This is why you should be extra careful when using cheap Chinese external stepper drivers.
This resulted in very strange behavior. This driver is connected to 3 stepper motors (in parallel ) for my Z axis, and suddenly one motor stopped working, and the other two went in the wrong direction, tilting the bed,until everything jammed.
Vendor?
Second image, is that wire came off on its own or you remove it afterward?
@Shachar_Gafni It’s a HY-DIV268N-5A from aliexpress
@Dont_Miyashita The wire came off after. All the screws of this connector had come loose. Probably from the heat.
Dunno, looks to me like you overloaded the connectors. How much current are you pushing? Did you de-rate the connector for ambient temp and number of adjacent ways carrying current?
@Ryan_Carlyle It’s pushing 3.3 Amps.
The power supply is 24 V.
Ambient temp is around 20 degrees celsius.
My guess is that due to the bad solder joints the connector started to heat up, and over time these kind of screw connectors don’t react well to the difference in temperature, and the wires come loose a little, start to make bad contact, and the whole cycle speeds up, to the point it fails. I’ve seen this happen on a much larger scale, where a big relais placed below a frequency regulator caused the cable clamping terminals to do the same trick.
The frequency regulator lost it’s will to live.
@Rien_Stouten Only 3.3A shared by three steppers? In that case, yeah, probably progressive heating/loosening like you mention.