VAT 642 Series Installation, Operating, & Maintenance Instructions page 50

4.7.1.1 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.
Local operation:
('Control View', 'Control Performance Analyzer'
or 'Service Box 2')
Set gain factor in menu 'Setup / Control
Parameter'
50/94
INSTALLATION
faster response
slower response
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».
Edition 2017-11-24
higher over- / undershoot of pressure
lower over- / undershoot of pressure
Remote operation:
It's not possible to do 'Gain factor adjustment' via
remote operation.
Series 642
605403ED