Product Features; Functional Principle - ELGO Electronic EMAX-HI Series Operating Manual

3 Product Features

EMAX-HI is a magnetic length measuring system. Sensor and translator are integrated in one housing. The mag-
netic tape is attached to a flat surface using the adhesive tape included in the delivery. EMAX-HI can be installed
at a distance of up to 0.5mm from the magnetic tape (without cover tape).
The absolute measuring system provides the following advantages:
No referencing necessary.

Direct and contactless measurement.

The distance between the sensor and the magnetic tape can vary between 0.1 and 0.5 mm

(without covering tape). The LED on the housing of the sensor glows RED if this distance is crossed.
Measuring length up to 8 m.

High resolution: 0.001 mm.

Repeating accuracy ±1 Increment.

Very robust against dirt.

Regarding the interface, different options are available SSI, RS422 or CANopen (DS 406).
CAN VASIC ELGO (CN0) and BISS-C on request.
Typical applications are linear drives.
3.1

Functional principle

A Hall sensor and a magneto-resistive impedance measuring bridge are guided over a two-track magnetic tape
with a fine-interpolation trace and an absolute trace. Together with the sensor line the absolute track provides
an absolute value and the fine-interpolation trace provides together with the interpolation electronic the measur-
ing systems high resolution.
The figure shows two magnetic traces, with north-pole and south-pole magnetization. The fine interpolation
trace encloses alternately north and south-pole traces with a distance of 1 mm, these are scanned with re-
sistance bridges and provide a resolution of 0.001 mm. The absolute value provides the sensor line with 16
single Hall sensors, these sensors are scanning the code sections of the north and south poles. The absolute
value on the magnetic tape recurs every 8 m.
N S N S N S N
S N S N S
Distance detection via LED
Figure1: Mounting direction
S N
N
S N S N S N S N
S N S
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Product Features
Fine interpolation track
S N S
Non magnetic track
N S
Absolute track