YASKAWA T1000A Technical Manual page 120

5.2 b: Application
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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.
No.
b2-04
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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.
No.
b2-08
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
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.
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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-
activated, then the drive will use the current level set in b2-10 to perform DC Injection Braking.
No.
b2-10
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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.
No.
b2-12
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.
120
Name
DC Injection Braking Time at Stop
Name
Magnetic Flux Compensation Value
Output frequency
b2-08
Magnetizing Current
Reference
b2-03
Figure 5.15 Magnetic Flux Compensation
Name
DC Injection Braking Current 2
Name
Short Circuit Brake Time at Start
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual
Setting Range
0.00 to 10.00 s
Setting Range
0 to 1000%
E2-03
Time
= 60) and that terminal is
Setting Range
0 to 100%
Setting Range
0.00 to 25.50 s
Default
Determined by A1-02
Default
0%
Default
50%
Default
0.00 s