YASKAWA A1000 Series Technical Manual page 139

Setting 2: DC Injection Braking to stop
When the Run command is removed, the drive will enter baseblock (turn off its output) for the minimum baseblock time
(L2-03). Once the minimum baseblock time has expired, the drive will brake the motor by injecting DC current into the
motor windings. The stopping time is significantly faster than when compared with simply coasting to stop. The level of
current used for DC Injection Braking is set by parameter b2-02 (default = 50%).
Note: This function is not available in the control modes for PM motors (A1-02 = 5, 6, 7).
Figure 5.4
The time for DC Injection Braking is determined by the value set to b2-04 and by the output frequency at the time the
Run command is removed. It can be calculated by:
Figure 5.5
Note: If an overcurrent (oC) fault occurs during DC Injection Braking to stop, lengthen the minimum baseblock time (L2-03) until the
fault no longer occurs.
Setting 3: Coast to Stop with Timer
When the Run command is removed, the drive will turn off its output and the motor will coast to stop. If a Run command
is input before the time t (value of C1-02) has expired, the drive will not start. A Run command activated during time t
must be cycled after t has expired in order to start the drive.
Figure 5.6
YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
Run
command
ON
Output
frequency
Motor speed
Motor coasts
Figure 5.4 DC Injection Braking to Stop
DC Injection brake time
DC Injection braking time
b2-04 10
b2-04
10%
Stop command was entered
Figure 5.5 DC Injection Braking Time Depending on Output Frequency
Run command
ON
Output
frequency
Figure 5.6 Coast to Stop with Timer
OFF
DC Injection Braking
with the current set in
b2-02
Minimum Baseblock
Time (L2-03)
(b2-04) × 10 × Output frequency
=
Max. output frequency (E1-04)
Output frequency when
(Maximum output
frequency)
OFF ON
Drive output shut off
Run wait time t
5.2 b: Application
100%
OFF ON
5
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