Replacing Advanced Motion Controls "brush type 12A8 with "Axcent" amplifier

Pin 4&5 are your drive signal, you are referencing them to ground , so you are in no way commanding the motor to move. Pot 4 is for offset, it can increase or decrease gain. You power the amp up and adjust the pot so the shaft is locked and has zero movement. Make sure you set the current limit gain scaling correct for you motor, there are dip switches that scale from 100 to 50% full current and a pot that can adjust the current gain lower still. AMC is correct in telling you the tuning is done at the controller, the current loop can be scaled, but it is a MAJOR pia, you will need a scope. You should also have a reference gain pot, which can decrease the gain of the input signal.

To use velocity mode, you will need some sort of feedback. Older Amc drives would run in velocity mode using back emf, Im not sure you have this option.

Truthfully, you would be better off looking for an amp that uses tach feedback, lots of 30a8's on ebay. Again you could but (they are like $15 each )a couple encoder y boards and use encoder velocity.

JR1050, Many thanks for you thoughts, please point me in the correct direction!! This is the motor tag, I have search many times and could not find any information like the " current limit gain scaling that is correct for the motor" or any technical data. I believe they are re branded product.

The motors have encoders built on them, going back to power supply box, so high power and encoder control cable, is this what is required for Encoder Velocity Mode? The 12a8 were set up in current mode I think. If I need to do more reading please point me in the correct direction, I offer my many thanks for all who make this forum possible. The original equipment was a Prototrak Plus, currently same motors and power supply.

Edit:I am using a Mesa 7i77 & 5i25 cards with Prototrak Plus motors and power supply. Brush Type

The file size to large will try again later.

Look at the original dip switch settings on the drive and compare them to the settings in the manual. Do these motors have tachs? The motors would not list a scale of any kind. Email magnatek and ask for product data for that part number. If they have tachs , they were in tach velocity mode, they could be set up for either back emf or current mode. They look like the outside of the motor is chrome plated, if so , they are probably Electrocraft.

JR1050, thanks for your help! The tag on the motors are to "look" chrome, 1 of them unless you hold just right the writing is not visible, just shinny. The motors are painted black, I will spend what ever to track down the Magnetek data, specifically "motor current ratings". Thanks

So far the only information that I have received is the link below, still waiting from www.regalbeloit.com , the actual motor manufacture.

This is a generic "Motor Current Rating Chart" at this link:
www.magtrolsf.com/media/wysiwyg/tools-fo...lts-fla_chart_v1.pdf
This shows a 1/3HP; 90 VDC is 5.2 full load amp, can I work with this?

Many thanks
Edit: The motor spec sheet for EN444-01 MOTOR is attached. As per motor data: 60VDC; .33HP; & 6.25 AMP

I warmly welcome help with the next steps with this project. Many, many, thanks, to JR1050 & tommylight for your help!!

This is "set up" for Current Mode operation:

SW1 (1, 2 & 4 = OFF) (3, 5 & 6 = ON)

POT #1 full CCW (is for Current Mode operation)

POT #2 For a 6amp limit with your drive the math would look like this
[(6Amp)/(7.5Amp)]*12 + 1 = 10.6 turns from fully CCW (This is as per the 6.25 amp; 60 VDC; referenced in the motor EN444-01 specifications in prior post)

This is as far as I have worked through, with AMC tech in the loop. Currently working to get halscope set up.

many thanks!