Checking The Line Of Communication; Return Loss - ABB ETL600 Instruction Manual

ETL600
P4LT/P4LU
DANGER
R1BC
DANGER
O4LE
DANGER
G4AI
DANGER
7.2.

Checking the line of communication

It is essential that the behavior and characteristics of the line of
communication between the sets of PLC terminal equipment be
checked prior to finally commissioning. This is necessary to confirm
the design criteria used for engineering the system, respectively if the
criteria were inaccurate, to take the appropriate corrective action.
The line of communication comprises:
a) the coaxial cable linking the PLC equipment with the coupling
device.
b) the coupling device between the remote end of the coaxial cable
and the LV side of the coupling capacitor. The coupling device
includes the main coupling filter and protective devices.
c) the line traps in the power line between the junction of the coupling
capacitor with the power line and the substation.
d) the HV power line itself as propagation medium.
7.2.1.

Return loss

The return loss is a measure of the quality of impedance matching
between the PLC transmitter and the load (input impedance of the
coaxial cable).
Commissioning
1KHW001489-EN
Hazardous voltages and/or hazardous energy level
on the module and the cable.
Do not touch the module and the cable leads.
Hazardous voltages and/or hazardous energy level
on the module and the cable.
Do not touch the module and the cable leads
The phone interface on the module O4LE generates
dangerous voltage up to 100 V. Don't operate the
module without upper and lower cover plate. Do not
touch the open pins of the service phone connector,
the leads of its cable, the pins of the external cable
connector and the leads of the external cable.
Hazardous voltages and/or hazardous energy level
on the module and the cable.
Do not touch the module and the cable leads.
ABB Switzerland Ltd
November 2005 7-3