Operation Manual / Power2 800-M / 4 Product description
4
Monitoring during operation
Page 19 / 59
© Copyright 2016 ABB. All rights reserved.
HZTL4061_EN
Revision A
September 2016
4.3
Speed measurement
4.3.1
Introduction
Speed measurement systems enable the constant monitoring of the speeds of the low-
pressure and the high-pressure stage.
4.3.2
Layout and functional principle
Figure 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 princi-
ple, and is installed in a radial direction in relation to the compressor wheel. The electronics
must be provided with a power supply, and deliver a square pulse signal. The signal frequency
depends on the number of main blades on the compressor wheel. The signal amplitude de-
pends 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.
Do not strain the speed measurement cables by pulling.
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