
Function overview
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5.3
Positioning control
5.3.1
Overview
In the positioning mode, a certain position is specified. This position is to be approached by the motor. The current position is
determined based on the information that is provided by the internal encoder evaluation. The position deviation is processed in
the position controller and passed on to the speed controller.
The integrated positioning control allows jerk-limited or time-optimal positioning, either relative or absolute with regard to a
reference point. It provides setpoints to the position controller and - to improve the dynamics - also to the speed controller.
In the case of absolute positioning, a specified target position is directly approached. In the case of relative positioning, the
system moves over the parameterised distance. The positioning range of 2
32
full revolutions enables any number of relative
positioning movements in one direction.
The positioning control is parameterised by way of a target table. The target table includes entries for the parameterisation of a
target via a communication interface and also target positions that can be retrieved via the digital inputs. For each entry, the
positioning method, motion profile, acceleration and deceleration times, and maximum speed can be defined. All of the targets
can be pre-parameterised. All that the user has to do for performing the positioning is to select the desired entry and to issue a
start command. It also possible to change the target parameters online via the communication interface.
The item Servo Positioning Controller C 3-Series can store at total of 256 position sets.
The following settings are possible for the position sets:
Target position
Speed of movement
Final speed
Acceleration
Deceleration
Torque feedforward control
Remaining distance message
Additional flags:
Relative/relative to last target/absolute
Wait for end/interrupt/ignore start
Synchronised
Rotary axis
Option: automatic deceleration if no follow-up positioning is specified
Various options for the set-up of path programs
The position sets can be addressed via the bus systems or via the item Motion Soft
parameterisation software. The
positioning process can be controlled via digital inputs.