Parker AC890 Product Manual page 328

Parameter Descriptions
PREF: 71.03 Default: FALSE Range: FALSE/TRUE
ENCODER INVERT
Used to match the encoder direction to the motor direction. The encoder direction is set automatically by the Autotune when
running in closed-loop vector mode. It should not be necessary to adjust this parameter. When TRUE, changes the sign of the
measured speed and the direction of the position count.
Caution: if it is found necessary to invert the encoder direction, this may be because the encoder wiring is incorrect. This
should be checked first. If an absolute endat encoder is used, the encoder MUST be wired exactly as specified. If not, it will
fail to calibrate the absolute position and an error will result when the drive is started. Its status can be viewed via the
parameter CALIBRATN STATUS.
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890SD Standalone Drive - Frames G, H & J Page