Servo Motors missing input signal & making clunking sound
Posted: Tue Apr 14, 2020 8:36 am
We have just got our Optimum milling machine setup with 750w Servos with Dyn4 Servo amplifiers.
We bench tested the acorn and all seemed to be good
We then connected the Servo Drives one by one and tested the communication between the servo drive and the servo motors. All drives and motors tested ok.
We completed the auto tuning for each servo drive and the motors were quiet and the motion of the servo was smooth in both directions.
We tested the motion sending pulse signals using the DMMDRV software with pleasing results where the motion of the servo was quiet and smooth as per the tuning.
We then connected the drives up to the Acorn Controller and jogged each axis. We then homed the machine which was OK. We then attempted to carry out the fine tuning of each axis following the fine tuning procedure as per the Centroid Fine Tuning Procedure . The first movement was smooth and came out to be approx. 0.07 mm off the required dimension. We then updated the mm/rev for the X axis. On returning the axis back to the starting position. The servo started to make a clunking sound with intermittent movement and on returning to the datum the readout value was incorrect by a significant amount. We then found that the dial indicator did not show movement when jogged in +1 mode but showed increment on the screen. On watching the coupling, the motor appeared to be getting the signal but didn’t move. We then proceeded to re-tune the servos thinking that it might have been the servo parameters that might have been not optimum but this did not seem to fix the problem. We then auto tuned the settings again and tested finding the problem was still there.
Tonight, we isolated each axis and tested them one by one. All axes seemed to be quiet and moving smoothly. We turned the machine off and turned all drives on and proceeded to home the machine. The machines motion seemed smooth and it seemed that the drives were moving as instructed. We thought we would try and run the fine-tuning procedure again. On setup of the gauge blocks the machine was then jogged to zero off at the end of the gauge blocks. The datum edge was zeroed and the dial indicator was then jogged towards the other end of the gauge block stack. On doing this the servos started making a clunking sound again and on checking the indicator the table didn’t move as the table was jogged.
Please find images and video of the machine, cabinet internals and screen shots of settings https://photos.app.goo.gl/75Qh8fWJMZAwQHif6
Please advise what steps We should take to eliminate these issues.
Thank you
Regards
Mark & Mac
We bench tested the acorn and all seemed to be good
We then connected the Servo Drives one by one and tested the communication between the servo drive and the servo motors. All drives and motors tested ok.
We completed the auto tuning for each servo drive and the motors were quiet and the motion of the servo was smooth in both directions.
We tested the motion sending pulse signals using the DMMDRV software with pleasing results where the motion of the servo was quiet and smooth as per the tuning.
We then connected the drives up to the Acorn Controller and jogged each axis. We then homed the machine which was OK. We then attempted to carry out the fine tuning of each axis following the fine tuning procedure as per the Centroid Fine Tuning Procedure . The first movement was smooth and came out to be approx. 0.07 mm off the required dimension. We then updated the mm/rev for the X axis. On returning the axis back to the starting position. The servo started to make a clunking sound with intermittent movement and on returning to the datum the readout value was incorrect by a significant amount. We then found that the dial indicator did not show movement when jogged in +1 mode but showed increment on the screen. On watching the coupling, the motor appeared to be getting the signal but didn’t move. We then proceeded to re-tune the servos thinking that it might have been the servo parameters that might have been not optimum but this did not seem to fix the problem. We then auto tuned the settings again and tested finding the problem was still there.
Tonight, we isolated each axis and tested them one by one. All axes seemed to be quiet and moving smoothly. We turned the machine off and turned all drives on and proceeded to home the machine. The machines motion seemed smooth and it seemed that the drives were moving as instructed. We thought we would try and run the fine-tuning procedure again. On setup of the gauge blocks the machine was then jogged to zero off at the end of the gauge blocks. The datum edge was zeroed and the dial indicator was then jogged towards the other end of the gauge block stack. On doing this the servos started making a clunking sound again and on checking the indicator the table didn’t move as the table was jogged.
Please find images and video of the machine, cabinet internals and screen shots of settings https://photos.app.goo.gl/75Qh8fWJMZAwQHif6
Please advise what steps We should take to eliminate these issues.
Thank you
Regards
Mark & Mac