7-5
DC Injection Braking Function
This section describes the DC injection braking function.
7-5-1
DC Injection Braking (DB)
Use this function to have the motor apply DC injection braking according to the load.
For an induction motor, this function allows braking with no feedback of regenerated energy to the in-
verter.
However, for a PM motor, consider to take measures against overvoltage because even the DC injec-
tion braking function allows regenerated energy to be fed back to the inverter.
DC injection braking can be controlled with one of the following three methods:
• Setting “13: DB (External DC injection braking)” to Input Terminal [DI1] to [DI7] Function Selection
(E01 to E05, E98, E99) and turning ON/OFF the terminal to which the external DC injection braking
function is allocated.
• Setting DC Injection Braking Selection (E114) and controlling the motor by parameter settings.
• Setting DC Injection Braking Selection (E114) and controlling the motor only by comparison via the
frequency set in the parameter.
Note, however that the use of DC injection braking may not cause the motor to stop due to the mo-
ment of inertia of the motor load.
DC injection braking is disabled when the torque control, position control and servo lock is enabled.
Parameter No. Function name Data
Default da-
ta
Unit
E114
DC Injection Braking Se-
lection
0 to 2
0: External DC injection braking
1: External DC injection braking/
setting frequency
2: Setting frequency
0 -
F20/A09
1st DC Injection Braking
Start Frequency/2nd DC
Injection Braking Start Fre-
quency
0.0 to 60.0 0.0 Hz
F21/A10
1st DC Injection Braking
Level/2nd DC Injection
Braking Level
0 to 100
0 to 100% (HHD mode)
0 to 80% (HND/HD mode)
0 to 60% (ND mode)
Based on inverter rated current
0 %
F22/A11
1st DC Injection Braking
T
ime/2nd DC Injection
Braking Time
0.00; 0.01 to 30.00 s
0.00: Disable
0.01 to 30.00 s
0.00
s
H95
DC Injection Braking Start
Characteristic Selection
0; 1
0: Slow response
1: Quick response
1 -
E115
External DC Injection Brak-
ing Edge/Level Selection
0; 1
0: Edge operation
1: Level operation
1 -
E116
Startup DC injection brak-
ing
0 to 100% (HHD mode)
0 to 80% (HND mode)
0 -
7 Other Functions
7-63
M1 Series Standard Type User's Manual (I669)
7-5 DC Injection Braking Function
7
7-5-1 DC Injection Braking (DB)
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