Dc Braking - Toshiba TOSVERT VF-MB1 Instruction Manual

6.8

DC braking

6.8.1
f249 : PWM carrier frequency during DC braking
f250 : DC braking starting frequency
f251 : DC braking current
f252 : DC braking time
 Function
[Parameter setting]
f249 PWM carrier frequency during DC braking
f250
6
f251
f252
Note1: During DC braking, the overload protection sensitivity of the inverter increases. The DC braking
Note 2: During DC braking, the carrier frequency becomes the setting of whichever is lower parameter
Note 3: DC breaking can be done by using terminal input. Input terminal 22: Assign DC braking command
DC braking
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.
Title Function
DC braking starting frequency
DC braking current
DC braking time
Output frequency [Hz]
Set frequency
DC braking starting frequency

Output current [A]
Operation signal (F-CC)
current may be adjusted automatically to prevent tripping.
f249 or f300 .
(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.
2.0-16.0 (kHz)
0.0- fh (Hz)
0.0-100 (%) / (A)
0.0- 25.5 (s)
DC braking
0
0
DC braking time 
F-24
Adjustment range Default setting
Time [s]
DC braking current

ON
OFF
E6581697
4.0
0.0
50
1.0