Troubleshooting
75GA02411_002_C0 - 10/2016 - © Leybold
Malfunction Possible cause Remedy Responsibility
Pump does not
start up.
Defective wiring.
Motor protection switch incorrectly set up.
Supply voltage does not match motor specs
Defective motor.
Pump has seized.
Links in the motor junction box.
Check wiring and repair it.
Correctly set up motor protection switch.
Repair pump.
Change links according to wiring
diagram.
Electrician
Electrician
Service
Service
Electrician
Motor protection
switch has
tripped.
Motor protection switch set wrongly.
Pumping chamber soiled, rotors do not turn
freely.
Bearing or gear damage.
Motor defective.
Notice: Do not restart the pump after the
motor protection switch has tripped without
having repaired the cause of the tripping.
Set the motor protection switch correctly.
Disassemble and clean the pump.
Repair pump.
Check if rotors turn freely, measure motor
resistance, replace motor if required.
Electrician
Service or
trained Staff
Service
Electrician,
Service
Pump does not
attain its ultimate
pressure.
Unsuitable measurement method or measuring
instrument.
External leak.
Degassing caused by water residues.
Severe contamination of the pump owing to
the process.
Contaminated discharge line.
Caution: if previously oil-sealed pumps were
used, use only clean and oil free pipes.
Exhaust pressure is too high (+ 200 mbar
maximum above ambient pressure).
Pump temperature is too low.
Use correct method of measurement and
measuring instrument. Measure the pres-
sure directly at the inlet port of the pump.
Repair pump.
Operate the pump for 30 minutes if possi-
ble with gas ballast, check process.
Disassemble pump and clean it. Check the
inside of the silencer and if required replace
silencer.
Clean discharge line and thereafter operate
the pump with the gas ballast running, if
possible.
Optimise the cross-section of the discharge
line (if required clean discharge line).
Leave the pump to run warm (> 1 h).
-
Service or
trained staff
Pumping speed
of the pump is
too low.
Clogged intake screen in the intake port.
Connection line too narrow or too long.
Discharge backpressure is too high.
Nominal pumping speed is too low.
Clean intake screen.
Install sufficiently wide connecting lines
which are as short as possible.
Precaution: install a dust filter in the intake
line. Replace filter element.
Optimise the cross-section of the discharge
line.
Check application.
After switching
the pump off in
the presence of
a vacuum the
pressure in the
system increases
too rapidly.
Leaky system.
Missing valve for shutting off the intake port
(automatically upon pump standstill).
Valve at the intake port is not closed.
Check system.
Fit a valve to shut off the intake port.
Close the valve at the intake port.
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