12.3 b: Application
654 YASKAWA SIEPC71061705H GA700 Series Technical Manual
When the on/off time for MFDIs is longer than the time set in b1-35, the drive activates the MFDI. Set this
parameter to prevent malfunctions caused by relay chattering for applications in which relays send input to MFDI
terminals.
◆ 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, or Zero Servo near the
end of a stop ramp.
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.
Parameter Settings Functions of b2-01
A1-02 = 0, 1, 2 [V/f, CL-V/f, OLV] Parameter b2-01 sets the frequency to start 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 12.25 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 = 4 [AOLV] and n4-72 = 0 [Speed Feedback
Mode = With Encoder]
A1-02 = 5, 6, 8 [OLV/PM, AOLV/PM, EZOLV] Parameter b2-01 sets the frequency to start 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 12.26 Short Circuit Braking at Stop
Note:
When b2-01 ≤ E1-09, 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.
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