Using The Dc Injection Brake - YASKAWA Varispeed G7 Instruction Manual

Using the DC Injection Brake

Set constant b2-03 to apply the DC injection braking current 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 Constants
Con-
stant
Number
b2-02
b2-03
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 Inverter is being stopped. DC injection braking is used at startup for flux vector
control.
The time chart for the DC injection brake is shown below.
-16
6
Name
Description
Display
DC injection
Sets the DC injection braking cur-
braking current
rent as a percentage of the
Inverter rated current.
DCInj Current
DC injection Used to set the time to perform
braking time at DC injection braking at start in
start units of 1 second.
Used to stop coasting motor and
restart it. When the set value is 0,
DCInj
DC injection braking at start is not
Time@Start
performed.
DC injection brake command
FRUN
Output frequency
DC injection brake
(DC injection braking at
startup is used for flux
vector control.)
If you input the DC injection brake command from an external terminal, or if the Run Com-
mand and jog command are input, the DC injection brake will be disabled, and operation will
resume.
Fig 6.18 DC Injection Brake Time Chart
Change
Setting Factory during
Range Setting Opera-
V/f
tion
0 to
50% No A
100
0.00
to 0.00 s No A
10.00
) to 60 (DC injection brake command), you can
DC injection brake
b2-01
E1-09
(DC injection braking at
startup is used for flux
vector control.)
Control Methods
MEMO
Open Open
BUS
V/f Flux
Loop Loop
Regis-
with Vec-
Vector Vector
ter
PG tor
1 2
A A No No 18AH
A A A A 18BH