Speed Measurement System; Table 26 Malfunction, No Speed Meas; Table 27 Malfunction, Measured Speed Too High; Table 28 Malfunction, Measured Speed Too Low - ABB HT574400 Operation Manual

Operation Manual / 4 Product description / A100-M axial
7 Troubleshooting
7.5

Speed measurement system

No signal or poor signal amplitude of the speed measurement
Possible causes
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.
Sensor defective
Table 26: Malfunction, No speed measurement signal or poor signal amplitude
Measured speed too high
Possible causes
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.
Table 27: Malfunction, Measured speed too high
Measured speed too low
Possible causes
Turbocharger - -
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-
NOTICE
tion.
© Copyright 2016 ABB. All rights reserved.
Remedy
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).
Contact ABB Turbocharging Service Station.
Remedy
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.
Remedy
Contact ABB Turbocharging Service Station
HZTL4033_EN
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Revision A July 2016