12.3 b: Application
514 YASKAWA SIEPC71061753C GA500 Technical Manual
■ 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 12.21.
Figure 12.21 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)
This function stops and restarts a coasting PM motor. The drive short circuits all the three motor phases to make
braking torque in the motor.
Set this parameter to 0.00 to disable the function.
Note:
• Short circuit Braking will let external forces rotate the PM motor. Use DC Injection Braking to prevent motor rotation from external
forces.
• Motor speed and load conditions can make it necessary to install a dynamic braking option on the drive.
■ b2-13: Short Circuit Brake Time @ Stop
No.
(Hex.)
Name Description
Default
(Range)
b2-13
(01BB)
Short Circuit Brake Time @
Stop
Sets the Short Circuit Braking time at stop.
A1-02 = 8: 0.00 s
Other than A1-02 = 8: 0.50
s
(0.00 - 25.50 s)
This function fully stops a PM motor with a large inertia during deceleration and will not let the inertia continue to
rotate the motor.
Short Circuit Braking operates for the time set in b2-13 when output frequency is less than the value set in b2-01
[DC Injection/Zero SpeedThreshold] or E1-09 [Minimum Output Frequency].
Set this parameter to 0.00 to disable the function.
Note:
Motor speed and load conditions can make it necessary to install a dynamic braking option on the drive.
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