Using The Dc Injection Brake - YASKAWA G7 Series Technical Manual

Using the DC Injection Brake

Set parameter b2-03 to apply the DC injection brake voltage to the motor while it is coasting to a stop, to stop
the motor and then restart it.
Set b2-03 to 0 to disable the DC injection brake at start.
Set the DC injection brake current using b2-02. DC injection braking is used at startup for flux vector control
with the current set in E2-03 (Motor no-load current).
Related Parameters
Name
Parameter
Number
Display
DC Injection Sets the DC injection braking
Braking current as a percentage of the
Current Drive rated current.
b2-02 Note: The DC excitation current
is determined by the setting in E2-
DCInj Current
03 when operating in flux loop
vector control mode.
DC Injection
Braking Time/
Sets the time of DC injection
DC Excitation
b2-03 braking at start in units of 0.01
Time at Start
seconds.
DCInj
Time@Start
Inputting the DC Injection Brake Command from Control Circuit Terminals
If you set a multi-function contact input terminal (H1-
apply the DC injection brake to the motor by turning ON the terminal for which the DC injection brake com-
mand has been set when the Drive is being stopped. DC injection braking is used at startup for flux vector con-
trol.
The time chart for the DC injection brake is shown below.
DC injection brake command
FRUN
Output frequency
If you input the DC injection brake command from an external terminal, or if the run command
and jog command are input, the DC injection brake will be disabled, and operation will
resume.
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Setting
Description
Range
0
to
100
0.00
to
10.00
DC injection brake
E1-09
(DC injection braking at
startup is used for flux
vector control.)
Fig 6.16 DC Injection Brake Time Chart
Control Methods
Change
Factory
V/f
during
Setting
V/f with
Operation
PG
50% No A A
0.00sec No A A
) to 60 (DC injection brake command), you can
DC injection brake
b2-01
(DC injection braking at
startup is used for flux
vector control.)
Stopping Methods
Open Open
Loop Flux Loop
Vector Vector Vector
1 2
A No No
A A A
13
6-