Troubleshooting – VACUUBRAND MZ 2 VARIO-SP User Manual
Page 36
Fault
Possible cause
Remedy
❑ Pump does not
start or stops im-
mediately.
➨ Supply voltage is miss-
ing or is too low?
✔ Check or connect electri-
cal supply voltage.
➨ Control signal for motor
speed is missing?
✔ Check control signal.
➨ Overpressure in outlet
line?
✔ Remove blockage in line,
open valve, or reduce
overpressure.
➨ Motor overloaded?
✔ Allow motor to cool down,
identify and eliminate
cause of failure. Manual
reset is necessary. Sepa-
rate pump from supply
voltage.
❑ Pump does not
achieve its ultimate
vacuum or usual
pumping speed.
➨ Centring ring at small
flange connection not
correctly positioned, or
leak in the pipeline or
vacuum system?
✔ Check pump directly -
connect vacuum gauge
directly at pump inlet -
then check connection,
pipeline and vacuum
system if necessary.
➨ Long, narrow vacuum
line?
✔ Use lines with larger di-
ameter, length as short as
possible.
➨ Pump has been ex-
posed to condensate?
✔ Allow pump to run for
some minutes with atmo-
spheric pressure at the
inlet to purge.
➨ Deposits have been
formed inside the
pump?
✔ Clean and inspect the
pump heads.
➨ Diaphragms or valves
damaged?
✔ Replace diaphragms and/
or valves.
➨ Outgassing substances
or vapor generated in
the process?
✔ Check process parame-
ters.
➨ Pump temperature
too high (motor speed
reduced or pump
switched off)?
✔ Ensure sufficient cooling
of the pump or reduce
inlet pressure. Separate
pump from supply volt-
age if the pump has been
switched off.
Troubleshooting