Fuji Electric FRENIC-HVAC User Manual page 373

Restart mode after momentary power failure (Allowable momentary power failure

time) (H16)
H16 specifies the maximum allowable duration (0.0 to 30.0 seconds) from an occurrence of a
momentary power failure (undervoltage) until the restart of the inverter. Specify the
coast-to-stop time during which the machine system and facility can be tolerated.
If the power is restored within the specified duration, the inverter restarts in the restart mode
specified by F14. If not, the inverter recognizes that the power has been shut down so that the
inverter does not apply the restart mode and starts normal running.
If H16 (Allowable momentary power failure time) is set to "Auto," restart will take place until
the DC link bus voltage drops down to the allowable voltage (100 V) for restart after a
momentary power failure. If the DC link bus voltage drops below the allowable voltage, the
inverter recognizes that the power has been shut down so that the inverter does not apply the
restart mode and starts normal running.
The time required from when the DC link bus voltage drops from the threshold of
undervoltage until it reaches the allowable voltage for restart after a momentary
power failure, greatly varies depending on the inverter capacity, the presence of
options, and other factors.
6.3 Details of Function Codes
6-63