E6581697
F-24
6
6.8 DC braking
6.8.1 DC braking
f249 : PWM carrier frequency during DC braking
f250 : DC braking starting frequency
f251 : DC braking current
f252 : DC braking time
Function
A large braking torque can be obtained by applying a direct current to the motor. These parameters
set the direct current to be applied to the motor, the application time and the starting frequency.
[Parameter setting]
Title Function Adjustment range Default setting
f249 PWM carrier frequency during DC braking 2.0-16.0 (kHz) 4.0
f250
DC braking starting frequency 0.0-
fh (Hz) 0.0
f251
DC braking current 0.0-100 (%) / (A) 50
f252
DC braking time 0.0- 25.5 (s) 1.0
Time [s]
DC braking starting frequency
DC braking current
DC braking time
Output frequency [Hz]
DC braking
Operation signal (F-CC)
ON
OFF
Output current [A]
0
0
Set frequency
Note1: During DC braking, the overload protection sensitivity of the inverter increases. The DC braking
current may be adjusted automatically to prevent tripping.
Note 2: During DC braking, the carrier frequency becomes the setting of whichever is lower parameter
f249 or f300.
Note 3: DC breaking can be done by using terminal input. Input terminal 22: Assign DC braking command
(23 is reverse). DC braking is applied while the terminal is ON, regardless of the
f250, f252
settings. Even if the terminal is OFF, DC braking is applied only for the
f252 time.
The amount of DC braking depends on the
f251 settings.
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