chapter 5000
page 61
1,2 - 2,0 t A.C.
SERVICE MANUAL
Electric
036-0410-07
Speed sensor basic electric diagram.
The figure shows only one signal (A).
The encoders used have two equal signals, with a
phase difference of 90°(A-B).
1. Connect the multemeter positive point (red) to
the encoder positive terminal.
2. Connect the multemeter 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 running, the multemeter will
automatically read the Mv (medium value)
Mv= 5.5-6.5 Volt
Carrying out this test directly on the logic
connector, you can determine if the signals are
good (see above-mentioned description) or if the
channels are open or in short circuit
If the signals are good, the problem should be
attributed to the electronic control.
In the contrary case repeat the test directly on the
encoder connector. If the problem persists to
replace the encoder.
sensor
CODE ALARM DESCRIPTION
43 ENCODER ERROR Encoder failure.
This alarm indicates that the encoder information is not correct or is not
present.
The encoder transmits signals only when the motor is running. The alarm is
detected by the logics when it exceeds 20Hz.
Therefore, if an error signal appears on the dashboard and the operator
uses the reset key with the machine stopped, the alarm disappears -
however, it remains stored in the logic.
If the alarm signal starts before reaching 20Hz, the problem can be
attributed to a possible wrong insulation of a power cable on the frame.
without the encoder correct signals, the machine remains still or moves very
slowly. To determine whether the problem is to be attributed to the encoder
or to the logic,proceed as follow.
Set the SLIP CONTROL on OFF and speeding up slowly.
Please note that the engine speed increase does not necessary mean that the
problem is linked to the encoder. Any of the following components may
have a fault:
- The logic internal circuit
- The encoder
- The wiring
You may use a digital or analogue multemeter to determine where the
problem is located.
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