Stepper Motor Wiring

[Stuart Smith 5Participant @stuartsmith5]

Alan

Are you sure?

The purpose of the 24v 5a power supply S120-24 is to provide the power for the steppers and with your latest diagram it isn’t.

Stepper drivers are usually supplied with dc.

Stuart

[SillyOldDufferModerator @sillyoldduffer]

I agree with Stuart: the first diagram is right, the second is wrong. As I noted this driver runs on either AC or DC.

The manual says 'Input voltage 18-80VAC or 26-113VDC'

And this photo shows the AC terminals also have + and – markings.

No need to add an AC transformer, the DC supply is suitable.

Dave

[Alan McDadeParticipant @alanmcdade29638]

Thank you John and Martin for your really helpful advice.

The DM860H driver I have does not show the "+" or "-" after the AC in the High Voltage silk screen printing like in the photo above. I do note that it does say "VAC: 18V~30V VDC:24–110V" in the same place as in the photo above. So I take it then, I am OK to connect a DC 24V supply from the PSU to the DM860H driver and remove the step down transformer as shown below:

Again, many thanks for your really helpful advice which has given me confidence in what I am doing with this little project.

[Stuart Smith 5Participant @stuartsmith5]

Alan

I looked for a manual online and found the same one that Dave has added a picture of.

If you look at that, the negative needs to go to the end terminal and positive to the next one. On your proposed layout you have the connections the other way round.

Stuart

[Robert Atkinson 2Participant @robertatkinson2]

I agree that no transformer is needed. I don't think it matters what way around the DC supply is connected to the AC/DC terminals. This is because A. The input almost certainly has a bridge rectifier which will "switch" the current the right way, and B. the control inputs are optically isolated.

Robert G8RPI.

Edited By Robert Atkinson 2 on 21/12/2022 12:32:23

[Alan McDadeParticipant @alanmcdade29638]

Stuart, – many thanks – I have fixed on my diagram.

Robert – thanks for your help.

[Author]

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