If you have a clamp on ammeter, prefereably AC/DC like the attachment type, work through the distribution and take readings at different points to pin-point the source of high currrent, for e.g. , take a reading on the 3ph input to the drive etc. It has to be a circuit that normally takes high current otherwise a fuse would have blown, control etc.
If it shows that the SP drive is reading high, disconnect the SP motor and test again.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.