Speed Measurement System - ABB HT570679 Operation Manual

Operation Manual / 4 Product description / A150-M.. - A155-M..
7 Eliminating malfunctions
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 or cable defective
Table 30: Malfunction of the speed measurement system – No 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 31: Malfunction of the speed measurement system – Measured speed too high
Measured speed too low
Possible causes
Turbocharger - -
Table 32: 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.
© Copyright 2017 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 chapter Replac-
ing the speed sensor [➙ 32].
Install the speed sensor without the additional gasket
(copper ring).
Contact an ABB Turbocharging Service Station.
Order new speed sensor (86505) (refer to chapter
Ordering spare parts [➙ 113]).
Replacing the speed sensor [➙ 32].
Remedy
For information regarding the disassembly and as-
sembly of the speed sensor, refer to chapter Replac-
ing the speed sensor [➙ 32].
Dismantle the sensor, clean the sensor tip, and fit the
sensor back on with the specified tightening torque.
Remedy
Contact ABB Turbocharging Service Station
HZTL4032_EN
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Revision F January 2017