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 megaohms.
2. If the insulation is less, then do the following:
Contact a sales or authorized service representative.
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 a sales or authorized service representative.
There is a malfunction in the overload
protection.
Replace the overload protection.
If the problem persists, then contact a sales or authorized service representative.
Always state the serial number of the product, see Product Description on page 11.
7.6 The pump delivers too little or no water
DANGER: Crush Hazard
Moving parts can entangle or crush. 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
The permanent-magnet motor generates voltage when the shaft rotates, even if power
sources are disconnected. Never perform any electrical work if the shaft could rotate.
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, then transpose two phase leads.
•
If it is a 1-phase pump, then do the following:
Contact a sales or authorized service representative.
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. To ensure a free flow, clean out the pipes.
The pipes and joints leak. Find the leaks and seal them.
7 Troubleshooting
Flygt 3102 Installation, Operation, and Maintenance Manual 69
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