Installation, Operating & Maintenance Instructions
Series 650, DN 100 – 250 (I.D. 4" - 10")
VAT Vakuumventile AG, CH-9469 Haag, Switzerland
Tel ++41 81 771 61 61 Fax ++41 81 771 48 30 Email reception@vat.ch www.vatvalve.com
258550EE
2007-05-11
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3.10.2.3 Setpoint ramp adjustment
Setpoint ramp effects:
• Undershoot of pressure
• Response time
Default value is 1.0 s. Adjustment range is from 0 to 10 s.
This parameter defines the time that is used to decrease / raise pressure between 2 setpoints. Especially in pressure
decrease situations at low flows pressure response can be improved much by adapting setpoint ramp time.
Adjustment procedure:
1. Start with optimal gain factor and sensor delay time according to preceding tuning steps.
2. Control a typical pressure / flow situation.
3. Control a lower
pressure.
4. Repeat from step 2 with longer setpoint ramps until best response is achieved.
5. Verify pressure control response for a setpoint raise situation.
Local operation:
(‘Control View’ resp. ‘Control Performance Analyzer’)
Remote operation:
Go to ‘Setup / Controller’ menu.
Select setpoint ramp.
Note: It’s not possible to do setpoint ramp adjustment
via remote operation.
original
setpoint ramp
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