Retrofit utilizing existing power supply for Mesa Field Power

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03 Aug 2020 01:28 #176981 by riversvic
I’m working on a ~1978 Wells Index 700 CNC utilizing the original stepper motors. I was going to use the existing power supply for stepper power 45vdc. The original supply also has a very steady 24v output from a regulator board. Would it be safe to use the old power and regulator board for field power in to my 7i76? If so do I need any additional protection?

How do I supply field power when the ramp up rate must be less then 10v/millisecond Without switch or relay? The 24v is active once the power toggle switch is turned On.

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03 Aug 2020 03:59 #176996 by PCW
That should be fine for field power, as long as the DC side is not switched
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03 Aug 2020 04:10 #176997 by riversvic
thank you, so I should bypass the toggle so DC is always hot when AC In is activated?

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03 Aug 2020 04:44 #177002 by PCW
Yes if the switch is on the DC side, if its on the AC side, its fine.
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