Date Code 20011026 Installation 6-1
SEL-321/321-1 Instruction Manual
SECTION 6: 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-321 Relay. This section of
the SEL-321 instruction manual includes information and procedures you should be familiar with
to install the SEL-321 Relay safely and effectively. Safe and effective installation of the
SEL-321 Relay requires proper mounting, connection, communications, and setup.
INITIAL CHECKOUT
Perform the following steps to ensure that the SEL-321 Relay operates prior to installation:
1. Visually inspect the relay for loose or damaged parts.
2. Connect and apply power to the relay (see the “PWR SUP” field on the rear-panel nameplate
for power requirements). If you do not have the proper voltage source available, use a power
supply, such as the SEL-LPS, to power the unit.
3. Verify that the front-panel LEDs and LCD back-light come on when power is applied.
4. After a couple of seconds, the EN LED should light and “EN” should be visible in the LCD
display. The ALARM contact should also operate (open). Momentarily press the TARGET
RESET button and verify that all LEDs operate. (Note: If the LCD display is not readable,
use a small slotted-tip screwdriver to adjust it via the hole near the EN LED.)
5. Connect a terminal (or computer equipped with terminal emulation software) to the front-
panel connector Port 3 of the SEL-321 Relay using an SEL-C234A cable or equivalent (see
Communication Cables in this section).
6. Set the computer terminal or emulation software to operate at:
2400 baud, 8 data bits, 1 stop bit, no parity
7. Press <ENTER> and verify that a “=” prompt is returned.
8. Type ACCESS<ENTER> to change to Access Level 1. If you enabled password protection,
enter the factory-set password by typing OTTER<ENTER> at the password prompt. You
should now have a “=>” (Level 1) prompt
9. Type STATUS<ENTER> and verify that a status report appears on your terminal. Refer to
the STATUS command in Section 3: Communications for more detailed information. This
step completes initial checkout of the SEL-321 Relay.
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