Symptom
Cause
Remedy
The motor requires excessive
power.
The head is lower than the rating
and the pump has too much liq-
uid.
Install a throttle valve.
The liquid is heavier than ex-
pected.
Check the specific gravity and viscosity.
The head is higher than the rat-
ing, which is at capacity.
Check the impeller diameter.
The rotating parts are binding or
are severely worn.
Check the internal wearing parts for proper clear-
ances.
The motor rotation is incorrect.
Correct the wiring.
The condition monitoring de-
vice shuts down the pump.
The sleeve and thrust bearings
are damaged.
Replace as required.
There is a plugged recirculation
circuit.
Disassemble and remove the blockage. Then de-
termine and correct the cause of the blockage.
There is recirculation liquid va-
porization.
Correct all of these as necessary:
•
Check the actual liquid temperature versus
the design temperature.
•
Check the actual NPSH available versus the
design.
•
Check the minimum flow requirement for the
pump size.
The containment shell is dam-
aged.
Replace as required.
The magnets are de-coupling.
Check the temperature and viscosity of the pump-
ed fluid. Check the magnets with a breakaway tor-
que test.
The pump is running dry.
•
Check the control device for proper opera-
tion.
•
Check the suction line for blockage.
•
Reprime the pump.
There is excessive motor power. The system head is lower than the rating and
pumps too much liquid.
Check the rotating parts for binding and wear. The
liquid is heavier than expected.
7.2 Alignment troubleshooting
Symptom
Cause
Remedy
Horizontal (side-to-side) align-
ment cannot be obtained (angu-
lar or parallel).
The driver feet are bolt-
bound.
Loosen the pump's hold-down bolts, and slide the pump
and driver until you achieve horizontal alignment.
The baseplate is not
leveled properly and is
probably twisted.
1.
Determine which corners of the baseplate are
high or low.
2.
Remove or add shims at the appropriate cor-
ners.
3.
Realign the pump and driver.
Vertical (top-to-bottom) align-
ment cannot be obtained (angu-
lar or parallel).
The baseplate is not
leveled properly and is
probably bowed.
1.
Determine if the center of the baseplate should
be raised or lowered.
2.
Level screws equally at the center of the base-
plate.
3.
Realign the pump and driver.
7.2 Alignment troubleshooting
Model 3296 EZMAG Installation, Operation, and Maintenance Manual
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