12.3 b: Application
730 YASKAWA SIEPC71061737D GA800 Drive Technical Reference
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 12.24 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 12.25 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.
A1-02 = 3, 7 [CLV, CLV/PM]
Parameter b2-01 sets the frequency to start 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 12.26 Zero Speed Control at Stop
Note:
When b2-01 ≤ E1-09 [Minimum Output Frequency], the drive will start Zero Speed Control from the frequency set in
E1-09.
A1-02 = 4 [AOLV] and n4-72 = 1 [With Encoder]
■ b2-02: DC Injection Braking Current
No.
(Hex.)
Name Description
Default
(Range)
b2-02
(018A)
DC Injection Braking
Current
Sets the DC Injection Braking current as a percentage of the drive rated current.
50%
(0 - 100%)
When the DC Injection Braking current is more than 50%, the drive decreases the carrier frequency to 1 kHz. The
motor rated current determines how much DC Injection Braking current that the drive can use.
The DC Injection Braking current level has an effect on the strength of the magnetic field that locks the motor shaft.
As the current level increases, the motor windings will supply more heat. Do not set this parameter higher than the
level that is necessary to hold the motor shaft.
Note:
When A1-02 = 4 [Control Method Selection = AOLV] and n4-72 = 1 [Speed Feedback Mode = With Encoder], the drive ignores the b2-02
setting and does initial excitation.
■ b2-03: DC Inject Braking Time at Start
No.
(Hex.)
Name Description
Default
(Range)
b2-03
(018B)
DC Inject Braking Time at
Start
Sets the DC Injection Braking Time at stop. Sets the time of Zero Speed Control at start when A1-02
= 3, 7 [Control Method Selection = CLV, CLV/PM].
A1-02 = 4: 0.30 s
Other than A1-02 = 4: 0.00 s
(0.00 - 10.00 s)
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