I was forced to reduce the size of the sand table mechanism I've been powering with iHSV servomotors and was running tests after reassembling the mechanism. The machine homed OK, so i selected one of the old pattern files to run, forgetting that those patterns were for a slightly bigger table. The machine did what it was supposed to and when the carriage hit the end of one of the axes, there was a snap, a spark and the whole thing stopped dead. The death toll included the Duet 2 WiFi controller board (the source of the snap and spark), and the 200W power supply that was powering both the motor and controller board, about $180 worth of damage. Fortunately, the motors are OK.
I think that when the motor was physically forced to stop, the current spiked, probably causing the power supply to protect itself by shutting down, creating a back EMF voltage spike that was sufficient to destroy the controller and power supply.
Lesson to learn from this: don't share a power supply between a servomotor and an expensive controller board!
The new controller board is going to get its own power supply...
I think that when the motor was physically forced to stop, the current spiked, probably causing the power supply to protect itself by shutting down, creating a back EMF voltage spike that was sufficient to destroy the controller and power supply.
Lesson to learn from this: don't share a power supply between a servomotor and an expensive controller board!
The new controller board is going to get its own power supply...