Need Help!- ServoStar CD amplifier for CNC router

[Oleks]

If someone can help with these questions:

1. ServoStar CD drives have RS232 serial ports for command input. Can 3-4 drives be operated from PC with Mach2-3 (or other soft for PC) ?

2. The drive labeled on front - CR 06 200; side- BASE MODEL NO CP30318; VERSION 3 phase. "CR" is for resolver feedback but seller told that drives were working with Kollmorgen GoldlineXT MT1506A1-E1C1 (motors with encoder). Can it be possible (for Mach2-3 particularly)?

3. Will ServoStar CD "VERSION 3 phase" work from single phase supply?

Many thanks for your time spent on this.

[PBr]

Hello, i have some experiences with the CD drives, hope it helps:

1. Mach generates the step/dir pulses on LPT port of your PC, therefore you must connect your PC to servostar through this port. First you need is set up your drive through rs232 link and the motionlink software. You must use opmode 4 (gearing mode) and then you can connect the right pins from LPT to individual drives (the input connector on the drive is at its top side, 9 pin female).

2 CR as you said, means resolver feedback, you cannot connect it to encoder based motors. You must change the feedback device or buy a new motor.

3. Yes, i work with the 3 phase version powered from 1 phase too. Just simply plug the L and N lines from mains to L1 and L2

hope it hepls
PB

[CNCAddict]

You need to wire up a differential output to the "remote encoder" plug at the top of the drive. Here is some info I received from PMDX about this issue. It seemed to work ok, but you need a good 5V, not the 3V that parallel ports usually have.

"RS-485 step and direction input is possible via the
C8 connector. This input has a 3 MHz step rate limit.
You could drive this input by connecting the step
and direction outputs from a PMDX-122 to the positive
side of the corresponding RS-485 input. The negative
sides of the RS-485 inputs would need to be biased
at about 2.5 volts. This could be done using a resistor
divider from the "E5V" supply on pin 7 of C8 to the
"DC common" on pin 3 of C8. Using two 220 ohm, 1/4 watt
resistors should work and can be shared for all RS-485
negative side inputs. You should also connect a small
(0.1 uF will do) ceramic capacitor from the 2.5 volt
junction to "DC common". The "DC common" would also need
to be connected to the GND output at the PMDX-122 step
and direction connectors. This configuration would
not result in isolation between the computer and the
control section of the Kollmorgen drive, but the drive
probably has internal isolation between its control
and power sections."

[jewe]

Hello,

I actually have bought a Servostar Cd and would like to use the RS232 C8 connector to use with Mach3.
I Would like to first use my CNC4PC BB to test and setup the drive.
Should I make the setup with the Resistors and Capa?
I was hoping a direct input setup using a RS232 and the BB.

Thanks for help,

Jerome

[CNCAddict]

There isn't any way to hook up directly to a normal breakout board. You need a differential signal for the kollmorgen to work at all. CNCbuildingblocks had a breakout board that would do this...but right now he is no longer selling boards

[jewe]

Ok, thaks for the fast answer.

I was asking about because I was searching how to communicate with the C8. Now I must buy small capa. to test.

I'll post when done, maybe with a picture.

I'll use later my G100, but actually Imust send it back for repair. There's a Rabbit problem.

Anyway, thx again.

Jerome

[CNCAddict]

Does the G100 offer differential line drivers?

[jewe]

I don't think so, but at least it should be the same than a BB, so the setup you explained should work. If not I think I'm gonna explore the OP Amp way for 24V signals trough C3 connector. With the Bandwith and added delays effect.... Nothing's perfect. Then I hope to pick an output signal for double check the closed (DDR motor) loop system with the G100 inputs.

I'm looking for a Reducer for maximal stifness, say torque, system capability (+/- 200Nm)
Input is around 9.8Nm nominal Value Rpm: 0 - 400
If you know where to Find... (cheap of course). It' for my new setup, I'll try to go 5 axis milling system.

[CNCAddict]

Hmmm, I would try to use the C8 connector if at all possible. If you can't get the voltage divider circuit working then it may be possible to find a chip that will convert single ended to differential. Whatever the case, it's usually best to keep as high a step rate as possible so your system will be smoother. Also, you have any more info on your design? Sounds like a pretty interesting project, and I may have some ideas to help you out.

[jewe]

I agree with you about connector C8. It's why I first search to work with C8.
Maybe Should I make a new Thread about my project. I'll work on that, with pictures, drawings, explanations etc...

I was a Taig user before this new milling machine, but Taig as some limitations that cannot anymore answer my projects.
Mainly about parts size, machine rigidity and machining speed.

I'll keep this post updated When possible, I havn't got the time to buy the capacitors, maybe tomorrow.

I'll keep you in touch.

[jewe]

I found that in the G101 Manual (same as G100)

Quite interesting....

I'll try to findout how to!

Analog to Digital Converter differential or single-ended mode
(bit 4)
The G-REX has the analog to digital converters default to single-ended mode, in other words there are 4 separate ADC inputs. The ADC mode bit specifies whether the ADC is to operate in single-ended or differential mode. Single-ended mode means that there are four independent inputs, referenced to ground. Differential means that ADC inputs 0,1 and 2,3 are used in pairs. In differential mode, there are still four readings available. The readings, for each pair AB, are A-B and B-A. Whichever reading would be negative is set to zero. For more details about differential mode, and general characteristics of the ADC, please refer to the Texas Instruments datasheet for the TLV0834 ADC.

http://www.digchip.com/datasheets/pa...parts_tl41.php

[CNCAddict]

That looks like it's only analog...what you need is digital. I searched for 5 minutes and came up with this...jeez I wish I had found this sooner I'm looking for a price right now

http://www.a2v.fr/docs/see_ug_1102.pdf

Also, this is designed for an encoder signal..so it may not actually give a signal that doesn't match a valid quadrature output. In otherwords you may not be able to step one side at 100khz while the other stays high or low. The smoothstepper has an option for quadrature output instead of Step/Direction so this would work awesome setup as...

Computer->SmoothStepper->Breakout->Level Converter->ServoStar