ABB RELION 620 Series Technical Manual page 908

Section 14
Protection relay's physical connections
902
Group Jumper connection
X9 1–2
2–3
X8 1–2
2–3
X11 1–2
2–3
1) Default setting
COM2 port connection can be either EIA-485 or optical ST. Connection type is selected
by setting jumpers X27 and X28.
Table 630: COM2 serial connection X5 EIA-485/ X12 Optical ST
Group
X27
X28
Table 631: 2-wire EIA-485 jumper connectors for COM2
Group
X13
X14
X15
Table 632: 2-wire EIA-485 jumper connectors for COM2
Group Jumper connection
X13 1–2
2–3
X14 1–2
2–3
X15 1–2
2–3
X16 1–2
2–3
X17 1–2
2–3
X18 1–2
2–3
Description
A+ bias enabled
A+ bias disabled
B- bias enabled
B- bias disabled
Bus termination enabled
Bus termination disabled
Jumper connection
1–2
2–3
1–2
2–3
Jumper connection
1–2
2–3
1–2
2–3
1–2
2–3
Description
A+ bias enabled
A+ bias disabled
B- bias enabled
B- bias disabled
Bus termination enabled
Bus termination disabled
B- bias enabled
B- bias disabled
A+ bias enabled
A+ bias disabled
Bus termination enabled
Bus termination disabled
1MAC504801-IB E
Notes
4-wire RX channel
Description
EIA-485
Optical ST
EIA-485
Optical ST
Description
A+ bias enabled
A+ bias disabled
B- bias enabled
B- bias disabled
Bus termination enabled
Bus termination disabled
Notes
COM2
4-wire TX channel
4-wire RX channel
620 series ANSI
Technical Manual