2-22 General Description Date Code 20010518
SEL-2020 Instruction Manual
Meets Tough IEEE & IEC Standards
The SEL-2020 is designed to meet tough IEEE and IEC electrical, environmental, and vibration
standards, making the SEL-2020 suitable for application in hostile environments such as substa-
tions and power plants, in relay and control houses, or in outdoor cabinets and enclosures.
USER-FRIENDLY FEATURES
The SEL-2020 includes the following features that make it easy to use and apply with other
devices.
Auto-Help
The SEL-2020 command set is forgiving, permitting you to enter some command strings in alter-
nate sequences. However, if you make an entry that is not valid, the SEL-2020 automatically
provides a list of acceptable commands. If part of your command is recognized, the SEL-2020
provides help by showing the proper command string format. Or you can type HELP for a com-
plete list of the available commands. For the experienced user, Auto-Help can be disabled.
COPY Command
You can use the COPY command to copy settings from one port to another. This capability can
speed the setting process where identical or very similar settings are used on multiple ports. The
command has an option to copy settings from one port to all ports, but the SEL-2020 requests
confirmation of the copy function for each port before performing the copy operation.
SWAP Command
You can use the SWAP command to swap settings between two ports. This capability may be
handy when swapping port connections between two devices.
TOGGLE Command
You can use the TOGGLE command to toggle one of the Global or Local elements. This feature
can be very helpful when testing SEL
OGIC Control Equation triggers, intermediate logic
equations, or contact outputs.
Self-Testing
The SEL-2020 continually performs a number of self-test operations to ensure that it is
functioning properly. You use the STATUS command to access results for the RAM, ROM,
EEPROM, nonvolatile Flash memory, power supply, settings, and clock battery tests. The
SEL-2020 is equipped with an alarm contact to provide an external indication of a failure.
5 Vdc on Rear Ports
An internal jumper for each port controls the availability of 5 Vdc to power an external device,
such as an external modem. The default position of the jumper is open.
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