Operation Manual / Power2 550-M / High-pressure stage
8 Troubleshooting / 8.5 Speed measurement system
© Copyright 2022 ABB. All rights reserved.
HZTL4058_EN
Rev.F
March 2022
8.5
Speed measurement system
No signal or poor signal amplitude of the speed measurement
Possible causes
Remedy
Low-pres-
sure or
high-pres-
sure stage
The speed sensor was acci-
dentally fitted with an addi-
tional gasket.
An enlarged distance
between the sensor tip and
the signal-emitting sealing
disc reduces the voltage
amplitude of the speed sig-
nal.
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).
Sensor defective
Contact a Turbo Systems service station.
Order new speed sensor (86505) (refer to chapter
Ordering spare parts).
Replace the speed sensor.
Table 39: Speed measurement – poor signal amplitude
Measured speed too high
Possible causes
Remedy
Low-pres-
sure or
high-pres-
sure stage
Sensor tip contaminated,
since it is magnetic and can
attract metallic particles.
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.
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.
Table 40: Speed measurement – speed too high
Measured speed too low
Possible causes
Remedy
Low-pres-
sure or
high-pres-
sure stage
- -
Contact a Turbo Systems service station
Table 41: 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.
Page
74
/
119