Homa TP 53 Originalbetriebsanleitung Seite 56

10.8. INSTALLATION / START UP TROUBLESHOOT-
ING:
Only authorized service personnel who are trained profes-
sionals shall troubleshoot and repair pumps that are expe-
riencing operational or performance difficulties.
All HOMA pumps are factory tested, yet startup dif-
ficulties 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
Pump will not start
Little or zero discharge
Insufficient discharge flow/pressure
Excessive power consumption
Excessive current draw
Excessive pump vibration/noise
Pumps runs & motor protection trips
Pumps run manually, but not automa-
tically
Pump runs hot
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 spec-
ified.
6. Incorrect impeller rotation direction.
7. Sump liquid level is below pump's minimum submer-
gence 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 mo-
tor.
15. Damaged bearings.
16. High system head causing pump to operate at ex-
tremely 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.
56 | EngliSH
Possible Causes
1, 2, 3, 4, 27, 28, 29, 31, 32
5, 6, 7, 8, 16, 30, 32
5, 6, 9, 10, 11, 12, 26, 30
6, 9, 13, 28, 30
6, 13, 14, 15, 19, 26, 30
12, 15, 16, 25, 26, 28, 31
17, 18, 19, 20, 21, 28
22, 23, 24
7, 19, 25, 26, 28
27. Water intrusion through junction box.
28. VFD or Soft Start not functioning properly.
29. Run capacitor size to large (1ph).
30. Start capacitor size to 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.
10.9. MAINTENANCE
Regular maintenance will help ensure longer pump life and
more reliable operation. It is recommended that pumps
in intermittent operation be inspected twice a year and
pumps in continuous operation be inspected every 1,000
hours. The following is a listing of required inspection and
maintenance items.
If any of the problems described in the following list
exists, stop operating the pump to avoid damage or
personal injury.
1. CABLE ENTRY
Make sure that the cable entry flange and strain relief
clamp are tight. If the cable entry is showing signs of
leakage remove cable from entry, remove grommet, cut
a piece of cable off so that the grommet seats on a new
portion of the cable, replace grommet, and reinstall cable
assembly, into the top of the motor.
Note: Explosion Proof cables are sealed with a Factory
Mutual Approved potting compound. Please consult
factory for instruction.
2. Cables
Inspect the cable for cuts, scrapes or sharp bends. If the
outer jacket is damaged, replace the cable. Splices of the
power or control cable within the wet well area are not
acceptable.
3. Motor insulation resistance
Megger the insulation between the phases; and between
any phase and ground. Resistance values should be great-
er than 1 M ohm. If abnormal readings are obtained, con-
tact authorized service center immediately.
4. External parts of pump
Make sure that all screws, bolts and nuts are tight. Check
the condition of pump lifting eyes and replace if damaged
or worn, Replace any external part that appears worn or
damaged.
5. Seal chamber oil
Seal chamber oil should be checked for signs of water
intrusion, or other impurities any time the pump is re-
moved from wet well. To check the condition of the oil,
remove the oil fill plug. Drain the chamber volume into a
transparent container. Visually check sample for impuri-
ties or emulsification (oil may appear cream-like if a small
amount of water is present). If significant water intrusion
has occurred, remove and replace lower mechanical seal.
Unless obvious mechanical damage has occurred to the
lower seal, it is good practice to replace the upper and
lower mechanical seals as a set. Refill seal chamber with
fresh oil to the bottom of fill plug port (when pump is in
vertical position) and replace oil fill plug.