Fuji Electric FRENIC-AQUA series, User Manual

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It is also possible to use an external digital input signal as the terminal command
DCBRK ("Enable DC braking").
As long as the DCBRK is ON, the inverter performs DC braking, regardless of the
braking time specified by F22.
For details about DCBRK , refer to E01 through E07 (data = 13).
Turning the DCBRK ON even when the inverter is in a stopped state activates the
DC braking. This feature allows the motor to be excited before starting, resulting in
smoother acceleration (quicker build-up of acceleration torque).
In general, specify data of function code F20 at a value close to the rated slip
frequency of motor. If you set it at an extremely high value, control may become
unstable and an overvoltage alarm may result in some cases.
The DC braking function of the inverter does not provide any holding mechanism.
Injuries could occur.