Operation Manual / 4 Product description / A130-M.. - A145-M..
7
Eliminating malfunctions
Page 71 / 121
© Copyright 2017 ABB. All rights reserved.
HZTL4031_EN
Revision E
January 2017
7.5
Speed measurement system
No signal or poor signal amplitude of the speed measurement
Possible causes
Remedy
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.
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-
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 30: Malfunction of the speed measurement system – No signal or poor signal amplitude
Measured speed too high
Possible causes
Remedy
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.
For information regarding the disassembly and as-
sembly of the speed sensor, refer to chapter Replac-
Dismantle the sensor, clean the sensor tip, and fit the
sensor back on with the specified tightening torque.
Table 31: Malfunction of the speed measurement system – Measured speed too high
Measured speed too low
Possible causes
Remedy
Turbocharger - -
Contact ABB Turbocharging Service Station
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.