Operation Manual / 4 Product description / A100-L
7 Troubleshooting / 7.5 Speed measurement system
© Copyright 2021 ABB. All rights reserved.
HZTL4034_EN
Rev.S
May 2021
7.5
Speed measurement system
Possible causes
Remedy
No signal
or poor
signal
amplitude
present
Assembly fault
The screw plug for the sensor is fitted with a gasket.
This gasket must be removed when the speed sensor is as-
sembled. If the gasket has been inadvertently fitted, the dis-
tance of the sensor tip to the sealing disc giving the signal is in-
creased. 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.
Sensor defective
Contact ABB Turbocharging Service Station
Measured
speed too
high
Contamination of
the sensor tip
As the sensor tip is magnetic, it can attract material particles.
This reduces the distance to the auxiliary bearing, which can
lead to amplification of the noise component and therefore to
false triggering.
Dismantle the sensor, clean the sensor tip, and fit the sensor
back on with the specified tightening torque.
Measured
speed too
low
- -
Contact ABB Turbocharging Service Station
Other
causes of
malfunc-
tion
- -
If none of the measures described above remedy the malfunc-
tion, it is recommended to have the speed measurement sys-
tem checked by an ABB Turbocharging Service Station.
Table 26: Malfunctions of the speed measurement system
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