Hi i have my electronics all hooked up and i am building a MendelMax 1.5 or 2 i'm not sure. I have the stepper motor driver connected to their position according to schematic diagram and the microsteppers jumper were installed. The scenario is this: X and Y axis works fine. Z axis couldn't move with two motors connected at the same time. Loud buzzing and whining noise is heard only. When i take off one of the Z motor, it moves smoothly. The stepper motor driver i used here is A4988 red colour driver. I have changed to DRV8825 purple colour driver to test and they could turn smoothly but the driver turns incredibly hot. The power supply i'm using is a 12V 30A power supply. Can anyone tell me what the problem is or teach me how to further troubleshoot to identify what problem it is? Thanks. https://reprap.org/forum/read.php?219,693215,693215#msg-693215 Sat, 10 Oct 2026 17:11:59 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?219,693215,693677#msg-693677 https://reprap.org/forum/read.php?219,693215,693677#msg-693677 RevoCayne RAMPS Electronics Tue, 02 Aug 2016 02:50:03 -0400 https://reprap.org/forum/read.php?219,693215,693235#msg-693235 https://reprap.org/forum/read.php?219,693215,693235#msg-693235
1. (best) Wire your stepper motors in series instead of in parallel. Google "wire stepper motors in series".

2. Use the DRV8825 driver but turn the current setting pot down. See if you can find a setting that still works but doesn't overheat the driver.

3. Use the A4988 driver but turn the current setting pot up. See if you can find a setting that works but doesn't overheat the driver.]]> dc42 RAMPS Electronics Mon, 01 Aug 2016 04:55:16 -0400 https://reprap.org/forum/read.php?219,693215,693215#msg-693215 https://reprap.org/forum/read.php?219,693215,693215#msg-693215
I have the stepper motor driver connected to their position according to schematic diagram and the microsteppers jumper were installed. The scenario is this:

X and Y axis works fine. Z axis couldn't move with two motors connected at the same time. Loud buzzing and whining noise is heard only. When i take off one of the Z motor, it moves smoothly. The stepper motor driver i used here is A4988 red colour driver. I have changed to DRV8825 purple colour driver to test and they could turn smoothly but the driver turns incredibly hot.

The power supply i'm using is a 12V 30A power supply. Can anyone tell me what the problem is or teach me how to further troubleshoot to identify what problem it is?

Thanks.]]> RevoCayne RAMPS Electronics Mon, 01 Aug 2016 03:30:44 -0400