vacuubrand MD 4C NT, Instructions For Use Manual

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page 52 of 80
Fault Possible cause Remedy
❑ Pump does not
start or stops im-
mediately.
➨ Electrical power cord
not plugged in, electri-
cal supply failure?
✔ Plug in power cord.
Check fuse.
➨
Device fuse blown?
✔
Identify cause of failure.
Replace device fuse.
➨
Overpressure in outlet
line?
✔
Remove blockage in line,
open valve.
➨ Motor overloaded? ✔ Allow motor to cool down,
identify and eliminate
cause of failure. Manual
reset is necessary. Switch
off pump or unplug.
❑ 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.
Troubleshooting