DAU-20 Instruction Manual
17
6-5 Trouble Check List
Table 6 -3 Trouble Check List
Trouble
contents
Cause
How to resolve problem
Refer
ence
Start failure ·
Rotation failure of
pump
(1) Not connected to power supply
(1) Connected to power supply
(2) Switch is not turned ON
(2) Push switch to | side
(3) Abnormal voltage of power source input
(3) Adjust voltage fluctuation to lower than
±10%
(4) Wire connection to pump failure
(4) Conduct wire connection to pump again.
Consult factory.
3-4.
(5) Circuit breaker tripped
(5) Investigate cause of breaker trip
(6) Thermal protector operated
(6) Shut off power supply and eliminate cause
of protector operation.
Consult factory.
4-2.
(7) Ambient atmosphere is low temperature
(7) Adjust temperature 5 to 40
℃
(41 to 104
degF)
4-3.
(8) Voltage drop
(8) Adjust supply voltage, evaluation of supply
cable
(9) Power source is failed
(9) Replace or repair
(10) Power switch failure
(10) Replace or repair
(11) Disconnection of cord
(11) Replace or repair
(12) Motor failure
(12) Replace or repair
(13) Damage or connection failure of capacitor (13) Replace or repair
(14) Locked connecting rod
(14) Disassembly / inside inspection of pump
head
(15) Abnormal bearing
(15) Replacement
6-4.
(16) Miscellaneous. Damage of pump internal
parts
(16) Overhaul (replacement of damaged
parts)
6-4.
Pressure failed to
drop
(1) Pump is small for cubic capacity of vacuum
chamber
(1) Select pump again
(2) Pressure measuring method of is wrong
(2) Measure pressure correctly
5-1.
(3) Vacuum gauge is not appropriate
(3) Measure with a vacuum gauge that covers
pressure range to measure and calibrated
5-1.
(4) Connected piping to inlet port is small or
length of piping is long
(4) Connect piping thicker than the inlet port
inside diameter and make distance from
the vacuum chamber
5-1.
(5) Ambient temperature is not appropriate
(5) Adjust temperature 5 to 40
℃
(41 to 104
degF)
(6) Leakage from inlet pipe
(6) Cleaning, replacement
(7) Leakage from piping and joint
(7) Investigate leak, diameter, length of piping
and repair
(8) Foreign material is in the pump
(8) Removal of foreign material, disassembly
cleaning or replacement
(9) Abnormality occurred in the pump by
absorbing fluid, condensable gas
(9) Overhaul (replacement of valve,
diaphragm, etc.)
6-4.
(10) Damage of inlet / exhaust valve
(10) Replacement
6-4.
(11) Damage of diaphragm
(11) Replacement
6-4.
(12) Miscellaneous. Pump internal parts were
damaged
(12) Overhaul (replacement of damaged parts)
