VACUUBRAND PC 620 NT - Manual (Page 44)

page 44 of 63
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.: 999188 / 19/05/2009
Troubleshooting
Fault Possible cause Remedy
❑ No display. ➨ Mains not plugged in? ✔ Plug in mains plug of pump-
ing unit.
➨ Device switched off? ✔ Switch on device.
➨ VACUU • BUS cable to inter-
nal power supply not plugged
in at controller?
✔ Plug in VACUU • BUS cable
at controller CVC 3000.
➨ Other causes (device defec-
tive)?
✔ Contact local distributor.
❑ Display disappears. ➨ Too much load (e.g. valves)
connected?
✔ Check current draw of the
connected devices.
➨ Short circuit at connected
valves?
✔ Replace valves.
➨ Short circuit at the RS 232
plug?
✔ Check plug and cable.
➨ Other causes (device defec-
tive)?
✔ Contact local distributor.
❑ Pressure reading incor-
rect.
➨ Device not adjusted? ✔ Readjust CVC 3000.
➨ Humidity in the measurement
chamber?
✔ Let the pressure transducer
dry, e.g. by pumping. Read-
just if necessary. Determine
and eliminate the cause for
humidity.
➨ Pressure transducer contami-
nated?
✔ See „Cleaning the pressure
transducer“.
❑ Digital pressure read-
ing is flashing, ”0.0” is
displayed.
➨ Pressure transducer not
correctly adjusted under
vacuum?
✔ Adjust CVC 3000 correctly.
❑ No digital pressure read-
ing.
➨ Pressure transducer defec-
tive?
✔ Contact local distributor.
❑ Digital pressure reading
is flashing, one blip*.
➨ Overpressure at the pressure
transducer, pressure > 1060
mbar?
✔ Release pressure immedi-
ately (risk of bursting).
❑ Warning triangle and
black valve symbol are
flashing, two blips*.
➨ External venting valve re-
moved or defective?
✔ Connect valve or replace by
a new one or reconfigure
without valve.
❑ Warning triangle and
valve symbol are flash-
ing, three blips*.
➨ NT VARIO / VARIO-B pump
and in-line valve connected?
✔ Disconnect one component,
switch controller off/on.
❑ Warning triangle and
coolant valve symbol are
flashing, four blips*.
➨ Coolant valve removed or
defective?
✔ Check connection cable of
the valve or use new valve or
reconfigure without valve.