Hi...

Is it possible to use the PWM output to drive the gate on a IGBT module? 

PLC: 1212C V4

IGBT: FGH50N6S2D

As per datasheet for the igbt I can see that it requires approx. 15vdc to power the gate. To get the 15volts I used a voltage divider (68K ohm and 44k ohm)

But it seems that its not working correct.

I am pretty sure that the PWM function is working correct.

Give me your thoughts about this thanks :-)

No idea what gate current you need, but I would be going through an isolator first before I blow up my PLC wen it gets hit by 380V.

What are you specifically trying to accomplish?  You would probably be better off with a microcontroller like an Arduino or a PICT if you want to do a phase controller or something.

I think that the gate is isolated within the igbt??  

I need to switch 200vdc to a large eddy current brake. 

I have tested the pwm output with oscilloscope and it works fine without anything connected but when I try to raise the frequency above 100hz the output stops, do you have any idea why that is?? 

Gybsen

I think that the gate is isolated within the igbt??  

 No, your IGBT turns on with the voltage between Gate and Emitter.  So, unless you are tying your PLC M to your 200V M (totally NOT advisable), then you need an isolator.

Search for some IGBT gate driver circuits.