NI 6514 output configuration

[Bublina]

Hello,

Please help me investigate a probable wiring error for outputs on PCI 6514.

I have this card and it´s outputs wired into 24V control circuit of relays, that control actuators.

The problem is, that the card works (everything looks normal), but after some time (last time it was 1 year).

The card is operating about 10 hours a day.

The same integrated component on the PCI card blows up. The component is A2982ELW-T (datasheet attached), it is an eight channel source driver. Unfortunately, I do not have the wiring schema, becouse it was done by other company.

The 6514 Card schema (from 651x manual).

The A2982ELW-T circuit is, from what i think, the part in schema described as "x8 Outputs per Port"

The weird thing is, that this is the second time it happened, this indicates a malfunctioning relay or inproper wiring.

Here is the picture of the damaged card. The device, that causes the overload is connected to the P5 output bank (that corresponds to the blown source driver). The devices connected to this port should have no more than 50mA current consumption (24V).

If you have any suggestions or experience with relays, that could cause this, I would be very thankfull.

[Ardent]

Hi Bublina,

have you considered sending the card for factory test or repair at a NI plant (considering the price of the card, even buying new one might be an option...)?

I can hardly comment on a wiring problem in the PCI, since this is probably more for the people in production.

Have a great day for now!

[Bublina]

Thank your for reply,

We ordered @ bought new one immidietly, I am just trying to solve the root of the problem.

The problem is not the PCI card, but the peripheral circuits wired to it.

[Ardent]

Hi Bublina,

I checked what might be the reason for the IC you mentioned to burn out. Basically it could either be shorting out the output or overloading it (either electrically or thermally).

The 6514 should be able to handle 350 mA for one channel, and 75 mA for all of the channels, so the 50 mA shouldn't be an issue.

Sorry, but I doubt I (or anyone else) will be able to help you with this one without any information on the appended circuitry.

[Ardent]

You might be also interested in this KnowledgeBase article.

[Bublina]

That knowledgebase helps, thank you.