3
Optional Expanded Long-Term Information Storage
Long-term information storage, for such functions as alarms, event reports, and load profiles, can
be accommodated using optional nonvolatile archive memory.
Optional Input/Output
Optional I/O, consisting of four programmable output contacts and 16 optoisolated inputs, is
available for monitoring and control. You can use SEL
OGIC control equations, written in the
SEL-2020 settings, to perform basic control functions such as consolidating alarms and switching
adaptive relay setting groups. Jumper configure each output contact as form A or form B through
soldered jumper connections. Jumper configure each input with board-level jumper connections,
to accept one of three control input voltage ranges, 30-60 Vdc, 80-150 Vdc, or 150-300 Vdc.
Optional Internal Modem
An optional internal modem is also available for the SEL-2020 to reduce external wiring and
connections. Whether external or internal, you can use any modem connected to the SEL-2020 to
remotely communicate with or through the SEL-2020 to attached devices. Use any
telecommunications software that supports ASCII dumb terminal emulation to communicate with
and through the SEL-2020; no proprietary software is needed unless it is required by non-SEL
IEDs. You can program each SEL-2020 port that is connected to a modem to dial out through the
modem to deliver messages, event reports, and other information to computers at remote
locations.
Compact Design
The SEL-2020 is available with two mounting styles; one is for mounting in panels and one is for
mounting in racks. You can reverse the mounting ears on the rack-mount case for projection
mounting. Figure 2 shows the SEL-2020 front and rear panels, both with and without the
optional I/O board. Refer to Figure 5 for dimensions and rack-mount drill plan, and Figure 6 for
panel-mount cutout and drill plan.
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