Novexx Solutions ALS/XLS 204, Service & Installation Manual

Page: 109 / 312

Service Manual
ALS/XLS 20x/256/272
02/2019 | 02 109
– Typical values: up to 200 mm
m: step mode
Depending on the sensor features and the labeler features and the choosen configuration, there
are three ways of counting the pulses of the rotary encoder:
– m=1: each pulse is counted as one step (setting required with ALS 104)
– m=2: each pulse is counted twice (rising and falling edge) (Application: labeler in single-phase
mode, setting required with ALS/XLS 2xx, ALS 30x, ALX 73x)
– m=4: double-phase operation; rising and falling edge of each pulse is counted. Thus, a sensor
pulse can be decoded into four counting steps (Application: Labeler in double-phase mode, set-
ting required with ALS/XLS 2xx, ALS 30x, ALX 73x)
g: gear ratio
– Is required, if the rotary encoder is flanged directly to the motor axle, and if a reduction gear is
switched between motor and drive axle of the conveyor. In this case rules: g>1.
– See Rotary encoder at the motor axle

on page 105.
v: max. speed
Maximum dispensing speed, which should be reached by the labeler.
Limits
f
limit
: max. frequency
The maximum admissible signal-input-frequency is 20 kHz. This is dependent on the galvanic
separation and a digital filter for noise suppression. If the specific output frequency of the
rotary
encoder is lower, than this value must be entered here.
x
limit
: min. resolution
– Minimum admissible resolution, referred to the conveyor belt distance which must be measura-
ble.
– The resolution should be at least 0.2 mm, to avoid significant deterioration of the dispensing ac-
curacy on the product.
c
limit
: run length counter
The labeler counts the steps between product photoelectric sensor and dispensing edge. Be-
cause of the counter register being 16 bit wide (including polarity sign) and no overflow being
allowed, the max. counter value is 2
15
-1 = 32767.
Calculations
Size Symbol Calculation Note
W heel circumference
Max. speed 1000 mm = 1 m; 60 s = 1 min
Resolution ok, if
Frequency ok, if
Max. distance product sensor
to dispensing edge
U U

d

=

3 1415926

=
v v
mm
s
---------
v
m
min
---------
1000
60
------------

=
x x
U
p m g
 
------------------- =
x x
limit

f f
v p g
 
U
----------------- =
f f
limit

a a x c
limit

=