View Full Version : Power Supplies

25-01-2016, 04:39 PM
I bought a controller/motor/driver/2xPower supplies set from ebay last week.. it's still on its way but I have realised that the kit I chose didn't have the power supplies in. Annoying! I thought it was a bargain :) It's too late to cancel so I need to sort out the power supply.

The kit I intended to get came with:

4 pcs Nema 23 stepper motor with 425 oz.in 23HS9442

4 pcs stepper motor driver DM542A, peak 4.2A, 128 micsteps, replacing M542
2 pcs Power supply 350Watts (36VDC/9.7A)
1 pc Breakout board & 1 pc Parallel cable

Does anyone have any recommendation for what I should get? Just replace with the same or would I benefit from a higher powered unit - or 2 higher powered units even?

Budget end of the spectrum by the way :)

25-01-2016, 05:15 PM
You could make your own powersupply. I am sure I saw the diagrams on here somewhere. 36V is a good place to start but you could push the Nema 23s to 48V if needed.

see: http://www.mycncuk.com/threads/9333-Wiring-Diagram-check

25-01-2016, 05:22 PM
I'll be honest - building a power supply doesn't do it for me :) I'm just going to go for an off the shelf solution.

Is there a good reason that 2 power supplies were part of the kit?

25-01-2016, 05:33 PM
yes, they are both 350W which would limit the current that the total of 4 motors would be able to draw at any given time.

You could probably buy the same powersupplies that were in the kit locally too.

25-01-2016, 05:40 PM
That was my suspicion but I thought a better quality higher rated PSU might have sufficed as opposed to 2xcheaper units

25-01-2016, 06:00 PM
OK from what I can gather I need around 11.5A from the power supply. I have a choice of 2x 350w 7.3A or 1 x 600w 12.5A.. What is my best option?

26-01-2016, 12:03 AM
Which option works out cheaper?

26-01-2016, 12:05 AM
64 and 66 respectively

26-01-2016, 12:11 AM
2 times the 350w would be my choice then ;)

26-01-2016, 12:20 AM
Cheers! some things can look too obvious when you don't know :)

27-01-2016, 08:32 PM
64 and 66 respectively

Hmmm.. are you sure ? $30 for me... http://www.aliexpress.com/item/600W-48V-12A-Small-Volume-Single-Output-Switching-power-supply-Transformers-AC110V-220V-TO-SMPS-for/32549006298.html?spm=2114.01010208.3.1.erC4M6&ws_ab_test=searchweb201556_1,searchweb201644_4_100 01_10002_10005_10006_10003_10004_401_62,searchweb2 01560_1,searchweb1451318400_6149,searchweb14513184 11_6448&btsid=774e20e7-57c7-4f4f-ba68-830534792d55

I buy all my PSUs on AliExpress, they work great. (though my main PSU is a linear DIY)