VACUUBRAND MV 10C NT VARIO o.C. - Manual (Page 48)

page 48 of 97
Troubleshooting
Fault Possible cause Remedy
❑ Pump does not
start or stops im-
mediately.
➨ Electrical power cord
not plugged in, electrical
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 ulti-
mate 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 exposed
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 too hot? ✔ Allow pump to cool down.
Determine and eliminate
the cause of overheating.
❑ Pump too noisy. ➨ Atmospheric or high
pressure at the pump
inlet?
✔ Connect hose or silencer
to pump outlet. Be careful
not to cause outlet over-
pressure, especially with
condensable vapors.