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TMDSSOLARUINVKIT: C2000 Solar Inverter communication and current draw issues

Nicholas Barry
Prodigy 80 points

Part Number: TMDSSOLARUINVKIT

I am working with the TMDSSOLARUINVKIT and I have a few issues.  I am attempting to follow the instructions as provided in software section of the user guide.  However, when create the target configuration I do not see the connection option "TI XDS100v1 USB Emulator" as shown in the instructions.   I chose to use "TI XDS100v1 USB debug probe" assuming the language was just out of date.  After selecting this one, I completed the setup procedure without further complication.  

I am attempting to operate the inverter in grid tied mode with MPPT turned off.  I am confident the necessary modifications were made to the code to turn the MPPT off, this code was tested on other boards and worked correctly.    The problem is that as soon as the DC power supply is turned on, the device jumps to a 1A current draw.  I am concerned there may be a hardware short on the device causing a short circuit.  During this operation, the LD1 light is steady green, LD2 is out, and LD3 flashes read.  Looking at the watch window i see that the PV (DC) inputs are correctly reflected and match the power supply values.  However, the HV DC bus is almost at 0 volts.  If I use the PV inverter state bit to initialize the inverter, it kicks to a fault state.

It also appears as thought the CLA portion of the debug window is suspended or not connected during operation.  I am concerned about the communication between the computer and the board.  Does anyone have any advice on how to overcome these issues ?

  • 0
    TI__Genius 11895 points
    Are you using the actual grid, or an emulated grid? The user guide section 6.3.1 (Full PV Inverter System Check without MPPT) uses emulated grid (an AC source with 100 ohm load resistor in parallel). Please test this first with emulated grid and see whether the hardware is functional.

    Shamim
  • 0 in reply to Shamim Choudhury
    Prodigy 80 points

    Shamim,

    Emulated gird.  I followed the instructions exactly as laid out in the user guide section 6.3.1.  I was originally running  build 3 with the software that functions correctly on one board and reverted to build 1 in order to trouble shoot.  However, I run into this issue with the first build as well. 

  • 0 in reply to Nicholas Barry
    TI__Mastermind 43730 points
    Nicholas,

    From the description you have provided, it looks like you were able to run the board once, but now it is going into over current on the PV input side?

    This tells me there is some kind of damage to the board,

    I would take a multimeter and check for shorts,

    Make sure no HV supply is powered, if there is a short you will observe it without supplying voltage to PV input.
  • 0 in reply to Manish Bhardwaj
    Prodigy 80 points

    I am having a similar problem on a new board purchased in April of this year.  The board draws max current from the DC supply even when off.   A continuity check between the two DC input terminals fails (no completely short circuited).  The resistance is 11.5 ohms whereas the DC input resistance for the other boards that we have is 3.0 ohms.  There is no visible damage to the board.  I have other boards that successfully run the same code.