My DMC 63V Z axis drops to the machanical end positon when I hit the enclosure door open switch. Due to which ballscrew bearing clamping bolts shear off or the belt which drives the ballscrew breaks. While running the program this malfunction not observed. It observed when I hit the enclosure door open switch or internal stop switch. It seems that after hitting those switches the motor fourcefully drives the Z axis to the end limit. Power cables and encoder cables are OK. Is the problem is with motor or the drive? Please suggest.
Thanks...

Atul