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Original question:

MSP430I2041: Calibration

MSP430F67791A: Energy Measurement DC

Bilal.m.Ahmad
Intellectual 340 points

Part Number: MSP430F67791A

Hi, Im trying build multiple energy measurements for 1 phase. I have made a copy of 3 phase design and removed 2 voltage point. idally id like you 5 current 

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  • 0
    TI__Intellectual 1680 points

    Hi Bilal,

    Apologies, what is your question here?

    Thanks,

    -Eric Rentschler

  • 0 in reply to Eric Rentschler
    Intellectual 340 points

    Apologies for the confusion in my previous question.

    I am trying to configure an energy measurement device with one voltage channel and three or more current channels, where all current measurements use the same voltage reference.

    My intended configuration is:

    • 1 × Voltage channel
    • 3 or more × Current channels
    • All current channels measured against the same voltage channel

    Is this configuration supported by EMDC?

    To test this, I made a copy of the provided 3-phase EMDC example and removed two of the voltage channels, leaving one voltage channel and three current channels.

    The project builds and deploys to the device, but after programming, the device communicates with EMDC for only a few seconds and then stops responding.

    Is there a specific way that EMDC needs to be configured for one shared voltage channel with multiple current channels? Or does EMDC require a separate voltage channel for each current channel/phase?

    Any guidance on the correct configuration would be appreciated.

  • 0 in reply to Bilal.m.Ahmad
    TI__Mastermind 27240 points

    Hi Bilal,

    The configuration should be supported. I see you have them all listed as Phase A, I would recommend having them different phase names (A-F is supported). You may run into bandwidth issues so lowering the clock can help. If you scope the UART lines, you should see if there's any communication issues. Even if you don't know the protocol, you can see the call and response between GUI and device.

    Make sure you click the error status button above Generate code, to validate you have an appropriate configuration.

    Regards,
    Luke

  • 0 in reply to Luke Ledbetter
    Intellectual 340 points

    Thanks for the clarification.

    I did try configuring the current channels with different phase names. The project deployed successfully, but communication with the device stopped after a few seconds, so I wasn't able to test the system properly.

    I will try lowering the SMCLK frequency as you suggested.

    For testing, I have also simplified the configuration to just one voltage sensor and two current sensors. I am using the EMDC GUI for calibration and testing, but even with this simpler setup the GUI communication is very jittery and eventually stops, using the same SMCLK frequency.

    I will also check the UART lines with a scope and verify the configuration using the Error Status button before generating the code.