ABB Relion 670 Series Application Manual page 96

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Table of Contents

Section 5

Communication set-up

Test 2 to Test n: loop back RX+ to TX+ and RX- to TX-. Loop back, one-by-one, in respective

interface in the communication network. Check that the communication status is OK for each

interface point on the local HMI. If no fault is found, Test 1 and Test 2 should be repeated in

reverse order from the remote end.

When loop-back testing is finished, remember to restore the original terminal

numbers. Having the same terminal number at both ends can cause an

unwanted trip. If the terminal was set to Test mode, check that the local trip is

reset before leaving the Test mode

1MRK 505 382-UEN E

Communication set-up, 670/650 series

Application Guide

Table of Contents

Relion 650 series