Suggestions on torch start/stop wiring

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Suggestions on torch start/stop wiring

Postby The-Meerkat » Sun May 10, 2020 6:04 pm

I’m about to wire the torch start/stop from a Powermax 65 to a UCBB Dual Port Breakout Board. From my Powermax manual it looks like connector sockets 3 & 4 in the machine interface Cable (blue, black wires) are what I’m connecting to on the plasma cutter side. Any suggestions on the best way to connect to the breakout board?
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Re: Suggestions on torch start/stop wiring

Postby Robertspark » Sun May 10, 2020 7:17 pm

Image

You need a relay as it is supposed to be a dry contact closure. It is recommended to use a high speed relay (one that opens and closes quickly and consistently.... Such as a Reed relay or something else in the order of low milliseconds to open and close)

The relay would then have it's coil wired to one of the outputs pins of the ucbb
Rob
Einstein ― “If you can't explain it to a six year old, you don't understand it yourself”
...working my way through the 1000+ ways things don't work to find the one that does
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Re: Suggestions on torch start/stop wiring

Postby Robertspark » Sun May 10, 2020 7:30 pm

Rob
Einstein ― “If you can't explain it to a six year old, you don't understand it yourself”
...working my way through the 1000+ ways things don't work to find the one that does
UC400eth, UC300eth, UCCNC v1.2110, Neuron Lite
UCCNC v1.2110 Macro Manual
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Re: Suggestions on torch start/stop wiring

Postby The-Meerkat » Mon May 11, 2020 4:07 am

Hi Robert,

When taking apart my old plasma table electronics to upgrade to the new UCCNC equipment I pulled the relay in the attached photo and a power supply from it. I failed to document how I disassembled it. I thought I had a couple pictures, but I don’t now.

I’ve got the green & black wires from connector sockets 3 & 4 of the interface cable identified.
I’ve got the power supply with a (+) wire and (-) wire.
I’ve got a relay with 4 terminals, each marked with numbers.
I’ve got several open output pins on my breakout board.

On the relay I’m thinking the terminal marked 30 goes to (+) power supply and terminal 85 goes to (-) power supply. I could be wrong. I’m clueless on how to wire the others.
Attachments
4C0C3FD0-01AD-4C38-B510-92D887A2EC89.jpeg
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Re: Suggestions on torch start/stop wiring

Postby Robertspark » Mon May 11, 2020 7:28 am

That is a bit of a clunky automotive relay ... It will work but it will be slow to open and also the coil collapsing will generate a reverse voltage so you WILL need a diode in parallel with the coil to prevent killing the output from the ucbb

Image

Those relays are designed for high current applications
I don't know if I believe this datasheet saying 2msec release time
https://www.mantech.co.za/datasheets/pr ... 85-97M.pdf

Get a IN4007 (very cheap and common diode).... Any IN400x (X= 1 to 7 ) will do just fine

Any one of these type of relay PCBs would be a better choice
https://www.ebay.co.uk/itm/162988378827
srd-12vdc-sl-c relay 5 mSec release time
https://www.google.com/url?sa=t&source= ... 9181214847



I have some of these too which are better (quicker and more consistent switching times) but they are more expensive
https://images.app.goo.gl/Zoed9GcjhBEbv9Vh7
RY12W-K relay 3mSec release time

https://www.google.com/url?sa=t&source= ... oh2T-qTIpE
Rob
Einstein ― “If you can't explain it to a six year old, you don't understand it yourself”
...working my way through the 1000+ ways things don't work to find the one that does
UC400eth, UC300eth, UCCNC v1.2110, Neuron Lite
UCCNC v1.2110 Macro Manual
Robertspark
 
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Joined: Sat Sep 03, 2016 4:27 pm
Location: Nr Liverpool, England

Re: Suggestions on torch start/stop wiring

Postby Robertspark » Mon May 11, 2020 7:29 am

The-Meerkat wrote:.

On the relay I’m thinking the terminal marked 30 goes to (+) power supply and terminal 85 goes to (-) power supply. I could be wrong. I’m clueless on how to wire the others.


Yes that is correct.... But don't forget the diode to remove the spike generated by the collapsing voltage through the coil when it turns off
Rob
Einstein ― “If you can't explain it to a six year old, you don't understand it yourself”
...working my way through the 1000+ ways things don't work to find the one that does
UC400eth, UC300eth, UCCNC v1.2110, Neuron Lite
UCCNC v1.2110 Macro Manual
Robertspark
 
Posts: 1667
Joined: Sat Sep 03, 2016 4:27 pm
Location: Nr Liverpool, England

Re: Suggestions on torch start/stop wiring

Postby The-Meerkat » Mon May 11, 2020 8:49 am

Thanks for the help Robert. That car relay was the original stuff. What you’re saying makes sense. I just ordered the RY12W-K relay 3mSec release time relay you recommend. It’ll take a week to arrive. In the meantime I read up on this new one.

All the best,

Scott Meer
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