Dell C8000 owner manual 259

Table 5-3. Case Scenario 2

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%	1	Sets PWM = 100%
		2	Triggers sled throttling for 1 hr.

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)	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	Triggers sled throttling for 1 hr.

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.

Troubleshooting

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