B2: Dc Injection Braking And Short Circuit Braking - YASKAWA GA700 Technical Manual

11.3 b: Application
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b1-35: Multi-Function DI dead band time
No.
Name
(Hex.)
b1-35 Multi-Function DI
dead band time
(1117)
The multi-function digital input is enabled when the on/off time for multi-function digital inputs is longer than the
time set in b1-35. Set this parameter to prevent malfunctions caused by relay chattering for applications in which
multi-function digital input terminals receive input via relays.
◆

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.
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b2-01: DC Injection/Zero SpeedThreshold
No.
Name
(Hex.)
b2-01 DC Injection/Zero
SpeedThreshold
(0189)
Note:
This parameter is available when b1-03 = 0 [Stopping Method Selection = Ramp to Stop].
The function triggered by b2-01 depends on the control mode that has been selected with A1-02 [Control Method
Selection].
• When A1-02 = 0, 1, 2, or 4 [V/f Control, Closed Loop V/f Control, Open Loop Vector Control, or Advanced
OpenLoop Vector Control] and n4-72 = 0 [PG Mode = WithOut PG]
For these control modes, b2-01 sets the starting frequency for DC Injection Braking at Stop. If the output
frequency falls below or is equal to the value set in b2-01, then the drive will inject the amount 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].
Note:
The drive will begin DC Injection Braking from the frequency set in E1-09 [Minimum Output Frequency] if b2-01 is set to a value
lower than or equal to what is set in E1-09.
• When A1-02 = 5, 6, or 8 [PM Open Loop Vector Control, PM Advanced Open Loop Vector, or EZ Open Loop
Vector Control]
For these control modes, b2-01 sets the starting frequency for Short Circuit Braking at Stop. If the output
frequency falls below or is equal to the value set in b2-01, then the drive will perform Short Circuit Braking for
the time set in b2-13 [Short Circuit Brake Time @ Start]. If b2-04 has been set to a value greater than 0 Hz, then
the drive will perform DC Injection Braking for the time set in b2-04 once Short Circuit Braking is complete.
604
V/f CL-V/f OLV CLV AOLV
Sets the dead band time for multi-function digital inputs.
V/f CL-V/f OLV CLV AOLV
Sets the frequency to begin DC Injection Braking, Short Circuit Braking,
and Zero Servo.
Figure 11.24 DC Injection Braking at Stop
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Default Setting
(Range)
0.0 ms
(0.0 to 100.0 ms)
Default Setting
(Range)
Determined by A1-02
(0.0 - 10.0 Hz)