HOMA CH_H Series - Manual (Page 6)

CH Series
Installation / Startup Troubleshooting: Listing of Possible Causes:
1. Incorrect or no power supplied to motor. Only authorized service personnel who are
trained professionals shall troubleshoot and
repair pumps that are experiencing operational
or performance difficulties.
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.
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.
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. The following is a tabulation of common
start-up problems and possible causes.
11. Discharge valve partially closed.
12. Insufficient NPSHA (Dry Pit Application).
Symptom
Possible Causes
13. Actual system head is lower than specified
resulting in over pumping condition.
14. Voltage supply to motor is lower than
required by motor.
Pump will not start
`
1, 2, 3, 4, 27 15. Damaged bearings
16. High system head causing pump to operate
at extremely reduced capacity.
Little or zero discharge
5, 6, 7, 8, 16 17. Object stuck inside impeller.
18. Motor not receiving proper voltage on all
three phases.
Insufficient discharge flow/pressure
5, 6, 9, 10, 11, 12, 26 19. Phase/currents unbalanced or too high.
20. Insulation between phases and earth
ground,<1M-ohm.
Excessive power consumption
6, 9, 13 21. Density of the pumping media too high.
22. Defective level sensor.
23. Hand/Off/Auto switch not in Auto Position. Excessive current draw
6, 13, 14, 15, 19 24. Defective H/O/A switch , relay or contactor
coil.
25. Air Captured in Cooling Jacket Excessive pump vibration/noise
12, 15, 16, 25, 26 26. Pump not properly seated on AutoCoupling
27. Water intrusion through junction box
Pumps runs & motor protection trips
17, 18, 19, 20, 21
If you need additional help,
please call us at:
Pumps runs manually, but not automatically
22, 23, 24
1 (800) 452 - HOMA Pump runs hot
7, 19,
Pg. 6
Installation, Operation & Maintenance Manual