Parameter Details
12
12.3 b: Application
YASKAWA SIEPC71061737D GA800 Drive Technical Reference 731
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].
■ 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 time of Zero Speed Control at stop when A1-02
= 3, 7 [Control Method Selection = CLV, 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.
Note:
Sets the time of Zero Speed Control at stop when A1-02 = 4 [AOLV] and n4-72 = 1 [Speed Feedback Mode = With Encoder].
■ 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 is effective when you start a high-capacity motor (a motor 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 current level for DC Injection Braking at start changes linearly from the setting of b2-08 to the setting of b2-03 as
shown in Figure 12.27.
Figure 12.27 DC Current Level during DC Injection Braking at Start
Note:
• If b2-08 < 100%, flux will develop very slowly.
• When b2-08 = 0%, the DC current level will be the DC Injection current set in b2-02 [DC Injection Braking Current].
• If b2-08 is set too high, DC Injection Braking at start can cause a large noise. Adjust b2-08 to decrease the volume to the permitted level.
■ b2-12: Short Circuit Brake Time @ Start
No.
(Hex.)
Name Description
Default
(Range)
b2-12
(01BA)
Short Circuit Brake Time @
Start
Sets the Short Circuit Braking time at start.
0.00 s
(0.00 - 25.50 s)
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