Dell PowerEdge C8000 Hardware Owner's Manual page 259

Table 5-3. Case Scenario 2
Interval (30 secs)
Interval 1
Interval 2
Interval 3
Table 5-3 lists the FC firmware responses in case scenario 2:
• Interval 1 — If the calculated value of the PWM is higher than 100%, the
FC firmware will send a signal to the fan to operate at 100% duty cycle and
trigger sled throttling.
• Interval 2 — If the calculated value of the PWM duty cycle is less than or
equal to 100%, the FC firmware will send a signal to the fan to operate at
the set duty cycle.
• Interval 3 — If the calculated value of the PWM duty cycle is still higher
than 100% again, the FC firmware will send a signal to the fan to operate
at 100% duty cycle and trigger sled throttling for 1 hour.
Table 5-4. Case Scenario 3
Interval (30 secs)
Interval 1
Interval 2
Interval 3
Interval 4
Interval 5
Table 5-4 lists the FC firmware responses in case scenario 3:
• Interval 1 — If the calculated value of the PWM is higher than 100%, the
FC firmware will send a signal to the fan to operate at 100% duty cycle and
trigger sled throttling.
PWM Results
PWM > 100%
PWM  100%
PWM > 100%
PWM Results
PWM > 100%
PWM  100%
PWM  100%
PWM > 100%
PWM > 100%
Fan Controller Firmware Action
1 Sets PWM= 100%
2 Sled throttling mechanism is active
1 Sets PWM duty cycle
2 Sled throttling mechanism is inactive
1 Sets PWM = 100%
2 Triggers sled throttling for 1 hr.
Fan Controller Firmware Action
1 Sets PWM = 100%
2 Sled throttling mechanism is active
1 Sets PWM duty cycle
2 Sled throttling mechanism is inactive
Sets PWM duty cycle
1 Sets PWM = 100%
2 Sled throttling mechanism is active
1 Triggers sled throttling for 1 hr.
Troubleshooting
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