32
6.5 Trouble shooting list
Table-4 Trouble shooting list
Trouble
Cause
Procedure
Note
No rotating pump ①No connecting power
②Power switch off
③Abnormal input voltage
④Overload relay operated
⑤Inferior motor
⑥High oil viscosity at low
temperature
⑦Sticking the rotor by coming
different objects into the
pump
⑧Generating rust inside the
pump by evacuating water
vapor or solvent
⑨After evacuating reactive
gases, reacted materials
deposited inside the pump
⑩Internal parts damaged
①Connect power cord
②Turn on power switch
Adjust input voltage within
±10%
③Reset button switch
④Replace motor
⑤Warm atmosphere above +7℃
⑥Overhaul and repair (change
cylinder or rotor)
⑦Overhaul and repair (change
cylinder or rotor)
⑨Overhaul and repair (clean
and eliminate any reacted
materials inside the pump)
⑩Overhaul and repair (change
the parts)
3.4
4.2
3.5
4.5
4.4
6.2
6.2
Irregular rotation
of the pump
① Abnormal input voltage
② Inferior wire connect ion to
the pump
③ High oil viscosity at low
temperature
④ Coming different objects
into the pump
① Adjust input voltage within
±10%
② Connect wire again to the
pump
③ Warm atmosphere above +7℃
④ Eliminate different objects
then overhaul and repair the
pump
3.5
3.4
4.4
No pressure
reduction
①Low pumping capacity for
vacuum vessel volume
②Vacuum pressure measuring
is not correct
③Inadequate applying vacuum
gauge
④Small diameter and long
suction tubing
⑤Clogged the different
objects on the mesh filter
inside the inlet port
⑥Insufficient quantity of
the oil
⑦Oil deteriorated
①Re-select the pumping
capacity
②Measure the vacuum pressure
correctly
③Apply the corrected vacuum
gauge adapted to measuring
pressure range
④Connect same diameter
tubing with inlet port
(suction) and short
distance to the vacuum
vessel
⑤Disconnect the suction
tubing, clean the mesh
filter
⑥Fill the oil up to the
specified quantity
⑦Change the oil
5.2
5.1
5.1
6.2
3.2
6.3
