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20901106_EN_MD4_MV2_VARIO_select_V1.0_140818
Troubleshooting
Fault
Possible cause
Remedy
❑
Readings deviate
from the reference
standard.
➨
Vacuum sensor dirty.
✔
Clean sensor measuring
chamber.
➨
Moisture in the sensor.
✔
Allow sensor measuring
chamber to dry, e. g., by
pumping.
➨
Sensor defective.
✔
Contact local distributor.
➨
Sensor measures in-
correctly. Sensor not
correctly adjusted.
✔
Adjust sensor with refer-
ence gauge.
❑
Sensor does
not pass on mea-
sured value.
➨
VACUU·BUS plug-in
connection or cables
defective or not con-
nected.
✔
Check VACUU·BUS plug-
in connection and cables
to the controller.
➨
Sensor defective.
✔
Contact local distributor.
❑
Venting valve does
not operate.
➨
VACUU·BUS plug-in
connection or cables
defective or not con-
nected.
✔
Check VACUU·BUS plug-
in connection and cables
to the controller.
➨
Venting valve dirty.
✔
Clean venting valve or
use another valve.
❑
Vacuum pump
does not start.
➨
Overpressure in the
outlet line.
✔
Open the outlet line.
Ensure clear passage.
➨
Condensation in the
vacuum pump.
✔
Allow pump to run for
some minutes with atmo-
spheric pressure at the
inlet to purge.
➨
Pump switched off.
✔
Switch pump on using
rocker switch.
➨
Power plug not correct-
ly plugged in or pulled
out.
✔
Check power supply and
cable.
➨
VACUU·BUS plug-in
connection or cables
defective or not con-
nected.
✔
Check VACUU·BUS plug-
in connection and cables
to the controller.
➨
See also section „ Error - Cause - Remedy“ in the manual of the
VACUU·SELECT vacuum controller
