5.2 b: Application
120 YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual
n b2-04: DC Injection Braking Time at Stop
Sets the time of DC Injection Braking (Zero Speed Control when in CLV and CLV/PM) at stop. Used to completely stop
a motor with high inertia load after ramp down. Increase the value if the motor still coasts by inertia after it should have
stopped. Disabled when set to 0.00 s.
n
b2-08: Magnetic Flux Compensation Value
Sets the magnetic flux compensation at start as a percentage of the no-load current value (E2-03). This function allows
better more flux to develop, making it easier to start machines that require high starting torque or motors with a large
rotor time constant.
When a Run command is issued, the DC current level injected into the motor changes linearly from the level set to b2-08
to E2-03 within the time set to b2-03.
Figure 5.15
Figure 5.15 Magnetic Flux Compensation
Note that the level of the DC current injected to the motor is limited to 80% of the drive rated current or to the motor
rated current, whichever value is smaller.
Note: 1. If b2-08 is set below 100%, it can take a relatively long time for flux to develop.
2. If b2-08 is set to 0%, the DC current level will be the DC Injection current set to b2-02.
3. As DC Injection can generate a fair amount of noise, b2-08 may need to be adjusted to keep noise levels acceptable.
n b2-10: DC Injection Braking Current 2
Set as a percentage of the drive rated current. If b2-10 is greater than 50%, the carrier frequency is automatically changed
to 1 kHz. Note that the motor rated current limits the amount of current that can be used for DC Injection Braking.
If one of the multi-function input terminals is set for DC Injection Braking 2 (H1- = 60) and that terminal is
activated, then the drive will use the current level set in b2-10 to perform DC Injection Braking.
n
b2-12: Short Circuit Brake Time at Start
Short Circuit Braking can be used in OLV/PM and AOLV/PM. By shorting all three motor phases, it produces a braking
torque in the motor and can be used to stop a coasting motor before starting it again.
Parameter b2-12 sets the time for Short-Circuit Brake operation at start. Disabled when set to 0.00 s.
Note: Short Circuit Braking cannot prevent a PM motor from being rotated by an external force. To prevent the load from rotating the
motor, use DC Injection.
No. Name Setting Range Default
b2-04 DC Injection Braking Time at Stop 0.00 to 10.00 s Determined by A1-02
No. Name Setting Range Default
b2-08 Magnetic Flux Compensation Value 0 to 1000% 0%
No. Name Setting Range Default
b2-10 DC Injection Braking Current 2 0 to 100% 50%
No. Name Setting Range Default
b2-12 Short Circuit Brake Time at Start 0.00 to 25.50 s 0.00 s
E2-03
Time
b2-03
Magnetizing Current
Reference
b2-08
Output frequency
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