Operation Manual / A170-M.. - A175-M..
8 Troubleshooting / 8.5 Speed measurement system
© Copyright 2021 ABB. All rights reserved.
HZTL4033_EN
Rev.H
July 2021
8.5
Speed measurement system
No signal or poor signal amplitude of the speed measurement
Possible causes
Remedy
Turbochar-
ger
The speed sensor was acci-
dentally fitted with an addi-
tional gasket.
An enlarged distance
between the sensor tip and
the signal-emitting sealing
disc reduces the voltage
amplitude of the speed sig-
nal.
The screw plug for the sensor is fitted with an ad-
ditional gasket (copper ring).
For information regarding the disassembly and as-
sembly of the speed sensor, refer to the chapter
Turbocharger speed.
Install the speed sensor without the additional
gasket (copper ring).
Sensor defective
Contact ABB Turbocharging Service Station.
Table 32: Malfunction, No speed measurement signal or poor signal amplitude
Measured speed too high
Possible causes
Remedy
Turbochar-
ger
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 ampli-
fication of the noise com-
ponent and, hence, to false
triggering.
For information regarding the disassembly and as-
sembly of the speed sensor, refer to the chapter
Turbocharger speed.
Dismantle the sensor, clean the sensor tip, and fit
the sensor back on with the specified tightening
torque.
Table 33: Malfunction, Measured speed too high
Measured speed too low
Possible causes
Remedy
Turbochar-
ger
- -
Contact ABB Turbocharging Service Station
Table 34: Malfunction, Measured speed too low
NOTICE
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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