I came into work midnights and was asked to check a Benshaw drive for a 600v 40amp motor on a large air handeling unit.
After a few minutes it was obvious that L1 and L2 SCR'S were shorted.Since there is no bypass the only option was to wire straight off the fuse holders which I was not willing to do without written direction and was unable to get a hold of the on call supervisor.
The motor has just been change a week ago by others and the sealtight fitting is tie wrapped to the box as they obviously didn't have the requireed reducers.The box is also not tight to the motor so this all needed to be sorted for fear of a another short.
I ended up just locking and tagging it out as moving a 400lb motor in a confined space to get at the box by myself was out of the question.In the 15yrs i have worked in plants i have never seen a 40hp motor wired right off the fuse holders and wonder how often it done and for how long.Would you do it under these conditions.They didn't fix any thing
