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C-8
Cisco ME 3400 Ethernet Access Switch Hardware Installation Guide
OL-7677-04
Appendix C Connecting to DC Power
Wiring the DC-Input Power Source
Warning
Only trained and qualified personnel should be allowed to install or replace this equipment.
Statement 1030
Caution You must connect the Cisco ME DC switch only to a DC-input power source with –36 to –72 VDC
supply voltage. If the supply voltage is not in this range, the switch might not operate properly or might
be damaged.
Caution The Cisco ME 3400G-12CS-DC switch has two DC power supplies. They are labelled PS1 and PS2, and
each power supply has an A and B input. When you connect power to both PS 1 and PS 2, connect only
a single input (A or B) to each power supply.
To wire the switch to a DC-input power source, follow these steps:
Step 1 To ensure that all power is OFF, locate the circuit breaker on the panel board that services the DC circuit,
switch the circuit breaker to the OFF position, and tape the switch handle of the circuit breaker in the
OFF position.
Step 2 Locate the terminal block plug (see Figure C-8).
Figure C-8 Terminal Block Plug
Step 3
Identify the positive and negative feed positions for the terminal block connection. The wiring sequence
is positive to positive and negative to negative for both the A and the B feed wires.
60530