Operation Manual / 4 Product description / A150-M56/66/57/67 -
A155-M..
7 Eliminating malfunctions / 7.5 Speed measurement system
© Copyright 2020 ABB. All rights reserved.
HZTL4032_EN
Rev.P
March 2020
7.5
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 chapter
.
Install the speed sensor without the additional
gasket (copper ring).
Sensor or cable defective
Contact an ABB Turbocharging Service Station.
Order new speed sensor (86505) (refer to chapter
).
Table 31: Malfunction of the speed measurement system – No 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 chapter
.
Dismantle the sensor, clean the sensor tip, and fit
the sensor back on with the specified tightening
torque.
Table 32: Malfunction of the speed measurement system – Measured speed too high
Measured speed too low
Possible causes
Remedy
Turbochar-
ger
- -
Contact ABB Turbocharging Service Station
Table 33: 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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