Service Manual iFLEX5
© Hirschmann Rev. I 0522/17 190154_I.DOC
6 LENGTH SENSING
The system measures the length of the main boom of the machine with a length sensor. The length
sensor is contained within the cable reel, located on the left side of the main boom.
Block Diagram
The signal runs from the length sensor to the CAN-Bus converter board, both
located in the cable reel. From there, it travels as digital information on the
CAN-Bus to the pressure transducer, which acts as a T-connector to the main
CAN-Bus running to the central unit.
So, what do you do when you are having a problem with your length read-out?
Start by verifying the length display. Refer to the section “Troubleshooting A Sensor Problem Using
The Display” to call up the sensor signal on your console display. The CAN-Bus is digital and as such
will either transmit the signal correctly or not at all. If your readings are off, you have to determine
what is causing the problem (reference the following flow charts).
CAN-Bus electronics in cable reel.
The length sensor has a potentiometer built in that is driven by a gear drive from the cable drum. As
the length changes, the cable drum will turn and with it the potentiometer’s axle. The converter board
supplies a voltage of about 4.7V to the length potentiometer and in return monitors the output voltage
of the potentiometer. The terminal used is X20. The length sensor is connected as follows:
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