24V switch signal detection

Hi all

I have a PXI-1052 chassis with (among others) the following modules:

PXI-6289 with a block of connection SCB-68.

-Switch SCXI-1161 module.

What do I want?

I want to be able to spend the solenoid valves that operate on the 24 VDC.

With the SCXI-1161 module, I can move this solenoid but I want more!

I also want to detect if the solenoid really works (if there is a loop of 24 VDC or not).

My intention was to use the PXI-6289 with SCB-68 (or SCB-100) to detect this signal.

The problem.

I have the switching market part but I can't get work in loop control.

I'm testing with a 5V-10mA signal to see if I can get the job of 6289, but I don't seem to be able to create a stable signal.

The next step is whether the SCB-68 is able to manage 24Vdc.

Solution?

Yes please ;-)

With sincere friendships.

Jeroen Kluft

Okay it looks like a testbed for solenoids...

Here are a few patterns to drive a FET with a DO for your application, the first (left) looks good, IRF840 ago about 0.84 Ohm RDSon (most successful) and is good for the 5-8 a (cold!) and can go up to 500 v (DC) (how do you turn it off voltage surge?)  RC - Snubber or free running diode?) The FET has already a diode of implementation.

What measure? voltage current and supply to solenoid?  Accuracy required?

Analyze the current solenoid to reduce blood lights?   (you can detect the variation of the magnetic flux in the current flow to detect a non-acting solenoid (due to undervoltage)

And there are also SSRs (solid status relay) with galvanic, capable barrier for AC and DC, as well as some current LEM (also with galvanic isolation) sensors and industrial 'standard signal tranformers' (also with galvanic isolation), you can build a robust test bench, all controlled by your 6289...   for the 230VAC

Tags: NI Hardware

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