VAT 650 Series Installation, Operating, & Maintenance Instructions page 53

3.10.1.1 Gain factor adjustment
The gain factor effects:
• Stability
• Response time
Default value is 1. Adjustment range is from 0.0001 to 7.5.
Higher gain results in:
Lower gain results in:
Adjustment procedure:
1. Start with gain factor 1.0
2. Open valve.
3. Control a typical pressure / flow situation.
4. Repeat from step 2 with lower (higher) gain factors until optimal pressure response is achieved and stability is ok.
Note: Normally adjustments down to gain factors of 0.42 should lead to good results. Otherwise you may need to
improve sensor connection. Refer to «Requirements to sensor connection».
('Control View', 'Control Performance Analyzer' or
Set gain factor in menu 'Setup / Control Parameter'
3.10.1.2 Sensor delay adjustment
Sensor delay adjustment effects:
• Stability
Default value is 0. 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.
Note: 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.
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».
('Control View', 'Control Performance Analyzer' or
Go to 'Setup / Control Parameter' menu.
Select sensor delay.
VAT Vakuumventile AG, CH-9469 Haag, Switzerland
Tel +41 81 771 61 61 Fax +41 81 771 48 30 CH@vatvalve.com www.vatvalve.com
Installation, Operating & Maintenance Instructions
Series 650 DN 100-250 (I.D. 4" - 10"), CC-Link
faster response
slower response
Local operation:
'Service Box 2')
Local operation:
'Service Box 2')
higher over- / undershoot of pressure
lower over- / undershoot of pressure
Note: It's not possible to do 'Gain factor adjustment'
Note: It's not possible to do 'Sensor delay
adjustment' via CC-Link.
Remote operation:
via CC-Link.
Remote operation:
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