DATA-LINC
Appendix B
Line Conditioning
LCM100 User’s Guide
In some industrial installations, power lines must be conditioned to prevent the FSK signal from being shunted by distributed capacitance possibly associated with other loads connected to the line. Motors and transformers, for example, may have very high distributed capacitance.
Adequate communication in such circumstances may require: 1) installation of signal couplers at the power distribution panel to provide a low impedance path between different hot lines; 2) isolation of noisy equipment or equipment that presents a low impedance to high frequency signals, such as some power line filters commonly used with computer equipment.
Signal Couplers
One signal coupler is sufficient for all
DTE | DCE |
FSK
A Phase
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Signal |
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Coupler |
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B Phase
Signal
Coupler
C Phase | FSK |
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Neutral
Figure 4: Signal Coupler in Three Phase Systems
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