YASKAWA GA700 Series Technical Manual page 655

Parameter Settings
A1-02 = 3, 7 [CLV, CLV/PM]
A1-02 = 4 [AOLV] and n4-72 = 1 [With Encoder]
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b2-02: DC Injection Braking Current
No.
Name
(Hex.)
b2-02 DC Injection Braking
Current
(018A)
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.
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b2-03: DC Inject Braking Time at Start
No.
Name
(Hex.)
b2-03 DC Inject Braking Time at
Start
(018B)
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. Enable DC Injection
Braking or Speed Search to prevent ov [Overvoltage] or oC [Overcurrent] faults.
• Sets the time of Initial Excitation at start when A1-02 = 4 [AOLV] and n4-72 = 1 [Speed Feedback Mode = Without Encoder].
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b2-04: DC Inject Braking Time at Stop
No.
Name
(Hex.)
b2-04 DC Inject Braking Time at
Stop
(018C)
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.
Note:
Sets the time of Zero Speed Control at stop when A1-02 = 4 [AOLV] and n4-72 = 1 [Speed Feedback Mode = With Encoder].
YASKAWA SIEPC71061705H GA700 Series Technical Manual
Parameter b2-01 sets the frequency to start Zero Speed Control at stop. When the output frequency is less than or
equal to the value set in b2-01, the drive will do Zero Speed Control for the time set in b2-04.
Figure 12.27 Zero Speed Control at Stop
Note:
When b2-01 ≤ E1-09 [Minimum Output Frequency], the drive will start Zero Speed Control from the frequency
set in E1-09.
V/f CL-V/f OLV CLV AOLV
Sets the DC Injection Braking current as a percentage of the drive rated current.
V/f CL-V/f OLV CLV AOLV
Sets the DC Injection Braking Time at stop. Sets the time of Zero Speed Control at start when A1-
02 = 3, 7 [Control Method Selection = CLV, CLV/PM].
V/f CL-V/f OLV CLV AOLV
Sets the DC Injection Braking Time at stop. Sets the time of Zero Speed Control at stop when A1-
02 = 3, 7 [Control Method Selection = CLV, CLV/PM].
Functions of b2-01
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
12.3 b: Application
Default
(Range)
50%
(0 - 100%)
Default
(Range)
A1-02 = 4: 0.30 s
Other than A1-02 = 4: 0.00
s
(0.00 - 10.00 s)
Default
(Range)
Determined by A1-02
(0.00 - 10.00 s)
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