The motors you are using are slightly over the edge of the power handling capacity of the board. The driver chips are rated at 2.5 amps per phase maximum – the motors you are using are 2.8 amps per phase. These might work, but you will have to pay attention to cooling. Use a fan.
You can try using the 2.8 amp Kelings, as long as you have them. If the motors are too much for the drivers to handle the drivers will go into thermal shutdown and the motors will stutter or shut off. So far I have not managed to kill the drivers with overly large motors (and I’ve tried); but no gurantees. I’m running a Probotix Fireball with some 4 amp / phase motors. The chips run hot, but they do run. The caveat is that I have not done any really heavy cutting to properly load the things yet.
The board is rated to 30v because the capacitors are 35v caps. If you run them at 36v you run the risk of blowing the caps. I usually run at 24v, or dial down a 36v or 48v adjustable supply to 30v. The amperage needs to be sufficient for your moves – worst case 6x what a winding takes, but in reality it’s somewhat less than that as it’s unusual to get all 3 motors running at full cutting load.
Alden
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