17
9. TM70 RANGE LIMITER
9.1.- SYSTEM DESCRIPTION
TM70 radio remote control systems can be equipped with a range limitation option for overhead
cranes, through which, the system is able to determine if the transmitter is located outside of a
zone, defined as a working area, and deactivates the controls when these situations arise.
coming
from the LA70
transmitter.
This information
is analysed
by transmitter
The system consists of one or more Infrared transmitters LA70, installed either in fixed positions or
on the controlled crane, oriented in such a way that it covers the targeted working zone. In these
cases the transmitters of the remote control sets are equipped with a sensor which receives the
information
microprocessor,
which,
in this way knows
when the operator
has left the working
area.
Consequently, outputs are deactivated. Application examples
9.2.- INFRARED SENSOR
As explained in the above, the sensor element is located in the remote control transmitter and its
function is to receive the infrared information coming from the LA70 transmitter. The location of this
sensor is the following:
