4.3.5.1 Defining the parameter Counts Per Meter (DSQC 377)
Introduction
The Counts Per Meter system parameter is used to calibrate the conveyor encoder.
The Counts Per Meter system parameter belongs to the type DeviceNet Command,
in the topic I/O System.
xx1900000551
Calculation for Counts Per Meter
The value for the Counts Per Meter system parameter is calculated as follows:
(position1*old_counts_per_meter)/measured_radians
DescriptionValue
Read from FlexPendant Jogging window.position1
The encoder’s old value.
Note
The encoders delivered from factory have a preset value.
For an IRC5 system this value is 20,000. This value can
be used to start the calibration with.
old_counts_per_meter
The manually measured radians that the conveyor has
been moved.
measured_radians
Defining Counts Per Meter
Use the following procedure to define Counts Per Meter for the conveyor encoder.
1 Put a mark on the conveyor belt, for example draw a line or attach a piece
of tape, and a mark on the side of the conveyor at the same location.
2 In the FlexPendant Program Editor, load and run the program ppacal.prg.
This sets the current position of the conveyor to zero. The value is shown
as CNV value in the Position part of the FlexPendant Jogging window.
3 Rotate the conveyor belt approximately 180 degrees.
4 In the FlexPendant Jogging window, read the position of the conveyor. This
is position1.
5 Measure the physical radians between the two marks. This is the value
measured_radians.
6 Calculate Counts Per Meter using the read and measured values.
For example: (1.5*20000)/0.5 = 60000
When this variable is applied to a circular conveyor, the actual meaning is counts per radian.
Continues on next page
208 Application manual - PickMaster® Twin - PowerPac
3HAC064218-001 Revision: B
© Copyright 2021 ABB. All rights reserved.
4 Working with PickMaster PowerPac
4.3.5.1 Defining the parameter Counts Per Meter (DSQC 377)
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