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  1. #1
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    Three Phase Pump controller_AN 984a

    Hi,

    I am working with three phase pump controller, with AN984a, dspic33fj12MC202, working very fine and delivering out put of 240AC phase to phase at 60Hz, Now I need to have 380AV or 415 AC phase to phase at 50Hz, and I am in need of support

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    Re: Three Phase Pump controller_AN 984a

    Hi,

    What´s exactly the problem?
    * Increasing the power V_Bus voltage? --> show your power stage
    * decreasing the frequency? --> explained in the AN

    Klaus
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    Re: Three Phase Pump controller_AN 984a

    To achieve 400 VAC phase-to-phase output voltage, you also need 400 VAC input and a power stage designed for 560 V DC link.



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    Re: Three Phase Pump controller_AN 984a

    hi

    Thank you, Even though bus bar voltage is 450V DC, corresponding output voltage is 240V AC at 60 Hz, I need at least 350V AC as out put phase to phase, what shall I do either in code or in the hard were

    - - - Updated - - -

    Hi,

    I have checked even on 550V DC link but out put is 240V AC phase to phase, by varying the AN3 ratiometrically V & F changes max 240VAC at 60 Hz



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    Re: Three Phase Pump controller_AN 984a

    Hi,

    I dont see the problem.
    Even though bus bar voltage is 450V DC, corresponding output voltage is 240V AC at 60 Hz,
    Why? How do you come to this conclusion?

    --> Show what you have done so far and how you calculated the value.

    Klaus
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  6. #6
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    Re: Three Phase Pump controller_AN 984a

    Obviously, the voltage limitation is a problem of your software. You need to understand how the modulation index is calculated therein.



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