3-12
Installation
Date Code 20010518
SEL-2020 Instruction Manual
Open the SEL-2020 to Access Internal Jumpers
After you have decided on the appropriate SEL-2020 hardware configuration, you are ready to
reconfigure the SEL-2020 if the default configuration does not meet your needs. Perform the
following steps to gain access to internal jumpers:
1. De-energize the SEL-2020.
CAUTION
!
Never work on the SEL-2020 with the front or top cover
removed, when the SEL-2020 is energized.
2. Remove the screws attaching the front panel and top cover and remove the front panel and
top cover.
CAUTION
!
The SEL-2020 contains devices sensitive to electrostatic
discharge (ESD). When working on the device with front or top
cover removed, work surfaces and personnel must be properly
grounded or equipment damage may result.
3. If the optional I/O board is installed, disconnect any cables joining the I/O board to the main
board.
4. Remove the I/O board temporarily by sliding it forward and out.
Set Jumpers
See Figure 3.2 for main board jumper locations. Configure the following main board jumpers
according to the selections you have made:
•
Modulated or demodulated IRIG-B input.
•
Alarm contact form: A or B.
•
Serial port +5 Vdc power output for each rear port.
•
Port F baud rate jumper.
•
Password disable jumper.
See Figure 3.3 for I/O board jumper locations. While the I/O board is removed, configure the
following jumpers according to the selections you have made:
•
Configure I/O board inputs for 48 Vdc, 125 Vdc, or 250 Vdc.
•
Select output contact form: A or B.
Reassemble the SEL-2020
After configuring jumpers, reassemble the SEL-2020 as follows:
1. If you removed an optional I/O board, replace it.
2. Reconnect any cables that were disconnected between the I/O board and the main board.
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