Service Training
Section 6
Page 20
6.1.9 Traction motor speed sensor 1B2
A sensor 1B2 is mounted on the traction motor. This sensor is controled by the cog wheel mounted on the
rotor.
The sensor is supplied with +8.2V (outputs terminals 1X1: 46 / 69 of the LAC) and provides two pulse
outputs with dephased time slots of 90°. These signals are transmitted to the traction control module
(inputs terminals 1X1:9 / 10 of the LAC) as well as to the controller LES where they are processed to
determine the speed and the direction of rotation of the traction motor. No regulation is provided for the
speed sensor.
CAUTION: If the sensor is not mounted properly or if the connector 1X2 is disconnected, it will be followed
by a traction speed of 0.2Km/h and the motor effective current will increase to the Imax current of 270A
(with a standard factory truck parameterisation).
TRACTION SPEED SENSOR
Connector 1X2
Terminal
Colour Function
1 YE(152) Supply +8.2 V
2 WH(101) Output channel A
3 YE(176) Negative
4 WH(102) Output channel B
Towards
LES
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