YASKAWA GA700 Technical Manual page 605

Note:
The drive will begin Short Circuit Braking from the frequency set in E1-09 if b2-01 is set to a value lower than or equal to what is set in
E1-09. The drive will not perform Short Circuit Braking if both b2-01 and E1-09 are set to 0 Hz.
• When A1-02 = 3 or 7 [Closed Loop Vector Control or PM Closed Loop Vector Control] or when A1-02 = 4
[Advanced OpenLoop Vector Control] and n4-72 = 1 [With PG]
For these control modes, b2-01 sets the starting frequency for Zero Speed Control at Stop. If the output
frequency falls below or is equal to the value set in b2-01, then the drive will perform Zero Speed Control for
the time set in b2-04.
Note:
The drive will begin Zero Speed Control from the frequency set in E1-09 if b2-01 is set to a value lower than or equal to what is set in
E1-09.
■
b2-02: DC Injection Braking Current
No.
Name
(Hex.)
b2-02 DC Injection Braking
Current
(018A)
The drive lowers the carrier frequency to 1 kHz when the DC Injection Braking current is set higher than 50%.
The amount of DC Injection Braking current that can be used is limited by the motor rated current.
The current level used for DC Injection Braking affects the strength of the magnetic field attempting to lock the
motor shaft. Increasing the current level will increase the amount of heat generated by the motor windings. Do not
set this parameter higher than the level necessary to hold the motor shaft.
Note:
The setting of b2-02 is ignored, and initial excitation is performed when A1-02 = 4 [Control Method Selection = Advanced OpenLoop
Vector Control] and n4-72 = 1 [PG Mode = With PG].
■
b2-03: DC Inject Braking Time at Start
No.
Name
(Hex.)
b2-03 DC Inject Braking
Time at Start
(018B)
This function is used to stop a coasting motor and restart it, or to increase motor flux to create high starting torque
(a process called initial excitation). A setting of 0.00 disables this function.
Note:
To restart a coasting motor, either use DC Injection Braking to stop and then restart the motor, or enable Speed Search. DC Injection
Braking may trigger ov [Overvoltage] or oC [Overcurrent].
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Figure 11.25 Short Circuit Braking at Stop
Figure 11.26 Zero Speed Control at Stop
V/f CL-V/f OLV CLV AOLV
Sets the DC Injection Braking current as a percentage of the drive rated
current.
V/f CL-V/f OLV CLV AOLV
Sets the DC Inject Braking Time at start. Configures the zero speed control
at start when using Closed Loop Vector Control, Advanced Open Loop
Vector Control, or Closed Loop Vector Control for PM.
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
11.3 b: Application
Default
(Range)
50%
(0 - 100%)
Default Setting
(Range)
A1-02 = 4: 0.03 s
Other than A1-02 =
4: 0.00 s
(0.00 - 10.00 s)
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