page 81 of 105
Troubleshooting
Fault
Possible cause
Remedy
❑
No display.
➨
Electrical power cord
not plugged in, electri-
cal supply failure?
✔
Plug in power cord.
Check fuse.
➨
Device fuse blown?
✔
Identify cause of failure.
Replace device fuse.
➨
Controller CVC 3000
or pump NT VARIO /
VARIO-B switched off?
✔
Switch on controller and/
or pump.
➨
VACUU • BUS cable
between pump and
controller not plugged
in at controller?
✔
Plug in VACUU • BUS
cable at CVC 3000 con-
troller.
➨
Other than above men-
tioned causes?
✔
Contact local distributor.
❑
Display disappears.
➨
Too much load (e.g.,
valves) connected?
✔
Check current draw of the
connected devices.
➨
Short circuit at connect-
ed valves?
✔
Replace valves.
➨
Short circuit at the
RS 232 plug?
✔
Check plug and cable.
➨
Other than above men-
tioned causes?
✔
Contact local distributor.
❑
Pressure reading
incorrect.
➨
Pressure transducer
decalibrated?
✔
Readjust VSK 3000.
➨
Humidity in the mea-
surement chamber?
✔
Let the pressure trans
-
ducer dry, e.g., by pump-
ing. Readjust if neces-
sary. Determine and
eliminate the cause for
humidity.
➨
Pressure transducer
contaminated?
✔
See ”Cleaning the pres-
sure transducer”.
➨
Other than above men-
tioned causes?
✔
Contact local distributor.
❑
Digital pressure
reading is flash
-
ing, display shows
”0.0”.
➨
Pressure transducer
not correctly adjusted
under vacuum?
✔
Adjust VSK 3000 cor-
rectly.
