Date Code 20011026 Installation 6-11
SEL-321/321-1 Instruction Manual
2. Remove the screws attaching the front panel and top cover and remove the front panel and
top cover. (Note: The top cover does not need to be removed to access the main board
jumpers.) Be careful of the cables attaching the front-panel board to the main board.
CAUTION
!
The relay contains devices sensitive to Electrostatic Discharge (ESD).
When working on the relay with front or top cover removed, work
surfaces and personnel must be properly grounded or equipment
damage may result.
3. If an I/O board requires changes, disconnect as many cables as necessary so that the I/O
board can be removed. Release the I/O board by pulling out the white release clamps at the
corners and then slide the board forward and out.
Set Jumpers
See Appendix B for main board jumper locations. Configure the following main board jumpers
according to the selections you have made:
• OPEN/CLOSE Command Enable/Disable jumper.
• Password Enable/Disable jumper.
See Appendix I for I/O board jumper locations and positions. While the I/O board is removed,
configure the following jumpers according to the selections you have made:
• Select output contact form: A or B (Note: most boards have a jumper for each output).
Reassemble the SEL-321 Relay
After configuring jumpers, reassemble the SEL-321 Relay as follows:
1. If you removed an I/O board, replace it.
2. Reconnect any cables that were disconnected between the I/O board and the other board(s).
3. Replace the top cover and top-cover screws and tighten them securely.
4. Replace the front panel and front-panel screws and tighten them securely. Once again, be
careful of the cables attaching the front-panel board to the main board. Ensure that they are
fully engaged and that they do not get pinched during reassembly.
5. Re-energize the relay and ensure that it powers up as expected.
INSTALLATION
Before you install the SEL-321 Relay, you should perform the initial checkout procedure found
earlier in this section, and set the configuration jumpers according to your installation
requirements per the instructions outlined earlier in this section. Install the SEL-321 Relay
according to the following step-by-step instructions:
1. Mount the SEL-321 Relay in the desired panel location. Mounting information, including
chassis, cutout and drilling dimensions are shown in Figure 6.13 through Figure 6.14.
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