HOMA A Series - Manual (Page 7)

A 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, 28, 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, 26, 30
Excessive pump vibration/noise
12, 15, 16, 25, 26, 28, 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, 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 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. VFD or Soft Start not functioning properly.
29. Run capacitor size too large (1ph).
30. Start capacitor size too small (1ph).
31. Profile seal not sealing or missing.
32. Start relay or capacitor damaged (1ph).
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
service@ homapump.com
Pg. 7