Operation Manual / TPL69-A10 / -A30 ... TPL77-A10 / -A30
6 Troubleshooting / 6.5 Speed measurement system
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HZTL2481_EN
Revision C
May 2018
6.5 Speed measurement system
Possible causes
Elimination
Signal amp-
litude non ex-
istent 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 prob-
lems for the evaluation electronics.
This problem is eliminated by removing
the gasket.
Defective sensor Contact ABB Turbocharging service sta-
tion.
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 triggering.
Remove the sensor, clean its tip and refit
the sensor using the specified tightening
torque.
Measured
speed too low
- -
Contact ABB Turbocharging service sta-
tion.
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.
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