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2. Installation
8620-A2-GN20-40 July 2003
2-13
Using AC Power with DC Power Backup
Procedure
✔ Make sure that the DC power source wires are not powered (i.e., the circuit
breakers are open).
✔ The ends of the DC power source wires (14–18 AWG solid or stranded wire)
must be stripped of insulation. If they are not stripped of insulation, strip the tip
of each wire (about 1/2 inch or 12.7 mm in length) before plugging the wire
into the appropriate connector on the –48V input terminal block. Ensure that
each wire is fully inserted into the terminal (until it can go no further).
To supply both AC and DC power to the 8620 chassis for power redundancy:
1. Plug the AC power cord into the IEC 320 receptacle labeled AC INPUT ( ).
2. Insert the wires for the DC power source into Terminal B and securely fasten
each wire by tightening the screw above it. The insulation should be fully
within the terminal block and no bare wire should be exposed outside of the
block.
NOTE:
You should clearly label these power source wires as –48V and RTN
respectively.
3. Plug the other end of the AC power cord into the AC outlet.
4. Power the DC connections.
5. Make sure the PWR A and PWR B LEDs on the front panel are both ON
(green).
Insert Power Source B’s . . . Into the . . .
Negative side –48V B input terminal.
Positive side RTN B (return) terminal.
MCP
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SCM-E3
10/100BT
8025
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00-16898
DC FUSES
A
B
-48V RTN
ABAB
AB
DC
POWER
SYSTEM
OK
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ETHERNET
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