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Operation Manual / TPS44-F.. - TPS61-F..
Troubleshooting
6
Speed measurement system
6.5
Page 84
Apr
il 20
15
H
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L24
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EN
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ev
is
ion E
Speed measurement system
6.5
Possible causes
Elimination
No signal or
amplitude is
poor
Fitting error
The screw plug for the sensor is fitted with
an additional gasket (copper ring).
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 signal-generating sealing
disc is reduced, which can lead to
amplification of the noise component and
consequently to faulty triggering.
Dismantle the sensor, clean its tip and refit
the sensor using the specified 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 recommend that you
have the speed measuring system inspected
by an ABB Turbocharging Service Station.
6.5
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