6-1
6. Troubleshooting
The following table lists causes of failures and their measures. In the event of a failure, however, you
should carefully investigate the problem and ask the vendor to carry out any measures that are considered
difficult.
Problem Cause (Reference page) Measures (Reference page) Operator *
Wiring is disconnected or broken.(3-4)
Check the wires and connections.
Repair or replace.
Vendor
The power fuse is blown. Replace it with an appropriate fuse. User
Tripping of the thermal relay Check the thermal relay. User
Poor connection or contact of power
wires(3-4)
Check the wires and connections. Vendor
The power voltage is too low.(2-2)
Check the power voltage.
Contact the power company.
User
The motor has failed. (e.g. wire breakage of
the stator winding)
Repair at vendor's shop.
Contact the vendor because disassembly
and inspection are required.
Vendor
Foreign matter is caught in the impeller.
Disassemble, clean, and repair.
Contact the vendor because disassembly
and inspection are required.
Vendor
The pump does
not start.
The bearing is rusty.(5-1)
Replace the bearing.(5-1)
Contact the vendor because disassembly
and inspection are required.
Vendor
The rotating speed is too high. Check with the tachometer. User
The voltage is too high or too low.(2-2)
The voltage is unbalanced.
Check the power voltage.
Contact the power company.
User
The stator winding is broken, shorted, and
grounded.
Contact the vendor because disassembly
and inspection are required.
Vendor
The stator and rotor are in contact due to
wear of the bearing.(5-1)
Replace the bearing.(5-1)
Contact the vendor because disassembly
and inspection are required.
Vendor
Open-phase failure occurs. Check the wiring. User
The dynamic viscosity of the liquid used is
too high. (2-2)
Use a liquid with low dynamic viscosity. User
The discharge rate is high.
Throttle the sluice valve to meet the
specifications.
User
Overload and
overcurrent of the
motor
The rotating part is in contact with another
part.
Contact the vendor because disassembly
and inspection are required.
Vendor
Lots of air bubbles are contained in the
liquid used.
Avoid bubbling and the suction of air
bubbles.
User
The rotation direction is reverse.(4-2)
Correct the wiring so that the direction is
normal.(4-2)
User
The piping loss is high.
Check the piping diameter, route and
length.
User
The piping is clogged up with foreign
matter.
Remove the foreign matter, and check the
connections.
User
The impeller is worn.
Replace the impeller.
Contact the vendor because disassembly
and inspection are required.
Vendor
Foreign matter is accumulated on the
impeller and in the casing.
Remove the foreign matter, and check the
connections.
Contact the vendor because disassembly
and inspection are required.
Vendor
The pump starts,
but cannot
achieve the
specified
discharge rate
and the specified
head.
The rotating speed is low. Check with the tachometer. User
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