Operation Manual / TPL65VA10 / VA30
Troubleshooting
6
Speed measurement system
6.5
Page 81
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Speed measurement system
6.5
Possible causes
Elimination
Signal
amplitude non
existent or
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 it is fitted by mistake,
the distance from the sensor tip to the sig-
nal-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 ABB Turbocharging service station.
Measured
speeds too
high
Dirty sensor tip The sensor tip is magnetic and can thus at-
tract metal particles. As a result, the dis-
tance to the auxiliary bearing decreases,
which can lead to amplification of the noise
component and consequently to faulty trig-
gering.
Remove the sensor, clean its tip and refit the
sensor using the specified tightening torque.
Measured
speed too low
- -
Contact ABB Turbocharging service station.
Other sources
of errors
- -
If none of the above measures eliminates
the problem, we recommend that you have
the speed measuring system inspected by
an official ABB Turbocharging service sta-
tion.
6.5
