Dear Experts,

I have mm440 VFD having capacity of 2.2kw.Last night I faced problem of analog input voltage was dropping during run command.

In idle condition 10vdc coming on ANI1and ANI2 but when we connect potentiometer and check voltage we found only 6vdc.so we tried to replace potentiometer but problem is same.

my parameter setting for speed reference is 

P1080-0    ,P1082-50 ,  P2000-50.

Pls suggest me what is the problem with drive?????

Regards,

Pankaj Tiwari

Has this been resolved?

Tractor

No sir problem is not yet solved i have reseted drive to factory data set and again programmed it ,dip switch position is at off for 0-10vdc.Also i have linked terminal 2 and 4 and wire potentiometer but at idle condition 10vdc output coming but when drive state changed to run mode then analog output voltage got drop to 7vdc only so my drive run only on 37hz.

My reference frequency p2000-50Hz and maximum frequency is 50hz.

I think problem is with drive analog input circuit......

I thought the recommended potentiometer value was 4.7k?

Try connecting the 0/10 volt supply from the drive direct into the analogue input, without using the potentiometer, this will give full speed but would provide a test, check the analogue input for stability.

Also, test analogue input 2, in this way.

Tractor