ABB ACSM1 Series, Manual

Page: 72 / 510

Drive control and features
72
Actual position correction
The purpose of the actual position correction is to compare the difference between
62.16 PROBE1 POS and the actual encoder position at the moment when the
triggering conditions are fulfilled. If there is a deviation, a corresponding correction is
carried out on signal
1.12 POS ACT . The required transition is determined by the
position profile generator parameters.
Note: Probe 1 settings must always be used for the actual position correction.
This configuration also works with the estimated position besides the encoder
position.
Example:
The following figure presents a roll-over application. The motor rotates a round table.
There is a mechanical gear between the motor and load. The gear is prone to
produce some drift on the load side. In order to compensate this drift, actual position
correction is used. A proximity switch is located on the load side at 90°.
Parameter Setting Information
60.05 POS UNIT (1) Degree All position values are in degrees
62.14 CYCLIC CORR
MODE
(1) Cor Act Pos Actual position correction
62.15 TRIG PROBE1 (1) ENC1 DI1 _– Rising edge of encoder 1 digital input DI1.
Source of the actual position latching command
(proximity switch signal source)
60.02 POS AXIS MODE (1) Rollover Positioning is between 0 and 1 revolutions, ie, after
360°, the position calculation starts from 0° again.
62.16 PROBE1 POS 90° Reference position for the actual position probe
M
3~
90°
ENCODER LOAD GEARBOX MOTOR
PROXIMITY SWITCH
Encoder DI1