Parameter Details
11
11.3 b: Application
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 711
■ b2-02: DC Injection Braking Current
No.
(Hex.)
Name Description
Default
(Range)
b2-02
(018A)
DC Injection Braking
Current
Sets the DC Injection Braking current as a percentage of the drive rated
current.
50%
(0 - 100%)
When the DC Injection Braking current is more than 50%, the drive decreases the carrier frequency to 1 kHz. The
motor rated current determines how much DC Injection Braking current that the drive can use.
The DC Injection Braking current level has an effect on the strength of the magnetic field that locks the motor
shaft. As the current level increases, the motor windings will supply more heat. Do not set this parameter higher
than the level that is necessary to hold the motor shaft.
Note:
When A1-02 = 4 [Control Method Selection = AOLV] and n4-72 = 1 [Speed Feedback Mode = With Encoder], the drive ignores the b2-
02 setting and does initial excitation.
■ b2-03: DC Inject Braking Time at Start
No.
(Hex.)
Name Description
Default
(Range)
b2-03
(018B)
DC Inject Braking
Time at Start
Sets the DC Injection Braking Time at stop. Sets the zero speed control at
stop in CLV, AOLV, or CLV/PM.
A1-02 = 4: 0.03 s
Other than A1-02 =
4: 0.00 s
(0.00 - 10.00 s)
This function stops then restarts a coasting motor and increases motor flux to make high starting torque (a process
called initial excitation). Set this parameter to 0.00 to disable the function.
Note:
To restart a coasting motor, use DC Injection Braking to stop and then restart the motor, or enable Speed Search. DC Injection Braking
can trigger ov [Overvoltage] or oC [Overcurrent].
■ b2-04: DC Inject Braking Time at Stop
No.
(Hex.)
Name Description
Default
(Range)
b2-04
(018C)
DC Inject Braking
Time at Stop
Sets the DC Injection Braking Time at stop. Sets the zero speed control at
stop in CLV, AOLV, or CLV/PM.
Determined by A1-02
(0.00 - 10.00 s)
This function fully stops a motor with a large inertia during deceleration and will not let the inertia continue to
rotate the motor.
Set this parameter to 0.00 to disable the function.
When a longer time is required to stop the motor, increase the value.
■ b2-08: Magnetic Flux Compensation Value
No.
(Hex.)
Name Description
Default
(Range)
b2-08
(0190)
Magnetic Flux
Compensation Value
Sets how much current the drive injects when DC Injection Braking at Start
starts (Initial Excitation) as a percentage of E2-03 [Motor No-Load
Current].
0%
(0 - 1000%)
This parameter starts a high-capacity motor (motors with a large secondary circuit time constant). This function
can quickly increase motor flux to make high starting torque (a process called initial excitation).
The DC Injection Braking at start current level changes linearly from the value set in b2-08 to the value set in E2-
03, as shown in Figure 11.28.
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