5-58
Ch
ap
. 5
FUNCTION C
O
DES
F codes
F18
Bias (Frequency command 1)
(Refer to F01.)
F20 to F22
H95
DC Braking 1 (Braking starting frequency, Braking level, and Braking time)
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 goes down to the DC braking starting frequency (F20).
Setting the braking time to "0.0" (F22 = 0) disables the DC braking.
Braking starting frequency (F20)
Data setting range: 0.0 to 60.0 (Hz)
F20 specifies the frequency at which the DC braking starts its operation during motor decelerate-to-stop state.
Braking level (F21)
Data setting range: 0 to 80 (%) LD/MD-mode inverters
0 to 100 (%) HD-mode inverters
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%.
The inverter rated output current differs between the LD/MD and HD modes.
0% to 100% for inverters of 7.5 HP or below.
Braking time (F22)
Data setting range: 0.01 to 30.00 (s), 0.00 (Disable)
F22 specifies the braking period that activates DC braking.
Braking response mode (H95)
H95 specifies the DC braking response mode. When vector control without/with speed sensor is selected, the response is
constant.
Data for H95
Characteristics
Note
0
Slow response. Slows the rising edge of the current,
thereby preventing reverse rotation at the start of DC
braking.
Insufficient braking torque may result at the
start of DC braking.
1
Quick response. Quickens the rising edge of the
current, thereby accelerating the build-up of the
braking torque.
Reverse rotation may result depending on the
moment of inertia of the mechanical load and
the coupling mechanism.
Содержание FRENIC-MEGA
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