8.15
Date Code 20081022 Instruction Manual SEL-787 Relay
Front-Panel Operations
Operation and Target LEDs
Table 8.4 SEL-787 Front-Panel Operator Control Functions
Continually press the {LOCK} operator control pushbutton for three (3) seconds to engage/
disengage the lock function (Latch LT01 functions as Lock with the latch in reset state
equivalent to the engaged lock). While this pushbutton is pressed, the corresponding LED
flashes on and off, indicating a pending engagement or disengagement of the lock
function. The LED illuminates constantly to indicate the engaged state. While the lock
function is engaged, the following operator control is “locked in position” (assuming
factory default settings): {CLOSE}.
While “locked in position,” this operator control cannot change state if pressed—the
corresponding LEDs remain in the same state. When the lock function is engaged, the
{CLOSE} operator control cannot close breaker 1 or 2, but the {TRIP} operator control can
still trip breaker 1 or 2.
Press the {SELECT} pushbutton to select breaker 1 or breaker 2. If breaker 1 is selected,
BRKR1 LED is on and if breaker 2 is selected, BRKR2 LED is on. The {SELECT} pushbutton
allows a breaker selection before {CLOSE} or {TRIP} pushbuttons are used.
Press the {CLOSE} operator control pushbutton to close the selected breaker.
Corresponding BRKR CLOSED LED illuminates to indicate the breaker is closed.
Option: Set a delay, so the operator can press the {CLOSE} operator control pushbutton
and then move a safe distance away from the breaker before the SEL-787 issues a
close (the {CLOSE} operator control comes with no set delay in the factory settings).
With a set delay, press the {CLOSE} operator control pushbutton momentarily, and
notice that the corresponding BRKR CLOSED LED flashes on and off during the delay
time, indicating a pending close. Abort the pending close by pressing the {CLOSE}
operator control pushbutton again or by pressing the {TRIP} operator control
pushbutton. This delay setting for the {CLOSE} operator control is SV03PU (range: 0 to
3000 seconds; factory set at 0—no delay). The delay is set via the SET L command.
See Table 4.29 for more information.
Press the {TRIP} operator control pushbutton to trip the selected breaker (and take the
control to the lockout state). Corresponding BRKR OPEN LED illuminates to indicate the
breaker is open.
Option: Set a delay, so the operator can press the {TRIP} operator control pushbutton
and then move a safe distance away from the breaker before the SEL-787 issues a trip
(the {TRIP} operator control comes with no set delay in the factory settings). With a set
delay, press the {TRIP} operator control pushbutton momentarily and notice the
corresponding BRKR OPEN LED flashes on and off during the delay time, indicating a
pending trip. Abort the pending trip by pressing the {TRIP} operator control
pushbutton again or by pressing the {CLOSE} operator control pushbutton. This delay
setting for the {TRIP} operator control is SV04PU (range: 0 to 3000 seconds; factory-
set at 0—no delay). The delay is set via the SET L command. See Table 4.29
for
more information.
ENABLED
LOCK
DISABLED
BRKR 1
SELECT
BRKR 2
BRKR 1 CLOSED
CLOSE
BRKR 2 CLOSED
BRKR 1 OPEN
TRIP
BRKR 2 OPEN
To Next Page
Loading...
