ABB ACSM1 Series, Manual

Page: 81 / 510

Drive control and features
81
Distance correction with two probes
The purpose is to measure the distance between two consecutive latches from two
probes and compare it with the distance between the reference positions
62.16
PROBE1 POS and 62.18 PROBE2 POS . If there is a deviation, a corresponding
correction is carried out on the drive actual position 1.12 POS ACT . The latches use
different latch sources (eg, encoder interface digital inputs DI1 and DI2) and latch
commands (eg, rising and falling edge).
In special applications, this correction function can also be executed by using two
consecutive latches from one probe. The latches use the same latch source (eg,
encoder digital input DI1) and different latch commands (eg, rising and falling edge).
Example:
The following figure shows a conveyer system where a box should be positioned.
The conveyer belt is marked every 60 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 (4) 2 Probe Dist Distance correction with two probes
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)
62.17 TRIG PROBE2 (3) ENC1 DI2 _– Falling edge of encoder 1 digital input DI2.
Source of the actual position reference latching
command (proximity switch signal source)
62.16 PROBE1 POS 0 m Reference position for actual position probe 1
62.18 PROBE2 POS 0.060 m (=60 mm) Reference position for actual position probe 2
M
3~
60 mm
ENCODER GEARBOX MOTOR
PROXIMITY SWITCHES
Encoder DI1
Encoder DI2