11.3 b: Application
712 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
Figure 11.28 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 will make a loud audible 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 restarts a stopped PM motor. The drive short circuits all 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.
■ b2-18: Short Circuit Braking Current
No.
(Hex.)
Name Description
Default
(Range)
b2-18
(0177)
Short Circuit Braking
Current
Sets the Short Circuit Braking Current as a percentage of the motor rated
current.
100.0%
(0.0 - 200.0%)
The Short Circuit Braking current cannot be higher than the drive rated current, although a higher current level
can be set using b2-18. The maximum rated current is 120% when the drive is set for Normal Duty (C6-01 = 1
[Normal Duty Rating]). The maximum rated current is 150% when the drive is set for Heavy Duty (C6-01 = 0
[Heavy Duty Rating]).
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