VAT 615 Series Installation, Operating, & Maintenance Instructions page 47

3. Optimizing P-Gain
While optimizing P-Gain, the gas flow determined above has to be constant all the time.
Start optimization with P-Gain set to 1.0 and I-Gain set to 0.0.
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 even does not stabilize at all, the P-Gain is too high. If there is no over shoot
and the pressure reaches SP1 asymptotically and very slow, P-Gain is too low.
The optimal P-Gain value is found if the transition from SP2 to SP1 results in a slight pressure over shoot. It does not
matter if there is still a deviation between SP1 and actual pressure.
Example:
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
Installation, Operating & Maintenance Instructions
Series 615 DN 40 (I.D. 1½"), DeviceNet
603476EA
47/102
2013-07-25