TM70 Handheld Wireless Remote Control
U003.6.0-TM70_HH_SYS-R
targeted working zone as shown in Figure 13. Range Limited TM70 RF transmitters are
equipped with an infrared sensor that receives the information from the LA70
transmitter, analyzes the information, and then acts as a permissive. If the transmitter
does not receive the infrared data within a pre-determined time (factory setting is four
(4) seconds), the outputs are deactivated.
Figure 13 shows some LA70 IR Range Limiter application examples.
Figure 13. Range Limiter Application Examples
4.6.1 Infrared Sensor
As the system or operator moves, an infrared sensor located in the TM70 remote
control transmitter receives infrared information as it is transmitted from the LA70
transmitter. The remote microprocessor gathers the sensor information and checks for
the crane or machine ID. If the operator is too far away from the LA70, the sensor stops
receiving an IR signal and the TM70 transmitter LED begins to flash RED warning the
operator that the sensor must be back within signal range within four (4) seconds (the
system default). If the operator fails to get back into range within the allotted time, all
active commands are stopped; however, the RF communication is maintained with the
receiver and remains in control of the main-line contactor and the selection commands.
The operator must move the TM70 transmitter into the defined working area, or zone, to
regain control the crane or machine. Movement commands must be disabled and
reestablished for control. Transmitters having displays will show the message “Out of
Range” while the transmitter is beyond working range.
Four (4) modes of operation are defined in the EEPROM:
1. Range Limiter Only At Startup (Electronic Key): The transmitter must be within
the define control zone upon startup.
2. Range Limiter Only In Operation: The transmitter can be started anywhere, but
control will only occur when the transmitter is within the defined limits of the
sensors.
3. Range Limiter At Startup And Operation: The transmitter functions only within
the sensor limited range.
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