Installation guide

2. Installation
8620-A2-GN20-50 June 2004
2-11
Using Two DC Power Sources for Power Redundancy
Procedure
✔ Make sure that the DC power source wires are not powered (that is, the circuit
breakers are open).
✔ The ends of the power source wires (14–18 AWG or 2.5 mm
2
solid or stranded
wire) must be stripped of insulation to about 1/2 inch (12.7 mm) in length
before inserting the wires into the appropriate terminal on the –48V input
terminal block.
To supply two DC power sources to the 8620 chassis for power redundancy:
1. Insert the following wires in the appropriate terminal and securely fasten each
wire by tightening the screw directly above it. The insulation should be fully
within the terminal block and no bare wire should be exposed outside of the
block.
2. Clearly label these four power source wires as –48V A, RTN A, –48V B, and
RTN B respectively.
3. Turn on power to the 8620 BAC.
4. Make sure the PWR A and PWR B LEDs on the front panel are both ON
(green).
Insert Power Source . . . Into the . . .
Negative side of the first power source
(Power Source A)
–48V A input terminal.
(Optional) Negative side of the second
power source (Power Source B)
–48V B input terminal.
Positive side of the first power source
(Power Source A)
RTN A (return) terminal.
(Optional) Positive side of the second
power source (Power Source B)
RTN B (return) terminal.
04-16896-
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MCP
8000
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Alrm
Test
TX
RX
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AC OUTLET
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SCM
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SIM
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6
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SCM-E3
10/100BT
8025
SYSTEM
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6
7
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1
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-48V RTN
A BA B