Retrofitting my maho mh400c
Hello everybody,
I would like to retrofit my Maho mh400c with emc2.
This is because the old philips 432 control is broken and it's getting harder and harder to find the right parts for it.
I would like to use the original indramat 3trm2 servo drive and the linear encoders.
I found the following thing: http://www.cnczone.com/forums/showthread.php?t=74532/
It takes the step/dir signal and makes it into an +10v/-10v signal.
Perhaps its usefull?
Any info that can be usefull for my build would be highly appreciated.
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hi
a macho has recently been done, check out the linuxcnc.org forum for more info on it
or click here
http://www.linuxcnc.org/component/op.../lang,english/
its a bit bigger machine
im sure the person who did this one will give some insight into what he has done etc.
rob
What you suggest can work, but it is a poor approach. A major problem is the rate at which software can spit out step pulses is often too low, and severely limits the machine speed.Originally Posted by pirke86
There are a number of advantages to getting rid of the steps entirely. There are several interfaces available for EMC that generate analog velocity commands to existing servo amps. These also have encoder counters and digital I/O for spindle control, coolant, etc. Mesa makes a couple lines of these, Pico Systems (my company) makes a flexible board "set" so you can plug in only the functions you need. See
http://pico-systems.com/oscrc4/catal...ex.php?cPath=8
While this package may at first seem more expensive than Mesa's, it includes everything you need, so no cables, break-out boards, adapters, etc. are needed to complete the system.
Jon
jmelson,
This would be the perfect solution!
Can i use all the original component if i use your components?
Indramat,Tachos and encoders?
And what do i need for 3 axis.
Could you make a list of all the parts i would need for the complete retrofit?
If the Indramats are classic velocity servo amps, then you should be able to use all these.
The Tachs would feed back only to the servo amps, no rewiring or changing of servo amp tuning required.
The Pico Systems PPMC board set handles up to 4 axes. The left over channels can be used for other things like jog dials or spindle encoder. The basic PPMC set runs $780, or $855 with power supply and IEEE-1284 cable to the PC.
Jon
i'm still looking at the mesa boards, they are a lot cheaper...
but i still dont know how it all works together...
The price difference is less than you think, as the Mesa requires a lot of adapters, breakout boards, cables, Opto-22 mounting boards, etc.i'm still looking at the mesa boards, they are a lot cheaper...
but i still dont know how it all works together...
The PPMC has everything included on the boards except the actual SSR modules, so you can choose AC, DC current and voltage for your needs.
Either way, the encoders feed position info into the encoder counter inputs, and the analog velocity command output goes to the servo amp's command inputs. The Mesa produces a PWM signal that then goes into a PWM to analog converter. With the PPMC, there is a separate 16-bit DAC for each axis that produces the +/- 10 V velocity command. The only non-standard stuff you need to deal with is the signal that enables the servo amp, and sensing a fault condition from the servo amp. Usually, this can be done with some opto-couplers.
With the PPMC, your home and limit switches connect to digital inputs on the DIO board, their assignment is made in EMC2's hal files to specific functions. Servo enable, spindle and coolant control, etc. are routed through the hal files to the DIO board's digital outputs, where solid state relays are turned on.
Does this clarify it some?
Jon
I'm gonna go with the mesa boards.
Everybody is very positive about them.
But there's anothor problem, my linear scales dont put out a quadrature wave.
apparently they give a sine wave.
I've been told this could easily be fixed witch a custom circuit using a comparator, but i'm no electrical engineer...
I've found somebody who can build this for me but i wonder if there is a existing solutions for this.
so basically my shopping list is the following:
A computer (of course)
A 5i20 card
A 7i33 card
A 7i37 card
Maybe another 7i37 card?
Some AIO 50 pin cables
Something to fix the sine wave to quadrature
What did i forget?
I find this thread very interesting. Because I have a Maho mh500C with a old 432 control.
I also have a small info page about the machine
http://smoregrava.net/Maho/mahomh500.htm
And as I work with CNC machines and edgecam i find the memory of the machine a big dissadvantage. I would really love to do dripfeed and be able to run programs that is 50 Mb.
At my work we use Fagor controllers. But I have looked into using Mach3 software and run signals to the 3TRM2 drives.
I'm vondering how much work it would be to set up referance search and get everything up stable.
Keep up this project!
If they are the same as Heidenhain, OR are Heidenhain linear scales, the signal can be of two configurations, either 11µa or 2v p/p.
The normally can be squared up first and then converted to differential driver 26LS31.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.
i havent looked at the encoders but i think their philips glass scales...
Btw
I don't heve to change the tacho's right? they go straight to the indramat drive?
I've got almost the same thread running at linux cnc, perhaps you want to keep looking at that one too?...
http://www.linuxcnc.org/component/op.../lang,english/
I have checked the scales on my Maho mh500 c with Philips 432 controll. My scales is philips scales. The scale is marked PE 2480/00 and the reader is marked PE 2480/10.
Do anybody know what kind of signals these output. And maybe the pin config of the contact. I want to retrofit my machine with another controll but I need to know the signal type.
I'm also interested in PE 2480/10 signals, did you found anything ?
No
I have had a couple of private messages. Thebodger@roger told me he was quite shure it was a Sinewave but not shure the level. And that the signals goes to the LM Board in the controller.
Frank1988 told me it gives a analog output, 0-point and need a + and ground.
My machine is not working so I can't measure this with a Osilloscope now
maho 700
just trying to do the conversion from the old MAHO 700
Phillips, 432 NC at MAČ3 but I do not have any idea how to solve the change of spindle speed by you to resolve
thanks regards
maho
Please Do anyone know why I have a big noise (oscillation) and motor chokes most Y axis while the machine is just stand in the Maho 700 with power steering 3TRM2
Re: maho
Check the machines Earth and 0 Volt, also
Phase Sequence is matter.
regards
Russell Dolat
Re: Retrofitting my maho mh400c
Hello. We are retrofitting a Maho with the same Philips scales. I can't find any technical information about them. Did you find any? Did you use a converter to be able to use them? Any information you can give me will be welcome.
Thank you
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