2.17
Date Code 20171021 Instruction Manual SEL-421 Relay
Installation
Jumpers
The password disable jumper, PASSWORD, is for temporary or emergency sus-
pension of the relay password protection mechanisms. Under no circumstance
should you install PASSWORD on a long-term basis. The SEL-421 ships with
password disable jumper PASSWORD OFF (passwords enabled).
The circuit breaker control enable jumper, BREAKER, supervises the CLOSE n
command, the OPEN n command, the PULSE OUTnnn command, and front-
panel local bit control. To use these functions, you must install Jumper
BREAKER. The relay checks the status of the circuit breaker control jumper
when you issue CLOSE n, OPEN n, PULSE OUTnnn, and when you use the
front panel to close or open circuit breakers, control a local bit, or pulse an out-
put. The SEL-421 ships with circuit breaker Jumper BREAKER OFF. For com-
missioning and testing of the SEL-421 contact outputs, it may be convenient to
set BREAKER ON, so that the PULSE OUTnnn commands can be used to
check output wiring. BREAKER must also be set ON if SCADA control of the
circuit breaker via Fast Operate is required, or if the
LOCAL CONTROL > BREAKER
CONTROL
screens are going to be used.
BREAKER Front OFF Disable circuit breaker com-
mands
(OPEN and CLOSE) and out-
put PULSE commands
b
(shipped position)
ON Enable circuit breaker com-
mands (OPEN and CLOSE)
and output PULSE commands
b
D Front OFF For SEL use only
a
ON is the jumper shorting both pins of the jumper. Place the jumper over one pin only for OFF.
b
Also affects the availability of the Fast Operate Breaker Control Messages and the front-panel
LOCAL CONTROL > BREAKER CONTROL, and front-panel LOCAL CONTROL > OUTPUT
TESTING
screens.
Table 2.5 Main Board Jumpers (Sheet 2 of 2)
Jumper Jumper Location Jumper Position
a
Function
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