Series 613 OPERATION
984360EC Edition 12.08.2022 109/
Optimizing I-Gain
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.
If the pressure follows the ideal pump/venting line with significant delay, the I-Gain is too low.
If the pressure oscillates around the ideal pump/venting line or if the valve position oscillates, I-Gain is
too high.
I-Gain is optimized if the pressure follows the ideal pump down line closely and the valve position is
not oscillating at all.
Example:
Optimizing I-Gain
I-Gain is responsible to reach the setpoint. If reaching setpoint is not important (e.g. setpoint is 0)
leave the I-Gain at 0. Otherwise start with P-Gain set to half of the value found when optimizing P-
Gain and set I-Gain to 0.1. Keep the P-Gain constant. Start again the pump down. Check how the
pressure reaches the setpoint:
If the setpoint is reached too slowly increase I-Gain
If there is an undershoot increase I-Gain
Required information for support:
• Go to ‘Tools / Create Diagnostic File’ in ‘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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