Yaskawa SGDB to 7i77 - drives don't have the 'standard ' 50 pin connectors

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20 Sep 2019 01:48 #145643 by SPH
Oh, no doubt they’ll be fine. I’ve not really had any issues with Chinese stuff till now, apart from some far too cheap stepper drives.

My main issue is all the extra mechanical work getting the motor to fit. Most of the motors I’ve seen for sale aren’t the massive frame size that’s fitted to the x axis. I think it’s 200mm square or there about. Not sure what nema size it is.
It’d be doable, certainly.

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20 Sep 2019 03:15 #145646 by SPH
Oh, I get your point too about the price, that’s much better than I’d expected.
How are those drives to setup? Can I use the 7i77 to control them?

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21 Sep 2019 02:24 #145729 by bevins

SPH wrote: Oh, I get your point too about the price, that’s much better than I’d expected.
How are those drives to setup? Can I use the 7i77 to control them?


They are not easy but with some work they get done.
I have a spreadsheet of parameters that need to be changed and such.

They are +-10 or step and direction. 7i77 will work with +-10 velocity control.
The following user(s) said Thank You: SPH

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21 Sep 2019 02:35 #145730 by SPH
Just dropped $2k on three motors. The X axis motor drives a gearbox and was rated at 10nm so I sprung for the correct frame size and RPM in the china servos. Should be a direct (or close too) swap now. 3kw and rated at something like 19nm but it was the cheapest 180mm frame motor.
Other two are the same size, Nm rating and RPM as original so should work well.

Hopefully I can recoup some of the cost off loading the old motors and drives. The Mechatrolink drives sell for peanuts but the drives might bring a bit.

As I ended up spending a fair bit more than I'd planned on the axis motors I didn't bother with a motor for the tool changer. I'll either run a fixed tool change setup or maybe use a stepper that I've got lying around for the rotary.

Thanks for all the help guys, I literally couldn't do it without you.

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05 Oct 2019 12:35 #147193 by SPH
My motors turned up yesterday. All looks pretty good the motors themselves look on par with the yaskawa motors. Drives look cheap but that’s pretty standard.

Bevins, if you’ve got that spreadsheet of drive parameters I’d love to get a copy. Any ‘need to know’ pointers would be appreciated too.

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