#DO card NI - 6512 darlington driver IC A2982SLWT got damaged

[Pashya5040]

Hi everyone,

While testing application with NI - 6512 DO card, Diver IC A2982SLWT for first Bank(P0) got damaged(Burned). So after that i had checked wiring but i didn't found anything wrong with the wiring.

I have attached file for understanding exact problem.

Please have a look and hope for instant reply.

[Pashya5040]

I'm awaiting your response!!

NI DO card has total 8 bank and i think each one has over-current/ Thermal shutdown protection on board, but still problem occurred. So request to NI expert, Please look into the matter. Expected better support from NI.

Thanks,

Prashant

[Asil_1]

Hello, i have the same problem. Do you know what is the root cause of burned ic? 

[santo_13]

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@Asil_1 wrote:

Hello, i have the same problem. Do you know what is the root cause of burned ic? 

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what is connected to the DO? and how exactly are those powered?

[Asil_1]

Outputs are selenoid valves. I guess powered by NI6512. I checked all wiring there is no short or something.

[santo_13]

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@Asil_1 wrote:

Outputs are selenoid valves. I guess powered by NI6512. I checked all wiring there is no short or something.

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Do you use a freewheeling diode to avoid damage from back emf?

[Asil_1]

there are flyback diodes on the coil of these valves. I checked them no problem. Maybe there was short somewhere, somehow happened. But it did not happen again. Thank you for your help.