ABB Relion 620 Series - Page 1181

13.4.7.1 COM0001-COM0014 jumper locations and connections
X4
X6
X5
X8
X9
X7
1 2 3
Figure 631: Jumper connectors on communication module
Table 1069: 2-wire EIA-485 jumper connectors
Group Jumper connection Description Notes
X4 1-2 A+ bias enabled
COM2
2-wire connection
2-3 A+ bias disabled
X5 1-2 B- bias enabled
2-3 B- bias disabled
X6 1-2 Bus termination ena-
bled
2-3 Bus termination disa-
bled
Table continues on the next page
1MRS757644 H IED physical connections
620 series
Technical Manual
1181