Speed Measurement System - ABB A140-H56 Operation Manual

Operation Manual / A130-H.. - A140-H..
9 Troubleshooting
9.5

Speed measurement system

Possible causes
No signal or poor Assembly fault
signal amplitude
present
Sensor defective
Measured speed Contamination of the
too high sensor tip
Measured speed - -
too low
Other causes of - -
malfunction
Table 27
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Remedy
The locking screw for the sensor is fitted with an additio-
nal gasket (copper ring).
This gasket must be removed when fitting the speed
sensor. If the gasket has been inadvertently fitted, the
distance of the sensor tip to the sealing disc giving the
signal is increased. This reduces the voltage amplitude of
the speed signal which can lead to problems with the
evaluation electronics.
This problem will be remedied by removing the gasket.
Contact ABB Turbocharging Service Station
As the sensor tip is magnetic, it can attract metal partic-
les. These reduce the distance to the signal-emitting se-
aling disc which can lead to amplification of the noise
component and, hence, to false triggering.
Dismantle the sensor, clean the sensor tip, and refit the
sensor with the specified tightening torque.
Contact ABB Turbocharging Service Station
If none of the measures described above remedy the
malfunction, it is recommended to have the speed mea-
surement system checked by an ABB Turbocharging
Service Station.
HZTL2414_EN
Page 81 / 115
Revision B
March 2013