Operation Manual / TPS44-F.. - TPS61-F..
6 Troubleshooting / 6.5 Speed measurement system
© Copyright 2020 . All rights reserved. HZTL2412_EN Rev.G March 2020
6.5 Speed measurement system
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 in-
creases. As a result, the voltage amplitude
of the speed signal decreases, which can
cause problems for the evaluation elec-
tronics.
This problem is eliminated by removing
the gasket.
Defective sensor Contact an ABB Turbocharging Service Sta-
tion
Measured
speeds too
high
Contaminated
sensor tip
The sensor tip is magnetic and can thus at-
tract metal particles. As a result, the dis-
tance 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 Sta-
tion
Other sources
of errors
- - If none of the above measures eliminates
the malfunction, we recommend that you
have the speed measuring system inspec-
ted by an ABB Turbocharging Service Sta-
tion.
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