11.3 b: Application
710 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
◆ b2: DC Injection Braking and Short Circuit Braking
b2 parameters set the DC Injection Braking and Short Circuit Braking functions.
• DC Injection Braking: A braking method that injects DC current into the motor windings. This function should
not be used too frequently, because it generates a fair amount of heat in the motor.
• Short Circuit Braking: A braking method for PM motors.
■ b2-01: DC Injection/Zero SpeedThreshold
No.
(Hex.)
Name Description
Default
(Range)
b2-01
(0189)
DC Injection/Zero
SpeedThreshold
Sets the frequency to start DC Injection Braking, Short Circuit Braking, and
Zero Servo.
Determined by A1-02
(0.0 - 10.0 Hz)
Note:
This parameter is available when b1-03 = 0 [Stopping Method Selection = Ramp to Stop].
When the control method selected in A1-02 [Control Method Selection] changes, the b2-01 function changes.
• A1-02 = 0, 1, 2, or 4 [V/f, CL-V/f, OLV, or AOLV] and n4-72 = 0 [Speed Feedback Mode = Without Encoder]
In these control methods, b2-01 sets the starting frequency for DC Injection Braking at Stop. When the output
frequency is less than or equal to the value set in b2-01, the drive will inject the quantity of DC current set in
b2-02 [DC Injection Braking Current] into the motor for the time set in b2-04 [DC Inject Braking Time at
Stop].
Figure 11.25 DC Injection Braking at Stop
Note:
When b2-01 ≤ E1-09 [Minimum Output Frequency], the drive will start DC Injection Braking from the frequency set in E1-09.
• A1-02 = 5, 6, or 8 [OLV/PM, AOLV/PM, or EZOLV]
In these control methods, b2-01 sets the starting frequency for Short Circuit Braking at Stop. When the output
frequency is less than or equal to the value set in b2-01, the drive will do Short Circuit Braking for the time set
in b2-13 [Short Circuit Brake Time @ Stop]. When b2-04 > 0.00 s, the drive will complete Short Circuit
Braking, then do DC Injection Braking for the time set in b2-04.
Figure 11.26 Short Circuit Braking at Stop
Note:
When b2-01 ≤ E1-09 [Minimum Output Frequency], the drive will start Short Circuit Braking from the frequency set in E1-09. If b2-01
and E1-09 = 0 Hz, the drive will not do Short Circuit Braking.
• A1-02 = 3 or 7 [CLV or CLV/PM] or A1-02 = 4 [AOLV] and n4-72 = 1 [With Encoder]
In these control methods, b2-01 sets the starting frequency for 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 11.27 Zero Speed Control at Stop
Note:
When b2-01 ≤ E1-09 [Minimum Output Frequency], the drive will start Short Circuit Braking from the frequency set in E1-09.
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