Product Features
- 10 -
7
Product Features
Due to its essential advantages, the pseudo-absolute shaft information system LIMAX1M represents a particularly
inexpensive, insensitive and easy to install alternative to conventional shaft information systems. The specification
“M” in the type designation stands for “Miniature” and means the smallest sensor design of the LIMAX series.
Due to its compact design, LIMAX1M requires very little space and is therefore ideal for retrofitting and modern-
izing existing elevator systems.
During commissioning a one-time referencing is required, which must be requested by the lift control (see sec-
tion
9.6). After that LIMAX1M is auto-referencing, i.e. the system automatically detects the absolute position
after a moving distance of 240 mm (see
9.5 Pseudo-Absolute Measuring Principle).
LIMAX1M is able to cover hoisting heights of up to 90 meters at operating speeds of up to 4 m/s.
Compared to other shaft information systems, the LIMAX1M is characterized by an exceptionally low price. Flexi-
ble mounting options ensure simple and quick installation during the initial installation or when the measuring
system needs to be replaced.
7.1
Functional Principle
The magnetic tape AB20-80-10-1-R-D-15-BK80 carries the unique positioning information as a magnetic code.
It is installed free hanging in the elevator shaft by use of a mounting kit. The sensor head is mounted to the ele-
vator car. While the actual measurement is contactless the tape must be kept within a maximum distance to the
sensor head. Therefore, the tape is guided along the sensor by use of the polymer tape guide which is an inte-
gral component of the sensor head.
The magnetic measurement principle is extremely robust. Dust, dirt and humidity do not affect the measurement
in any way. Also, smoke and even higher temperatures have no influence on the measuring quality. Further the
tape is robust enough to withstand the sometimes-harsh conditions in elevator shafts.
7.2
Structure of the Sensor
The LIMAX1M sensor consists of the following components:
Sensor housing with integrated mounting holes
RJ45 socket for CAN or mini-USB socket for USB interface (according to order specification)
Guidance made of sliding plastic (keeps the magnetic tape at a defined distance from the sensor).
Triple LED line for status messages and operating states.
Figure 1: Structure of the LIMAX1M sensor
RJ45 slot
Status LEDs
Mini USB
Mounting holes
Magnetic tape guidance