Operation Manual / 4 Product description / A100-L
7
Troubleshooting
Page 56 / 113
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HZTL4034_EN
Revision H
November 2016
7.5
Speed measurement system
Possible causes
Elimination
No signal or
amplitude is
poor
Fitting error
The screw plug for the sensor is fitted with a gasket.
When fitting the speed sensor, this gasket must be removed. If the
gasket is fitted by mistake, the distance from the sensor tip to the
signal-generating sealing disc increases. As a result, the voltage
amplitude of the speed signal decreases, which can cause problems
for the evaluation electronics.
This problem is eliminated by removing the gasket.
Defective sensor Contact an ABB Turbocharging Service Station
Measured
speeds too
high
Contaminated
sensor tip
The sensor tip is magnetic and can thus attract metal particles. As a
result, the distance to the auxiliary bearing decreases, which can
lead to amplification of the noise component and consequently to
faulty triggering.
Remove the sensor, clean its tip and refit the sensor using the spec-
ified tightening torque.
Measured
speed too
low
- -
Contact an ABB Turbocharging Service Station
Other
sources of
errors
- -
If none of the above measures eliminates the malfunction, we rec-
ommend that you have the speed measuring system inspected by
an ABB Turbocharging Service Station.
Table 26: Malfunctions of the speed measurement system