Need Help!- Stepper motors acting strange and getting very hot?

[MadKad]

Hi

Ok I wired up my stepper motors (Mema23) and plugged them in to test my system and the motors, as soon as the system comes on the stepper motors start acting funny

1 makes buzzing sounds and gets hotter and hotter to the stage you cant touch it

1 gets hot but not as hot as the other but doesn’t make any sounds

1 does nothing not hot or noisy

Now I never got to the stage of testing them as I shut my system down before I damaged anything, I did test them on different axis connections to see if it was my controller board (HobbyCNC EZ driver) and they did the same.

Is it the way I wired the stepper motors?

The controller board?

Or the stepper motors?

Can any one point me in the right direction please, thanks for your time also.

[Crevice Reamer]

What motors are you using? What power supply? HOW did you wire them.

CR.

[MadKad]

Hi thanks for your reply

I wired them like this

> http://img.photobucket.com/albums/v4...2306/wires.gif
>
> The others in the image that dont show any resistence I just left
> blank
>
> By the looks of it to me its
>
> Black as a commom
> white + red is A
> Red is a
>
> White is a common
> Green is B

I was told thats ok but if the motors go the wrong way when running to change over A - a or B - b but not both.

Motors are these http://www.techkits.com/#slosyn

for power, I am running at 36v as again I was told that this would be best for my motors and board, hope it is.

thanks

[Crevice Reamer]

White/Green is b

If your drive has only 5 connections, then connect the two commons to the same terminal.

Your motors are only rated 1 amp. Do you have the current limited to only one amp?

CR.

[MadKad]

Originally Posted by Crevice Reamer White/Green is b If your drive has only 5 connections, then connect the two commons to the same terminal. Your motors are only rated 1 amp. Do you have the current limited to only one amp? CR.

yes sorry I mist that Green + white is b I do have them like that also.

for the amps I forgot to alter that, the board is adjustable could this be the problem then?

also erm do you think I could have broken the motors?

also sorry any tips on how I test that I have set each axis to 1 amp with my multimeter?

[jalessi]

MadKad

The test points should read .14 volts dc. for 1 amp motors.
VR1 VR2 VR3 VR4 are the current adjustments for the Hobby CNC 4 Axis board.

Jeff...

[Crevice Reamer]

Yes! Running 3Amps into a 1 amp motor will definitely overheat them. You won't know if they are cooked until you try them at 1 amp though.

Amps are measured in series. If your multimeter has a DC Amp setting for 3 or more amps, (or a plug for a test lead) then set it up that way and then clip the meter leads in between the drive and one of the motor leads. Make sure the connections are TIGHT. If a wire comes loose, it will cook your drive.

CR.

[jalessi]

MadKad


The HobbyCNC EZ driver does not have idle current reduction, this means the motors will run hotter.

Jeff..

[MadKad]

thanks for all the replies I feel really daft after my last post I got the paper work out for my HobbyCNC EZ board and found info on setting it all up for the amps

I am going to set that all up and see again after I just hope I havent done anything to the motors, I have a feeling one is faulty anyway as I tested every one of them to check the cables and one was showing a very different rating on one cable and that was the one that stayed cold also.

I will be back with one good answer or a bad one.

again thank you every one.

[Crevice Reamer]

Which wire, and what do you mean by cold?

CR.

[MadKad]

Originally Posted by Crevice Reamer Which wire, and what do you mean by cold? CR.

Hi

the two other steppers go warm like some one up there said they will but one stays cold, I checked them now that I have sorted the amps out and the other two are hard to move by hand when powered but this one that is cold moves freely so I guess its broke like I thought

When I said checked the wires I meant to find out how to connect them to the driver board I checked the resistance of all the wires on one stepper and got my answer like this diagram I did:

http://img.photobucket.com/albums/v4...2306/wires.gif

(yes the long way round but I learnt something from it) after I did one just to fully check I did the other two and one stepper was showing a different resistance rating on two of the wires from a com to I think it was wire a instead of a 4.2 it was a 2.3 from what I can remember.

I am now just setting things up to test the motors to see if I can get them to move and work will be back

[Crevice Reamer]

Black to Red or Black to Red/White should be 4.9 Ohms. Red to Red/White should be 9.4 Ohms.

White to Green or White to White/Green should be 4.9 Ohms. Green to White/Green should be 9.4 Ohms.

Try reversing direction on the "cold" motor.

Try the "cold" one on a different axis driver.

CR.