Controller hardware suggestions for first DIY build

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24 Sep 2020 22:37 #183638 by txtrone
Thanks for the input! I am at the point I have to just go for it.

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24 Sep 2020 22:39 #183639 by txtrone
Will do. I look forward to making turning some motors.

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24 Sep 2020 22:55 #183642 by txtrone

I would not use 48V on a 50V drive. The back EMF could kill them.

40v would be safer. Just my opinion

I agree, the first time the machine stops abruptly, it will kill the drive.
Gecko uses 100V MOSFets on 80V rated drives so i have seen plenty of them go up in smoke, but i never managed to kill one of them as they do mention on their web site and provide the schematics for wiring a power resistor and a relay to prevent from killing the drives. I have yet to see some one else use that. I know i did.


Hmmm. Should I start another thread asking about what drives I should get? I have a lot of questions about that as well. Getting the PC loaded up with LinuxCNC was priority. Next I want to get the motors turning properly. I am open to try some other drives. KL model drives have been mentioned. Any others I should look at?

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24 Sep 2020 23:07 #183643 by txtrone

Try this shopping list.

1 x Mesa 7i96,
1 x THCAD-5 (for 50:1 divider) or THCAD-10 for others,
1 x thcad-5 for ohmic sensing (Hypersensing)
Mesa DIN rail mounts
Mesa Common x 2 bus rail with their din Rail mount
1 x 2 amp 24v Meanwell DIN RAIL power supply for field power
1 x 2 amp or similar 5v power supply for logic
1 Meanwell HDR 15-24 isolated power supply for ohmic sensing
1 x 25 k 5 Watt resistor for ohmic sensing
1 x 390k resistor for ohmic sensing
3 x 90 ohm x 5 W power resistors for reliable arc OK
An IEC connector with built in RFI filter for mains power input
Stepper motor power supply to suit
Stepper drives to suit.
Mains fuse,
estop switch
Odroid H2+ with 4 gb RAM (8gb optional)

You might use some relays but really the 7i96 has them built in so there is no need to add more components and failure points.


Ok, so far I ordered a Mesa 7i96 and some DIN rail and one Gecko 251x to make sure I could get that much to work before I hauled off an bought the entire list.
I also ordered these power supplies:
-Mean Well USA MDR-60-24
-MDR-10-5
-HDR-15-24
-NDR-480-48

For the PEM I ordered this one:
www.alliedelec.com/product/schaffner/fn9264-10-06/70254153/


Is this the item you suggested, if so do I need just one of these and one of the din rail mounts for it? They sell the din rail adapter mounts in packs of 2 or 3.

store.mesanet.com/index.php?route=produc...id=230&search=common

I am holding off on the resistors and THCAD for the moment... just until I get the motors moving properly. Thanks again!

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24 Sep 2020 23:57 #183650 by BeagleBrainz
I was just reading a pdf regarding controls panels & noise. The recommendation was to have a separate noise filter placed physically close to each switching PSU, as they can create a bit of noise. Linear power supplies aren't as "noisy" but are a little larger. The documents is geared for industrial situations but it makes for an interesting read.

literature.rockwellautomation.com/idc/gr.../gmc-rm001_-en-p.pdf

On the driver I'm using for my AC servo motor spindle the manufacturer recommends a noise filter for the power terminals for the drive's motor circuitry & a separate noise filter for the drive's logic circuitry. As well as an single phase AC line reactor.

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25 Sep 2020 00:54 #183660 by txtrone

I was just reading a pdf regarding controls panels & noise. The recommendation was to have a separate noise filter placed physically close to each switching PSU, as they can create a bit of noise. Linear power supplies aren't as "noisy" but are a little larger. The documents is geared for industrial situations but it makes for an interesting read.

literature.rockwellautomation.com/idc/gr.../gmc-rm001_-en-p.pdf

On the driver I'm using for my AC servo motor spindle the manufacturer recommends a noise filter for the power terminals for the drive's motor circuitry & a separate noise filter for the drive's logic circuitry. As well as an single phase AC line reactor.


That is basically how my 'main' rig is setup. I think Tom at CandCNC gave me that advice. Thanks for sharing the pdf.
The following user(s) said Thank You: BeagleBrainz

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26 Sep 2020 18:22 #183864 by txtrone

www.geckodrive.com/support/g251x-rev-9.html


Sorry, I should have asked for a link to motors. Mainly to work out the voltage you need.


I finally got my hands on this.
Attachments:

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26 Sep 2020 19:23 #183871 by txtrone

Try this shopping list.
1 x THCAD-5 (for 50:1 divider) or THCAD-10 for others,
1 x thcad-5 for ohmic sensing (Hypersensing)


Do you mean I need 2ea of the THCAD-5? I am using a Hypertherm Powermax 85

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26 Sep 2020 20:38 #183880 by rodw

Try this shopping list.
1 x THCAD-5 (for 50:1 divider) or THCAD-10 for others,
1 x thcad-5 for ohmic sensing (Hypersensing)


Do you mean I need 2ea of the THCAD-5? I am using a Hypertherm Powermax 85


Yes. 50:1 will give a maximum scale of 250v to cover the useful cutting range but the THCAD-5 can handle 500v indefinitely for safety.

And also yes, grab the Mesa common connector you linked to. You can connect your 24V logic power + and - to the separate halves and then you can patch the power to wherever you need to for any inputs or outputs. It makes for a very compact design.

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26 Sep 2020 20:50 #183881 by snowgoer540

Try this shopping list.
1 x THCAD-5 (for 50:1 divider) or THCAD-10 for others,
1 x thcad-5 for ohmic sensing (Hypersensing)


Do you mean I need 2ea of the THCAD-5? I am using a Hypertherm Powermax 85


If you don’t mind taking it apart and switching it to 20:1, I’d use (and PCW recommended) that divider setting and a THCAD-10. It gives you 0-200v range where your max cutting voltage is somewhere around 150-170v. They all have the same 500v over voltage. So that combo gives the highest resolution.
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