The superimposed distance is defined by 75.40, and the velocity by 75.41. The
acceleration, deceleration and jerk rates are defined by 75.42, 75.43 and 75.44
respectively.
The status of the command is visible in bit 1 of 74.5.
￭
Phasing relative
This command shifts the actual master position by a given distance in a profiled
way. The source of the command is selected by 74.43.
The relative phasing distance is defined by 75.50, and the velocity by 75.51. The
acceleration, deceleration and jerk rates are defined by 75.52, 75.53 and 75.54
respectively.
The status of the command is visible in bit 3 of 74.5.
￭
Latching
Latching enables position monitoring or correction based on external events such
as proximity switches. The control program supports two configurable latching
sources which are activated by 74.45 and 74.46, or bits 5 and 6 of 75.62. Latch
activation status is shown by 86.52. is configured by 86.50 and 86.51. The latching
parameters are active only when homing is not active as homing has higher priority.
For more information on latching, see section Position latching (page 45).
￭
Virtual master
As an alternative to an external encoder, a virtual master can be selected by
parameter 87.11. Once selected, the virtual master can be operated using 74.47,
74.48, 74.49 and 74.50.
The virtual master is configured by parameters 87.50, 87.51, 87.52, 87.53 and 87.54.
The actual values of the virtual master are shown in 87.7 and 87.8.
Settings and diagnostics
Parameter groups: 20 Start/stop/direction (page 241), 74 Position status & control
words (page 440), 75 Position profile (page 450), 86.2 Actual position (page 463) and
87 Master position (page 472).
Actual position
Actual position is provided by the position feedback device selected by 86.13. The
source can be mounted on the motor shaft or on the load side. In addition, speed
feedback – typically received from the motor – is also used for the control.
ACS880 drives can have two different feedback devices for speed and position,
and various combinations are supported. See section Encoder support (page 84)
as well as FEN-xx interface module documentation for details.
38 Position control program features
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