ABB ACSM1 Series, Manual

Page: 80 / 510

Drive control and features
80
• 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:
( 62.18 PROBE2 POS - 62.16 PROBE1 POS ) - ( 4.04 PROBE2 POS MEAS - 4.03
PROBE1 POS MEAS )] = (40 - 0) - (30 - 0) = 10 mm
Note: Only after the active correction is finished is the next position latching enabled.
t
t
t
1.01 SPEED ACT
1.12 POS ACT
Encoder DI1
POSITION DERIVATION
MEASURED POSITION DIFFERENCE