7 Troubleshooting
7.1 Operation troubleshooting
Symptom
Cause
Remedy
Pump does not start.
The electrical circuit is open or not
complete.
Check the circuit and make any necessa-
ry corrections.
Rotor resists turning due to freezing.
Drain pump and dry internal surfaces with
dry air.
The impellers are binding against the
bowls.
Reset the impeller adjustment. See Instal-
lation for details.
The electric driver is not receiving
enough voltage.
Make sure that the driver is wired correct-
ly and receiving full voltage.
The motor is defective.
Consult an ITT representative.
The pump is not delivering liq-
uid.
The bowl assembly is not submerged
enough.
Adjust the liquid level in the sump as nec-
essary.
The suction strainer is clogged.
Remove the obstructions.
There is an obstruction in the liquid
passage.
Pull the pump and inspect the impeller
and bowl.
The discharge head is not properly
vented.
Open the vent.
The pump is not producing the
rated flow or head.
The impellers are not rotating fast
enough.
Make sure that the driver is wired correct-
ly and receiving full voltage.
The impellers are rotating the wrong di-
rection.
Make sure the impellers are spinning
clockwise when viewed from above.
Check the engagement of the motor cou-
pling.
The total pump head is too high.
Check the pipe friction losses. Use larger
discharge piping.
The liquid passages are partially ob-
structed.
Inspect the impellers and bowls and re-
move any obstructions.
There is cavitation.
Insufficient NPSH. Check for and remove
any obstructions in pump suction inlet.
The impellers are too high (semi-open
construction only).
Reset the impeller adjustment. See Instal-
lation for details.
There is not enough pressure.
The impellers are not rotating fast
enough.
Make sure that the turbine is receiving full
steam pressure.
The liquid passage is obstructed.
Inspect the impellers and bowls and re-
move any obstructions.
The impellers are rotating in the wrong
direction.
Make sure the impellers are spinning
clockwise when viewed from above.
Check the engagement of the motor cou-
pling.
The impellers are too high (semi-open
construction only).
Reset the impeller adjustment. See Instal-
lation for details.
The pump starts and then stops
pumping.
Excessive power is required.
Use a larger driver. Consult an ITT repre-
sentative.
The pump is pumping a higher viscosi-
ty or different specific gravity liquid
than it was designed to handle.
Test the liquid for viscosity and specific
gravity. Consult an ITT representative.
Critical parts have experienced me-
chanical failure.
Check the bearings, wear rings, and im-
pellers for damage. Any irregularities in
7 Troubleshooting
60
Model VCW Installation, Operation, and Maintenance
Summary of Contents for Goulds Pumps VCW
Page 1: ...Installation Operation and Maintenance Model VCW ...
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