Series 642 INSTALLATION
813316EB Edition 2017-11-24 53/
4.7.1.4 Valve speed adjustment
Valve speed effects: Response time
Default value is 1000. Adjustment range is from 1 to 1000.
This parameter effects valve plate actuating speed.
Speed adjustment is effective for PRESSURE CONTROL and POSITION CONTROL.
Normally best pressure control response is achieved with max. valve speed. In
particular applications it may be of advantage to have a slower valve response.
OPEN and CLOSE are always done with maximum speed.
Adjustment procedure:
1. Use optimal gain factor, sensor delay time and setpoint ramp according to preceding tuning steps.
2. Open valve.
3. Control a typical pressure / flow situation.
4. Repeat from step 2 with slower valve speed until required response is achieved.
Local operation:
(‘Control Performance Analyzer’ or ‘Service Box 2‘)
Remote operation:
With CPA:
• Do the ‘Valve Speed in menu ‘Valve’ /
‘Setup’ / ‘valve speed’.
With SB2:
• Do the ‘Valve Speed’ adjustment in menu
‘Setup / Control Parameter’
It’s not possible via «Remote
operation»
Required information for support:
• Go to ‘Tools / Create Diagnostic File’ in ‘Control View’ resp. ‘Control Performance Analyzer’ and save
file
• Pressure / flow / gas conditions to be controlled
• Chamber volume
• Pumping speed (l/s) and pump type (e.g. turbo pump)
• System description
• Problem description
Send diagnostic file with and all required information to tuning-support@vat.ch
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