Guess what...its gone and done it again I don't understand what is causing it! I had the 27ohm resistor directly on the charge pump output then through two e-stop switches and onto to 24v- on the relay. The relay 24+ goes direct to the 24v output from the PSU . I also have the diode across the coil of the relay

It is behaving slightly different this time though in that the relay doesn't switch on until the charge pump is active. The problem comes when the reset or estop is tripped. The charge pump led switches off but the relay stays active ( the relay led stays lit but dimly when the charge pump output should be inactive?)
I thought It was going too well I had done a couple of trial parts and was working on reducing backlash and and alignment when I noticed the estop didn't cut the power, I am wondering if it's the actual relay causing it

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