Servo Motor Shaft Encoder Douts

[raman00084]

in my panasonic servo motor there are three encoder outputs namely A , B , Z, If i connect cro i am getting square wave in a and b terminals but only noise in z. please explain about A B Z TERMINALS why i am not getting output in z?

 

[Miralipoor]

The sign of phase difference between A,B indicate turning in clockwise or vise versa.You must see a pulse in Z every one round.If there is noise may your Z have not a pull up resistor.