Operation Manual / 4 Product description / A100-M axial
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7.5 Speed measurement system
No signal or poor signal amplitude of the speed measurement
Turbocharger The speed sensor was acci-
dentally fitted with an additional
gasket.
An enlarged distance between
the sensor tip and the signal-
emitting sealing disc reduces
the voltage amplitude of the
speed signal.
The screw plug for the sensor is fitted with an addi-
tional gasket (copper ring).
For information regarding the disassembly and as-
sembly of the speed sensor, refer to the chapter Tur-
bocharger speed.
Install the speed sensor without the additional gasket
(copper ring).
Sensor defective Contact ABB Turbocharging Service Station.
Table 26: Malfunction, No speed measurement signal or poor signal amplitude
Turbocharger Sensor tip contaminated, since
it is magnetic and can attract
metallic particles. This reduces
the distance to the signal-
emitting sealing disc, which
can lead to amplification of the
noise component and, hence,
to false triggering.
For information regarding the disassembly and as-
sembly of the speed sensor, refer to the chapter Tur-
bocharger speed.
Dismantle the sensor, clean the sensor tip, and fit the
sensor back on with the specified tightening torque.
Table 27: Malfunction, Measured speed too high
Turbocharger - - Contact ABB Turbocharging Service Station
Table 28: Malfunction, Measured speed too low
Other causes of malfunction
If none of the measures described above remedy the malfunction, have the
speed measurement system checked by an ABB Turbocharging Service Sta-
tion.
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