Large DC motor control

Other Hardware Motors, Mechanics, Power and CNC
15

You said you already have Minarik drive RG60U. You can convert that to the RG60U-PGM by adding the isolator card. From the manual:

"Minarik Drives offers a field installable isolation adder board, part number 200-0440, to convert a RG6xU into a RG6xU-PCM."

But, I can find zero information on the isolator. Specifically, it does not say it provides isolation for a potentiometer, it only says it provides isolation for an analog input. My concern is where does the +10 supply for the pot originate? Is that voltage isolated? Without being able to confirm that, I'm not willing to say the digital pots would work without a separate, isolated 10 volt source to feed the pots which then just output a 0 to 10 volt speed reference.

I way I see things, you have two options:

  1. Use the RG60U's as is and build/use two the isolated circuits shown in post #12.

  2. Buy two 200-0440 isolators and use two digital potentiometers and a separate, isolated +10 pot supply.

Number one is going to be significantly less costly with zero difference in performance.