4.203
Date Code 20170927 Instruction Manual SEL-751 Relay
Protection and Logic Functions
Front-Panel Settings (SET F Command)
Target LED Settings
The SEL-751 offers the following types of LEDs. See Figure 8.2 and
Figure 8.27 for the programmable LED locations:
➤ One Enable and one TRIP tricolored LEDs
➤ Six tricolored Target LEDs
➤ Sixteen tricolored Pushbutton LEDs
You can program all 22 LEDs by using SEL
OGIC control equations, the only
difference being that the Target LEDs also include a latch function.
Target LEDs
The ENABLED and TRIP LEDs are not programmable. Except for choosing
the LED illuminated color (LEDENAC or LEDTRPC), they are fixed-function
LEDs. The ENABLED LED illuminates when the SEL-751 is powered cor-
rectly, is functional, and has no self-test failures. The TRIP LED illuminates and
latches in at the rising-edge of any trip that comes from the trip logic. The
LEDENAC setting is not supported in the touchscreen display model. For
touchscreen display relays, the illuminated color of the ENABLED LED is fixed
at green.
Settings Tn_LEDL (n = 01 through 06) and Tn_LED (n = 01 through 06) con-
trol the six front-panel LEDs. With Tn_LEDL set to Y, the LEDs latch the
LED state at TRIP assertion. To reset these latched LEDs, the corresponding
LED equation must be deasserted (logical 0) and one of the following takes place:
➤ Pressing TARGET RESET on the front panel.
➤ Issuing the serial port command TAR R.
➤ The assertion of the SELOGIC control equation RSTTRGT.
With TnLEDL settings set to N, the LEDs do not latch and directly follow the
state of the associated SEL
OGIC control equation setting.
Enter any of the Relay Word bits (or combinations of Relay Word bits) as con-
ditions in the Tn_LED SEL
OGIC control equation settings. When these Relay
Word bits assert, the corresponding LED also asserts.
Table 4.98 Target LED Settings (Sheet 1 of 2)
Setting Prompt Setting Range
a
Setting Name :=
Facto r y Default
ENA_LED COLOR
b
R, G, A LEDENAC := G
TRIP_LED COLOR R, G, A LEDTRPC :=R
TRIP LATCH T_LED Y, N T01LEDL := Y
TARGET T_LED ASSERTED COLOR R, G, A T01LEDC := R
LED1 EQUATION SEL
OGIC T01_LED := ORED50T
TRIP LATCH T_LED Y, N T02LEDL := Y
TARGET T_LED ASSERTED COLOR R, G, A T02LEDC := R
LED2 EQUATION SEL
OGIC T02_LED := 51AT OR
51BT OR 51CT OR 51P1T
OR 51P2T
TRIP LATCH T_LED Y, N T03LEDL := Y
TARGET T_LED ASSERTED COLOR R, G, A T03LEDC := R
NOTE: If the LED latch setting
(TnLEDL) is set to Y, and TRIP asserts,
the LED latches to the state at TRIP
assertion. The latched LED targets can
be reset by using TARGET RESET if
the target conditions are absent.
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