Yaskawa E7 Drive User Manual - Manual (Page 81)

Programming 5 - 7
Fig 5.5 Coast to Stop
2: DCInj to Stop: When the Run command is removed, the Drive will Baseblock (turn off its output) 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 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 (50% Default). 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 5.6 DC Injection Braking to Stop
3: Coast w/Timer: When the Run command is removed, the Drive will turn off its output and the motor will coast to a stop.
If a Run command is input before time T (operation wait time) expires, the Drive will not run and the Run command will need
to be cycled before operation can occur. The time T (operation wait time) is determined by the output frequency when the Run
command is removed and the active deceleration time (C1-02).
IMPORTANT
After a stop is initiated, a subsequent Run commands input before the Minimum Baseblock Time (L2-03)
has expired, will be ignored.
IMPORTANT
If an overcurrent (OC) fault occurs during DCInj to Stop, lengthen the Minimum Baseblock Time (L2-03)
until the fault no longer occurs.
ON
OFF
Run Command
Output Frequency Drive Output Frequency Interrupted
100 %
0 %
TIME
Motor Speed
(CLOSED)
(OPEN)
04) - (E1 Frequency Maximum
Frequency Output 10 04) - (b2
Time Brake Injection DC
× ×
=
ON
OFF
Run Command
Output Frequency Drive Output Voltage Interrupted
DC Injection Brake
DC Injection Brake Time Minimum Baseblock
Time (L2-03)
100 %
0 %
D
C
In
je
ct
io
n Br
ak
e
T
im
e
b2-04 x 10
b2-04
10%
100% (Maximum
Output Frequency) b2-04
(CLOSED)
(OPEN)
TM_E7_01_07182008.book Page 7 Wednesday, July 23, 2008 2:35 PM