Retrofitting a 1986 Maho MH400E

   Hi,
I have done a similar retrofit. My machine is a Polish AVIA FND 32. Very similar to MAHO. Analog DC servos with tacho. Servo in velocity control mode with analog +/-10V input. Feedback connected via MESA to LinuxCNC. Position loop closed in LinuxCNC.

I think that if you have "axis following error", there will be a problem with the Indramat driver.
1. If I understand well, this error is triggered when the axis doesn't react properly to the LinuxCNC command. So check analog voltages from mesa to the drives. An oscilloscope would be useful in this case.
2. If signals are good, I think that the problem is with the drivers. It can be partially fried.
In my machine, I had two problems with drives. One was seized bearing in the motor. The driver wasn't able to follow the speed command.
The second time was a damaged signal transformer in thyrystor driver. Axis was slowly moving in one direction. This was a crazy failure, but I am an electronic eng., so I fixed it.
I suggest you to remove cover from Indramat driver and inspect it visually. Maybe some components are overhited and broken. You can try to publish photos here. Problems with two axis suggest that there is a problem with circuit common to whole driver. Check +/-15V power supply.

After all you can buy used drive on eBay. It is not super expensive.

I would like to help you, but I live too far away. Good luck.

   Hi,
I have done a similar retrofit. My machine is a Polish AVIA FND 32. Very similar to MAHO. Analog DC servos with tacho. Servo in velocity control mode with analog +/-10V input. Feedback connected via MESA to LinuxCNC. Position loop closed in LinuxCNC.

I think that if you have "axis following error", there will be a problem with the Indramat driver.
1. If I understand well, this error is triggered when the axis doesn't react properly to the LinuxCNC command. So check analog voltages from mesa to the drives. An oscilloscope would be useful in this case.
2. If signals are good, I think that the problem is with the drivers. It can be partially fried.
In my machine, I had two problems with drives. One was seized bearing in the motor. The driver wasn't able to follow the speed command.
The second time was a damaged signal transformer in thyrystor driver. Axis was slowly moving in one direction. This was a crazy failure, but I am an electronic eng., so I fixed it.
I suggest you to remove the cover from Indramat driver and inspect it visually. Maybe some components are overhited and broken. You can try to publish photos here. Problems with two axes suggest that there is a problem with the circuit common to the whole driver. Check +/-15V power supply.

I would like to help you, but I live too far away.