Hello, first time I'm trying to use external drivers with a grbl (MKS DLC32 Max) controller and I'm having no luck. Can't seem to get any torque to the motors. I'm using a 15 amp 24vdc PS that powers the controller and the X axis, and 3 5amp 24v for the other axes. controller to driver: S -- PUL+ D -- DIR+ E -- EN+ G -- to all 3 grounds for the above. All wiring seems to check out, measuring .9 ohms across each coil in all motors. Measured at the controller end. I have 18awg shielded for the motors. Using DM542T drivers all set to 5v. The Z axis is the only one working well. The others don't have enough torque to move the gantry or X axis and no holding torque at all even with $1 set to 255. What am I missing? Find it hard to believe all the drivers are bad so it must be something I did wrong.
Why not just use the one 15amp. Have you tried that? Also, have you contacted Makerbase Customer Service? They may be able to help. It may be a known issue.
I have tried only the 15 amp first. Didn't work so my first thought was it wasn't providing enough power (4amps to each motor plus the controller) so I added the other PS's. No change. The drivers I'm using are active low for enabled so the second post probably doesn't apply. I ordered different drivers to try and waiting for delivery.
A "4 amp" motor is 4A at some voltage - let use our motors for more familiar math Our High Torque motors are 3A at 3V (based on their coil resistance rating, current rating and ohms law to calc voltage). 3A * 3V = 9W * 2 coils = 18w per motor. Even if you Factor in an extra 50% for driver losses (18w * 150% = 27w per motor). 27w x 4 motors = 108W PSU will suffice 24v * 15A = 360w - 3x as much as our motors would have needed Repeat math for your motors
Can't say the drivers were "bad" but they definitely didn't work in my situation. Replaced then with DM556's and once I powered them on it just worked. Didn't need to modify anything. Hopefully this helps someone in the future.
