Quad Cnts/Rev

Default: 1
Range: -32768 to 32767

This parameter is available on stepper axes only. It is used with the Pos Units/Rev parameter to determine the scaling between position units and quadrature counts. If the quadrature feedback is not being used, enter a zero for this parameter. This will make the Actual Position always match the Target Position, therefore eliminating the Following Error.

The sign of this parameter determines whether increasing quadrature counts (phase A leading phase B) translates to increasing or decreasing the current position:

Sign	Increasing quadrature counts means…
+	…increasing positions
-	…decreasing positions

The use of this parameter is summarized by the following equation, which is applied every control loop to convert the incoming quadrature counts to an Actual Position in user-defined position units.

$image\ebx_1821210426.gif$

As the name implies, the recommended value to enter in this parameter is the number of quadrature counts generated in a single revolution of the motor. Therefore, for a 1000-line encoder mounted on the same shaft as the motor, you would enter 4000 in this parameter since there are 4000 quadrature counts per revolution on a 1000-line encoder. However, this becomes more complicated if the quadrature feedback is on another shaft that is mechanically geared to the motor shaft with a ratio other than 1:1. For a full discussion, including examples, on scaling with stepper modules, see Stepper Scaling.