over current protection in 3 phase inverter

K

Thread Starter

kirkpong

Dear sir
I build inverter 3 phase at 220Vac input to drive 3phase induction motor. It is O.K. But now, I want to detect over current case in my
inverter. How can I do?
Because I found many noise in my circuit?????????
 
H

Hakan Ozevin

All of the inverters have a digital output for overcurrent. Most of them are parameterizable with the desired ampere level.
Noise will not affect it, because inverter measure it as true rms.
 
A

Alex Ruderman

> I build inverter 3 phase at 220Vac input to
> drive 3phase induction motor. It is O.K. But
> now, I want to detect over current case in my
> inverter. How can I do?

Typically, inverter (servo amp) power stages are protected against phase-to-phase, phase-to-ground and phase-to-DC shorts. The comprehensive
isolated protection requires 2 current sensing inductors (transformers) - let me know your e-mail address and I will send you schematics details.

-Alex
[email protected]
 
F

Fiilip Atanassov

Hi, did you find a solution? I am building the same invertor and I'm fighting with the noise too.

Thanks,
Filip
 
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