ESC Brushless MESA PWM 6i25+7i76

PCW
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08 Mar 2017 00:55 - 08 Mar 2017 00:56 #89185 by PCW

Replied by PCW on topic ESC Brushless MESA PWM 6i25+7i76

Hmm, looks like I made a custom bitfile for 7I76 with just one 1 PWM per card (where stepgen 4 usually goes)

freeby.mesanet.com/5i25_7i76x2_1P.bit

Last edit: 08 Mar 2017 00:56 by PCW.

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HalaszAttila
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09 Mar 2017 06:55 #89239 by HalaszAttila

Replied by HalaszAttila on topic ESC Brushless MESA PWM 6i25+7i76

I forgot to tell, i use 7i92 ethernet board with 7i76 card.

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andypugh
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09 Mar 2017 10:40 #89244 by andypugh

Replied by andypugh on topic ESC Brushless MESA PWM 6i25+7i76

You can probably run your ESC using a stepgen. You need to set it to velocity mode to get a fixed-frequency output to suit the ESC then alter the step-length to give the required pulse length.

However: The pulse-length is a HAL _parameter_ not a pin, so can't be directly connected in HAL. You would need to use (as an example) a custom M-code that issues a "halcmd setp hm2_7i92.0.stepgen.04.step-length NNN" command.

The following user(s) said Thank You: HalaszAttila

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HalaszAttila
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09 Mar 2017 18:36 #89278 by HalaszAttila

Replied by HalaszAttila on topic ESC Brushless MESA PWM 6i25+7i76

Thanks, I solved with this way. I use fix PWM duty cycle, because this is a braking mechanism for turret on lathe.

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