Cisco 3750 - Manual (Page 49)

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Catalyst 3750 Metro Switch Hardware Installation Guide
OL-9160-02
Chapter 3 Connecting the Power Supply
Connecting to DC Power
Wiring the DC-Input Power Source
Warning A readily accessible two-poled disconnect device must be incorporated in the fixed wiring.
Statement 1022
Warning Only trained and qualified personnel should be allowed to install, replace, or service this equipment.
Statement 1030
Warning Installation of the equipment must comply with local and national electrical codes. Statement 1074
Caution You must connect the switch only to a DC-input power source that has an input supply voltage from –36
to –72 VDC. If the supply voltage is not in this range, the switch might not operate properly or might be
damaged.
To wire the switch to a DC-input power source, follow these steps:
Step 1 Locate the terminal block plug (see Figure 3-11 ).
Figure 3-11 Terminal Block Plug
Step 2 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.
The rear panel of the power supply unit identifies the positive and negative positions for both the A and
B feed wires.
Figure 3-12 shows the positions on the power supply.
60530