B7: Droop Control (Clv, Clv/Pm) - YASKAWA AC Drive-A1000 Technical Manual

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b7: Droop Control (CLV, CLV/PM)

Note: PM motor control modes are not available on 600 V class drives, CIMR-Ao5oooooooo.
Droop control automatically balances the load level between two motors driving the same load. Droop control must be activated
in one of the drives controlling these motors. The drive in which Droop control is activated shifts the load from one motor to
another by automatically reducing the speed when the torque reference rises, and automatically increasing the speed when the
torque reference falls.
Note: Disable Feed Forward (n5-01 = 0) whenever using Droop control.
Motor A runs faster than B, pulling more load
A
= 100% Load
B
= 80% Load
Droop Control increases the speed reference in
drive B accomplishing load balance
n
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.
No.
b7-01
n b7-02: Droop Control Delay Time
Adjusts the responsiveness of Droop control. Reduce the setting if the reaction time is too long, and increase the setting if
hunting occurs.
No.
b7-02
n b7-03: Droop Control Limit Selection
Enables or disables the droop control limit.
No.
b7-03
Setting 0: Disabled
Setting 1: Enabled
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
A
= 90% Load
f = constant
ref_A
f increase
ref_B
B
= 90% Load
Figure 5.26 Droop Control in a Traverse Application
Parameter Name
Droop Control Gain
Speed
Speed reference
0
Figure 5.27 Droop Control Gain
Parameter Name
Droop Control Delay Time
Parameter Name
Droop Control Limit Selection
Motor B runs faster than A, pulling more load
A A
= 80% Load
f = constant
ref_A
f decrease
ref_B
B B
= 100% Load
Droop Control decreases the speed reference in
drive B accomplishing load balance
Setting Range
0.0 to 100.0%
Droop control gain
b7-01
Torque
100%
Setting Range
0.03 to 2.00 s
Setting Range
0, 1
5.2 b: Application
= 90% Load
= 90% Load
Default
0.0%
Default
0.05 s
Default
1
5
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