ABB ACSM1 - Page 68

Drive control and features
68
Example:
The following figure shows a conveyer system where a box should be positioned.
The conveyer belt is marked every 40 mm.
• Rising edge of encoder DI1 (proximity switch signal) is detected at the first mark
of the belt. Position 0 mm is stored to signal 4.03 PROBE1 POS MEAS.
• Next rising edge of encoder DI1 (proximity switch signal) is detected at the
second mark of the belt. Position 30 mm is stored to signal 4.04 PROBE2 POS
MEAS.
• The reference distance between the marks is 40 mm and the measured distance
between the marks is 30 mm, thus the error is 10 mm:
Parameter Setting Information
60.02 POS AXIS MODE (0) LINEAR Positioning between minimum position 60.14
MINIMUM POS and maximum position 60.13
MAXIMUM POS
60.05 POS UNIT (2) METER All position values are in metres
62.14 CYCLIC CORR MODE (3) 1 PROBE DIST Distance correction with one probe
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)
62.16 PROBE1 POS 0 m Reference position for position probe 1
62.18 PROBE2 POS 0.040 m (= 40 mm) Reference position for position probe 1
M
3~
40 mm
ENCODER GEARBOXMOTOR
PROXIMITY SWITCH
Encoder DI1
t
t
t
1.01 SPEED ACT
1.12 POS ACT
Encoder DI1
POSITION DERIVATION
MEASURED POSITION DIFFERENCE