Troubleshooting 259
Table5-3 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.
Table5-4 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.
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 5-4. 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.