YASKAWA Varispeed E7 Instruction Manual And Parameter Description page 150

DC Braking Stop
After the stop command is input and the minimum baseblock time (L2-03) has elapsed, DC injection will be
applied to the motor. The applied DC injection current is programmed in parameter b2-02. The DC injection
brake time depends on the set value of b2-04 and on the output frequency at the moment the stop command is
input.
Run command
ON
Output frequency
Minimum baseblock
time (L2-03)
Lengthen the Minimum Baseblock Time (L2-03) when an overcurrent (OC) occurs during stopping.
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 Inverter output
is switched off so that the motor coasts to stop. After the stop command is input, run commands are ignored
until the time T has elapsed. The time T depends on the output frequency when the stop command is input and
on the deceleration time.
Run command
Output frequency
Inverter output voltage interrupted
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DC injection brake time
OFF
b2-04 x 10
Inverter output voltage interrupted
DC injection brake
b2-04
DC injection brake time
Fig 6.13 DC Injection Braking Stop
Deceleration time
(e.g., C1-02)
Minimum baseblock
Operation wait time T
Fig 6.14 Coast to Stop with Timer
100% (maximum output frequency
10%
Operation wait time T
time (L2-03)
Minimum output frequency 100% (Maximum output frequency)
Stopping Methods
Output frequency at
stop command input
Output frequency at
stop command input
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