This product requires short-circuit (overcurrent) protection, to be provided as part of the building installation.
Install only in accordance with national and local wiring regulations. Statement 1045
Warning
Guidelines for DC-Powered Systems
Basic guidelines for DC-powered systems include the following:
• Each chassis power supply has its own dedicated input power source. The source must comply with the
safety extra-low voltage (SELV) requirements in the UL 60950, CSA 60950, EN 60950, and IEC 60950
standards.
• Protect the circuit by a dedicated two-pole circuit breaker. Ensure that the circuit breaker is sized according
to the power supply input rating and local or national code requirements.
• The circuit breaker is considered as the disconnect device and is easily accessible.
• The system ground is the power supply and chassis ground.
• Use the grounding lug to attach a wrist strap for ESD protection during servicing.
• Do not connect the DC return wire to the system frame or to the system-grounding equipment.
• Ensure that the DC return is grounded at the source side.
Guidelines for AC-Powered Systems
Basic guidelines for AC-powered systems include the following:
• Each chassis power supply has its own dedicated branch circuit.
• Ensure that the circuit breaker is sized according to the power supply input rating and local or national
code requirements.
• The AC power receptacles that are used to plug in the chassis must be the grounding type. The grounding
conductors that connect to the receptacles must connect to protective earth ground at the service equipment.
Prevent Power Loss
Use the following guidelines to prevent power loss to the device:
• To prevent input power loss, ensure that the maximum load on each circuit supplying the power is within
the current ratings of the wiring and breakers.
• In some systems, you can use an UPS to protect against power failures at your site. Avoid UPS types
that use ferroresonant technology. These UPS types can become unstable with systems such as the device,
which can have substantial current-draw fluctuations due to bursty data traffic patterns.
Determining power requirements is useful for planning the power distribution system to support the device.
Activate DC Power Supply
SUMMARY STEPS
1. Remove the tape from the circuit-breaker device handle, and restore power by moving the circuit-breaker
device handle to the On (|) position.
2. Verify the power supply operation by ascertaining that the front panel LED is green.
Installing the Cisco ASR 920 Series Router
24
Installing the Cisco ASR 920 Series Router
Guidelines for DC-Powered Systems
To Next Page
Loading...
Need help?
General
