YASKAWA CIPR-GA50C series Technical Manual page 487

Parameter Settings
A1-02 = 0, 2 [V/f or OLV]
A1-02 = 5, 6, or 8 [OLV/PM, AOLV/PM, or EZOLV]
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b2-02: DC Injection Braking Current
No.
Name
(Hex.)
b2-02 DC Injection Braking
Current
(018A)
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.
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b2-03: DC Inject Braking Time at Start
No.
Name
(Hex.)
b2-03 DC Inject Braking Time at
Start
(018B)
This function stops then restarts a coasting motor and increases motor flux to make high starting torque (a process
called initial excitation). Set this parameter to 0.00 to disable the function.
Note:
To restart a coasting motor, use DC Injection Braking to stop and then restart the motor, or enable Speed Search. Enable DC Injection
Braking or Speed Search to prevent ov [Overvoltage] or oC [Overcurrent] faults.
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b2-04: DC Inject Braking Time at Stop
No.
Name
(Hex.)
b2-04 DC Inject Braking Time at
Stop
(018C)
This function fully stops a motor with a large inertia during deceleration and will not let the inertia continue to
rotate the motor.
Set this parameter to 0.00 to disable the function.
When a longer time is required to stop the motor, increase the value.
YASKAWA SIEPC71061753A GA500 Technical Manual
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 12.19 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.
Parameter b2-01 sets the frequency to start 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 12.20 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.
V/f OLV OLV/PM AOLV/PM EZOLV OLV/PM
Sets the DC Injection Braking current as a percentage of the drive rated current.
V/f OLV OLV/PM AOLV/PM EZOLV OLV/PM
Sets the DC Injection Braking Time at stop.
V/f OLV OLV/PM AOLV/PM EZOLV OLV/PM
Sets the DC Injection Braking Time at stop.
Functions of b2-01
Description
Description
Description
12.3 b: Application
Default
(Range)
50%
(0 - 75%)
Default
(Range)
0.00 s
(0.00 - 10.00 s)
Default
(Range)
Determined by A1-02
(0.00 - 10.00 s)
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