Fuji Electric FRENIC-Ace series, User Manual

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5.3 Description of Function Codes
5-70
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Restart mode after momentary power failure (Allowable momentary power failure time) (H16)
Sets the maximum time from when momentary power failure (undervoltage level) occurs until restart (setting
range: 0.0 to 30.0 s). Set coast to a stop time which is allowable for machine and equipment. Momentary power
failure restart operation should be performed within the specified time, however, if the set time is exceeded, the
inverter judges the state as a power shut down, and then operates as powering on again without performing
momentary power failure restart operation.
When allowable momentary power failure time (H16) is set to “999”, momentary power failure restart is performed
until DC link bus voltage decreases by momentary power failure restart allowance voltage (50 V for 200 V class,
100 V for 400 V class), however, if the voltage becomes at or below the momentary power failure allowance
voltage, the state is judged as a power shut down. As a result, the inverter operates as powering ON again without
performing momentary power failure restart operating.
Power supply voltage Allowance voltage of momentary power failure restart
200V 50V
400V 100V
The time until voltage decreases to the momentary power failure restart allowance voltage from
undervoltage differs greatly depending on the inverter capacity and with/without option.
Power restoration
Power failure
DC link bus
voltage
Undervoltage level
Power failure
period
Preparation time:
approx. 0.3 to 0.6 s
Preparation complete Gate command ON
Inverter
status
Run command
(case 1)
Run command
Restart
(case 2)
Normal operation start