Drive control and features
69
(62.18 PROBE2 POS - 62.16 PROBE1 POS) - (4.04 PROBE2 POS MEAS - 4.03
PROBE1 POS MEAS)] = (40 - 0) - (30 - 0) = 10 mm
The error is stored to 4.18 SYNC ERROR.
Actual position of the encoder 1.12 POS ACT is corrected according to 4.18 SYNC
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.
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
M
3~
60 mm
ENCODER GEARBOXMOTOR
PROXIMITY SWITCHES
Encoder DI1
Encoder DI2
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