Heidolph ROTAVAC 20 - Manual (Page 21)

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.: 01-005-005-36-1
page 21 of 35 Translation of the original instructions
5 Troubleshooting
Fault Possible cause Remedy
❑ Pump does not start or
stops immediately.
➨ Supply voltage too low or
power supply failure?
✔ Check supply voltage. Check
fuse.
➨ Control signal for motor speed
is missing?
✔ Check control signal.
➨ Pressure in outlet pipeline too
high?
✔ Remove blockade 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 mains.
❑ Pump does not achieve
its ultimate vacuum or
usual pumping speed.
➨ Leak in the pipeline or vacu-
um system?
✔ Check pump directly - con-
nect vacuum gauge directly
at pump inlet - then check
connection, pipeline and
vacuum system if necessary.
➨ Long, narrow 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 dam-
aged?
✔ Replace diaphragms and/or
valves.
➨ Outgassing substances or va-
por generated in the process?
✔ Check process parameters.
➨ Pump temperature too high
(motor speed reduced)?
✔ Ensure sufficient cooling of
the pump or reduce inlet pres-
sure.
❑ 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.