Yet another MESA question!

Hello,

I have been looking at the 7I40 HV for some time, the brush DC drives currently in my possession require 60 VDC tachos for feed back and there is no way I'm gong to find those for the tiny little motors I'm using!

I currently have a 5I25 and 7I77 and would use 3 of the 4 available amplifiers from a pair of 7I40 HV as dual loop drive for 3 axis with the 6 channels from the 7I77 (3x for internal PWM command and feedback and 3x for the external feedback loop with linear encoders - all tied together in the HAL). In the future if a 4th axis was needed I would either get another 5I25+7I77 pair or potentially go with a different anything I/O solution and use steppers, most likely I will want a 4th rotary axis and tool changer someday.

Anybody done this? The 7I40 HV looks like a fairly priced + capable driver card, I just wouldn't be using the PC 105 form factor so I would have to cook up a few custom cables to utilize the 50 pin headers on the 7I40 HV.

Any encouragement, discouragement or arm twisting would be appreciated. Just looking for a sanity check before I pull the trigger.

Thank you.

Disregard, the 7I77 has -10 to 10 analog (per channel) for speed and direction and the 7I40 HV takes PWM and a discrete input for direction...

I'll keep looking.

Isn't a 7i90 significantly cheaper than a 5i24? Or is there a reason it wouldn't be a good choice?

The Ethernet 7I93 is also a option if 2x 50 pin connectors are sufficient

Hello again,

Thank you for all of the replies! I think the 7I93 looks interesting and with the 2x 7I40 HVs looks to fit my requirements and budget. I'll use the 5i25 and 7i77 I already have for the extra linear axis encoder inputs as well as my spindle, tool changer, GPIO, etc. Hopefully bringing the rotary and linear feedback of each axis through separate HW into the HAL won't cause too many headaches.

Thank you again!