AC centrifugal blower circuit

Hi,

Have got a couple of these AC 230v centrifugal EBM fans, and it comes with two different wiring diagrams.

Have got them running ok with the left hand diagram, but not 100% sure about the right hand diagram as the label is rather worn away.

Trying to find out what the actual layout and purpose of the right hand diagram is ?

The guy we got them from suggested it might be to run the fan in reverse ? though thought that type of fan only ran one way by design ??

The coils are ; Black to Grey 50R and Blue to Brown 72R

Could not find any info on the web or EBM /Papst site..

thanks.

Wp100 said:

The guy we got them from suggested it might be to run the fan in reverse ? though thought that type of fan only ran one way by design ??

Click to expand...

Correct. One direction only

It's possible that the alternate wiring might be for an alternate voltage or, perhaps, the addition of a starter capacitor ?

If it was a typical PSC motor, (it does show a capacitor), the windings are often identical, and can be reversed easily.
But there would be little (no) advantage in running a squirrel cage bladed fan backwards!
Max.