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Operation Manual / Power2 850-M / 4 Product description
4 Monitoring during operation / 4.3 Speed measurement
© Copyright 2019 ABB. All rights reserved.
HZTL4061_EN
Rev.B
June 2019
4.3
Speed measurement
4.3.1
Introduction
Speed measurement systems enable the constant monitoring of the speeds of the low-pres-
sure and the high-pressure stage.
4.3.2
Layout and functional principle
Fig. 11: 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 strain cables
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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