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Operation Manual / TPL65VA32 / VA33
6 Troubleshooting / 6.5 Speed measurement system
6.5 Speed measurement system
6.6 Variable Turbine Geometry
© Copyright 2020 . All rights reserved.
Run-down time too short
Possible causes
Turbochar-
Turbocharger contaminated
ger
Damaged bearing
Rubbing rotor
Foreign object in turbocharger
Possible causes
Signal amp-
Fitting error
litude non ex-
istent or poor
Defective sensor Contact ABB Turbocharging service sta-
Measured
Dirty sensor tip The sensor tip is magnetic and can thus at-
speeds too
high
Measured
- -
speed too low
Other sources
- -
of errors
Variable Turbine Geometry (VTG) not adjustable
Possible causes
Turbocharger
Heavy turbine contamina-
tion
VTG bearing damaged
HZTL2464_EN
Elimination
Clean it
Contact an ABB Turbocharging
Service Station
Elimination
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.
tion.
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.
Contact ABB Turbocharging service sta-
tion.
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.
Elimination
Contact an ABB Turbocharging
Service Station
Rev.E
March 2020
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