VAT 642 Series - Page 94

TROUBLE SHOOTING Series
642
94/119 Edition 2017-11-24 742280ED
Failure
Check
Action
PRESSURE CONTROL not optimal
- Setup done completely?
- LEARN done?
- ZERO performed before LEARN?
- LEARN interrupted?
- Was gas flow stable during LEARN?
- Tuning done?
- Is sensor range suited for application?
- Noise on sensor signal?
- Perform «Setup procedure»
completely.
- Perform LEARN. Refer to «LEARN» for
details.
- Perform ZERO then repeat LEARN.
Refer to «Setup procedure» for details.
- Repeat LEARN. Refer to «LEARN» for
details.
- Repeat LEARN with stable gas flow.
Refer to «LEARN» for details.
- Tune valve for application. Refer to
«Tuning of control performance» for
details.
- Use a sensor with suitable range
(controlled pressure should be >3%
and < 98% of sensor full scale).
- Make sure a shielded sensor cable is
used.
If you need any further information, please contact one of our service centers. You will find the
addresses on our website: www.vatvalve.com.