This weekend we upgraded our old Shopbot board to the new V4G board with a v204 controller.

In my initial testing I noticed that when I tried to jog on the X axis sometimes the gantry would torque briefly (as if one of the motors was pushing the wrong direction). To diagnose the issue I disconnected the motors from rack and observed some really chaotic behavior from the X1 motor.



Our motors are: VEXTA A6497-9412KTG

I shut everything down, disconnected the motors, examined the connectors and remade the connections. When I started things up everything ran smooth as silk.

Today, I powered on the bot and it happened again. After tinkering for a few minutes, disconnecting and reconnecting the motors everything started working again.

Has anyone else seen this? What explains the bizarre intermittent occurrence of the issue?

Many thanks!

-Z