R2210 single ended TTL encoder interface ???

[Splint]

Hi,
I intend using R2010 servo drives and I have Renco 75900 005 encoders, see here for spec sheet http://www.cnczone.com/forums/attach...achmentid=1778 http://www.cnczone.com/forums/attach...achmentid=1779 The encoders have 4 outputs (gnd, +v, A and B) so I understand this means I need one R2210 single ended TTL encoder interface for each servo drive. I've found almost no information on the application and wiring of these componants on the rutex site so I'm pretty vauge on how it all works. Would I be correct in saying that the encoder interface is wired closely to the encoder and a seperate cable runs from the interface to the servo drive and if so what's the part number and where do I get the cable? I notice in the picture of the R2210 that there are 5 terminals but my encoders only have 4 wires, is there a wiring diagram somewhere for these?

Cheers
Splint

[Al_The_Man]

It looks to me as if you will need pull up resistors for those encoders, there does not appear to be any other components on the Rutex encoder interfaces apart from the terminal to socket items, before I purchased anything like this I would expect to get a detailed description from Rutex or whoever I am buying from. The fifth terminal is possibly either a shield connection or maybe an index pulse, if the encoder had one.
If you run say 20awg shielded cable, could you not run the cable direct to the drive?
There is an Australian Electronic supply house that is now advirtising in N.A. (I forgot the name) but If they are large enough it should be easy to find.
Al.

[dpaulson]

Check this link out.
http://www.rutex.com/pdf/R90H.pdf
The diagram is for the r90h board, but it shows you how to install the resistors. Vlad has changed the configuration of the 9 pin connector on the r2x series, so you'll need to follow the correct pin out. A single ended encoder is suscepable to noise, so it is only good for short cable runs (maybe 4 ft at max). I would suggest that you purchase the r516 board from rutex. It changes the single ended encoder to differential output.

[Splint]

Al, what is N.A., is that a trade publication, a website?

North America
Al.

[Splint]

Just one other question,

the outputs have a cable port, is that for a usb cable? Usb 1 or 2?

Thanks
Splint

[rutexus]

Gentlemen,

Admittedly, our documentation on the 2000 series is very lacking at this point. The single ended adapter (R2210) that you identified has an IC on it to convert the single ended ttl signal to differential. No resistors anymore, please. Although you CAN use single ended (TTL or open collector encoders) with resistors, it is an invitation to noisy interface and trouble. You were correct in the configuration. You connect the 2210 right next to the encoder, plug in a cat 5 (RJ45) connector and cable between the adapter and connect it right to the 2010 drive. That's all there is to hooking up an encoder to the rutex drive. All of our little adapters (for single and differential encoders) sell for $17.00 each. That's not on the website yet. We will throw them in free until you can order them from the web site and pay for them.

I hope this helps.

Tom Eldredge
Rutex LLC

[rutexus]

Gentlemen,

The cabling for the 2000 series drives is simple:

A straight through printer extension cable (db25) connects the 2110 mother board to the PC printer port. It carries extra I/O signals to the mother board for break out. One of the outputs can be used to drive the charge pump circuit that another vendor sells for $19.00 I think, so that one cable can be used for everything in the servo system. The limit switches interface to the mother board with the db15 on the mother board. The other i/o signals are accessed in this way too, as I remember.

As far as the quality of the RJ45 cabling for the encoders are concerned, use a good quality cat 5 cable. I am using stranded, shielded RJ45's so far. They are so cheap I don't know why anyone would skimp on those cables.

I have also made a little pcb adapter that can be soldered directly to the 10 pins of the US Digital E5D and E6D connectors with a RJ45 modular jack right on it. It makes a slick hook up. I intend to sell these too. If you want some, let me know.

Remember the limit switch circuitry is on the drives, so an inexpensive limit switch can be connected to the drive and it will control the motor whatever way you configure it to respond to the limit switch. You set this up in the tuning process. The limit switch status is also reported back to the pc through the db25 cable so that the control can also respond to the condition.

A 2000 series I/O board is in the works too, but has not been built yet.

You all have been very patient with us, and I thank you for this. Getting the bugs out of the tuning software has been a challenge. The previous version of it was written in Microsoft's visual studio, and required the user to have a 20 meg .net file in the tuning directory of your computer. This was un-acceptable to us, so Vladimir just finished re-writing the whole tuning program again. These things have caused painful delays.

There have been two minor bug fixes in the 2000 drive firmware also, but I re-flashed the firmware in the drives in our inventory here in the USA, so we are ok on that. I think they are working great now, although the new tuning software has not had much testing yet in the field.

The new tuning program runs great on our DEL laptop running XP home edition. For some reason, I'm having a little trouble with in on my desktop running W2k professional. I may have messed up something on that PC. Vladimir has it running on 5 different computers using W2k and Xp, fast and slow. I really enjoy tuning a drive with the new software. I like the windows buttons that allow me to raise or lower a pid value and push on the motor shaft and feel the effects immediately while I adjust the values with the mouse and the values run up or down in their prospective windows. It speeds up the process.

I also love the current monitoring that the drives do. If a drive breaks into oscillation while tuning, after two seconds the drive lowers the current back to the current fall back limit and the drives protect themselves from the current produced by the oscillation. When I get it back under control, the full current is again applied.

Thats the present status. I'm expecting Vladimir to ship me a shipment of the 2020 drives later this week. Those are the 40 amp 200 volt drives. Allow a week for them to get into my hands. International shipping has been a little slower than usual in the past month.

If you want to discuss details on the drives more, you can call me at 573 341 1528.

Thank you again for your patience as we get the next generation of drives moving.

Tom Eldredge
Rutex LLC

[Splint]

Thanks for the replies folks,
just one further question in regard to sheilded cables, is it required that I have only the a and b wires sheilded, or should I also have the encoder power supply wiring sheilded or should everything be sheilded including the wiring for the motor?
Sorry for all the questions, electrical is a very weak point for me.

Thanks
Splint

[dpaulson]

I don't think that you'll find a cable that has 1 pr wires sheilded and the others not. You'll find either 1 shield around all the wires or each pr of wires individually shielded. I think that if you have the individual pairs sheided, you may as well use them as well. I don't know if it is required, but it would not hurt to have them connected.

[rutexus]

Splint,

I am not a specialist on wiring etc. either, but I'll tell you my experience with shielding on the Rutex drives:

Since I have always used differential encoders, with the A, A/, B, B/ signals, I have never paid much attention to shielding. I use shielded wire, but never hook up the shields on either end of the cable. The encoder cables enclose all of the encoder signals plus the encoder power wires within the common shielding. We use 20' cables, and I've never had a problem. For the motor power wires, we also use a shielded pair, but again, we never hook up the shields on either end. These two cables go inside of cable troughs with other wiring. I have used ttl encoder hook ups where the drives have been less than 3' from the encoders and where there is no electrical noise, and very low powered motors. As far as I'm concerned ttl, open collector interfaces etc. are invitations to trouble.

I am 57, and have spent my whole life working with electronics, thus have lots of experience fighting electrical noise--made cnc plasma cutters, and lots of stuff that made noise. I have read over and over again the specifications that give detailed instructions on shielding one end of the cables etc, and then seen the companies themselves who print these specs. produce equipment in which they ignored their own specifications regarding shielding, and don't hook up the sheilds. I have seen it done in many different ways. I have made equipment were if every part of the electronics was not shielded carefully you would have serious problems.

I am saying all this to say, If you use differential encoders with the Rutex drives, and use shielded RJ45-8 conductor cables (CAT5) you should have no problems. Don't spend too much time sweating this aspect of servo control using the Rutex drives. If anyone else has had a different experience I'd like to hear about it.

This might not be the way it is on drives made by competitors.

Tom Eldredge, Rutex LLC