Proto Trak MX3 Retrofit - Which Boards Mesa?

Have you had any success with the Mesa boards techrat?

I have an older version of the servo drives but they have the same pinout, and the driver board of the M3 pendant stopped working so I'm looking for alternatives.

Hi There JR,

I have not taken the plunge into purchasing the Mesa Boards yet. From my research it does appear to be the way to go. I just need to dive in and get it done. I know it has been a while since your post. Have you taken any steps to get your machine up and running under alternative control? I will remember to come back and post my results once I dive into this project.

Jeff

No, I have not yet purchased any boards.
I am waiting on a response from Mesa regarding a few questions I have, as I would like to use an ethernet based board instead of a PCI or parallel port based board.

Thanks for putting up the signals for the servo board by the way. The only thing SWI could tell me is that they used a 2.5VDC PWM signal.

If the drives take differential PWM, the standard differential drivers on a 7I85S should work OK
these will give between 3-4 V differential into a 100 Ohm termination

I measure 220 Ohms between the PWM and NPWM pins on my servo drive, will that be a problem?

Hello, I´m drawing the servo motor & amplifier schematics, on the servo amplifier pin #13 is 5V, #14 is Limit Switch and it go to ground at the end of 14pin round conector (once connected to external box between CPU and ServodriveMotor Assy), pin #15 is 0V (GRD) or 5V return, pin #16 is PWM, pin #17 is NPWM and pin #17 is shield and chassis earth/ground.

I would like if you repeat the test with scope of PWM using pin #15 as ground, Ch1 on PWM and Ch2 on NPWM.

5 Vdc supply comes from Motherboard´s servoboard on console and generally it returns (0V) is connected to chassis earth/ground, it is connected to the servo motor encoder (HEDS-9000 Avago) and 2 optocouplers in servo amplifier main pcboard.

Limit switch activates an optocoupler 6N139 (single LED input Darlington output) and PWM /NPWM activates HCPL2232 (2 LED input each outs to AND gate).

I have Mesa board and I´m trying to connect this drive to upgrade the proprietary 486 motherboard´s console.