Dell PowerEdge C8000 - Manual (Page 260)

260 Troubleshooting
• 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 less than or
equal to 100%, the FC firmware will send a signal to the fan to operate at
the set duty cycle.
• Interval 4 — If the calculated value of the PWM duty cycle 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 5 — 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 5-5 lists the FC firmware responses in case scenario 4:
• 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.
Table 5-5. Case Scenario 4
Interval (30 secs) PWM Results Fan Controller Firmware Action
Interval 1 PWM > 100% 1 Sets PWM = 100%
2 Sled throttling mechanism is active
Interval 2 PWM  100% 1 Sets PWM duty cycle
2 Sled throttling mechanism is inactive
Interval 3 PWM  100% Sets PWM duty cycle
Interval 4 PWM > 100% 1 Sets PWM = 100%
2 Sled throttling mechanism is active
Interval 5 PWM  100% 1 Sets PWM duty cycle
2 Sled throttling mechanism is inactive
Interval 6 PWM > 100% 1 Sets PWM duty cycle = 100%
2 Triggers sled throttling for 1 hr.