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5.2 b: Application
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
191
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b2: DC Injection Braking
b2 parameters determine operation of the DC injection braking and Zero speed control features.
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b2-01: DC Injection Braking Start Frequency
b2 parameters determine operation of the DC Injection Braking and Zero Speed Control features.
The function triggered by parameter b2-01 depends on the control mode that has been selected.
OLV/PM, AOLV/PM, V/f, V/f w/PG and OLV (A1-02 = 0, 1, 2, 5, 6)
For these control modes, parameter b2-01 sets the starting frequency for DC Injection Braking at stop. Once the output
frequency falls below the setting of b2-01, DC Injection Braking is enabled for the time set in parameter b2-04.
Figure 5.15
Figure 5.15 DC Injection Braking at Stop for V/f, V/f w/PG and OLV
Note:
If b2-01 is set to a smaller value than parameter E1-09 (minimum output 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)
For these control modes, parameter b2-01 sets the starting frequency for Zero Speed Control (not position lock) at stop.
Once the output frequency falls below the setting of b2-01, Zero Speed Control is enabled for the time set in parameter
b2-04.
Figure 5.16
Figure 5.16 Zero Speed Control at Stop in CLV and CLV/PM
Note:
If b2-01 is set to lower than the minimum output 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. If set larger than 50%, the carrier
frequency is automatically reduced to 4 kHz.
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. This parameter should
only be increased to 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 when 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.
Note:
Before starting an uncontrolled rotating motor (e.g., a fan motor driven by windmill effect), DC Injection or Speed Search should
be used to either stop the motor or detect its speed before starting it. Otherwise motor stalling and other faults can occur.
No.
Name
Setting Range
Default
b2-01
DC Injection Braking Start Frequency
0.0 to 10.0 Hz
Determined by A1-02
No.
Name
Setting Range
Default
b2-02
DC Injection Braking Current
0 to 100%
50%
No.
Name
Setting Range
Default
b2-03
DC Injection Braking Time at Start
0.00 to 10.00 s
0.00 s
Output
frequency
Time
b2-04
DC Injection
Braking
E1-09 Min. Output
Frequency
b2-01 DC Injection
Braking Start Frequency
Output
frequency
Time
Zero Speed
Control
b2-04
E1-09 Min. Output
Frequency
b2-01 DC Injection
Braking Start Frequency
SIEP_C710636_02B_1_0.book 191 ページ 2015年11月25日 水曜日 午後4時56分