7i96 pncconf issue?

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16 Feb 2021 01:50 #199011 by Bearfood
Replied by Bearfood on topic 7i96 pncconf issue?
On Step1 I get the following to ground
Step+ 0.04v
Step- 4.4v
Dir + 0.04v
Dir - 4.4

On step 5 to ground (the step I can get working)
Step+ 4.5v
Step- 0.5v
Dir+ 4.5v
Dir- 0.5v

This is without linuxcnc running. The pc is on but the software isn't up to be clearer. Very odd how the voltages are reversed.

Step2 measures the same as step1

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16 Feb 2021 02:04 #199013 by PCW
Replied by PCW on topic 7i96 pncconf issue?
What does your 5V supply read at the 7I96?

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16 Feb 2021 04:19 - 16 Feb 2021 04:43 #199023 by Bearfood
Replied by Bearfood on topic 7i96 pncconf issue?
5.2v
Last edit: 16 Feb 2021 04:43 by Bearfood. Reason: Fat finger

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16 Feb 2021 16:31 #199083 by PCW
Replied by PCW on topic 7i96 pncconf issue?
Are those step/dir measurements with drives connected? (a load will make a difference)

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16 Feb 2021 18:41 #199095 by Bearfood
Replied by Bearfood on topic 7i96 pncconf issue?
I unplugged everything from the card except the 5v power

Step 1-4 I get the following to the ground for that step
S- = 4.4v
S+ = 0.001v
D- = 4.4v
D+ = 0.001v

Step5
S- = 0.0v
S+ = 5..18v
D- = 0.0v
D+ = 5.18v

I think I had my +/- step and directions backwards in my earlier post.

Power to the card = 5.2v
Attachments:

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16 Feb 2021 19:03 #199097 by PCW
Replied by PCW on topic 7i96 pncconf issue?
OK that does look like something is wrong with the first 4 channels on the
7I96, likely a problem with one of the driver chips. You should contact Mesa
by email and request a RMA number so the card can be returned and
evaluated/repaired/replaced

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16 Feb 2021 20:45 #199107 by Bearfood
Replied by Bearfood on topic 7i96 pncconf issue?
That's really unfortunate. I think shipping and duty cost me almost as much as the card. Thanks for your help!

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16 Feb 2021 21:15 #199109 by PCW
Replied by PCW on topic 7i96 pncconf issue?
Did you buy the card from a EU dealer? If so you should be able to
get a replacement from them.

One other thing to try is to just use the STEP-/DIR- pins

so

Drive Step+ <-- 5V
Drive Dir+ <-- +5V
Drive Step- <-- 7I96 Step-
Drive Dir- <-- 7I96 Dir-

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16 Feb 2021 23:10 #199114 by Bearfood
Replied by Bearfood on topic 7i96 pncconf issue?
Bought it from the US store.mesanet.com but I'm based in Canada which is where the duty comes into play.

so right now I have step-, step+,dir-, dir+ then the step and dir go to the phases on the drivers

You're saying wire 1 phase to the step- and Gnd and the second phase to dir- and 5v on the 7i96? this leaves no wires into the step+ and dir+.

I'll try that shortly and let you know.

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16 Feb 2021 23:16 - 16 Feb 2021 23:31 #199115 by PCW
Replied by PCW on topic 7i96 pncconf issue?
No, nothing is connected to GND

Wiring would be
Drive Step+ <-- +5V
Drive Dir+ <-- +5V
Drive Step- <-- 7I96 Step-
Drive Dir- <-- 7I96 Dir-

7I96 step+/dir+ pins left open

You would never connect 7I96 step or dir, + or - to ground or 5V
Last edit: 16 Feb 2021 23:31 by PCW.

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