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22-09-2020 #11
Perfectly viable.
Although anything that bypasses the switches (e.g. my first post) takes the manual switches out of the equation. I'd look at the installation effort.
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22-09-2020 #12
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22-09-2020 #13
Cautionary note - I can't recall previous conversations and the details of the relay and whether it has an integral diode - just remember to add a diode if not part of the relay to protect the AXBB against back-emf - pretty sure it's covered in the AXBB documentation.
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22-09-2020 #14
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22-09-2020 #15
Hmmm, you're right - it instead refers to a relay coil with a +/- nomenclature on the coil - okay if the relay integrates a back-emf diode - I've seen relays with these - but never experienced them myself. Worth being vigilant on that topic - otherwise you can risk damage to the AXBB. Or drive the relay through a transistor amplifier (I'd always belt-and-brace that solution - but that's just me) - either way the solution requires a back-emf diode to protect the switching device.
The MK2P-S does not integrate a diode - you need to add one. Psst, if you don't have one PM me your address and I'll pop a couple in the post - I'm heading to the PO this afternoon anyway.
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22-09-2020 #16
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24-09-2020 #17
Thanks for all the help folks - M8 now turns my compressor on and off - next step find a cheap solenoid valve to allow air to the cutter.
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24-09-2020 #18
Gah, if only you'd said about the valve earlier!
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24-09-2020 #19
It was actually an after thought to make it 100% automatic, if you have a 24V Normally Closed valve knocking around would you swap it for a Normally Open one? No problem if not as I will just wire it up so the NO valve closes when the compressor is powered on with the manual switches.
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24-09-2020 #20
Ah!, 240VAC coil N/C (powered to open) - from memory.
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