Problems VeriStand 2011 RT and SCXI-1540

Good afternoon

As in the topic, we have problems with our card module SCXI-1540 that we use to acquire a mixed selection of RVDT and resolvers.

Specifically, we have our facility on Veristand 2011 on a target of RT who has a device custom control map SCXI chassis PXI-1050 and the NI PXI-6221 card, everything is fine but every now and then the map 1540 suddenly start showing a rolling measure of angle for resolution programs.

By checking with an oscilloscope, resolvers entries are good, but we notice that when the event occurs, the excitement somehow pass set 5 kHz to 10 kHz and even by the cancellation of the deployment and redeploy the project and verify that the property node DAQmx channel used to set the frequency of excitation is the correct setting of 5 kHz and does not return an error There is no way to get the channel back to 5 kHz, and it remains stuck at 10 kHz. The only way to be able to control the frequency of excitation again is through a power cycle of the RT/chassis.

We checked also by adding debug code in the custom feature event is the channel of sin or cos channel starts showing a rolling measure voltage so our measure of angle begins to roll too.

So far, this behaviour seems to have manifested only with programs of resolution that we mainly tested those and synchronize us excitement between a sin / cos pair.

Please notify

I just noticed that I never gave a solution for this.

The problem was current flyback to another causing system glitches of EMI on the lines of resolvers somehow mess with map of 1540, which essentially stopped decoding of the resoulvers of entry correctly, I added a Reset custom device close the file and that fixed the not being able to get out of the excitement of 10 Khz on the redeployment. However the final fix was adding flyback diodes to the tokill power system high seeds. So beware of your configuration as module SCXI-1540 cards seems to be sensitive to such events.

Tags: NI Products

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