5.3 Description of Function Codes 5.3.1 F codes (Fundamental functions)
Bias (Frequency setting 1) (Refer to F01)
Refer to the description of function code F01 to find the details of bias (Frequency setting 1) setting.
DC braking 1 (Starting frequency, Braking level, Braking time)
DC braking (Braking response mode)
DC braking (Braking timer at the startup)
These function codes specify the DC braking that prevents motor 1 from running by inertia during decelerate-to-
stop operation.
If the motor enters a decelerate-to-stop operation by turning OFF the run command or by decreasing the reference
frequency below the stop frequency, the DC braking starts when output frequency reached the DC braking starting
frequency. Set braking starting frequency (F20), braking level (F21), and braking time (F22) to start DC braking
when deceleration is stopped.
Setting the braking time to “0.00” (F22 = 0) disables the DC braking.
By H195, it is possible to perform DC braking when starting up inverter. By doing so, it is efficient for preventing
from falling down when the brake is released, and prompt torque startup when starting up.
Braking starting frequency (F20)
F20 specifies the frequency at which the DC braking starts its operation during motor decelerate-to-stop state.
• Data setting range: 0.0 to 60.0 (Hz)
Braking level (F21)
F21 specifies the output current level to be applied when the DC braking is activated. The function code data should
be set, assuming the rated output current of the inverter as 100 %, in increments of 1 %.
• Data setting range HHD: 0 to 100%, HND: 0 to 80%
The inverter rated output current differs between the HHD/HND specification.
Braking time (F22)
F22 specifies the braking period that activates DC braking.
• Data setting range: 0.00 (Disable), 0.01 to 30.00 (s)
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