－28－
6.4 Trouble check list
Table5. Trouble check list
Problem Cause Measures Reference
①The pump is not connected to the
power supply.
①Connect the pump to the power
supply.
３．４
②The power switch is not turned
on.
②Turn on the power switch. ４．２
③ Problem with power supply
voltage.
③Set the power supply voltage to
within ±10% of the rated
voltage.
３．５
④The overload protector has
actuated.
④Wait till the temperature goes
down to 76 ± 15℃.
４．５
⑤The motor malfunctions. ⑤Replace the motor. ６．２
⑥ Low ambient temperature has
increased the oil viscosity.
⑥Increase the ambient
temperature to 7℃ or more.
４．４
⑦The entrance of foreign matter
into the pump caused the rotor
to burn out.
⑦Overhaul (replace the cylinder
and rotor).
６．２
⑧ Moisture or solvents were
sucked in, forming rust inside
the pump.
⑧Overhaul (replace the cylinder
and rotor).
６．２
⑨Reaction product accumulated in
the pump when the pump stops
after exhausting reactive gas.
⑨Overhaul (cleans the pump
inside and removes reaction
products).
６．２
⑩ Water absorption expands the
vanes.
⑩Overhaul (replace the vanes). ６．２
The pump does not
rotate.
⑪ Components inside the pump
have burnt out.
⑪Overhaul (replace the damaged
components).
６．２
① Problem with power supply
voltage.
①Set the power supply voltage to
within ±10% of the rated
voltage.
３．５
②Defective wiring to the pump. ②Perform wiring to the pump
again.
３．４
③ Low ambient temperature has
increased the oil viscosity.
③Increase the ambient
temperature to 7℃ or more.
４．４
The pump’s
rotation is unstable.
④Foreign matter has entered the
pump.
④Disassemble and clean the
pump to eliminate foreign
matter.
６．２
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