INSTALLATION
Series 642
50/107
Edition 2017-11-24
813316EB
4.7.1.1
Gain factor adjustment
The gain factor effects: Stability, Response time
Adjustment range is from 0.0001 to 7.5.
- Higher gain results in: faster response / higher over- / undershoot of pressure
- Lower gain results in: slower response/ lower over- / undershoot of pressure
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.
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».
Local operation:
(‘Control Performance Analyzer’ or ‘Service Box 2‘)
Remote operation:
With CPA:
•
Do the ‘Gain Factor’ adjustment in menu
‘Pressure Control’ / ‘Setup’ / ‘adaptive
downstream’.
With SB2:
•
Do the ‘Gain Factor’ adjustment in menu
‘Setup / Control Parameter’
It’s not possible via «Remote
operation»
