ABB ACSM1 Firmware Manual page 69

(62.18 PROBE2 POS
PROBE1 POS MEAS)] = (40 - 0) - (30 - 0) = 10 mm
The error is stored to
Actual position of the encoder
ERROR using positioning parameter and dynamic limiter settings.
Note: Only after the active correction is finished is the next position latching enabled.
Distance correction with two probes
The purpose is to correct actual position according to the distance between the
latched positions and measured positions when latches from two probes are used.
The latches use different latch sources (e.g. encoder digital input DI1 and DI2) and
latch commands (e.g. 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 (e.g.
encoder digital input DI1) and different latch commands (e.g. 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.
ENCODER MOTOR
M
3~
Encoder DI1
Encoder DI2
Parameter
60.02 POS AXIS MODE
60.05 POS UNIT
62.14 CYCLIC CORR MODE (4) 2 PROBE DIST
62.15 TRIG PROBE1
62.17 TRIG PROBE2
62.16 PROBE1 POS
- 62.16 PROBE1 POS) -
4.18 SYNC ERROR.
1.12 POS ACT
60 mm
GEARBOX
Setting
(0) LINEAR
(2) METER
(1) ENC1 DI1 _-
(3) ENC1 DI2 _-
0 m
(4.04 PROBE2 POS MEAS
is corrected according to
PROXIMITY SWITCHES
Information
Positioning between minimum position
MINIMUM POS and maximum position
MAXIMUM POS
All position values are in metres
Distance correction with two probes
Rising edge of encoder 1 digital input DI1.
Source of the actual position latching command
(proximity switch signal source)
Falling edge of encoder 1 digital input DI2.
Source of the actual position reference latching
command (proximity switch signal source)
Reference position for actual position probe 1
Drive control and features
69
- 4.03
4.18 SYNC
60.14
60.13