Speed Measurement System; Table 27: Malfunctions Of The Speed Measurement System - ABB XAC25354 Operation Manual

Operation Manual / A100-L
8 Troubleshooting / 8.5 Speed measurement system
8.5

Speed measurement system

Possible causes
No signal Assembly fault
or poor
signal
amplitude
present
Sensor defective
Measured Contamination of
speed too the sensor tip
high
Measured - -
speed too
low
Other - -
causes of
malfunc-
tion
Table 27: Malfunctions of the speed measurement system
© Copyright 2021 ABB. All rights reserved.
Remedy
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.
Contact ABB Turbocharging Service Station
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.
Contact ABB Turbocharging Service Station
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.
HZTL4034_EN Rev.T December 2021