Replacing Power Supplies 41
Chapter 3: Hardware and Servicing
Replacing DC Power Supplies
A DC power supply weighs about three pounds. The faceplate contains a power
LED, a power switch, a cooling fan vent, a DC power terminal block with three
connectors, a handle, two thumbscrews, and a grounding screw.
Figure 28: DC Power Supply
To connect a DC power supply to a grounding point at your site:
1. Loosen or remove the hex nut from the grounding screw by rotating the hexnut
counterclockwise.
Figure 29: Loosening the Hex Nut
WARNING: You must shut off current to the DC feed wires before connecting the
wires to the power supplies. Also, make sure that the ON/OFF switch is in the off
position.
Rotate the hexnut
counterclockwise.
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