Omron VARISPEED F7 User Manual page 199

DC Braking to Stop (b1-03=2)
After the stop command has been input and the minimum baseblock time (L2-03) has elapsed, DC injection
will be applied to the motor. The applied DC injection current can be set in parameter b2-02. The DC injection
braking time depends on the set value of b2-04 and on the output frequency at the moment when the stop com-
mand is input and. If the output frequency was higher than 10% of the maximum output frequency (E1-04) the
DC injection time is lengthened like shown in the figure below.
Run command
Output frequency
Minimum baseblock
time (L2-03)
INFO
Coast to Stop with a Timer (b1-03=3)
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
6
on the deceleration time.
Run command
Output frequency
Inverter output voltage interrupted
16
6-
OFF
ON
Inverter output voltage interrupted
DC injection brake
DC injection brake time
Fig 6.18 DC Injection Braking to Stop
Lengthen the Minimum Baseblock Time (L2-03) when an overcurrent (OC) occurs during stopping.
Operation wait time T
Fig 6.19 Coast to Stop with Timer
DC injection brake time
b2-04 x 10
b2-04
100% (maximum output frequency
10%
Operation wait time T
Deceleration time
(e.g., C1-02)
Minimum baseblock
time (L2-03)
Minimum output frequency
Output frequency at
stop command input
Output frequency at
stop command input
100% (Maximum output frequency)