User`s guide

124
CHAPTER 6 - DETAILED PARAMETER DESCRIPTION
Range
[Factory Setting]
Parameter
Unit
Description / Notes
P300
0.0 to 15.0
DC Braking
[ 0.0
]
Time
0.1 s
P301
0.00 to 15.00
DC Braking
[ 1.00 Hz
]
StartFrequency
0.01 Hz
P302
0.0 to 130
DC Braking
[ 0.0 %
]
Current
0.1 %
The DC braking feature provides a motor fast stop via
DC current injection.
The applied DC braking current, that is proportional to
the braking torque, is set at
P302
, and is adjusted as a
percentage (%) relating to the rated inverter current.
The figures below show the DC braking operation at the
two possible conditions
:
ramp disabling and general
disabling
.
Figure 6.23
- DC braking after ramp disabling
P301
P300
DEAD
TIME
Open
Time
DI - Start/Stop
0 V
DCCURRENT
INJECTION
Motor Speed
Output Frequency
P300
Open
Time
DEADTIME
DCCURRENT
INJECTION
DI - General Enable
Figur
e
6.2
4
-
DC braking after general disabling
Motor Speed
Output Frequency
0 V
Before DC braking starts, there is a "dead time" (motor
runs freely) required forthe 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.