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6.5
6.5
© Copyright 2015 ABB. All rights reserved.
Troubleshooting
Speed measurement system
Speed measurement system
Possible causes
No signal or
Fitting error
amplitude is
poor
Defective sensor Contact an ABB Turbocharging Service
Measured
Contaminated
speeds too
sensor tip
high
Measured
- -
speed too low
Other sources
- -
of errors
Operation Manual / TPS44-F.. - TPS61-F..
6
6.5
Elimination
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.
Station
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.
Contact an ABB Turbocharging Service
Station
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.
Page 84
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