Elgo FMAX2 Series, Руководство по эксплуатации

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Product Features
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5 Product Features
FMAX2 is a magnetic absolute measuring system designed for linear measur-
ing lengths up to 192 mm or for rotative applications with a diameter of
around 61 mm. In contrast, the FMAX3 variant processes lengths up to
max. 240 mm and diameters of 80 mm. A compact metal housing includes
the sensor system and the required evaluation electronics, which convert the
measured signals into an SSI interface format.
In linear application with a coded magnetic tape, the sensor system processes
operating speeds of up to 16 m/s. In the rotary range and when using a
coded magnetic ring, speeds of up to 6,000 rpm can be processed. Hard
ferrite rings are available on request.
Advantages:
With its high measuring accuracy at 19-bit resolution and non-contact scanning, FMAX2 / FMAX3 represents a
cost-effective and wear-free alternative to comparable measuring systems. Furthermore, the system is very quick
and easy to install.
Applications:
A typical application for FMAX2 and FMAX3 are motor feedback systems. The system is also suitable for a wide
range of linear, radial and rotary applications in mechanical engineering, e.g. in wood, sheet metal and metal
processing.
5.1 Linear Measurement with Magnetic Tape
For linear measuring tasks, the dual-track absolute coded magnetic tape is glued onto a flat surface by using
the supplied adhesive tape. The absolute measuring system is mounted with a maximum reading distance of 0.3
mm to the magnetic tape. When using the magnetic without cover tape, an extended reading distance of up to
0.6 mm is possible. The width of the magnetic tape is 10 mm.
5.2 Rotative Measurement with Magnetic Ring
For radial or rotative measuring tasks, a 6 mm wide ELGO magnetic tape is bonded at the factory to a steel
ring. This “magnetic ring” contains 128 individual poles (
≙
64 pole pairs). It can be mounted on the axis either
as a thermal fit or by gluing. For more details refer to section

7.3.
The maximum permitted reading distance of the sensor to the magnetic ring is 0.6 mm.
5.3 Functional Principle
For scanning, two Hall sensors are guided over a magnetic tape or a magnetic ring with a master track and a
nonius track. Both tracks consist of an alternating north/south pole magnetization. From the combinatorics of
the phase position of the two magnetic tracks a clear assignment of the absolute position is possible. The pole
pitch of the master track is 1.5 mm for FMAX2 and 2 mm for FMAX3.
Figure 2: Magnetic tape / ring - dual-track encoding
N N
N N
N N N N
N N
S S S S S S
S S S S S
Master track
Nonius track
1.5 mm 1.5238 mm (AB20-15 / FMAX2)
2.0 mm 2.0317 mm (AB20-20 / FMAX3)
Figure 1: FMAX2/3 linear & rotativ