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43 ENCODER ERROR
Condition for error detection
This alarm shows that the encoder information are incorrect or absents.
The encoder transmits signals only when the motor is running. The alarm is noticed by the logics when
40Hz are passed.
If on the dashboard appers the alarm and the operator makes the reset with the key with the machine
stopped, the alarm disappears.
If the alarm signal is given before reaching 40 Hz, the problem may be linked to the incorrect insulation of
a power cable on the chassis: without the correct encoder signals, the machine stays still or moves very
slowly. To determine whether the problem is to be attributed to the encoder or to the logic, proceed as
follows:
• Check the state of the wiring harness and the connectors.
• Check that there are 12V between pins 1 and 2 connector J13
• Check the state of the encoder ball bearing as shown below
Use an analogic or digital multimeter to determine where is located the problem.
Encoder basic electric diagram.
In the figure there is only one signal (A).
The encoders used generate two equal signals,
with a 90° difference (A-B).
1. Connect the tester positive point (red) to the
encoder positive terminal.
2. Connect the tester COM point (black) to the
encoder signal (A).
According to the engine position, the following
values will be displayed:
• low signal: 0.5 -- 1.5 Volt
• high signal: 10.5 -- 11.5 Volt
Intermediate values cannot be read as the motor
is stopped.
If the motor is working, the multemeter will
automatically read the Mv (medium value)
Mv= 5,5 - 6,5 Volt
Carrying out this test directly on the logic
connectors it is possible to determine if the
signals are good (see upper description) or if the
channels are opened or in shour circuit. If the
signals are good, the problem should be
attributed to the logic unit.
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