Stepper Motor Wiring

Slightly odd that the DC supply goes to the AC input on the stepper driver. Is that correct by the manual? It doesn't show a polarity so I guess the driver must have its own amps to isolate the input.

That particular driver can be fed AC or DC. If DC, minus is the end terminal, as shown in Alan's diagram. Unless I'm being stupid the rest of Alan's diagram is correct too.

The way the enables are connected depends on which way round the controller logic is set. (ON/OFF can be either 1,0 or 0,1) Not a problem if it's wired wrong, the motor just won't obey orders. Fixed by grounding the other way round, + rather than -.

Dave

The only diagram I could find for this controller did not show what the outputs are doing and did not show a recommended connection to a driver. I thought it may be a recommendation from the controller paperwork. The worst that can happen is nothing. The connections for the driver module show either the +ve terminals commoned together and connected to Vcc or the -ve terminals commoned together and connected to the ground terminal. In the absence of proof one way or the other try the wiring as shown. If it doesn't work then look at the driver module diagrams and try them instead.

Martin C

Thank you Martin and John which prompted me to look again at my wiring diagram and noted a mistake, so I consulted the Driver manual and noted the AC input is 20 ~ 70 v AC and not DC as I had thought - phew!

Update diagram is below. I added a step down transformer (240vac to 24vac) for the driver power. I also checked the ground and have it correct - as shown in the circuit diagram from the manual.

Great comments guys - anymore advice is welcome.

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

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

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.

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

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

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

Robert - thanks for your help.