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5.2 b: Application
212
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
■
b6-01, b6-02: Dwell Reference, Dwell Time at Start
Parameter b6-01 determines the frequency that is held for the time set in b6-02 during acceleration.
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b6-03, b6-04: Dwell Reference, Dwell Time at Stop
Parameter b6-03 determines the frequency that is held for the time set in b6-04 during deceleration.
◆
b7: Droop Control (CLV, CLV/PM)
Droop control is a function for setting the motor rated slip as required. Droop control can automatically balance the load
level between two motors that drive the same load, such as the traverse axis in cranes. It must be activated in one of the
two drives that control these motors. The drive in which Droop control is activated will automatically reduce the speed if
the torque reference rises, and increase the speed if the torque reference falls again, thereby shifting the load from one
motor to the other.
Note:
Disable Feed Forward (n5-01 = 0) whenever using Droop control.
Figure 5.28
Figure 5.28 Droop Control in a Traverse Application
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b7-01: Droop Control Gain
Sets the amount of speed reduction when the torque reference is 100%. The gain is set as a percentage of the maximum
output frequency. A setting of 0.0% disables the Droop control function.
Figure 5.29
Figure 5.29 Droop Control Gain
No.
Name
Setting Range
Default
b6-01
<1> In AOLV/PM and CLV/PM control modes, the setting units and range are expressed as a percent (0.0 to 100.0%) instead of in Hz.
Dwell Reference at Start
0.0 to 400.0 Hz
0.0 Hz
b6-02
Dwell Time at Start
0.0 to 10.0 s
0.0 s
No.
Name
Setting Range
Default
b6-03
<1> In AOLV/PM and CLV/PM control modes, the setting units and range are expressed as a percent (0.0 to 100.0%) instead of in Hz.
Dwell Reference at Stop
0.0 to 400.0 Hz
0.0 Hz
b6-04
Dwell Time at Stop
0.0 to 10.0 s
0.0 s
No.
Parameter Name
Setting Range
Default
b7-01
Droop Control Gain
0.0 to 100.0%
0.0%
B
A
= 90% Load
= 90% Load
B
A
= 100% Load
= 80% Load
Droop Control increases the speed reference in
drive B accomplishing load balance
B
A
= 80% Load
= 100% Load
B
A
= 90% Load
= 90% Load
f
ref_A
= constant
f
ref_A
= constant
f
ref_B
increase
f
ref_B
decrease
Droop Control decreases the speed reference in
drive B accomplishing load balance
Motor A runs faster than B, pulling more load
Motor B runs faster than A, pulling more load
Speed
Torque
100%
Speed reference
Droop control gain
b7-01
0
SIEP_C710636_02B_1_0.book 212 ページ 2015年11月25日 水曜日 午後4時56分