8-2
Front-Panel Interface
Date Code 20020129
SEL-387E Instruction Manual
precedence over the normal default display. The
<EXIT>
button returns the display to the
default display, if some other front-panel function is being performed.
Error messages such as self-test failures are displayed on the LCD in place of the default display
when they occur. Do not power down the relay if this happens, but refer to
Section 10: Testing
and Troubleshooting
for further instructions.
During power up the LCD displays “Initializing.” It will then scroll through the winding current
and voltage displays until the relay is again enabled. When the EN LED indicates the relay is
enabled, the active Display Points will be scrolled.
Menu choices on the LCD are listed horizontally on the second line. The first character of the
menu choice is underlined. The left and right arrow buttons move the underline to the adjacent
menu selection. Once the underline indicates your selection, use the
<SELECT>
button to
proceed.
Target LEDs
The target LEDs are an indication of what the relay has detected on the power system and how
the relay has reacted. The front-panel legend gives a brief description of each target.
Section 4:
Control Logic
describes each target LED in detail.
The only times the target LEDs do not illuminate according to their labels are when (1) the user
has reprogrammed LEDA, LEDB, or LEDC to respond to a SEL
OGIC
®
control equation, or (2)
the
TAR F
command is issued through one of the serial ports. The
TAR F
command remaps the
second row of LEDs to follow a particular row in the Relay Word bits, such that assertion of a
Relay Word bit will light the corresponding LED position. Refer to
Section 7: Serial Port
Communications and Commands
for a complete description of the
TAR F
command.
The states of the 12 dedicated LEDs (all but EN, A, B, C) are stored in nonvolatile memory. If
the power is lost to the relay, these 12 targets will be restored to their last state when power is
restored. EN responds only to internal self-test routines, while A, B, and C respond to the
present state of their GLOBAL settings, which are SEL
OGIC
control equations.
Password Access
Commands that are at Access Level 2 (2AC) or the Breaker Access Level (BAC) are password
protected from the front panel. Access Level 1 commands have no password protection. The
front panel normally is active at Access Level 1. If you issue a command from the front panel
that requires a Level B or Level 2 password, the relay prompts you for a password. After you
enter the password for the higher access level, you remain at that access level only until the front
panel times out from inactivity or you EXIT from the specific command. When you EXIT the
command, the front panel returns to Access Level 1.
If the password jumper, JMP6A, is installed, there is no password protection, and you will not be
prompted for a password. If a particular level password has been disabled with serial port
command
PAS n DISABLE<ENTER>
, you will not be prompted for a password.
When prompted for a password, enter the BAC or 2AC password, depending on the requirements
of the command. All commands are available using the 2AC password. The front-panel request
for password shows a display of six characters, shown initially as ABCDEF, with the A
