Schweitzer Engineering Laboratories SEL-421-4 - Table 2.9 Jumper Positions for Arc Suppression; Table 2.8 Jumper Positions for Breaker OPEN;CLOSE Indication; Table 2.7 I;O Board Jumpers

2.23
Date Code 20171021 Instruction Manual SEL-421 Relay
Installation
Jumpers
The drawout tray on which each I/O board is mounted is keyed. See Section 10:
Testing, Troubleshooting, and Maintenance in the SEL-400 Series Relays Instruc-
tion Manual.
Auxiliary TRIP/CLOSE Pushbutton and Breaker Status LED Jumpers
(Select Models Only)
The jumpers listed in Table 2.8 are used to select the proper control voltage for
breaker open/closed indicating LEDs on the front panel of the relay. Figure 2.21
shows the jumper locations on the magnetics/auxiliary pushbutton board. The
jumpers come preset from the factory with the voltage range set the same as the
control input voltage, as determined by the part number at order time.
The voltage setting can be different for each LED. To access these jumpers,
remove the relay front cover and any ribbon cables that impede accessing the
interface board, and draw out the interface board. See the instructions and pre-
cautions in the subsection Changing Serial Port Jumpers on page 2.19.
Table 2.9 shows how to enable or disable the arc suppression feature of the TRIP
and CLOSE pushbuttons. If ac control power is used to operate the breaker, then the
corresponding arc suppression jumper must be removed. If dc control power is
used to operate the breaker, then the arc suppression is strongly recommended to
break inductive loads. The arc suppression comes enabled from the factory.
Figure 2.21 shows the jumper locations on the magnetics/auxiliary pushbutton
board.
NOTE: With arc suppression enabled,
the corresponding output polarity
marks must be followed when wiring
the control.
Table 2.7 I/O Board Jumpers
I/O Board Control
Address
JMP1A/
JMP49A
a
a
INT4 I/O interface board jumper numbering.
JMP1B/
JMP49B
a
JMP2A/
JMP50A
a
JMP2B/
JMP50B
a
2XX OFF OFF OFF OFF
3XX ON OFF ON OFF
Table 2.8 Jumper Positions for Breaker OPEN/CLOSE Indication
BREAKER OPEN LED BREAKER CLOSED LED
JMP4 JMP5 JMP5 JMP3 JMP6 JMP8
24 V Installed Installed Installed Installed Installed Installed
48 V Installed Installed Not Installed Installed Installed Not Installed
110/125 V Installed Not Installed Not Installed Installed Not Installed Not Installed
220/250 V Not Installed Not Installed Not Installed Not Installed Not Installed Not Installed
Table 2.9 Jumper Positions for Arc Suppression
Option
TRIP pushbutton CLOSE pushbutton
JMP2 JMP1
Arc Suppression Enabled Installed Installed
Arc Suppression Disabled Not Installed Not Installed