14
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) Switch is OFF.
(2) Set switch to I.
(3) Problem with power supply voltage.
(3) Ensure that voltage variation is within
+/-10%.
(4) Problem with pump wiring.
(4) Rewire the pump. Contact the
manufacturer.
3-4.
(5) The breaker has operated.
(5) Investigate the reasons for operation.
(6) The thermal protection relay 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
0~40 °C.
4-3.
(8) Intake-side pressure is lower than
atmospheric pressure
(8) Set the intake-side pressure to
atmospheric pressure
4-3.
(9) Low voltage.
(9) Adjust the power supply voltage, and
check the power supply cable.
(10) Fault in power supply.
(10) Replace or repair.
(11) Problem with power supply switch.
(11) Replace or repair.
(12) Broken wire in power cord.
(12) Replace or repair.
(13) Problem with motor.
(13) Replace or repair.
(14) Damaged condenser, or connection
problem.
(14) Replace or repair.
(15) Locked connecting rod.
(15) Disassemble pump head and check
interior.
(16) Problem with bearings.
(16) Replace or repair.
6-4.
(17) Miscellaneous damage to pump
components.
(17) Disassemble and repair (replace
damaged components).
6-4.
Pressure does not
diminish
(1) Pump is too small for capacity of
vacuum vessel.
(1) Select another pump.
(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, or
reduce the distance between the pump
and vacuum vessel.
5-1.
(5) Ambient temperature unsuitable.
(5) Ensure that ambient
temperature is 0~40 °C.
(6) Leaks in inlet piping.
(6) Clean and replace.
(7) Leaks from piping or connections.
(7) Check for leaks in piping, check
diameter and length of piping, and
repair.
(8) Foreign matter inside pump.
(8) Remove foreign matter, disassemble
and clean, and replace components.
(9) Problem due to ingestion of liquid or
compressed gas into the pump.
(9) Disassemble and repair
(replace valves and diaphragm
etc).
6-4.
(10) Damage to inlet valve.
(10) Replace.
6-4.
(11) Damage to diaphragm.
(11) Replace.
6-4.
(12) Miscellaneous damage to pump
components.
(12) Disassemble and repair (replace
damaged components).
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%.
(4) Motor has seized.
(4) See the section on problems with pump
rotation.
