Speed Measurement System - ABB HT571908 Operation Manual

6.5
6.5
© Copyright 2016 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 Sta-
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.
tion
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.
Contact an ABB Turbocharging Service Sta-
tion
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