Three Phase Pump controller_AN 984a

[vir_paksh@yahoo.co.in]

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

 

[KlausST]

Hi,

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

Klaus

 

[FvM]

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.

 

[vir_paksh@yahoo.co.in]

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

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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

 

[KlausST]

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

 

[FvM]

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