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6.5 Troubleshooting List
Table 6.3 Troubleshooting List
Problem
Causes
Solutions
Reference
Problems with
starting and
rotation of
pump
(1) Not connected to power supply.
(1) Connect power supply.
(2) The main power supply switch is not
ON.
(2) Set switch to I.
(3) Problem with power supply voltage.
(3) Ensure that voltage variation is within
+/-10%.
3-6
(4) Problem with pump wiring.
(4) Rewire the pump and contact the
manufacturer.
3-4
3-5
(5) The breaker has operated.
(5) Investigate the reasons for operation.
(6) The thermal protector has operated.
(6) Switch power OFF, and eliminate the cause
of operation of the relay. Contact the
manufacturer.
4-2
(7) Low ambient temperature.
(7) Ensure that ambient temperature is
ambient temperature range of product
specification.
4-3
(8) Low voltage.
(8) Adjust the power supply voltage, and check
the power supply cable.
3-4
3-6
(9) Fault in power supply.
(9) Replace or repair.
(10) Problem with power supply switch.
(10) Replace or repair.
(11) Broken wire in power cord.
(11) Replace or repair.
6-3
(12) Problem with motor.
(12) Replace or repair.
6-3
(13) Locked connecting rod.
(13) Dismantle the head cover and cylinder, and
check the interior.
6-3
(14) Problem with bearings.
(14) Replace.
6-3
(15) Miscellaneous damage to pump
components.
(15) Disassemble and repair (replace damaged
components).
6-3
Pressure does
not diminish.
(1) Pump is too small for capacity of
vacuum vessel.
(1) Select another pump.
5-1
(2) Pressure measurement is incorrect.
(2) Measure the pressure correctly.
5-1
(3) Vacuum gauge is unsuitable.
(3) Measure with a calibrated vacuum gauge
suitable for the pressure range.
5-1
(4) The inlet piping is too small in
diameter, or too long.
(4) Connect piping of an inside diameter
greater than the inlet diameter, and reduce
the distance between the pump and
vacuum vessel.
5-1
(5) Low voltage.
(5) Adjust the voltage, and check the power
supply cable.
3-6
(6) Ambient temperature unsuitable.
(6) Ensure that ambient temperature is
ambient temperature range of product
specification
.
4-3
(7) Leaks in inlet piping.
(7) Clean and replace.
(8) Leaks from piping or connections.
(8) Check for leaks in piping, check diameter
and length of piping, and repair.
(9) Foreign matter inside pump.
(9) Remove foreign matter, disassemble and
clean, and replace components.
6-4
(10) Water or solvent etc has been
sucked into pump causing problems.
(10) Disassemble and repair (replace valves
and cup packing etc).
6-4
(11) Damage to motor.
(11) Replace and repair.
6-3
(12) Damage to inlet/outlet valve.
(12) Replace.
6-4
(13) Damage to cup packing.
(13) Replace.
6-4
(14) Miscellaneous damage to pump
components.
(14) Disassemble and repair (replace damaged
components).
6-3
Pump
surfaces are
abnormally
hot (more
than room
tempe
30 °C)
(1) Continuous operation with high
pressure gas.
(1) Do not run the pump continuously at
near-atmospheric pressure.
(2) High temperature gas.
(2) Fit cooling equipment (eg. gas cooler) to
the inlet.
(3) Problem with power supply voltage.
(3) Ensure that voltage variation is within
+/-10%.
3-6
(4) Motor has seized.
(4) See the section on problems with pump
rotation.
(5) The silencer is blocked.
(5) Clean and replace.
