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. 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.

 

 

 

 

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.

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Troubleshooting

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Image 260
Dell C8000 owner manual 260