Newbie converting a PM-728VT

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martyscncgarage
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Re: Newbie converting a PM-728VT

Post by martyscncgarage »

Enclosure size can be determined by laying out all your components on the bench. As for connectors and such, that depends on what you are connecting up. Your question on what to use is pretty broad and application specific.
Look at pictures and videos of others CNC control cabinets for ideas. Go check out the Centroid success stories forums, maybe there are some ideas there
Marty
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
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DesertRider
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Re: Newbie converting a PM-728VT

Post by DesertRider »

martyscncgarage wrote: Wed Dec 23, 2020 9:00 am You should only use the Acorn power supply to power Acorn and maybe drive logic.
You need a motor power supply to drive the Clearpath motors.
I have not wired up the system yet, as I am still waiting for the ClearPath system. I will use their (Teknic's) power supply, and will use the Centroid PS to power the Acorn board.

That said, Marty can you tell me what relay block are you using your control box shown in the YT video Emco PC5 Centroid CNC Acorn Conversion: Part 7 Cabinet done. Overview?
Screenshot 2020-12-27 164935.png
martyscncgarage
Posts: 7138
Joined: Tue Mar 28, 2017 12:01 pm
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Re: Newbie converting a PM-728VT

Post by martyscncgarage »

You mean Estop contactor?
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DesertRider
Posts: 17
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Re: Newbie converting a PM-728VT

Post by DesertRider »

Yeah, the item you are pointing at in the screen shot above with your index finger. Do you have a link from where I can get it?
martyscncgarage
Posts: 7138
Joined: Tue Mar 28, 2017 12:01 pm
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Re: Newbie converting a PM-728VT

Post by martyscncgarage »

What motor voltage are you using and AC or DC. That build was a 24vdc 10A axis motor power supply.
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
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DesertRider
Posts: 17
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Re: Newbie converting a PM-728VT

Post by DesertRider »

I am using the ClearPath SDSK series with their IPC-5 at 75 volts.
martyscncgarage
Posts: 7138
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Re: Newbie converting a PM-728VT

Post by martyscncgarage »

What kind of current?
Point being is you have to match the contactor to the type of voltage and the load.
You have to make sure the contactor is rated for DC voltage and the current running through it. If you get a 3 pole contactor you can run the DC positive and DC negative through it across two contacts spreading the load. The third pole can be used to break the VFD common as shown in the Acorn system schematic.
Marty
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
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martyscncgarage
Posts: 7138
Joined: Tue Mar 28, 2017 12:01 pm
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Location: Mesa, AZ

Re: Newbie converting a PM-728VT

Post by martyscncgarage »

Look for a new MOELLER EATON DILM32-01 on eBay.
It uses a 24vdc coil and should be more than enough.
You should use separate power supply for it. The logic power supply included with Acorn is only large enough for Acorn and perhaps some logic circuitry.

Always use snubbers across relay coils.

Marty
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
Mesa, AZ
DesertRider
Posts: 17
Joined: Mon Nov 30, 2020 6:49 pm
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MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
CNC Control System Serial Number: 1116203993
Location: Phoenix, Az

Re: Newbie converting a PM-728VT

Post by DesertRider »

martyscncgarage wrote: Sun Dec 27, 2020 11:02 pm You should use separate power supply for it. The logic power supply included with Acorn is only large enough for Acorn and perhaps some logiccircuitry.
Thanks Marty, that answers my original question.
martyscncgarage wrote: Sun Dec 27, 2020 10:45 pm What kind of current?
Point being is you have to match the contactor to the type of voltage and the load.
You have to make sure the contactor is rated for DC voltage and the current running through it. If you get a 3 pole contactor you can run the DC positive and DC negative through it across two contacts spreading the load. The third pole can be used to break the VFD common as shown in the Acorn system schematic.
Marty
The NEMA34 on the z axis is 273W, and will draw 3 A and 75V, while the two NEMA23 on x and y will be 173W, drawing 2.3 A each, also at 75V. The spindle is 1HP so on 120 V should draw about 6-7 Amps.

So when the e-Stop is activated, I send the signal to the Acorn from one side of the e-Stop and to the contactor from teh other side of the e-Stop. Will the contactor turn off the spindle only or should I also stop the x-, y-, and z- axis motors?

What is a snubber across the relay poles (Sorry for ignorance)?
martyscncgarage
Posts: 7138
Joined: Tue Mar 28, 2017 12:01 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: Yes
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MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: Yes
CPU10 or CPU7: Yes
CNC Control System Serial Number: none
Location: Mesa, AZ

Re: Newbie converting a PM-728VT

Post by martyscncgarage »

Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
Mesa, AZ
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