Retrofitting knee mill

28 May 2019 14:02 - 28 May 2019 14:03 #135166 by bevins
Replied by bevins on topic Retrofitting knee mill

austin136 wrote: Wiring is kinda a mess right now but it doesn’t even look like the relays are hooked up right now. Looks like previous owner bypassed them.
I’m assuming that sinking would be standard right?

If you get a 7i77, then you connect field power com to the relay and the output goes to the other side of the relay with a diode across the coil of the relay in reverse bias.The cathode of the diode on the positive side.

I think the 7i77D has common + voltage and the output is the field power gnd. still need the reversed bias diode.

I have always used 7i77. Alot of drives use gnd for trigger input so I just use relays on the outputs of the 7i77 and pass gnd through them to trigger the drive inputs.
Last edit: 28 May 2019 14:03 by bevins.

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