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Cisco 8500 Series Wireless Controller Installation Guide
Chapter 1 Cisco 8500 Series Wireless Controller Installation Guide
Replacing a Hot-Swap -48 VDC Power Supply
• Connect the equipment to a properly grounded safety extra low voltage (SELV) source. A SELV
source is a secondary circuit that is designed so that normal and single fault conditions do not cause
the voltages to exceed a safe level (60 V direct current).
• Incorporate a readily available approved and rated disconnect device in the field wiring.
• See the specifications in the product documentation for the required circuit-breaker rating for branch
circuit overcurrent protection.
• Use copper wire conductors only.
• See the specifications in the product documentation for the required torque values for the
wiring-terminal screws.
Safety Information
To install the DC power supply, complete the following steps:
Step 1 If the controller is operating, turn off the server and peripheral devices.
Step 2 Turn off the circuit breaker for the DC power source to which the new power supply will be connected.
Disconnect the power cord from the DC power source.
Step 3 Attach the DC power cable to the new power supply.