installation / Startup Troubleshooting:
Only authorized service personnel who are trained
professionals shall troubleshoot and repair pumps
that are experiencing operational or performance
difficulties.
All HOMA pumps are factory tested, yet startup
difficulties can occur with any mechanical
equipment. Please note that our technical
support staff stands ready to assist you with
any problem or difficulty you might encounter
with our equipment.
The following is a tabulation of common start-
up problems and possible causes.
Symptom
Possible Causes
Pump will not start
1, 2, 3, 4, 27, 29, 31, 32
Little or zero discharge
5, 6, 7, 8, 16, 30, 32
Insufficient discharge flow/pressure
5, 6, 9, 10, 11, 12, 26, 30
Excessive power consumption
6, 9, 13, 28, 30
Excessive current draw
6, 13, 14, 15, 19, 21, 26, 30
Excessive pump vibration/noise
5, 7, 9, 10, 12, 13, 15, 16, 17, 25, 26, 30, 31
Pump runs & motor protection trips
17, 18, 19, 20, 21, 28
Pump runs manually, but not automatically
22, 23, 24
Pump runs hot
7, 13, 18, 19, 25, 26, 28
Listing of Possible 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 or jammed check 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. Damaged bearings.
16. High system head causing pump to operate at
extremely reduced capacity.
17. Object stuck inside impeller.
18. Motor not receiving proper 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.
25. Air Captured in Cooling Jacket.
26. Pump not properly seated on Auto Coupling.
27. Water intrusion through junction box.
28. Run capacitor size too large.
29. Start capacitor size too small.
30. Profile seal not sealing or missing.
31. VFD or Soft Start not functioning properly.
32. Start Relay or Capacitors damaged. (1 ph)
Please note that some possible causes may not
relate to your particular model.
If you need additional help, please contact
your local distributor or e-mail
[email protected]
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