Dc Braking - FujiFilm FVR-Micro Instruction Manual

(Point A)
To set the reference frequency to 0 Hz for an analog input being at 1 V, set the bias to 0% (F18
= 0). Since 1 V is the bias base point and it is equal to 10% of 10 V (full scale), set the bias base
point to 10% (C50 = 10).
(Point B)
To make the maximum frequency equal to the reference frequency for an analog input being at 5 V,
set the gain to 100% (C32 = 100). Since 5 V is the gain base point and it is equal to 50% of 10 V (full
scale), set the gain base point to 50% (C34 = 50).
The setting procedure for specifying a gain or bias alone without changing any base points
is the same as that of Fuji conventional inverters.
F20 to F22
DC Braking 1 (Braking starting frequency, Braking level, and Braking time)
H95
DC Braking (Braking response mode)
F20 through F22 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 inverter activates the DC
braking by flowing a current at the braking level (F21) during the braking time (F22) when the
output frequency reaches the DC braking starting frequency (F20).
Setting the braking time (F22) to "0.00" disables the DC braking.
 Braking starting frequency (F20)
F20 specifies the frequency at which the DC braking starts its operation during motor decelerate-
to-stop state.
Generally, set the motor rated slip frequency or so to F20. Setting an extremely
large value makes the control unstable; according to conditions, it activates an
overvoltage protection.
 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%.
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