FLYGT 3153 - Technical Reference; Application Limits; Motor Data

Cause Remedy
The insulation between the phases
and ground in the stator is
defective.
1. Use an insulation tester. With a 1000 V DC megger, check that the
insulation between the phases and between any phase and ground is
> 5 megohms.
2. If the insulation is less:
Contact the local Xylem service shop.
The density of the pumped fluid is
too high.
Make sure that the maximum density is 1100 kg/m
3
(9.2 lb/US gal)
• Change the impeller, or
• Change to a more suitable pump.
• Contact the local Xylem service shop.
There is a malfunction in the
overload protection.
Replace the overload protection.
If the problem persists, refer to the Flygt Service Guide on the web or contact the local
Xylem service shop. Always state the serial number of your pump when you contact Xylem,
see Product Description (page 12).
The pump delivers too little or no water
WARNING:
Always disconnect and lock out power before servicing to prevent unexpected startup.
Failure to do so could result in death or serious injury.
WARNING:
Electrical hazard. A permanent magnet motor produces voltage when the shaft is rotating.
The conductors must be insulated.
NOTICE:
Do NOT override the motor protection repeatedly if it has tripped. Doing so may result in
equipment damage.
Cause Remedy
The impeller rotates in the wrong
direction.
• If it is a 3-phase pump, transpose two phase leads.
•
If it is a 1-phase pump:
Contact the local Xylem service shop.
One or more of the valves are set in
the wrong positions.
• Reset the valves that are set in the wrong position.
• Replace the valves, if necessary.
• Check that all valves are correctly installed according to media flow.
• Check that all valves open correctly.
The impeller is difficult to rotate by
hand.
• Clean the impeller.
• Clean out the sump.
• Check that the impeller is properly trimmed.
The pipes are obstructed. Clean out the pipes to ensure a free flow.
The pipes and joints leak. Find the leaks and seal them.
Troubleshooting
Flygt 3153 Installation, Operation, and Maintenance Manual 65