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I have a servo controlled system using a Moog 504 type amplifier and Moog motor driven by a Trio Motion controller. The system is used to drive linear motion through a ballscrew/leadscrew at 0.6" pitch. When this system was installed it ran OK for three weeks and then problems began to occur again(the original ballscrew was 1.875" and showed similar problems until it was changed to 0.6").
1. The motion, which follows a smooth profile was said to be very jerky.
2. If left standing over the weekend with power on the axis will drift (not a massive movement approximately 50-100 thou).
3. It will also drift during the course of the day whilst running and has to be adjusted 10-20 thou daily.
4. It also shows signs of not being able to hold position or a lack of "stiffness". There is a load applied to the ballscrew whilst in a stationary position. When the system is running perfectly this can be apprximately 0-2 thou because of mechanical losses. It is now showing 6-10 thou which is causing problems because the position has to be held for a "pick-up" action to occcur.
The system is programmed with gains that are broad to cover a range of machines, but have worked in the past (although this machine is subtily different).
Thanks in advance for any advice or suggestions anyone can offer.
Mark Johnson
1. The motion, which follows a smooth profile was said to be very jerky.
2. If left standing over the weekend with power on the axis will drift (not a massive movement approximately 50-100 thou).
3. It will also drift during the course of the day whilst running and has to be adjusted 10-20 thou daily.
4. It also shows signs of not being able to hold position or a lack of "stiffness". There is a load applied to the ballscrew whilst in a stationary position. When the system is running perfectly this can be apprximately 0-2 thou because of mechanical losses. It is now showing 6-10 thou which is causing problems because the position has to be held for a "pick-up" action to occcur.
The system is programmed with gains that are broad to cover a range of machines, but have worked in the past (although this machine is subtily different).
Thanks in advance for any advice or suggestions anyone can offer.
Mark Johnson