Position Compare

The AKD Position Compare feature allows the drive's digital outputs to be turned on or off depending on one or more feedback positions. The AKD supports two independent compare engines (CMP0, CMP1).

Configuring Position Compare

Select Compare Engines under Settings in the WorkBench navigation tree. This view shows an overview of the two compare engines. Use this view to set each engine's compare source, output, phase advance, and modulo settings.

Setting Compare Sources (CMPx.SOURCE)

Compare setpoints are compared against compare sources. If they match, an output pulse is generated. Use CMP0.SOURCE and CMP1.SOURCE to select the source which the compare setpoints will be compared against.

Select one of the following compare source values:

Value	Description
0	Triggers output based on a compare with the primary feedback position (FB1.P ), independent of the value of PL.FBSOURCE . The units of the primary feedback are determined by FB1.PUNIT .
1	Triggers output based on a compare with the secondary feedback position (FB2.P ), independent of the value of PL.FBSOURCE. The units of the secondary feedback are determined by FB2.PUNIT .
2	Triggers output based on a compare with the tertiary feedback position (FB3.P), independent of the value of PL.FBSOURCE. The units of the tertiary feedback are determined by FB3.PUNIT .
3	Triggers output based on the position of PL.FB . The units of the position feedback are determined by UNIT.PROTARY (➜ p. 1) or UNIT.PLINEAR (➜ p. 1).

Setting Compare Setpoints (CMPx.SETPOINT)

Each compare engine has eight independent setpoints that can trigger output pulses with widths in either position or time. Use a compare engine's view to set each setpointSetpoint is the target value that an automatic control system, for example PID controller, will aim to reach's value, width, width-type, mode, and to arm each setpoint.