"DeusEx"

[mocha]

Thanks m_c, just had a read through that post from marriss, seems like there might well be another g540 in the pipeline? If I'm right that the G540 has 4x g250 or G251 in it(?) the New G215 might just drop in! I noted too that there is at least two versions of it;

"recent mods to the sense lines and the new trim pot location"

either way, if the new ones come out at the end of September, it might drop the price of the "old stock"enough to get me in the game!

Not sure how most of it affects my type of home brew machine. I can't think of a way I could use it other than Arduinocnc??? lol

Here's the post in question for those with an interest;
quote

First off, in our future new products we leaving CPLDs behind and be will using FPGAs instead. For the non-technical types, CPLDs and FPGAs are programmable ICs that replace a boatload of discrete logic such as gates, counters, decoders and such which are necessary to build motor drives.

The difference between CPLDs and FPGAs is the size of the 'boatload'. A CPLD replaces about 20 discrete 7400 logic series ICs while an FPGA replaces over 200. Think of it as moving from a 500 square-foot studio apartment to a 5,000 square-foot luxury home.

That's what it feels like to an engineer; all the stuff that wouldn't fit in the apartment now fits in the home plus lot more things you'd always wanted to get. It's like you died and went to heaven.

The G215 is a step motor drive. It's like the G203 (lot's of protection circuitry), like the G201X (DIP-switch settable features) and like a G901X (a can't be fooled step pulse multiplier). All the goodness of the best of our drives all rolled into one.

That uses up only 1/3 of an FPGA.

The G215 has a MODE switch on it's internal 10-position DIP switch. When 'OFF', it's an ordinary step motor drive. When switched 'ON', it changes personality.

It becomes a motion controller with its own built-in step pulse generator. The STEP input becomes a CW limit switch input and the DIRECTION input becomes a CCW limit switch. Two trimpots set independent CW and CCW motor speeds. The DISABLE input becomes a RUN/STOP command. Another trimpot sets the accelerate/decelerate rate. It now performs the most common industrial applications for step motors; run between two limit switches at two different digitally set speeds with the option of stopping and restarting motor motion between the limit switches. The FAULT output indicates when the motor actually stops after deceleration. All motion is digitally generated with digital accuracy.

This uses up another 1/3 of the FPGA.

The remaining 1/3 of the FPGA is used for several purposes:

1) In a perfect world, step motors would be perfect and need only sine and cosine currents to move them. In the real world, step motors have non-linear characteristics which requires a compensating distortion of the sine and cosine currents that drive them.

You may have noticed this if you use step motors optimized for high holding torque. They have pronounced vibration at low speeds even when driven with perfect sine-cosine drives.

These motors need to be driven with a drive that has a compensating distortion of its current profile.

Now imagine a drive that has a family of 8 current profiles stored in it ranging from undistorted to significantly distorted. The profiles are arranged in FLASH memory in the G215 in order. The best profile for your motor is selected by turning a trimpot; you turn the trimpot until your motor vibration goes away. Again, all digital. The trimpot goes to an Analog to Digital converter that selects the best profile of your choice.

2) There is a whole bunch of reasons why a drive might not work.

A miss-wired motor, a motor winding that isn't connected, a short circuit, bad STEP and DIRECTION input signal quality or polarity, insufficient or excessive power supply voltage, drive overheating, etc and etc.

Our existing protected drives light up a FAULT indicator for some of these problems or give no indication at all for others.

The G215 will use a 16 error 'blink code' to identify why your motor isn't running. The G215 has two LEDs; a red and a green one. If everything is OK, the green LED will be a solid green.

If there is a problem like motor winding 'A' not connected, the LEDs will blink 'RED, RED, RED, GREEN, pause, RED, RED, RED, GREEN' pause, and so on. The code for that sequence will be listed in the manual as "Winding 'A' not connected". This will make trouble-shooting much easier.

The G215 will become available in late September. It will be the first of our new line of FPGA drives. Many other new products will follow in the next 6 moths based on this switch to FPGA logic drives.

Cost? Equal to or less than our current drives. Why? because so much functionality now moves inside the FPGA and no longer requires external analog circuitry.
end quote

[Jonathan]

To save everyone finding the relevant thread:
http://www.cnczone.com/forums/gecko_...215_drive.html

Interesting that he makes using an FPGA sound like it's something special/unique to use, or at least that's how it reads to me. PM752, and no doubt many others in the range, also use FPGAs as it's just easier. I'd use one if I thought I had a chance of soldering BGA's!

The original comparison was 540 vs 2M880N - there the latter surely wins due to the better control algorithm and ratings. 2M880N vs 203V is less clear cut ... until I see a fair test done between the two I would go for the 2M880N as it seems to still have the better control algorithm, and it's cheaper? (Correct me if I'm wrong, not sure how much the 203V is?). I'd happily do the comparison properly, i.e. at different feedrates and accelaration with a few different motors plus record waveforms with oscilloscope, but currently I own neither drive.

Yes maybe you should have because I have 3 PM752's sat on a shelf

Are they for sale :naughty:?

[JAZZCNC]

Interesting that he makes using an FPGA sound like it's something special/unique to use, or at least that's how it reads to me. PM752, and no doubt many others in the range, also use FPGAs as it's just easier.

First Jonathan I wouldn't even start down the road of trying to discredit what Marriss fremarnis say's, you'll make your self look pritty silly.! . . He's probably forgot more than you'll ever know lad.!

Are they for sale :naughty:?

Nope I use them for testing motors and setting up machines.!

[Jonathan]

First Jonathan I wouldn't even start down the road of trying to discredit what Marriss fremarnis say's, you'll make your self look pritty silly.! . .

I wasn't intending to discredit him - only point out that I didn't like the style of the first part of that post. Can't fault the content.

He's probably forgot more than you'll ever know lad.!

When I'm his age hopefully that won't be true...

[JAZZCNC]

When I'm his age hopefully that won't be true...

Yes and I wouldn't bet against it Jonathan but unfortunatly today and for a good while yet you don't so I wouldn't go there.!! . . . . . Now give me a hug and lets play nice. .:rofl:

[JAZZCNC]

You have to admire Marriss for the both way he's so transparent and gives clear no bull shit information and how he runs his business.
How meny large company directors would take the time to post and directly chat on a forum.? . . Not too meny mi thinks.!!

The warranty and service Gecko gives is unrivelled in my experience, even if it's your own stupid fault you've fry'd the drive (Which it often is) I've seen them replace units FOC. . . . Now thats service.!! . . . .Try that with a chinese manufacturer or even UK distributor and watch them :lol: you out the door.:exclaim: