Problem
Cause (Reference page)
Action (Reference page)
Overload and
overcurrent of the
motor
The discharge rate is high.
Throttle the sluice valve to adjust the rate as per
the specifications.
A rotating part is in contact with another part.
Contact Teral or our servicing companies
because disassembly and inspection are
required.
Foreign objects enter into the pump.
Overheat of
bearing
The bearing is worn or damaged. (5-1)
Contact Teral or our servicing companies
because disassembly and inspection are
required.
The grease is deteriorated. (5-1)
The pump is run dry.(4-3)
Do not perform shutoff operation for more than
one minute continuously.(4-3)
Incorrect installation of the pump and the
piping (3-1)
Check and correctly install them.
Unusual noise
and unusual
vibration of the
pump
The bearing or the bearing metal is worn or
damaged.
Contact Teral or our servicing companies
because disassembly and inspection are
required.
The impeller is clogged with foreign matter,
thus leading to imbalanced load.
A rotating part is in contact with another part.
The main shaft is winding.
Abnormal noise from the shaft seal
(mechanical seal).(5-1)
The motor is running in open-phase condition.
Check the wiring and repair or replace.
Cavitation has occurred. (3-6)
Consult Teral or our servicing companies.
Incorrect installation of the pump and the
piping (3-1)
Check and correctly install them.
The pump main shaft is not correctly
positioned.
Adjust the pump main shaft. (5-3)
An inverter-driven motor generates a magnetic
sound. (3-8)
Change the operating frequency or carrier
frequency.
The pipes are resonating.
Check and adjust the piping.
An abnormal
amount of water
is leaking from
the shaft seal.
Damage to the mechanical seal. (5-1)
If the leakage becomes large, replace the seal.
Contact Teral or our servicing companies
because disassembly and inspection are
required.
The positive suction pressure is high.
Reconsider the specification.
When turning off
the power, the
pump rotates
reversely.
The foot valve or the check valve has failed.
Check and replace the foot valve and the check
valve.
Leakage occurs in the suction piping.
Check and repair the piping.
