Installation, Operating & Maintenance Instructions
Series 615 DN 40 (I.D. 1½”), DeviceNet
VAT Vakuumventile AG, CH-9469 Haag, Switzerland
Tel +41 81 771 61 61 Fax +41 81 771 48 30 CH@vatvalve.com www.vatvalve.com
4. Optimizing I-Gain
While optimizing I-Gain, the gas flow determined above has to be constant all the time.
Start with P-Gain set to half of the value found when optimizing P-Gain and set I-Gain to 1.0.
Keep the P-Gain constant.
Set chamber pressure to SP2, wait until the pressure is stable. Set pressure to SP1. If the transition from SP2 to SP1
results in a significant pressure over shoot or if the valve position does not stabilize, I-Gain is to high. If the transition results
in a slow asymptotical pressure rise and there is still a constant deviation to SP2, the I-Gain is too low.
The optimal value for I-Gain is found if the transition from SP2 to SP1 result in just a slight pressure over shoot, a stable
valve position and the actual pressure matches SP2 exactly.
Example:
Note: Check control performance over the whole control range with parameters above.
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