I have MICROMASTER VFD 430 (6SE6430-2AD31-8DA0) the problem is the fan working pulsating(fan working for 3 sec and stop 10 sec) during the VFD not working,Please what the reason for this and what is the solution.

Which fan you are talking about?

Inverter cooling fan or VFD installed for fan application? If it fan application, is the fan balanced? Does it has external brake? Please check.

ARLS

I have MICROMASTER VFD 430 (6SE6430-2AD31-8DA0) the problem is the fan working pulsating(fan working for 3 sec and stop 10 sec) during the VFD not working,Please what the reason for this and what is the solution.

 Hello

 it's related of your previous problem?

 https://support.industry.siemens.com/tf/ww/en/posts/156566/

Dear Sir, 

Thanks for your reply, I mean coaling fan for VFD.and I didn;t found answer for this.

I guess you already check the fan itself, right?

What about the inverter enable signal?

Let us know,

Regards.