[c-nsp] [Re: 7606 power supply issue]

[Edoardo Martelli]

Hi

Just a follow up to my post.

Finally the TAC has found there is a bug in some 1900W PSUs:

CSCsh16506 Bug Details

Symptom:
PWR-1900-AC/6 might show power capacity of only 1019.34W instead of
1869.42 W when connected to 220V AC input.
(Note it is normal for PS to show power capacity of 1019.34W when
connected to 110V AC input)

Router#show power
system power redundancy mode = redundant
system power redundancy operationally = non-redundant
system power total = 1869.42 Watts (44.51 Amps @ 42V)
system power used = 1063.86 Watts (25.33 Amps @ 42V)
system power available = 805.56 Watts (19.18 Amps @ 42V)
Power-Capacity PS-Fan Output Oper
PS Type Watts A @42V Status Status State
---- ------------------ ------- ------ ------ ------ -----
1 PWR-1900-AC/6 1869.42 44.51 OK OK on
2 PWR-1900-AC/6 1019.34 24.27 OK OK on <<<<< Wrong Value

Conditions:
A small amount of PWR-1900-AC/6 have misprogrammed EPROM content which
caused IOS to display the wrong power capacity shown above.

Workaround:
None. Please contact TAC to have the affected product replaced

--

I got four PSUs from that small amount of bugged ones, probably not too
many are left around ;-)

Cheers
Edoardo


Edoardo Martelli wrote:
> Hello
> 
> We recently bought a 7606 with two PWR-1900-AC/6 power supply units.
> They are supposed to provide 1900w at 220V, but in fact they only
> provide 1000W. We RMAed them, but still the new ones came with the same
> problem.
> 
> The chassis seems to be ok, because I tried the PWR-1900-AC/6 of another
> 7606 we have, and they provide 1900W as expected.
> 
> Anyone had this problem with recently bought PWR-1900-AC/6?
> Maybe there is a switch inside the PSU that has to be changed?
> 
> Thank you
> Edoardo
> 
> 
> 
> New PSUs:
> 
> g513-e-rci76-2#sh power
> system power redundancy mode = combined
> system power total =     1698.90 Watts (40.45 Amps @ 42V)
> system power used =      1579.62 Watts (37.61 Amps @ 42V)
> system power available =  119.28 Watts ( 2.84 Amps @ 42V)
>                         Power-Capacity PS-Fan Output Oper
> PS   Type               Watts   A @42V Status Status State
> ---- ------------------ ------- ------ ------ ------ -----
> 1    PWR-1900-AC/6      1019.34 24.27  OK     OK     on
> 2    PWR-1900-AC/6      1019.34 24.27  OK     OK     on
> 
> 
> With a PSU from an older box:
> 
> g513-e-rci76-2#sh power
> system power redundancy mode = combined
> system power total =     1869.42 Watts (44.51 Amps @ 42V)
> system power used =      1579.62 Watts (37.61 Amps @ 42V)
> system power available =  289.80 Watts ( 6.90 Amps @ 42V)
>                         Power-Capacity PS-Fan Output Oper
> PS   Type               Watts   A @42V Status Status State
> ---- ------------------ ------- ------ ------ ------ -----
> 1    PWR-1900-AC/6      1869.42 44.51  OK     OK     on
> 2    PWR-1900-AC/6      1019.34 24.27  OK     OK     on
> 
> 
> NEW PSUs info:
> 
> 513-e-rci76-2#sh idprom power-supply 1
> IDPROM for power-supply #1
>   (FRU is 'AC_6 power supply, 1900 watt')
>   OEM String = 'Cisco Systems, Inc.'
>   Product Number = 'PWR-1900-AC/6'
>   Serial Number = 'DCA1021402C'
>   Manufacturing Assembly Number = '34-1809-03'
>   Manufacturing Assembly Revision = 'A0'
>   Hardware Revision = 1.1
>   Current supplied (+) or consumed (-) = 24.27A
> 
> 
> g513-e-rci76-2#sh idprom power-supply 2
> IDPROM for power-supply #2
>   (FRU is 'AC_6 power supply, 1900 watt')
>   OEM String = 'Cisco Systems, Inc.'
>   Product Number = 'PWR-1900-AC/6'
>   Serial Number = 'DCA1021401P'
>   Manufacturing Assembly Number = '34-1809-03'
>   Manufacturing Assembly Revision = 'A0'
>   Hardware Revision = 1.1
>   Current supplied (+) or consumed (-) = 24.27A
> 
> 
> 
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-- 
Chris Griffin                           cgriffin at ufl.edu
Sr. Network Engineer - CCNP             Phone: (352) 392-2061
CNS - Network Services                  Fax:   (352) 392-9440
University of Florida/FLR               Gainesville, FL 32611