ABB ACSM1 - Page 61

Drive control and features
61
There are three different preset functions:
• SYNCH REF: Preset drive synchron reference chain (4.16 SYNC REF GEARED)
to the value of 62.12 PRESET POSITION.
• ACT TO SYNCH: Preset drive synchron reference chain (4.16 SYNC REF
GEARED) to the value of actual position (1.12 POS ACT).
• WHOLE SYSTEM: Preset whole position system of the drive to the value of 62.12
PRESET POSITION.
In addition, homing mode 35 (selectable by parameter 62.01 HOMING METHOD),
can be used to set the position reference chain (4.13 POS REF IPO, 4.16 SYNC
REF GEARED, 4.17 POS REF LIMITED, 1.12 POS ACT) to the value of 62.09
HOME POSITION on a rising edge of 62.04 HOME SWITCH TRIG.
Cyclic position correction
Cyclic position correction functions are used to change or correct the system
position continuously according to data measured by external probe signals, for
example, if there is play in the machinery. There are five different cyclic position
correction functions selectable by parameter 62.14 CYCLIC CORR MODE:
• CORR ACT POS: Drive actual position correction.
• CORR MAST REF: Synchronised master drive reference correction.
• CORR M/F DIST: Master and follower distance correction.
• 1 PROBE DIST: Drive actual position correction according to the distance
between two latches from one probe.
• 2 PROBE DIST: Drive actual position correction according to the distance
between two latches from two different probes.
Actual position correction
The purpose of the actual position correction is to measure a position and compare it
with the actual encoder position. If there is a deviation, a corresponding correction is
carried out. The required transition is determined by the position profile generator
parameters.
Note: Probe 1 settings must always be used for the actual position correction.
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