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7.4 The pump runs but the motor protection
trips
DANGER: Crush Hazard
Moving parts can entangle or crush. Always disconnect and
lock out power before servicing to prevent unexpected start-
up. Failure to do so could result in death or serious injury.
NOTICE:
Do NOT override the motor protection repeatedly if it has tripped. Do-
ing so may result in equipment damage.
Cause
Remedy
The motor protection
Set the motor protection according to the da-
is set too low.
ta plate and if applicable the cable chart.
The impeller is difficult
• Clean the impeller.
to rotate by hand.
• Clean out the sump.
• Check that the impeller is properly trim-
med.
The drive unit is not
• Check the fuses. Replace fuses that have
receiving full voltage
tripped.
on all three phases.
• If the fuses are intact, then notify a certified
electrician.
The phase currents
Contact a sales or authorized service repre-
vary, or they are too
sentative.
high.
The insulation be-
1. Use an insulation tester. With a 1000 V DC
tween the phases and
megger, check that the insulation between
ground in the stator is
the phases and between any phase and
defective.
ground is > 5 megaohms.
2. If the insulation is less, then do the follow-
ing:
Contact a sales or authorized service rep-
resentative.
The density of the
Make sure that the maximum density is
pumped fluid is too
1100 kg/m3 (9.2 lb/US gal)
high.
• Change the impeller, or
• Change to a more suitable pump
• Contact a sales or authorized service rep-
resentative.
There is a malfunction
Replace the overload protection.
in the overload pro-
tection.
If the problem persists, then contact a sales or authorized service rep-
resentative.
Always state the serial number of the product, see
on page 4.
GFK-GFV Series Installation, Operation, and Maintenance Manual
7.5 The pump delivers too little or no water
NOTICE:
Do NOT override the motor protection repeatedly if it has tripped. Do-
ing so may result in equipment damage.
Cause
The impeller rotates in
the wrong direction.
One or more of the
valves are set in the
wrong positions.
The impeller is difficult
to rotate by hand.
The pipes are ob-
structed.
The pipes and joints
leak.
There are signs of
wear on the impeller,
pump, and casing.
The liquid level is too
low.
If the problem persists, then contact a sales or authorized service rep-
resentative.
Always state the serial number of the product, see
on page 4.
8 Technical Reference
Product Description
8.1 Motor data
Feature
Motor type
Frequency
Supply
Starting method
DANGER: Crush Hazard
Moving parts can entangle or crush. Always disconnect and
lock out power before servicing to prevent unexpected start-
up. Failure to do so could result in death or serious injury.
Remedy
• If it is a 3-phase pump, then transpose two
phase leads.
• If it is a 1-phase pump, then do the follow-
ing:
Contact a sales or authorized service rep-
resentative.
• 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.
• Clean the impeller.
• Clean out the sump.
• Check that the impeller is properly trim-
med.
To ensure a free flow, clean out the pipes.
Find the leaks and seal them.
Replace the worn parts.
• Check that the level sensor is set correctly.
• Depending on the installation type, add a
means for priming the pump, such as a
foot valve.
Description
Squirrel-cage induction motor
50 Hz or 60 Hz
1-phase or 3-phase
Direct on-line
8 Technical Reference
Product Description
17
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