EBARA GS - Troubleshooting Guide; Pump Fault Diagnosis

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Troubleshooting
Although the equipment usually functions according to the user's requirements, in some cases its
operation may not come up to expectations due to problems with the system or the power supply. The
following table may be useful in finding possible solutions in the event of failures or malfunctions:
1. Pump
Fault
Causes
Measures to be taken
The motor will not start
- The control panel is not working
correctly.
- Motor failure.
- Faults in the power supply.
- Friction on rotation shaft.
- Pump clogged.
- Check all conditions.
- Repair the motor.
- Check and repair.
- Rotate it by hand. Reassemble.
- Repair in specialist workshop.
- Remove foreign bodies.
There is no priming
- Foreign bodies in the foot valve.
- Malfunction in the bottom valve.
- Water leakage from the suction pipe.
- Air entering the suction pipe or seal.
- Remove foreign bodies.
- Replace the valve.
- Check the suction pipe.
- Check the suction pipe and
mechanical seal.
The pump has no flow
rate
- The pump does not turn.
- The delivery valve is closed or
half-closed.
- The suction head is too high for the
pump.
- Check that the impeller is free.
- Open the valve.
- Check the project.
Low flow rate
- The direction of rotation is not correct.
- Low rotation speed.
- Low voltage.
- Blocking in the bottom valve or in the
filter.
- Impeller is blocked.
- Pipe clogged.
- Air entering the system.
- Leakage in the delivery pipe.
- Impeller worn.
- Significant head losses in the system.
- Liquid temperature very high. The liquid
is volatile.
- Cavitation.
- Correct the electrical connections.
- Measure the RPM with a
tachometer.
- Check the power supply.
- Remove foreign bodies.
- Check and repair the suction pipe
and shaft seal.
- Check and repair.
- Check the impeller.
- Review the project.
- Review the project.
- Seek expert advice.
Water comes out initially
and then stops abruptly
- The pump has not been primed.
- Air entering the system.
- Air bubbles in the suction pipes.
- The suction head is too high for the
pump.
- Prime the pump correctly.
- Check and repair the suction pipe
and shaft seal.
- Vent the pipes.
- Review the project.