6.8
SEL-387-0, -5, -6 Relay Instruction Manual Date Code 20170601
Setting the Relay
Additional Relay Settings
There are 16 programmable Display Points, for creating customized messages
on the LCD display. They appear in pairs and stay on screen for two seconds
before scrolling to the next display. The variables DP1 through DP16 are
defined by a SEL
OGIC control equation that at any time will have a logical
value of 0 or 1. For each DPm there are two settings showing the display
content. These are DPm_1 and DPm_0. The relay displays any nonblank
DPm_1 or _0 values if the current logical value of DPm corresponds. The
LED and Display Point settings are Global settings, accessible with the
SET G command from a communications port.
Use local control to enable/disable schemes, trip/close breakers, and so on via
the front panel. Local control asserts (sets to logical 1) or deasserts (sets to
logical 0) local bits LB1 through LB16. These local bits are available as Relay
Word bits and are used in SEL
OGIC control equations.
For more information on the LEDs, Display Points, and Local Bits, see
Section 8: Front-Panel Interface.
Sequential Events
Recorder
The SER, or Sequential Events Recorder, lists up to 512 events. This can help
the user in determining the correct order of operation during a complicated
event with multiple device operations within a short time interval. The settings
for the SER are the trigger conditions and the Relay Word bit ALIAS names.
Up to 96 total Relay Word bit names can be selected and entered into settings
SER1, SER2, SER3, and SER4, in any order, with a maximum of 24 bits in
any SERn. Up to 20 Relay Word bits can be given ALIAS names to make the
SER report more user friendly. For example, a given input can be given an
ALIAS that designates a 52a input for a specific named breaker.
The SER settings are made after issuing the SET R command from a
communications port. The SER operation and settings are described fully in
Section 9: Event Reports and SER.
Communications
Ports
There are four communications ports on the SEL-387. Port 1 is an EIA-485
port on the rear panel. Ports 2 and 3, also on the rear panel, are EIA-232.
Port 4 is an EIA-232 on the front panel. These ports are set via the SET P
command. To identify the port by which one is presently communicating with
the relay, issue the SHO P command, which lists settings for that port.
Initial connection to the relay can be made with standard SEL protocol, at
2400 baud, 8 data bits, No parity, 1 stop bit, and VT100 emulation, using any
standard communications program such as Microsoft
®
Windows
®
95
HyperTerminal
®
.
Complete information on the communications ports and necessary settings
can be found in Section 7: Serial Port Communications and Commands.
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