2.33
Date Code 20070117
Instruction Manual
SEL-351-5, -6, -7 Relay
Installation
Circuit Board Connections
Circuit Board Connections
Accessing the Relay
Circuit Boards
To change circuit board jumpers or replace the clock battery on the relay main
board, refer to
and take the following steps:
Step 1. De-energize the relay. On Connectorized versions this can be
easily accomplished by removing the connector at rear-panel
terminals
Z25
and
Z26
.
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-351 model 0351
x
0 has only a main board. Models 0351
x
1
and 0351
x
Y have an extra I/O board below the main board.
Step 5. On Connectorized versions, remove the rear-panel connectors
that correspond to the circuit board you wish to remove by
loosening the screws on either end of each connector. Removal
of the extra I/O board also requires removal of the main board
(because the LCD on the main board is in the way).
Step 6. 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. Ribbon cables can be removed by pushing the
extraction ears away from the connector. The six-conductor
power cable can be removed by grasping the power connector
wires and pulling away from the circuit board.
Step 7. Grasp the drawout assembly of the board and pull the assembly
from the relay chassis.
Step 8. Locate the jumper(s) or battery to be changed (refer to
Step 9. Make the desired changes. Note that the output contact jumpers
are soldered in place.
Step 10. When finished, slide the drawout assembly into the relay
chassis.
Step 11. Reconnect the cables removed in
Step 12. Replace the relay front-panel cover.
Step 13. Replace any cables previously connected to serial ports.
Step 14. Replace any rear-panel connectors removed in
Step 15. Reenergize the relay.
Step 16. On Connectorized versions, replace the power connector at
rear-panel terminals
Z25
and
Z26
.
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
Summary of Contents for SEL-351-5
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