lonewolf454
Member
I have a preexisting condition on a servovalve controlled cylinder when it is at endpoint it will oscillate. We have Temposonic (blue) probe in cylinder and 1771 QB module. I have renulled valve and also checked for loose connections. PID gains appear not to be set too high P 0.4, I 0.5, D lowered it from 0.5 to 0.1 and also added deadband of 1" - and it appears to have helped, but still when machine is first started it oscillates for first 30 minutes. I can probably change servo as we have in past and problem will go away - temporarily. Something is causing this problem but I am unsure what else I need to check. There are 3 other servovalve controlled cylinders on same system and they are ok, one is on same QB module. Any suggestions?