VAT 642 Series - Page 49

Series 642 INSTALLATION
742280ED Edition 2017-11-24 49/
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Local operation
:
(‘Control Performance Analyzer’ or ‘Service Box 2‘)
Remote operation
:
(Refer to chapter «Pressure control algorithm»
> «Adaptive control algorithm» for details)
With CPA:
• Do the ‘Ramp Time’ and ‘Ramp Mode’
adjustment in menu ‘Pressure Control’ /
‘Setup’ / ‘adaptive downstream’.
With SB2:
• Do the ‘Setpoint Ramp’ adjustment in
menu ‘Setup / Control Parameter’ (Ramp
Mode is not possible with SB2)
Send ‘RAMP TIME ‘ and ‘RAMP MODE’
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
:
(Refer to chapter «Setup command» >
«VALVE SEED» for details)
With CPA:
• Do the ‘Valve Speed in menu ‘Valve’ /
‘Setup’ / ‘valve speed’.
With SB2:
• Do the ‘Valve Speed’ adjustment in menu
‘Setup / Control Parameter’
Send ‘VALVE SEED‘