EBARA ENR Instruction And Maintenance Manual page 24

Fault
- The control panel does not fulfill the start-up conditions.
- Motor damage.
Motor does not start - Power supplies anomalies.
- Friction on shaft. Seizing up.
- Pump clogged.
- Foreign matter in the foot valve.
- Worn foot valve seating.
No prime
- Leakage on suction pipe.
- Air entering the suction pipe or shaft seal.
- Has not been primed.
No discharge - The gate valve is closed or half closed.
- The suction head is too high for the pump.
- The rotation is inverted.
- Low speed.
- Low voltage.
- Blockage at the foot valve or filter.
- Impeller blocked.
- Pipe blocked.
Low discharge
- Air entering.
- Leakage on discharge pipe.
- Worn impeller.
- Large head losses on installation.
- High liquid temperature. Volatile liquid.
- Cavitation generated.
- Has not been properly primed.
Water comes out at
- Air entering.
the begining but
- Air pockets in the suction pipe.
stops inmediatly
- Suction head too high for the pump.
- Voltage too low and large difference between phases.
- 50 Hz pump is being used at 60 Hz.
- There is foreign matter in the pump.
Overloading - The mechanical seal is not properly installed.
- Damaged bearings.
- Friction in the rotation area. The shaft is bent.
- High liquid density and viscosity.
- Damaged bearings.
Bearing overheating
- Operating for a long time with the valves closed.
- Defective installation.
- Damaged bearings.
- Capacity too high.
- Capacity too low.
Vibration and/or noise - Impeller blocked.
- The rotation is inverted.
- Friction in the rotation area. The shaft is bent.
- Cavitation generated.
- Vibation in the pipes.
- Defective installation of the mechanical seal.
Excessive leakage - Damaged mechanical seal.
through the shaft seal - Excess pressure in discharge.
- Bent shaft.
- Stator broken.
- Stator short circuited.
- Stator earthed.
Does not work
- Bearings stuck.
- Low voltage.
- Lack of phases in the electric power supply.
- Operating with lack of phases.
- Large unbalance of voltage.
Abnormal noises or
- Friction between the stator and rotor.
excessive vibration
- There is foreign matter in the cooling fan.
- Defective motor installation.
- Large unbalance of voltage.
- Ventilation tract closed.
High motor temperature. - Wrong voltage.
Smoke and/or bad smell. - Bearings stuck.
- Stator short circuited.
- Stator earthed.
- Low voltage.
Low speed - Overloading.
- Defective electrical connection.
24
Causes
Table 3
Remedy for action
- Check all conditions.
- Repair the motor.
- Check and repair.
- Turn by hand. Reassemble. Repair at specialised workshop.
- Remove foreign matter.
- Remove foreign matter.
- Replace with a new one.
- Check the suction pipe.
- Check the suction pipe and the shaft seal.
- Prime it.
- Open the valve.
- Check the project.
- Correct the electrical connection.
- Measure with a tachometer.
- Check the power source.
- Remove foreign matter.
- Remove foreign matter.
- Remove foreign matter.
- Check and repair the suction pipe and shaft seal.
- Check and repair.
- Change the impeller.
- Restudy the project.
- Restudy the project.
- Consult the experts.
- Prime properly.
- Check and repair the suction pipe and shaft seal.
- Reinstall the pipe.
- Restudy the project.
- Check the electric power source.
- Check the data of the nameplate.
- Remove foreign matter.
- Install correctly.
- Replace bearings.
- Repair at a specialised workshop.
- Restudy the project.
- Replace bearings.
- Avoid such situation by opening the valve or stop the pump.
- Check the state of the installation.
- Replace bearings.
- Adjust the capacity by opening the discharge valve.
- Adjust the capacity by closing the discharge valve.
- Remove foreign matter.
- Check and correct the connection.
- Repair at specialised workshop.
- Consult the experts.
- Reform the piping.
- Install correctly.
- Replace the mechanical seal.
- Restudy the project.
- Repair at specialised workshop.
- Repair at specialised workshop.
- Repair at specialised workshop.
- Repair at specialised workshop.
- Repair.
- Change the nominal voltage.
- Check the power source.
- Check the power source.
- Correct the unbalance of voltage.
- Align and/or replace the bearing.
- Remove foreign matter.
- Connect it to the pump properly.
- Correct the unbalance of voltage.
- Unblock.
- Change to a motor with the correct voltage.
- Repair the bearings.
- Repair at specialised workshop.
- Repair at specialised workshop.
- Correct the nominal voltage.
- Reduce current.
- Connect correctly. Tighten.
(ENGLISH)