I am making a brain to watch spindle rpm and e-stop if the feedback from the VFD is 0 while spindle led is on.

Problem.....When the spindle on command is given, at that point the spindle feedback is 0 for a split second so there is a failure.
Question.....How can I delay the reading of the feedback RPM after the spindle led in on so I can wait so many seconds for the spindle to be at speed, then start checking the RPM feedback to make sure the spindle actually came on?

I have tried for several hours to use a timer to delay the reading, my assumption is that you can't use timers to delay the reading.

Thanks in advance!

Jim

Maybe you could include the "Dwell Active" LED  in your brain as a condition.
Set the dwell in the spindle set-up for a second or two.
Just a guess.
RC

RC,

Great idea.....that should have worked.
But when I tired it there is a split second before the dwell takes active that the spindle is 0 rpm and throws a true.
So the brain runs thru too fast to see the dwell active.

Somehow I have to have time to get the spindle past 0 rpm before comparing that it is 0 rpm.  

Thanks for the idea!!

Jim