YASKAWA G7 Series Technical Manual page 230

DC Braking Stop
If the stop command is input (i.e., the run command is turned OFF) when b1-03 is set to 2, a wait is made for
the time set in L2-03 (Minimum Baseblock (BB) Time) and then the DC injection brake current set in b2-02 is
sent to the motor to apply a DC injection brake to stop the motor. The DC injection brake time is determined
by the set value in b2-04 and the output frequency when the stop command is input.
Run command
Output frequency
Minimum baseblock
time (L2-03)
INFO
Coast to Stop with Timer
If the stop command is input (i.e., the run command is turned OFF) when b1-03 is set to 3, the Drive output is
interrupted to coast the motor to a stop. After the stop command is input, run commands are ignored until the
time T has elapsed. The time T depends upon the output frequency when the stop command is input and the
deceleration time.
Run command
Output
frequency
Inverter output voltage interrupted
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ON
OFF
Inverter output voltage interrupted
DC injection brake
DC injection brake time
Fig 6.14 DC Injection Braking (DB) Stop
Lengthen the Minimum Baseblock Time (L2-03) when an overcurrent (OC) occurs during stopping.
ON ON
OFF OFF
Operation wait time T
Fig 6.15 Coast to Stop with Timer
DC injection brake time
b2-04
10%
Operation wait time T
ON
Deceleration time
(e.g., C1-02)
Minimum baseblock
time (L2-03)
Minimum output frequency
Output frequency at
stop command input
100% (maximum output frequency)
Output frequency at
stop command input
100% (Maximum output frequency)