8.17
Date Code 20170927 Instruction Manual SEL-751 Relay
Front-Panel Operations
Two-Line Display Front Panel
Press the CLOSE operator control pushbutton to close the breaker. Corresponding BREAKER
CLOSED LED illuminates to indicate that the breaker is closed.
Option: Set a delay, so that the operator can press the CLOSE operator control pushbutton
and then move a safe distance away from the breaker before the SEL-751 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 cor-
responding BREAKER CLOSED LED flashes on and off during the delay time, indicating a
pending close. Abort the pending close by pressing the CLOSE operator control pushbut-
ton 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 4.56 for more information.
Press the TRIP operator control pushbutton to trip the breaker (and take the control to the
lockout state). Corresponding BREAKER OPEN LED illuminates to indicate the breaker is open.
Option: Set a delay, so that the operator can press the TRIP operator control pushbutton
and then move a safe distance away from the breaker before the SEL-751 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 that the corre-
sponding BREAKER OPEN LED flashes on and off during the delay time, indicating a pend-
ing 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 opera-
tor 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 4.56 for more information.
Table 8.4 SEL-751 Front-Panel Operator Control Functions (Sheet 2 of 2)
BLOCK CLOSE
BREAKER
CLOSED
CLOSE
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