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Problem
Motor is
overheated.
Discharge
volume is
suddenly
lowered.
Pump
vibrates.
When Discharge
Valve is Closed
When Discharge
Valve is Opened
Pointer of
vacuum gauge
indicates high
value.
Cause
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Voltage is lowered.
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Overload.
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Ambient temperature is
high.
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Strainer is clogged with
foreign matter.
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Foundation is defective.
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Anchor bolt is loose.
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Suction pipe is closed.
Cavitation is caused.
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Wear or melting of pump
bearing.
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Magnet capsule or spindle
is damaged.
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Dynamic balance of drive
magnet assembly fluc-
tuates.
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Impeller and/or magnet
capsule is in contact with
fixing section.
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Wear of motor bearing.
Inspection and
Countermeasures
K
Check whether the voltage and
frequency levels are adequate.
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Check whether the specific
gravity and viscosity of liquid
are adequate.
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Improve air ventilation.
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Eliminate foreign matter.
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Reinstall.
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Retighten bolts.
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Clean, and eliminate cause of
cavitation.
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Replace.
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Replace.
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Eliminate cause or replace.
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Replace.
K
Replace bearing or motor.
Symptom
