VAT 642 Series Installation, Operating, & Maintenance Instructions page 51

Series 642
4.7.1.2 Sensor delay adjustment
Sensor delay adjustment effects: Stability
Default value is 0sensorDeay0. Adjustment range is from 0 to 1.0s.
Pipes and orifices for sensor attachment delay response time and so badly impact pressure control
stability.
By adapting this parameter to the approximate delay time stability problems can be reduced. But control
response time will be slowed down by this measure.
Adjustment procedure:
1. Start with gain factor 1.0 and sensor delay 0s.
2. Open valve.
3. Control a typical pressure / flow situation.
4. Repeat from step 2 with higher sensor delays until best possible stability is achieved.
5. Adjustment gain factor again. Refer to «Gain factor adjustment».
Local operation:
('Control View', 'Control Performance Analyzer' or
'Service Box 2')
Go to 'Setup / Control Parameter' menu.
Select sensor delay.
605403ED
INSTALLATION
Whenever possible sensors should be attached to the chamber according to
«Requirements to sensor connection». This is the most effective measure against
stability issues. If your gauge attachment fulfills these criteria do not use this
parameter.
Edition 2017-11-24
Remote operation:
It's not possible to do 'Sensor delay
adjustment' via remote operation.
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