This is a very interesting thread to have just read as we are experiencing very similar problems with a famous manufacturer of camera stacks.
On this particular stack it has a new flat screen monitor and the usual items of equipment that the surgeons always complain about. In our hospital this stack is being moved from one theatre to another and is the common link in causing the 32A current trip to trip! It seems to happen predominatley first thing in the morning, but has been known to fail at other times. The stack has a isolating transformer with an in-rush PCB and when we have tested the stack it only pulls 2.5Amps on swith on when the fault occurs. Our test kit is not good enough to see the raising edge of the current spike we think is the problem at switch on. What we are attempting to do is by-pass the manufacurers isolation on the base of the stack and introduce our own RS isolation trans while we await the manufacturer to fix this fault.
Is the problem caused when the system is cold first thing in the morning and the isolation trans acts like a short cicuit, hence the current spike or is it the in-rush PCB?
Double D.
