Speed Measurement System; Table 32: Malfunction, No Speed Measurement Signal Or Poor Signal Amplitude; Table 33: Malfunction, Measured Speed Too High; Table 34: Malfunction, Measured Speed Too Low - ABB HT608016 Operation Manual

Operation Manual / A170-M.. - A175-M..
8 Troubleshooting / 8.5 Speed measurement system
8.5

Speed measurement system

No signal or poor signal amplitude of the speed measurement
Possible causes
Turbochar- The speed sensor was acci-
ger 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.
Sensor defective
Table 32: Malfunction, No speed measurement signal or poor signal amplitude
Measured speed too high
Possible causes
Turbochar- Sensor tip contaminated,
ger 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.
Table 33: Malfunction, Measured speed too high
Measured speed too low
Possible causes
Turbochar- - -
ger
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.
© Copyright 2021 ABB. All rights reserved.
Remedy
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).
Contact ABB Turbocharging Service Station.
Remedy
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.
Remedy
Contact ABB Turbocharging Service Station
HZTL4033_EN Rev.H July 2021