load cell scc-sg24

[justapro]

I have a load cell that outputs 1-10 mV. I have connected it straight into the SC-2345/2350 and I have observed the raw signal. I have a SCC-SG24 block and I am trying to run the signal through this.  I have searched through manuals and this forum and I cannot seem to find BASIC setup information for this. All I want to know is:

1. Exactly where to I hook up this load cell signal into the SCC-SG24?

2. Do I need to apply external power to the SCC-SG24? Or does it give me the gain and signal conditioning without external power?

3. How do I configure LabView to read this signal?

I am a LabView newbie. I was good enough to read the signal straight into the board but I cannot get it through the block. BASIC information would be very much appreciated!

[Conseils]

Well hooking it up should be striaght forward as long as you know what the connections to the load cell are and are sure about the type of load cell which sould be at least a 350 Ohm full bridge configuration.

If you use terminals 5 and 6 on the picture below, the channel will depend on where you plug the unit in the SCC carrier module; the channel numbers are clearly marked on the mother board of the SCC carrier module.

If this isn't clear enough then check out the two documents that I have provided links for, these should clarify things nicely.

Its easiest to check operation using NI-MAX test panel, then you can find one of the sample programs / examples that reads in an analogue voltage and set it to read the analogue channel you have plugged the conditioner into.

For a maximum of 10mv in the unit will give reading of 1v in NI-MAX.




Picture
http://sine.ni.com/images/products/us/scc_sg24_030709_l.jpg
Manual SCC module
http://www.ni.com/pdf/manuals/371073b.pdf
Quick Start Manual SCC Carrier Module
http://www.ni.com/pdf/manuals/373743c.pdf

Message Edited by Conseils on 05-19-2007 07:09 PM

Message Edited by Conseils on 05-19-2007 07:12 PM

Message Edited by Conseils on 05-19-2007 07:14 PM

[Conseils]

Here is a picture of how to connect it all up....

Message Edited by Conseils on 05-19-2007 07:20 PM

[justapro]

Thanks Conseils,  I will look at this again on Monday. I think I have it setup correctly (I have the signals going into 5 and 6) but I cannot seem to get anything on the MAX.

[Conseils]

When you say you can't see anything ... What were you expecting to see.
If the guage is in balance and there is no load then you would have 0v ideally.

[justapro]

I know the load cell is putting out voltage...I can jump on the scale and read it with a multimeter (around 2-3 mV). But I am not seeing this with my SCC-SG24.

[Conseils]

Yes if you have it hooked up you should see something if NI-MAX is configured in continous mode.
I often use a physical stimulus and monitor the trace to confirm basic functionality in this fashion.

Have you checked the configuration (NI MAX) of the accessory channel to ensure that the correct module is selected on the correct chanel and mode. Could also be some problem with the wiring / gauge or the channel that you think you are connected to. You meter will of course confirm that the change is getting to the inputs of the signal conditioning module. So after you have confirmed this you can bash around with the configuration in NI-MAX to get it correct.

[justapro]

Conseils (or anyone else),

     I noticed that wiring diagam is hooked to ground and to external power. Is this done inside the board? All I have hooked up is the signals in 5 and 6. I don't have anything else attached to the SCC-SG24. Is this correct?

[justapro]

Ok...I got it. I didn't  conect a jumper on the SCC-68. That's why I was not getting any signal.

Thanks for your help!