7I30 Quad H-bridges. I did wrong by my mesa card

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11 May 2022 22:08 #242682 by HeronG
I supose PCW might kill the subject, but if he dos not show himself lets turn this into a vote on what I should replace first.

Events:
So, one of the motor channels on my 7i30 stopped working after a motor runway event, it was not a particular fast, nor very long and not even the first. The other channels seam unafected.

Settings:
The motor is a "small" 5 axis on a wire EDM machine, the board is fead 24V (power supply very close), fast decay, 3A. Signals used are Enable, Direction and PWM.

I need all 4 channels for minor things on the machine. The main ICs are A3959SLBT the other small one near the control signal I failed to see the name. Nothing looks visualy damaged. The other channels work fine.

If you guys have any idea on what should be replaced firts or tests to be performed I am open to sugentions.
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12 May 2022 01:21 #242700 by PCW
Most likely the A3959 as that is the HBridge chip.
(the other chips are 4 74HCT14s and a small 3.3v voltage regulator)
The following user(s) said Thank You: HeronG

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31 May 2022 19:55 #244309 by HeronG
The ic just arrived. I changed and “boom”, it works again. I decreased the voltage from 24 to 17 and added a cap on the input. Any other suggestion to try in preventing future problems?

Thanks again Peter

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31 May 2022 20:08 #244310 by PCW
A 28V TVS diode across the 24V would probably help also
Say a 5KP28A

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31 May 2022 20:12 #244311 by billykid
I use a 7i30 for a small plasma, for safety I preferred to power 30 volts but leave the limiter at 1 amp. then as the manual says a nice capacitor on motor power, I had no problems.

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