Messages

1

General Mach Discussion / Re: need help with steppers

« on: February 04, 2009, 05:56:24 PM »

I took the controller apart and googled it. The board was built by Geom It is a pwm chopper driver board based on the sla7062m unipolar driver chip. It has three chips configured for the 5 din outputs. The controller comes with a switching powersupply that powers the board and supposedly puts out 4 amps to the steppers. Since this is a unipolar driver board it makes sense that the kl23h276-30--8b motors were wired for unipolar. But they were slightly miss-wired. I changed that and it didn't help these motors are specd for 3 amps in unipolar. Is the 4amp coming from the controller enough to lock them up and make them run insta hot? Could it be that one or both of the A or B phases are miss wired? I guess I can try every logical config now that I have the schematics for the motors and see if I can get these things to turn in unipolar config. I'll post back what I figure out.

2

General Mach Discussion / Re: need help with steppers

« on: February 04, 2009, 02:49:53 PM »

Thanks Rich,

I swapped the red wire for the blue wire as the diagrams suggested and this didn't change anything, tried all the various config and tuning steps in mach 3 and motors still get hot fast and are locked up. I think I am down to current coming from the controller that is causing the problem.  It appears that the unipolar wiring is what I have in place as stated above all the other wires are grouped together and according to my wiring chart they should be using 3 amps and 2.7 volts, how would I check to see what voltage is being passed from my controller using a dmm? If I am passing too much it would lockup my motors this way right? If so I could simply rewire them to another config that is more compatible with the voltage. I'd like to try this before I break down and buy different drivers to put in this controller box. all replies welcome

3

General Mach Discussion / Re: need help with steppers

« on: February 03, 2009, 12:45:22 AM »

Ok on further investigation I found the wiring schematic for the keling kl23h276-30-8b motors online. It shows the various ways they chould be wired. It appears that they are wired either bipolar series or unipolar. And they miss-wired them. Currently they are wired up to a 5 pin female DIN socket plug, the black blue orange and yellow go to the center common pin and the others red green white and brown each go to their own pin which I assume corresponds to A+ A- B+ B- and the diagram shows that it should be Red that goes to common instead of Blue. Could it be that simple that they just got these backward when they wired these up at the factory? and switching the two wires on each motor will fix my problem! I'm such a newbie. Thanks for any replies.

4

General Mach Discussion / Re: need help with steppers

« on: January 29, 2009, 10:51:12 AM »

Thanks I will try the tutorial on the gecko website and post back, It might be a few days.

5

General Mach Discussion / Re: need help with steppers

« on: January 29, 2009, 10:48:44 AM »

I did have it a while ago but as I recall it was scant. They mostly just gave me the videos and documentation from the mach 3 site. This unit is plug and play after all. I think what happened is the stepper upgrade I got didn't get reconfigured or wired properly in the controller or wired correctly for the motors. The unit usually comes with slightly weaker motors. What happens is when I jog the units come to life sort of they just dont move. So I have mach 3 set up fine and the configuration is getting to the steppers, they just don't turn. They do get hot and fast. Maybe they sent me the wrong motors for their config? or just wired them wrong? The controller unit consists of a controller board and power supply with inputs and outputs for the pc and motors. The Nemas are wired with red, green, brown and white each having their own separate lead and blue orange yellow and black grouped into a fifth lead. when the motors are active or with the motors detached would getting readings from the pins tell me anything? I saw a site that describes stepper motor wiring somewhere maybe that would help.

thanks

6

General Mach Discussion / need help with steppers

« on: January 29, 2009, 03:38:08 AM »

Hello, I have a homemade CNC machine with a controller I purchased a year ago from cncresource.com it is based on a geom mcu and is setup to control 3 axis. It came with its own mach 3 config. It's supposed to be plug and play ha. However when I purchased it I upgraded to the 200 oz in steppers, I basically have locked motors, they chirp and alternate between making noise and quieting down when I hit their axis jogs but they do not turn. The config they sent me seems to be ok but i don't know if they are wired correctly or maybe they are getting too much current. They have gone out of biz and I have to way to get direct support. They are 30v 3a 8 wire bipolar nema 23 200 oz steppers. I have read thru most of the posts here and have tried all the config and tuning steps ad naseum. I think I'm down to current and wiring. I just don't know how to troubleshoot this. thanks for any help.

Hank