servo as spindle connected to mesa 7i96s db25

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16 Feb 2024 19:11 #293535 by jg00163206
hello all. I am in the process of building a small cnc milling machine (350x450x700mm-y,x,z) and im using a 1000w ac servo for a spindle motor. my question is; how do i configure the mesa 7i96s so i can control the servo through the db26 connector connected to the parallel port of the drive? i bought a db25 to parallel port connector that will plug right into the servo drive. i am new to linux cnc as this is my first build. i attached the manual for the drive. there is little to no info on this drive on the interweb but i would assume its not too different than any other drive of the same type. what is the 10vdc for, that a daughter card would provide? also, what is the difference between the 7i96s and the 7i96 as there is a ton of info on the 7i96 but very little info on the 7i96s card? i have two of these servos and plan on using the other one as a fourth axis in the future. for now, i am using nema 23 steppers to drive the x,y,z with cw5045 drives, but plan on upgrading to servos or a closed loop stepper system. what would be the best option for a daughter card for my application? my understanding, from reading the 7i96s manual, is the db25 pins can be configured in any way i see fit as they are fpga and have endless possibilities. i guess i can't upload the entire manual as it is too large, but here is the part number of the servo 80F-0330TBL-Z. thank you in advance for any info you can provide. please excuse my ignorance. i know im making this more complicated than it needs to be.

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16 Feb 2024 19:31 #293538 by PCW
Its very unlikely that the drives 25 pin connector  can be connected to the 7I96S in a useful way

The main difference between the 7I96 and 7I96S is the the 7I96S has an analog spindle interface
This (analog 0 to 10V interface) is probably the easiest way to interface to  you spindle drive

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17 Feb 2024 02:25 #293567 by jg00163206
so how would i connect my drive to take advantage of the 0 - 10v interface? do just connect it as i would a regular motion drive, or there anything i need to keep in mind when connecting it as a spindle?

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17 Feb 2024 04:13 #293571 by PCW
Can you post a link to the drive manual?

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17 Feb 2024 15:05 #293629 by jg00163206

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17 Feb 2024 16:04 #293632 by PCW
Since that's a full servo drive with step/dir control you can
use a spare step/dir  channel from the 7I96S to drive it.

Something like

7I96S Step4+ CN1 18 (PULS+)
7I96S Step4-  CN1 6 (PULS-)
7I96S Dir4+   CN1 19 (SIGN+)
7I96S DIR4-    CN1 7 (SIGN-)


I would also use one of the 7I96S SSR outputs to drive the
servo enable input

SSR5+ CN1 pin 21 (Servo Enable)
SSR5-  12/24V common negative
+12V/+24V CN1 8 (COM+)

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17 Feb 2024 21:00 #293648 by jg00163206
thank you for the quick reply and all your help. this site is amazing. i know this is a very noob question and forgive my ignorance, but what does common- and common+ mean?

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17 Feb 2024 21:07 #293650 by jg00163206
you're referring to the jumpers on the board?

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17 Feb 2024 21:30 #293655 by tommylight
COM = common = usually 0V on the power supply, although all over internet it is referred to as -V but this is wrong.
Read the 7i96S manual, outputs and inputs have common pins that can be 0V or +12-24V depending on use/wiring, so they can be used with any type of sensors, etc.
Do check this as it's been quite a while since i had a 7i96 without S.

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18 Feb 2024 16:53 #293689 by PCW
Yes, in this case "common" means the negative terminal of the +12/+24V supply
that has it positive output connected to the COM+ pin on the drive.

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