Use common ground for circuit

Other Hardware General Electronics
1

Hi all,

I have a circuit with 3 motors (24, 12 and 5 volts each), one 24 v power supply and connected to it, one 24 to 12 V DC converter and another 24 to 5V dc converter

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I would like to know if I can use the ground directly from the power supply to all my circuit instead of using the grounds output by the DC converters?

And, could I connect all grounds?

Thanks!

2

It'll likely boil down to the same because virtually all DC-DC converters are not isolated.

3

So you mean I could?

4

Most likely yes. Use a DMM to measure continuity between the input - and output - on your DC converters. I bet you'll read 0 Ohms.

5

In your circuit of post#1, you have only --
G and
GND

I assume that your power supply (220VAC ---> 24VDC) has an ielectrical solation (transformer or AC-to-DC Converter).

G should not be connected to any of the GND pins as it the earth side of 220V AC supply.

All GND-pins can be tied together.

6

Hi,

yes, it is 220vAC -> 24VDC, it is this one https://www.amazon.com.au/gp/product/B0CF5RV7YN/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1

Got it, I should only tie all GND together, cool.

tks

7

G at the power supply side is essentially connected with the metallic body of the swicthing power supply as a saftey.

8

Welcome, Thanks for the schematic. That could form ground loops and possibly damage some of the converers, device design controls this. BUT When I use converters I get the ones where the ground is passed through from input to output and connect all of my grounds. You can check this by putting a load on the converter and measuring the voltage from ground in to ground out, if the same it is probably passing through.