ABB Relion 620 Series - Page 1187

Group Jumper connection Description Notes
X8
1-2
2-3
B- bias enabled
B- bias disabled
1
X11
1-2
2-3
Bus termination ena-
bled
Bus termination disa-
bled
1
COM2 port connection can be either EIA-485 or optical ST. Connection type is
selected by setting jumpers X27 and X28.
Table 1076: COM2 serial connection X5 EIA-485/ X12 Optical ST
Group Jumper connection Description
X27
1-2
2-3
EIA-485
Optical ST
X28
1-2
2-3
EIA-485
Optical ST
Table 1077: 2-wire EIA-485 jumper connectors for COM2
Group Jumper connection Description
X13
1-2
2-3
A+ bias enabled
A+ bias disabled
X14
1-2
2-3
B- bias enabled
B- bias disabled
X15
1-2
2-3
Bus termination enabled
Bus termination disabled
Table 1078: 4-wire EIA-485 jumper connectors for COM2
Group Jumper connection Description Notes
X13
1-2
2-3
A+ bias enabled
A+ bias disabled
COM2
4-wire TX channel
X14
1-2
2-3
B- bias enabled
B- bias disabled
X15
1-2
2-3
Bus termination ena-
bled
Bus termination disa-
bled
Table continues on the next page
1MRS757644 H IED physical connections
620 series
Technical Manual
1187