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DC Power Supply

A DC-powered router has two load-sharing, isolated DC power supplies, located at the bottom rear of the chassis, as shown in Figure 2. Each DC power supply has an internal circuit breaker. For information about power supply redundancy and replaceability, see Power System.

Figure 18 shows the power supply and Table 15 lists electrical specifications. For information about the LEDs on the power supply, see Power Supply LEDs.

Figure 18: DC Power Supply

Image g001163.gif

Table 15: Electrical Specifications for DC Power Supply

Description

Specification

Maximum power output

750 W; isolated

DC input voltage

Nominal: –48 VDC, –60 VDC

Operating range: –40.5 to –72 VDC

Note: If the input voltage from the DC power source drops below –40.5 VDC, the routing platform automatically shuts down. During automatic shutdown, the circuit remains active. When the input voltage returns to –42.75 VDC, the router automatically starts up again and the system returns to normal operation within 30 minutes. No operator intervention is required.

Input DC current rating

24 A @ –48 V

Output voltages

+2.5 V @ 50 A, +3.3 V @ 12.5 A, +5 V @ 60 A, +24 V @ 4 A, +12 V @ 0.25 A, + 5 V aux. @ 0.25 A

Note: The DC power supplies are marked –48 VDC. This is the nominal voltage associated with the battery circuit. Any higher voltages are associated only with float voltages for the charging function.

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