Product Features; Functional Principle; Sensor Construction - ELGO Electronic LIMAX2 Series Operating Manual

7 Product Features

LIMAX2 is an absolute measuring shaft information system that is used for positioning of elevator cars. It consists
of only two components: sensor and magnetic band.
A big advantage of the system is the simple and flexible installation. The assembly of the system components is
very simple and can be performed by specialists in less than an hour. The system can be placed anywhere in the
shaft, depending of the space conditions. With the small space requirement, LIMAX2 is perfect for retrofitting
and modernization.
LIMAX2 detects the absolute car position up to a hoisting height of 260 meters and is designed for speeds of up
to 10 m/s. In the standard configuration LIMAX2 evaluates the position with a resolution of 1 mm. Resolutions
up to 0.0625 mm are possible.
LIMAX2 is equipped with various interfaces and thus can be directly connected to the most established elevator
controls.
The features at a glance:
Robust measuring principle for usage in rough environments
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Simple and flexible installation
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High accuracy and reproducibility
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No slip
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Absolute position is always directly available - no referencing even after long power outages
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7.1 Functional principle

The concept is simple: A sensor mounted on the elevator car detects the current absolute car position using Hall
sensors, which read the magnetic tape mounted in the shaft without any contact. Through this method, the car´s
position can be determined at any time with high accuracy. The guide is only used to keep the tape within a
defined distance from the sensor.
Due to its robustness, the magnetic tape technology is ideal for use in elevator systems - dust, dirt, and even
dense black smoke won't affect measurement quality. The system even withstands humidity and high tempera-
tures without any problems - making LIMAX2 ideally suited for firefighters´ elevators. And that with a long
maintenance-free service life.
7.2

Sensor Construction

The sensor consists of the following components:
Sensor housing with integrated LED line for signaling various states and with permanently connected
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cable connection for power supply and for communication with the lift controller.
Guide rail with plastic underlay (keeps the magnetic tape at the defined distance from the sensor).
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Safety splint for mechanical fixing of the polymer guide strip.
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Guide unit:
Safety splint
Guide rail
Underlay
Signal LEDs
Cable outlet
Figure 1: Sensor Construction
Cable gland
Product Features