FM26001c_e.doc / Nov-11
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2. Application Examples
2.1. PPR numbers which are not available with encoders
Some applications may require an encoder with a ppr number that is not available on the market, or
which is difficult to get. In such cases the FM 260 multiplier will be able to generate your required
ppr number from the output of any standard encoder.
The example shows how to simulate an encoder with the unusual number of 5431 pulses/rev. from a
standard 4096 ppr encoder, just by setting Factor 1 to 0.5431 and Factor 2 to 0.4096.
This principle even allows encoder operations with non-integer ppr numbers, e.g. to make an encoder
with 100.4 impulses per revolution..
In
Ou t
A, /A , B, / B, Z, /Z
0, 40 96
0, 5431
x
(Example)
5431 ppr
A , /A, B, /B , Z, /Z
En code r wi th
40 96 pp r
2.2. Fine tuning of circumference and attrition of a measuring wheel
Many times, in extensive production lines, only one single encoder with measuring wheel is
responsible for the control of several different follower machines and controls. Where an attrition of
the wheel would require readjustments in order to keep the accuracy, this would need to happen
individually on every of the following machines and related controls (provided that such kind of
tuning facility is available at all).
With use of a FM 260 multiplier there is an easy way of fine-tuning of the whole line in one central
location only. If applicable, even remote tuning is possible via PLC and serial communication or via
PROFIBUS.
Measuring wheel
Encoder
FM 260
Impulse
Splitter
Folower machine 1
Follower machine 2
Follower machine 3
Control system
PLC
Material line
Fine tuning by changing the factor: x 0,9998 ... 0,9999 ... 1,0000 ... 1,0001 etc.
