6509 PSU Query

Answered Question
Oct 27th, 2005
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Hello All,


I got the following message when I did a SHOW POWER on our 6509:

"Note: PS2 capacity is limited to 2940.00 Watts (70.00 Amps @ 42V)

when PS1 is not present"


The PSUs are running in redundant mode.

Is this something I should worry about?


ukcap04-133-c65-ios#show power

system power redundancy mode = redundant

system power total = 3780.00 Watts (90.00 Amps @ 42V)

system power used = 1215.48 Watts (28.94 Amps @ 42V)

system power available = 2564.52 Watts (61.06 Amps @ 42V)

Power-Capacity PS-Fan Output Oper

PS Type Watts A @42V Status Status State

---- ------------------ ------- ------ ------ ------ -----

1 WS-CAC-4000W-INT 3795.12 90.36 OK OK on

2 WS-CAC-4000W-INT 3795.12 90.36 OK OK on

Note: PS2 capacity is limited to 2940.00 Watts (70.00 Amps @ 42V)

when PS1 is not present

Pwr-Requested Pwr-Allocated Admin Oper

Slot Card-Type Watts A @42V Watts A @42V State State

---- ------------------ ------- ------ ------- ------ ----- -----

5 WS-SUP720-3B 282.24 6.72 282.24 6.72 on on

6 WS-SUP720-3B 282.24 6.72 282.24 6.72 on on

8 WS-X6748-GE-TX 325.50 7.75 325.50 7.75 on on

9 WS-X6748-GE-TX 325.50 7.75 325.50 7.75 on on


Correct Answer by szahid about 11 years 9 months ago

If you have 2 x 4000W and the power supply in bay #1 goes down, then the 4000W PSU in bay #2 will NOT be able to drive the full 4000W power - rather it will be limited to about 3000W. I dont know the exact

engineering reasons behind this but do know that this is not a bug and it is doing the right thing. Note the line in the output below which

highlights this...


PS Type Watts A @42V Status Status State


---- ------------------ ------- ------ ------ ------ -----


2 WS-CAC-4000W-INT 3795.12 90.36 - - off


*Note: PS2 capacity is limited to 2940.00 Watts (70.00 Amps @ 42V)


when PS1 is not present*


thanks

Salman Z.


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b.speltz Thu, 11/03/2005 - 10:04
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  • Bronze, 100 points or more

Yes, this is the correct behavior of the router only.No need to worry about this.This is due to the limitation of the chassis (not power supply) New E-series chasses have higher power limit.

Correct Answer
szahid Thu, 11/03/2005 - 10:10
User Badges:
  • Silver, 250 points or more

If you have 2 x 4000W and the power supply in bay #1 goes down, then the 4000W PSU in bay #2 will NOT be able to drive the full 4000W power - rather it will be limited to about 3000W. I dont know the exact

engineering reasons behind this but do know that this is not a bug and it is doing the right thing. Note the line in the output below which

highlights this...


PS Type Watts A @42V Status Status State


---- ------------------ ------- ------ ------ ------ -----


2 WS-CAC-4000W-INT 3795.12 90.36 - - off


*Note: PS2 capacity is limited to 2940.00 Watts (70.00 Amps @ 42V)


when PS1 is not present*


thanks

Salman Z.


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