Date Code 20010518 Installation 3-1
SEL-2020 Instruction Manual
SECTION 3: INSTALLATION
INTRODUCTION
Planning should be the first step you take before installing any new device, and it is equally
essential to ensure successful installation and operation of the SEL-2020 Communications
Processor. This section of the SEL-2020 instruction manual includes information and procedures
you should be familiar with to install the SEL-2020 safely and effectively. Safe and effective
installation of the SEL-2020 requires proper mounting, connection, communications, and setup.
The instructions in this section assume that you have successfully performed the initial checkout
on the SEL-2020 and that you can install the SEL-2020 per the specifications, both as described
in Section 1: Introduction.
MOUNTING AND CONNECTIONS
This subsection provides details about the physical mounting and connection requirements for
the SEL-2020 Communication Processor.
Mounting
The SEL-2020 Communications Processor is designed to be permanently mounted in a dry,
indoor location. The SEL-2020 chassis includes reversible flanges that permit the unit to be
flush mounted or projection mounted in a 19-inch relay rack or on a switchboard panel. The
SEL-2020 can be mounted horizontally or vertically, although the front and rear panel stencils
are designed to be read with the unit mounted horizontally. Use four #10 screws for mounting.
Front and rear panel drawings, mounting dimensions, and drilling details are included in the
SEL-2020 Data Sheet in Section 1: Introduction.
Frame Ground Connection
You must connect the grounding terminal labeled “GND” on the rear panel to a frame ground for
proper safety and performance. This terminal connects directly to the internal chassis ground of
the instrument.
Power Connections
The terminals labeled “POWER” on the rear panel must be connected to a power source that
matches the power supply (POW SUP) characteristics specified on the rear panel nameplate of
your SEL-2020. If you provide a dc power source, you must connect the source with the proper
polarity as indicated by the “+” and “−” labels on the power terminals. The SEL-2020 internal
power supply has very low power consumption and a wide voltage tolerance. See the
specifications in Section 1: Introduction for complete power supply information.
Alarm Contact Connection
The SEL-2020 includes an alarm output contact connected to terminals Z01 and Z02 labeled
“ALARM” on the rear panel. At the factory, the alarm contact is configured to be closed for an
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