Operation Manual / Power2 850-M / High-pressure stage
5 Monitoring during operation / 5.3 Speed measurement
© Copyright 2022 ABB. All rights reserved.
HZTL4063_EN
Rev.F
March 2022
5.3
Speed measurement
5.3.1
Introduction
Speed measurement systems enable the constant monitoring of the speeds of the low-pres-
sure and the high-pressure stage.
5.3.2
Layout and function
Fig. 15: Functional principle
01
Speed sensor
02 Cable
03 Casing flange
04 Electronics
05 Cable
06 Plug
The speed measurement system consists of a sensor (01) with integrated cables (02, 05), an
electronic unit (04) and a plug (06). The sensor operates according to the eddy current prin-
ciple, and is installed in a radial direction in relation to the compressor wheel. The electron-
ics must be provided with a power supply, and deliver a square pulse signal. The signal fre-
quency depends on the number of main blades on the compressor wheel. The signal amp-
litude depends on the level of the feed voltage.
CAUTION
Do not put the speed measurement cables under strain by pulling them
If you pull the speed measurement cables too hard, contacts can be pulled
out.
u
Do not strain the speed measurement cables by pulling.
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Summary of Contents for PT004165
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