Operation Manual / 4 Product description / A130-H.. - A140-H
7 Eliminating malfunctions / 7.5 Speed measurement system
© Copyright 2017 ABB. All rights reserved.
HZTL4030_EN
Revision D
May 2017
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
additional gasket (copper ring).
For information regarding the disassembly and
assembly 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 26: 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 amp-
lification of the noise com-
ponent and, hence, to false
triggering.
For information regarding the disassembly and
assembly of the speed sensor, refer to chapter
.
Dismantle the sensor, clean the sensor tip, and
fit the sensor back on with the specified tighten-
ing torque.
Table 27: 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 28: 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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