Hirschmann PAT IFLEX5 - Page 16

Service Manual iFLEX5
© Hirschmann Rev. I 0522/17 190154_I.DOC
10
The length sensor returns a voltage between 0.16V at 0 turns of the length pot (= fully retracted) and
4.84V at 10 turns. How many turns you get at full extension depends on the gear ratio, the boom
length, the length cable used and the spooling pattern, so we cannot provide a standard table for it.
What we can give you for trouble-shooting, however is the following table that shows the expected
output voltage (measured between X20-5 and X20-3 Signal) for each complete turn of the length
potentiometer. Note that this does not sync to the number of turns of the cable reel, though:
Length Sensor Signal on Pin 3
Turns
Voltage X20-5 to
X20-3
Voltage GND to X20-3
0
0.00
0.16
1
0.46
0.62
2
0.93
1.09
3
1.40
1.56
4
1.87
2.03
5
2.34
2.50
6
2.81
2.97
7
3.28
3.44
8
3.75
3.91
9
4.22
4.38
10
4.68
4.84
Note: Actual voltages will vary slightly.
For the boom control system, the length sensors are the same as described above with the exception
of cable reel internals (location of hardware, wiring, and gear wheels). Refer to the LWG520 and
LG152 spare part list for these differences.
Length Sensor varies
Replace
converter
board.
If unplugging the length sensor
made the voltage return to the
acceptable range, replace the
length sensor. Follow procedure
for length sensor calibration.
YES
NO
1ST
2ND
Ensure the length
sensor is being
supplied with 4.7V by
measuring between
Pin 5 (-) and Pin 1 (+)
of the X20 terminal.
Is the voltage
between the
range of 4.7V
to 5.0V ?
See length sensor
signal chart below.
YES
NO
Unplug the length
sensor and
measure again.
Is the voltage
between the
range of 4.7V
to 5.0V ?