Yaskawa F7 Drive User Manual - Manual (Page 108)

Basic Programming 5 - 7
2: DC Injection to Stop: When the run command is removed, the Drive will Baseblock (turn off all output transistors) for the
Minimum Baseblock Time (L2-03). Once the Minimum Baseblock Time has expired, the Drive will
inject DC current into the motor windings to try and lock the motor shaft. The stopping time will be
reduced as compared to Coast to Stop. The level of DC Injection current is set by parameter b2-02.
The DC Injection brake time is determined by the set value in b2-04 and the output frequency at the
time the run command is removed.
Fig 5.5 DC Injection Braking to Stop
3: Coast to Stop with Timer: When the run command is removed, the Drive will turn off its output transistors and the motor
will coast to a stop. If a run command is input before the timer expires, the Drive will not run and
the run command will be ignored. The timer value is determined by the active deceleration time
and the output frequency when the run command is removed.
Fig 5.6 Coast to Stop with Timer
IMPORTANT
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.
04) - (E1 Frequency Maximum
Frequency Output 10 04) - (b2
Time Brake Injection DC
× ×
=
ON
OFF
Run Command
Output Frequency
DC Injection Braking
DC Injection Braking Time Minimum Baseblock
Time (L2-03)
100 %
0 %
DC Injection
Brake Time
b2-04 x 10
b2-04
10% 100% (Maximum
Output Frequency)
Output Frequency at Stop Command Input
Run Command
Output Frequency
OFF
ON
Timer Value
100 %
0 %
Deceleration
Time
Minimum
Baseblock
Time (L2-03)
Minimum
Output
Frequency
100% (Maximum
Output Frequency)
Output Frequency at Stop Command Input
Timer Value