Xylem Flygt 3201, Installation Operation & Maintenance, Page: 44 / 48

The pump runs but the motor protection trips
WARNING:
Always disconnect and lock out power before servicing to prevent unexpected startup.
Failure to do so could result in death or serious injury.
Cause Remedy
The motor protection is set too low. Set the motor protection according to the data plate.
The impeller is difficult to rotate by
hand.
• Clean the impeller.
• Clean out the sump.
• Check that the impeller is properly trimmed.
The drive unit is not receiving full
voltage on all three phases.
• Check the fuses. Replace fuses that have tripped.
• If the fuses are intact, notify a certified electrician.
The phase currents vary, or they are
too high.
Contact the local Xylem service shop.
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 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 11).
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.
NOTICE:
Do NOT override the motor protection repeatedly if it has tripped. Doing so may result in
equipment damage.
Troubleshooting
42 Flygt 3201 Installation, Operation, and Maintenance Manual