Speed Measurement System; Table 36: Speed Measurement - Poor Signal Amplitude; Table 37: Speed Measurement - Speed Too High; Table 38: Speed Measurement - Speed Too Low - ABB PT003888 Operation Manual

Operation Manual / Power2 340-H / Low-pressure stage
8 Troubleshooting / 8.5 Speed measurement system
8.5

Speed measurement system

No signal or poor signal amplitude of the speed measurement
Possible causes
Low-pres- The speed sensor was acci-
sure or dentally fitted with an addi-
high-pres- tional gasket.
sure stage An enlarged distance
between the sensor tip and
the signal-emitting sealing
disc reduces the voltage
amplitude of the speed sig-
nal.
Sensor defective
Table 36: Speed measurement – poor signal amplitude
Measured speed too high
Possible causes
Low-pres- Sensor tip contaminated,
sure or since it is magnetic and can
high-pres- attract metallic particles.
sure stage This reduces the distance to
the signal-emitting sealing
disc, which can lead to ampli-
fication of the noise com-
ponent and therefore to false
triggering.
Table 37: Speed measurement – speed too high
Measured speed too low
Possible causes
Low-pres- - -
sure or
high-pres-
sure stage
Table 38: Speed measurement – speed too low
Other causes of malfunction
If none of the measures described above remedy the malfunction, have the speed measure-
ment system checked by a Turbo Systems service station.
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Remedy
The screw plug for the sensor is fitted with an ad-
ditional gasket (copper ring).
For information regarding the disassembly and as-
sembly of the speed sensor, refer to the chapter
Replacing the speed sensor.
Install the speed sensor without the additional
gasket (copper ring).
Contact a Turbo Systems service station.
Order new speed sensor (86505) (refer to chapter
Ordering spare parts).
Replace the speed sensor.
Remedy
For information regarding the disassembly and as-
sembly of the speed sensor, refer to the chapter
Replacing the speed sensor.
Dismantle the sensor, clean the sensor tip, and fit
the sensor back on with the specified tightening
torque.
Remedy
Contact a Turbo Systems service station
HZTL4053_EN Rev.F March 2022