Duet2 on board driver heat

R006

Hello,

I have been using the Duet 2 WiFi board with RRF 3.5.2 for the past month and have noticed that my onboard drivers are overheating. The connector for the X motor burned out and stopped working, though it resumed functioning after I replaced the connector. I experienced a similar issue with the Z drive as well.

The RMS current of my motors is 2.5A, and I’ve set the currents as follows: X and Y at 2.0A, and Z at 2.2A. My print area is 500x500x500 mm, with a metal bed weight around 15 kg.

Any suggestions on that @dc42 @Phaedrux

dc42

@R006 are you cooling the Duet according to our recommendations at https://docs.duet3d.com/Duet3D_hardware/Duet_2_family/Duet_2_WiFi_Ethernet_Hardware_Overview#cooling ?

R006

@dc42
Yes, there is a cooling fan that blows air onto the board.

droftarts

@R006 Are you getting warning or error messages about the drivers overheating? Or is this about the connectors?

If you are getting warnings, provide more cooling to the back of the Duet board, which is where the drivers sink their heat.

If it's the connectors, ensure better contact of the motor connector to the board. The sprung part of the crimps in the motor connector may have weakened over time, and be making poor contact with the pins on the Duet header. This can cause heating, particularly when using higher currents.

Ian

R006

@droftarts
However, I am not receiving any driver warnings or errors.

dc42

@R006 if it's just one pin on a driver connector that's getting burned, the usual reason is a bad crimp connection of the stepper motor wire to the corresponding crimp pin in the plug.

R006

@dc42
About a month ago, I had the same issue with the Z driver.
so what is cause?

Phaedrux

@R006 said in Duet2 on board driver heat:

so what is cause?

the usual reason is a bad crimp connection of the stepper motor wire to the corresponding crimp pin in the plug.

R006

@Phaedrux
okay
Thank you