CZ-A servos, who knows?

My old x,y bosch sm5/10-tc servos are now retired. I'm looking to replace them by this (1kw version) and, of course, continuing use 7i77: 

vallder.com/en/c/ac-servox/cz-a1023l-ams...025-detail#downloads

Does any one have tried this servos? My doubt is about analog control schematic (page 15 this manual):

vallder.com/images/product_details_image.../driver%20manual.pdf


 

Hi,
I was looking for some feedback from who used this cz-a servos. Looking in the web but poor information...

I think that these and similar ASSD drivers (my choice) can work with the factory settings only with their own encoder, if you disconnect it, an error will appear in driver state. In the case of the 7i77, which requires an encoder, you should probably have another encoder connected to the axis so that the 7i77 gives analog output.. seems quite confusing, with some step/dir card like 7i96s I think it would be much simpler.

valder currently has no servo motors in stock. At least that's how it is in Serbia

Masiwood123 wrote:

I think that these and similar ASSD drivers (my choice) can work with the factory settings only with their own encoder, if you disconnect it, an error will appear in driver state. In the case of the 7i77, which requires an encoder, you should probably have another encoder connected to the axis so that the 7i77 gives analog output.. seems quite confusing, with some step/dir card like 7i96s I think it would be much simpler.

You don't disconnect the encoder from the drive, you connect the drive's encoder out signals (on CN1) to the Mesa card. But yes, step/dir control can be simpler connection-wise (one less cable per drive) if you don't want/need feedback of actual position to LinuxCNC.

(You *can* also use a fully closed position loop where you have, say, a linear encoder on the machine that feedbacks position to LinuxCNC, while the drive controls velocity using the motor encoder. IMO in most cases it's probably both easier and better to use high precision, preloaded, linear components instead though.)

as I understood, does this mean that the motor's own encoder should be connected in both directions(from CN1), both to the driver and to the 7i77?

No, the motor encoder connects to CN2. Look at page 13 of the manual linked in a previous post.

yes ok , it confused me because my driver is different (cn3 is the encoder for the motor and cn 2 is the I/O port on the driver) thank you