YASKAWA AC Drive-A1000 - Page 134

Output
frequency
Time
DC Injection
Braking
b2-04b2-13
Short Circuit
Braking
E1-09 Min. Frequency
b2-01 Zero Speed Level
Figure 5.13 Short-Circuit Braking at Stop in OLV/PM and AOLV/PM
Note: If b2-01 is set to a smaller value than parameter E1-09 (minimum frequency), then DC Injection Braking will begin as soon as the frequency
falls to the value set to E1-09.
CLV and CLV/PM (A1-02 = 3, 7)
Note:
PM motor control modes are not available on 600 V class drives, CIMR-Ao5oooooooo.
For these control modes, parameter b2-01 sets the starting frequency for Zero Speed Control (not position lock) at stop. When
the output frequency falls below the setting of b2-01, Zero Speed Control is enabled for the time set in parameter b2-04 provided
b1-05 is set to 0.
Output
frequency
Time
Zero Speed
Control
b2-04
E1-09 Min. Frequency
b2-01 Zero Speed Level
Figure 5.14 Zero Speed Control at Stop in CLV and CLV/PM
Note: If b2-01 is set lower than the minimum frequency (E1-09), then Zero Speed Control begins at the frequency set to E1-09.
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b2-02: DC Injection Braking Current
Sets the DC Injection Braking current as a percentage of the drive rated current. The carrier frequency is automatically reduced
to 1 kHz when this parameter is set to more than 50%.
No. Name Setting Range Default
b2-02 DC Injection Braking Current 0 to 100% 50%
The level of DC Injection Braking current 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.
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b2-03: DC Injection Braking Time at Start
Sets the time of DC Injection Braking (Zero Speed Control in CLV and CLV/PM) at start. Used to stop a coasting motor before
restarting it or to apply braking torque at start. Disabled when set to 0.00 s.
No. Name Setting Range Default
b2-03 DC Injection Braking Time at Start 0.00 to 10.00 s 0.00 s
Note: Before starting an uncontrolled rotating motor (e.g., a fan motor driven by windmill effect), use DC Injection or Speed Search to stop the motor
or detect motor speed before starting it. Otherwise, motor stalling and other faults can occur.
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b2-04: DC Injection Braking Time at Stop
Sets the time of DC Injection Braking (Zero Speed Control 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. Name Setting Range Default
b2-04 DC Injection Braking Time at Stop 0.00 to 10.00 s
Determined by
A1-02
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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 for the
development of more flux to facilitate starting machines that require high starting torque or motors with a large rotor time
constant.
5.2 b: Application
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YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual