ABB HT596388 - Speed Measurement System; Table 27: Malfunction of the Speed Measurement System - no Signal or Poor Signal Amplitude; Table 28: Malfunction of the Speed Measurement System - Measured Speed too High; Table 29: Malfunction of the Speed Measurement System - Measured Speed too Low

Operation Manual / 4 Product description / TPS44-H.. - TPS52-H..
8 Eliminating malfunctions / 8.5 Speed measurement system
© Copyright 2017 ABB. All rights reserved. HZTL4037_EN Revision E July 2017
8.5 Speed measurement system
No signal or poor signal amplitude of the speed measurement
Possible causes Remedy
Turbocharger 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 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 chapter Repla-
cing the speed sensor →22.
Install the speed sensor without the additional gas-
ket (copper ring).
Sensor or cable defective Contact an ABB Turbocharging Service Station.
Order new speed sensor(86505) (refer to chapter
Ordering spare parts →75).
Replacing the speed sensor →22.
Table27: Malfunction of the speed measurement system – No signal or poor signal amplitude
Measured speed too high
Possible causes Remedy
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 amplifica-
tion of the noise component
and, hence, to false triggering.
For information regarding the disassembly and as-
sembly of the speed sensor, refer to chapter Repla-
cing the speed sensor →22.
Dismantle the sensor, clean the sensor tip, and fit
the sensor back on with the specified tightening
torque.
Table28: Malfunction of the speed measurement system – Measured speed too high
Measured speed too low
Possible causes Remedy
Turbocharger - - Contact ABB Turbocharging Service Station
Table29: Malfunction of the speed measurement system – Measured speed too low
If none of the measures described above remedy the malfunction, have the speed measure-
ment system checked by an ABB Turbocharging Service Station.
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