[c-nsp] SIP 400 reload due to power supply issue

[zaid]

Hi 

I have 7606 chassis equipped with SIP 400 that reloading from time to time due to power supply issue, i don't know why in spite of the available power is 1237.74 Watts
  
show power
system power redundancy mode = redundant
system power redundancy operationally = non-redundant
system power total =     2669.10 Watts (63.55 Amps @ 42V)
system power used =      1431.36 Watts (34.08 Amps @ 42V)
system power available = 1237.74 Watts (29.47 Amps @ 42V)
                        Power-Capacity PS-Fan Output Oper
PS   Type               Watts   A @42V Status Status State
---- ------------------ ------- ------ ------ ------ -----
1    PWR-2700-DC        2669.10 63.55  OK     OK     on
2    PWR-2700-DC        1319.22 31.41  OK     OK     on
                        Pwr-Allocated  Oper
Fan  Type               Watts   A @42V State
---- ------------------ ------- ------ -----
1    FAN-MOD-6SHS        180.18  4.29  OK
                        Pwr-Requested  Pwr-Allocated  Admin Oper
Slot Card-Type          Watts   A @42V Watts   A @42V State State
---- ------------------ ------- ------ ------- ------ ----- -----
1    WS-X6724-SFP        125.16  2.98   125.16  2.98  on    on
2    7600-SIP-200        240.24  5.72   240.24  5.72  on    on
3    7600-SIP-400        265.02  6.31   265.02  6.31  on    on
5    RSP720-3C-GE        310.38  7.39   310.38  7.39  on    on
6    (Redundant Sup)       -     -      310.38  7.39  -     -


I have this log also 

Feb  1 20:10:43 UTC: %C7600_PWR-SP-4-PSOUTPUTDROP:
Power supply 1 output has dropped
Feb  1 20:10:43 UTC: %C7600_PWR-SP-4-UNDERPOWERED:
insufficient power to operate all FRU   s in system.
Feb  1 20:10:43 UTC: %C7600_PWR-SP-4-DISABLED: power to
module in slot 3 set off (FRU-power denied)

Any idea please if the problem with the power supply or the power source .

ZH