AXBB hookup question

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AXBB hookup question

Postby Greolt » Sat Mar 09, 2019 10:39 pm

Can I hookup my THC in the way shown in pic?

The THC outputs a 24v signal (probably 12v in my case)

Prevously I was using Mach3 via LPT with BoB, I used some opto-couplers to get an on/off switch from that voltage signal.

Now I am installing the AXBB in the plasma CNC.

I think this will be OK but wanted to check. Do I need to add a current limiting resistor?

THC is entirely separate from the AXBB power supplies.

Shown is arcOK signal. It will also have UP and DOWN signals.

They all three share a common return on the THC. Can I daisy chain the negative connections on the AXBB?
Attachments
THC Hookup.jpg
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Re: AXBB hookup question

Postby dezsoe » Sat Mar 09, 2019 10:59 pm

Yes, it's OK. As you can see in the AXBB manual, the inputs are designed for 24V, so you don't need any resistors. The - pins can be common.
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Re: AXBB hookup question

Postby Greolt » Sat Mar 09, 2019 11:24 pm

Thank you Dezoe

No doubt I will soon have more questions. :)
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Re: AXBB hookup question

Postby Greolt » Sun Mar 10, 2019 9:25 pm

Could not find this info in the manual.

What current is the isolated input capable of sinking.

Many similar devices I have used in the past have a 20ma limit.

Assuming this can handle more than that.
Attachments
relay.jpg
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Re: AXBB hookup question

Postby Robertspark » Sun Mar 10, 2019 9:33 pm

Page 19 and 20 of the axbb manual states the inputs have 2.2k ohm resistors

Ie 24volts/2200 = 10mA approx
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Re: AXBB hookup question

Postby Greolt » Sun Mar 10, 2019 10:43 pm

Thanks for the pointer (reminder to RTFM) Rob :)

Port#1 pins 2. to 8. are isolated outputs. These outputs contain high speed 10Mbit/sec optocouplers and an N-channel Mosfet transistors.
The outputs can drive up to 500mAmps of current up to 24Volts voltage levels.
The high current capability of the output transistors makes these outputs ideal to drive relays, solid state relays and other signals which require isolation.


My relay that draws 38ma should be fine.
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Re: AXBB hookup question

Postby cncdrive » Mon Mar 11, 2019 12:19 am

Yes, there are power mosfet transistors on the outputs. We recommend switching up to 500mA current max. per output. It should be more than enough even for large relays.
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Re: AXBB hookup question

Postby Greolt » Fri Apr 05, 2019 12:21 pm

My second AXXB is about to arrive. This one is going in my router.

Most of the hookup is straight forward. Inputs are fine.

However I have five axis to control and only eight non isolated outputs on port 1.

So I am wondering should I control the fifth axis (step and direction) with two isolated outputs on port 1, or pick up two (assume non isolated) outputs on port 3.

These would be connected direct to pins on port 3. I don't have real estate for a BoB just for two extra outputs.

Drives have isolated inputs.
Last edited by Greolt on Fri Apr 05, 2019 12:25 pm, edited 1 time in total.
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Re: AXBB hookup question

Postby dezsoe » Fri Apr 05, 2019 12:25 pm

If the inputs on your motor driver are optoisolated then you can connect them to port 3.
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Re: AXBB hookup question

Postby Greolt » Fri Apr 05, 2019 12:27 pm

Thanks Dezoe

So hooking direct to pins on port 3 should not be a problem.
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