Dc Injection Braking Function; Dc Injection Braking (Db) - Omron MX2 Series User Manual

7-9

DC Injection Braking Function

This section describes the DC injection braking function.
7-9-1

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
inverter.
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 the Multi-function Input S1 to S7 Selection (C001 to C007) to 07 (DB: External DC injec-
tion braking) and turning ON/OFF the terminal to which the external DC injection braking function
is allocated.
• Setting the DC Injection Braking Selection (A051) to 01 (Enabled) and then setting appropriate
function parameters.
• Setting the DC Injection Braking Selection (A051) to 02 (Enabled) and controlling the motor only
by comparison via the frequency set in the DC Injection Braking Frequency parameter.
Note, however that the use of DC injection braking may not cause the motor to stop due to the moment
of inertia of the motor load.
Parameter
No.
A051 DC Injection Braking Selection
A052 DC Injection Braking Frequency
DC Injection Braking Delay
A053
Time
A054 DC Injection Braking Power
Startup DC Injection Braking
A057
Power
A055 DC Injection Braking Time
DC Injection Braking Edge/Level
A056
Selection
Multi-function Compact Inverter 3G3MX2-V1 User's Manual (I585-E1)
Function name
00:
01:
02:
0.00 to 60.00
Set the frequency at which you want to
start DC injection braking to stop the
motor rotation, when the DC injection
braking function is enabled.
0.0 to 5.0
Set the delay time until the motor starts
applying DC injection braking after the set
DC Injection Braking Frequency is
reached, or after the terminal DB turns ON.
Heavy load mode (b049 = 00): 0. to 100.
Light load mode (b049 = 01): 0. to 70.
0. (Weakest: Zero current) to 100.
(Strongest: Rated current)
0.0 to 60.0
Set the time during which DC injection
braking is applied after deceleration stop.
Setting this time is effective when the
terminal DB performs edge operation.
00:
01:
Data
Disabled
Enabled
Enabled
(Operates only via set frequency)
Edge operation (Examples 1 −a to 6−a)
Level operation (Examples 1−b to 6−b)
7 Other Functions
Default
Unit
data
−
00
0.50 Hz
0.0 s
50. %
0. %
0.5 s
−
01
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