User guide

page 79 of 102
Fault Possible cause Remedy
❑
Controller does
not respond when
pressing keys (ex-
cept ON/OFF). ”P”
is displayed.
➨
Controller in remote
mode?
✔
Control VNC 2 controller
via interface or switch off
remote mode.
❑
Controller does
not respond when
operating any keys.
No change after
switching off/on.
✔
Contact local distributor.
❑
Pump does not
work.
➨
Pump too hot?
✔
Allow pump to cool down,
identify and eliminate
cause of failure. Manual
reset is necessary. Switch
off pump or unplug.
➨
Electrical power cord
not plugged in, electri-
cal supply failure?
✔
Plug in power cord.
Check fuse.
❑
Pump does not
start or stops im-
mediately.
➨
Motor overloaded?
✔
Allow motor to cool down,
identify and eliminate
cause of failure. Manual
reset is necessary. Switch
off pump or unplug.
➨
Overpressure in outlet
line?
✔
Remove blockage in line,
open valve.
➨
Pump has been ex-
posed to condensate?
✔
Perform maintenance.
❑
Pump does not
achieve its ultimate
vacuum or usual
pumping speed.
➨
Outgassing substances
or vapor generated in
the process?
✔
Check process parame-
ters.
➨
Leak in the tubing or in
the vacuum system?
✔
Check connections, pipe-
line and vacuum system.
➨
Wrong setting at con-
troller?
✔
Select mode ”continu-
ous pumping” and check
again.
➨
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.