2.19
Date Code 20060320 Instruction Manual SEL-311C Relay
Installation
Circuit Board Connections
Circuit Board Connections
Accessing the Relay
Circuit Boards
To change circuit board jumpers or replace the clock battery, refer to
Figure 2.16 and Figure 2.17 and take the following steps.
Step 1. De-energize the relay.
Step 2. Remove any cables connected to serial ports on the front and
rear panels.
Step 3. Loosen the six front-panel screws (they remain attached to the
front panel), and remove the relay front panel.
Each circuit board corresponds to a row of rear-panel terminal
blocks or connectors and is affixed to a drawout tray.
Step 4. Identify which drawout tray needs to be removed.
SEL-311C model 0311C00x has only a main board. Model
0311C01x has space for an extra I/O board below the main
board.
Step 5. Disconnect circuit board cables as necessary to allow the
desired board and drawout tray to be removed.
Removal of the extra I/O board requires removal of the main
board first.
a. Ribbon cables can be removed by pushing the
extraction ears away from the connector.
b. The 6-conductor power cable can be removed by
grasping the power connector wires and pulling away
from the circuit board.
Step 6. Grasp the drawout assembly of the board and pull the assembly
from the relay chassis.
Step 7. Locate the jumper(s) or battery to be changed (refer to
Figure 2.16 and Figure 2.17).
Step 8. Make the desired changes.
Note that the output contact jumpers are soldered in place.
Step 9. When finished, slide the drawout assembly into the relay
chassis.
Step 10. Reconnect the cables removed in Step 5.
Step 11. Replace the relay front-panel cover.
Step 12. Replace any cables previously connected to serial ports.
Step 13. Reenergize the relay.
The relay contains devices sensitive
to Electrostatic Discharge (ESD).
When working on the relay with the
front panel removed, work surfaces
and personnel must be properly
grounded or equipment damage may
result.
!
CAUTION
Removal of this front panel exposes
circuitry which may cause electrical
shock that can result in injury or
death.
!
DANGER
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