Special Considerations For The 1400 W Dc Sp Triple Input Power Supply - Cisco Catalyst 4500 Series Configuration Manual

Chapter 12 Environmental Monitoring and Power Management
Command
Step 2
Switch(config)# power dc input watts
Step 3
Switch(config)# end
The same configuration is applied to both power slots. For example, if you set the dc power input to
1000 W, the switch expects 1000 W as the external DC source for both slot 1and slot 2 (if present).
The following example shows how to set the external DC power source to 1000 W:
Switch# configure terminal
Switch (config)# power dc input 1000
Switch (config)# end
Switch#
If you use the 1400 W DC SP power supply in combined mode, the inputs do not have to match.

Special Considerations for the 1400 W DC SP Triple Input Power Supply

Unlike the 1400 W DC power supply, the 1400 W DC SP power supply has submodules (multiple inputs)
that can be powered on or off. With Cisco IOS Release 12.2(25)EW, the output of the
show power command is modified to display the status of these submodules:
Switch# show power
Power
Supply
------
PS1
PS1-1
PS1-2
PS1-3
PS2
Observer the following guidelines when using a 1400 W DC SP power supply with your Catalyst 4500
series switch:
•
•
In a matched redundant power supply configuration, if a power supply submodule fails, the other (good)
power supply provides power to its full capability.
Powering Down a Module
If your system does not have enough power for all modules installed in the switch, you can power down
a module, and place it in low-power mode. To power down a module, perform this task:
OL-25340-01
Model No Type
---------------- ---------
PWR-C45-1400DC DCSP1400W
12.5A
15.0A
15.0A
none --
When you use two 48 V power rails to drive two power supplies, you might use cross-wiring to
connect the power supplies (to rails) to minimize the inrush current drawn during an initial power
up. In this situation, you should configure the switch in combined mode before you take a rail down
for maintenance.
Ordinarily, when configured for redundancy, two power supplies must be matched (have identical
inputs). For example, you might provide power to inputs 1 and 3 on both PS1 and PS2. If power
supplies are mismatched upon bootup, the right (second) power supply is in err-disable state.
Purpose
Sets the capacity of the DC input source.
Exits configuration mode.
Fan
Status Sensor
----------- -------
good good
good
bad
off
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Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
Power Management
Inline
Status
------
n.a.
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12-19