Electronics for New Machine + Chinese Spindle + VFD

[Clive S]

Actually this is getting more complicated.
It looks like if you use that 24 volt input to the KK01, you need to put resistors in the output to the drivers as well.
Think your relay idea might be simpler after all.

Would proximity switches be better / simpler, and avoid the need for the relay?
It looks like they are powered separately from the signal line.

Here's a link to the manual that shows all this stuff..
http://cnc4you.co.uk/resources/KK01.pdf

Thanks
Martin

Martin The 24V line is only for the limits + estop. The driver signals are output from the BOB that will be 5V so no resistors needed.
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The Estop line to the bob is at 5V as it is isolated by the contacts of the relay (ie fed from the BOB through the relay contacts and back to the BOB) .
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If you go with sensors then you would not need the 24V SPST relay but then to be safe I would put a 1k resistor in the signal line ( usually black wire) to limit current.
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Re the 4PDT relay it can be used as normally open or closed depending which contacts you use on the relay.

[mturneruk]

Thanks Clive.

Ok. have done some more reading on using 24v for limits.
I will stick with the relay as per Jazz's diagram.
I assume using prox sensors will make no difference in accuracy terms for homing as it's the relay that is causing the inaccuracy.
I can live with that.

Thanks.
Martin