WEG CFW08 Vector inverter User Manual page 98

[Factory Setting]
Parameter
P300
DC Braking
Time
P301
DC Braking
Start Frequency
P302
DC Braking
Current
Range
Unit Description / Notes
0.0...15.0s The DC braking feature provides a motor fast stop via DC current
[ 0.0 ] injection.
The applied DC braking current, that is proportional to the braking
0.1s
torque, is set at P302, and is adjusted as a percentage (%)
0.00...15.00Hz relating to the rated inverter current.
The figures below show the DC branking operation at the two possible
[ 1.00Hz ]
0.01Hz conditions: ramp disabling and general disabling.
0.0...130%
[ 0.0% ]
0.1%
Before DC braking starts, there is a "Dead Time" (motor runs freely)
required for the motor demagnetization. This time is function of the
motor speed at which the DC braking occurs.
During the DC braking the LED display flashes
If the inverter is enabled during the braking process, this process
will be aborted and motor operates normally.
DC braking can continue its braking process even after the motor
has stopped. Pay special attention to the dimensioning of the motor
thermal protection for cyclic braking of short times.
In applications where the motor current is lower than the rated
inverter current, and where the braking torque is not enough for
the braking condition, please contact WEG to optimize the
settings.
DETAILED PARAMETER DESCRIPTION
P301
Motor Speed
Output Frequency
0V
DI - Start/Stop
Figure 6.21 - DC braking after ramp disabling
Motor Speed
Output Frequency
DEAD TIME
0V
DI - General Enable
Figure 6.22 - ADC braking after general disabling
DC CURRENT
INJECTION
P300
Time
DEAD
TIME
open
DC CURRENT
INJECTION
P300
Time
open
.
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