User Manual

Documents are only to be used and distributed completely and unchanged. It is strictly the users’ responsibility to check carefully
the validity of this document with respect to his product. Manual-no.: 999164 / 19/05/2009
page 54 of 75
Fault Possible cause Remedy
❑
Pump does not achieve
its ultimate vacuum or
usual pumping speed.
➨
Outgassing substances or
vapour generated in the proc-
ess?
✔
Check process parameters.
➨
Diaphragms or valves defec-
tive?
✔
Replace diaphragms and/or
valves.
➨
Pump too hot?
✔
Allow pump to cool down.
Determine and eliminate the
cause of overheating.
➨
Pressure below ”Minimum” in
Auto mode?
✔
Adapt switch off pressure
(”Minimum”) if necessary.
❑
Pump too noisy.
➨
Loud exhaust noise?
✔
Connect hose or silencer to
pump outlet.
➨
Diaphragm crack or dia-
phragm clamping disc loose?
✔
Perform maintenance.
➨
Other than above mentioned
causes?
✔
Contact local distributor.
❑
Pump seized.
✔
Contact local distributor.
A service manual with exploded view drawings, spare parts list and directions for
repair is available on request.
☞ The service manual is intended for trained service people only.
NOTICE
* only if ”Sound” ”On” is selected
** VMS: Vacuum management system to switch non-VARIO pumps