[QUOTE=matth;1569526]How does my earth point get a "zap" at power on? It's not the neutral bar. That would mean I had massive leakage current via the CPC and the RCD I have on this circuit would trip, which it never has.
I have removed all low voltage earth returns from my main earth bond point and installed a earth busbar (separate from all 5v earths).
However this is not common practice, please lookup earth bonding where the recommendations are to bring all system earths back to a central point, which is how my system was wired. Even with a DMM bob in place this would be no different, how do DMM protect against this?
Please show me the specifications from DMM as to how my enable lines should be wired? What is the problem with tying them to ground until activation?
What am I switching after the PSU's, the wiring goes from the PSU, into a busbar them through a Breaker then into a filtering cap then into the drives. At no point is it switched!
That is a Drive Fault, If you had it wired correctly with the Alarm in place, it would not of been able to be moved
You are not getting it, what kind of relay are you using to activate the enable to the Drive, this by it's self could Zap the drives does the relay have a snubber built in/or used, to stop spikes, wiring how you have for this is incorrect
You will continue to have problems as long as you have it wire the way you have,
I posted that you should be switching the power to the power supplies, for your on off of the Drives, you should not be switching the Drive Enable the way you are
The best way for you to fix this problem is to install the Dmm Breakout Board as it should be
Your wiring is all related to the problems you are having with there system, many 1,000's of Drives are in service, with no problems
They play nice with the customer, They would not of known it was a software problem, so said something that was incorrect, they replaced your Drives, the new Drives worked correct, just as the first set of Drives had, until something happened, & now you have the same problem, give it some time & the other Drives will have the same problem too, unless you correct your wiring before this happens, the other Drives will suffer as well