A drive- or return pulley not installed squarely pushes the belt to the side which has shortest distance to a line square to the longitudinal line of conveyor.
Forces acting on the belt are illustrated as arrows. Belt tension is higher on the left side and pushes belt to the right side to equalize.
Be aware that the belt is elongated when turning around pulley. An abrasion takes place and pulley will be concave. Pulley will eventually be cut in two. The pulley must be firmly mounted in the frame. Otherwise belt will move to and from. Wear down steel and create a concave surface that will make belt run unstable.
OBSERVE! The PrimeTracker sets the position of belt where it is located. Is pulley not square belt will misalign.
Compare the angle of wrap between pulley and tracker. Power of pulley is much higher than tracker due to minor belt wrap.
Same Phenomenon will occur when pulley has plack build up. A tracker will have problems in such case.
Tracker takes information from the area it is installed and steer the belt squarely. When belt is forced to misalign by pulley, the tracker has not the power to correct running mood. S ide stiffness and angle of wrap between pulley and tracker decide running quality.
This is why pulleys must be installed squarely and free of build up plack.