Heidolph ROTAVAC Vario pumping unit - Manual (Page 48)

page 48 of 61
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.: 999248 / 28/04/2011
Attention: All error messages including a flashing warning triangle have to be confirmed (de-
leted) by pressing key START/STOP.
Fault Possible cause Remedy
❑ Pump does not achieve
ultimate vacuum or nor-
mal pumping speed.
➨ Wrong settings at controller? ✔ Select function ”Pump down”
with speed set to ”HI” and
check again.
➨ Centring ring at a small flange
connection not correctly posi-
tioned or leak in the pipeline
or vacuum system?
✔ Check pump directly - con-
nect controller directly at
pump inlet - then check con-
nection, 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 atmospheric
pressure at the inlet.
➨ Deposits have been formed
inside the pump?
✔ Clean and inspect the pump
heads.
➨ Diaphragms or valves defec-
tive?
✔ Replace diaphragms and/or
valves.
➨ Outgassing substances or
vapour generated in the proc-
ess?
✔ Check process parameters.
➨ Pump too hot? ✔ Allow pump to cool down.
Determine and eliminate the
cause of overheating.
➨ Pressure for automatic
switching off reached?
✔ Adapt pressure for automatic
switching off, if necessary.