Product Features; Functional Principle - ELGO Electronic FMax Series Operating Manual

3 Product Features

Series FMAX is an absolute magnetic length measuring system and only of use for recordation of lengths. It con-
sists of a guide carriage, where sensor technology and translator are placed, and a guide rail FSMAB. A mag-
netic tape is installed on the guide rail. The guide carriage is guided contactless over the magnetic tape.
Typical applications are paper cutting machines, hydraulic presses, wood- and sheet metal processing ma-
chines.
Overview of features:
no reference adjustment necessary

direct measurement

measuring lengths up to 650 mm

high resolution up to 0.01 mm

repeating accuracy +/- 0.01 mm

protection against dirt and dust

easy installation

Interfaces: RS232, RS422 and SSI ( 9.1)

3.1

Functional Principle

Three sensors are guided over a magnetic tape, recorded with three tracks. The following illustration shows the
three magnetic tracks with following north- and South Pole magnetization, sensed by magneto-resistive resistor
measuring bridges. Between the single magnetic tracks there always is an equal shifting X. This is evaluated
together with the single signs of the resistive resistor measuring bridges and delivers an absolute value. An un-
ambiguous classification of a absolute position is possible by the combination of the phasing of the three mag-
netic tracks. The phase position zero repeats every 650 mm for each of the three tracks.
Track 1
S N S N S N S N S N S N S N S N S N S N
U
1
Track 2
S N S N S N S N S N S N S N S N S N S N
U
2
S N S N S N S N S N S N S N S N S N S N
Track 3
U
3
0
X
∆ X
Figure 1: Functional Principle
Sensor 1
Sensor 2
Sensor 3
L = max. 650 mm
S
N
S S
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Product Features
S N S N
S N S N
S N S N
0