Newbie- mitsubishi MR-J2-C-S100 drive help

[ZAGNUT]

so i've decided to wander into the world of CNC and make a small gang tool lathe to crank out parts. the mechanical side of things will be easy for me but i'm totally clueless when it comes to the electronics. so far i have acquired a trio of mitsubishi drives and their matching servos, all of them are the MR-J2-xxC-S100 model.

i am at a total loss on how to hook these things up to something like MACH3. other than RS-485 the only thing i can see on the data sheet that resembles a way to control them externally is the MPG connection....and neither look like they would work with MACH3.

i need a good bit of guidance here to say the least.

the manual: https://my.mitsubishi-automation.com...er.php?id=1373

[Iron-Man]

Originally Posted by ZAGNUT so i've decided to wander into the world of CNC and make a small gang tool lathe to crank out parts. the mechanical side of things will be easy for me but i'm totally clueless when it comes to the electronics. so far i have acquired a trio of mitsubishi drives and their matching servos, all of them are the MR-J2-xxC-S100 model. i am at a total loss on how to hook these things up to something like MACH3. other than RS-485 the only thing i can see on the data sheet that resembles a way to control them externally is the MPG connection....and neither look like they would work with MACH3. i need a good bit of guidance here to say the least. the manual: https://my.mitsubishi-automation.com...er.php?id=1373

I have been looking at the pin out diagram for your MR-J2. As you know, Mach 3 provides a step (pulse) and direction output. Page 8 of the manual shows pins 3 and 2 for forward and reverse command pulse train. It may be possible to use a 4016 quad bilateral switch to make Mach 3 work with your servos. You will have to experiment. Please reference 4016 quad bilateral switch You will want to use high speed devices. Please reference the graphic. When enable is LOW input A is connected to output A1. When enable is HIGH, input A is connected to output A2. In other words you could connect the direction pin to the enable pin and step pin to input A.
Outputs A1 and A2 would connect to pin 3( PP) and pin 2 (NP). Do not forget the NOT gate in the design. You should test it on a disconnected motor for safety. In other words you need a high speed digital switch where you can switch a singe input to 2 outputs.

Hope this helps,


Iron-Man

[ZAGNUT]

Originally Posted by Iron-Man In other words you need a high speed digital switch where you can switch a singe input to 2 outputs. Hope this helps, Iron-Man

thank you, that's exactly what i was thinking i needed but had no idea that it could be accomplished so easily.

now i'm wondering how it would all work out timing wise. certainly there is some kind of delay between the direction signal and the step signal in mach3? i mean other types of drives have to have time to process the change in direction as well, right?

and in the attachment below: what is this "open collector system, differential receiver system" stuff? to me it looks like code for "connect me wrong and i fry"...

[Iron-Man]

Originally Posted by ZAGNUT thank you, that's exactly what i was thinking i needed but had no idea that it could be accomplished so easily. now i'm wondering how it would all work out timing wise. certainly there is some kind of delay between the direction signal and the step signal in mach3? i mean other types of drives have to have time to process the change in direction as well, right? and in the attachment below: what is this "open collector system, differential receiver system" stuff? to me it looks like code for "connect me wrong and i fry"...

Here is a link to a simple explanation of open collector: Open collector - Wikipedia, the free encyclopedia

Here is another CNCzone link, study this: http://www.cnczone.com/forums/genera...ir_cw_ccw.html

For your application, I believe that you only need pins 3(PP) and 2(NP). The above link may provide a better solution depending on what chips you have access to. The propagation delay will probably not be a problem. Mach 3 will generate the timing signals, just make sure that whatever device you use it is faster than Mach 3. You should prototype it on a bread board. An oscilloscope would be helpful if you have one. The link above uses 7400 ICs, see this link for specs: 74 Series Logic ICs

The 7400 series has an operating frequency up to 25 Mhz. The 4016 has a operating frequency up to 40 Mhz :http://www.cedmagic.com/tech-info/data/cd4016.pdf

The set up on page 6 of the manual must be for a MPG with differential output. Just try pins 3 and 2. Forward Pulse, Reverse Pulse. At 25 Mhz or 40 Mhz there should be no problem using Mach 3.
See this link: http://www.cnczone.com/forums/mach_m...do_100khz.html


Hope this helps,

Iron-Man

[ZAGNUT]

thanks, looks like some good solutions are out there. need to dig the servos out to see what kind of pulse rate i need. also looks like there are much higher speed versions of that IC like the 4066 that can handle switch rates way up in the MHz range.

and i do have an old but working 'scope but the controls and the manual are in russian might be time to get my neighbor over to do some translating...

[dm1try]

i haven't seen that drive in person, but looking at connector pinouts in the manual it lookes like that the hardware is identical to the A-series drives. if it is, you can try to reflash it with the A firmware. wanna try?
edit: oh, that J2, not J2S. i don't have the firmware for it. have to find any J2-A drive first...

[ZAGNUT]

that's an interesting idea even though my track record with firmware reflashing isn't so hot....the more expensive something is the better my chances of bricking it...

anyways, i would wanna scrutinize the guts of both before taking that route. when i dig mine out of storage i will open it up and take some hi-res photos.

[vigen20]

You should find the solution here --->
http://www.cnczone.com/forums/servo_...tml#post597464

Go through all 11 pages, I have mine MR-C20A connected in similiar way.

[ZAGNUT]

Originally Posted by vigen20 You should find the solution here ---> http://www.cnczone.com/forums/servo_...tml#post597464 Go through all 11 pages, I have mine MR-C20A connected in similiar way.

i went through that thread before and didn't see a solution. it seems that these drives were meant to be used in a standalone manner with no external commands other than when to start or stop.....or at least that's what the manual leads me to believe. but on the other hand there is mitsubishi literature that describes them the same as the MR-2JA but with added features any first hand real world info is next to impossible to find.

anyways, i've dug them out of storage and will soon start poking them with a stick to see how they respond...