YASKAWA FSDrive-MV1000 - b7: Droop Control (CLV)

2.2 b: Application
YASKAWA ELECTRIC TOEP C710687 03B FSDrive-MV1000 Parameter Guide 127
u b7: Droop Control (CLV)
Droop control automatically balances the load level between two motors that drive the same load, such as in a traverse
crane applications. Droop control 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 automatically increase the
speed if the torque reference falls again to shift the load from one motor to the other.
Note: Disable Feed Forward (n5-01 = 0) whenever using Droop control.
Figure 2.20
Figure 2.20 Droop Control in a Traverse Application
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.
Figure 2.21
Figure 2.21 Droop Control Gain
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.
n
b7-03: Droop Control Limit Selection
Enables or disables the droop control limit.
Setting 0: Disabled
Setting 1: Enabled
No. Name Setting Range Default
b7-01 Droop Control Gain 0.0 to 100.0% 0.0%
No. Name Setting Range Default
b7-02 Droop Control Delay Time 0.03 to 2.00 s 0.05 s
No. Name Setting Range Default
b7-03 Droop Control Limit Selection 0 or 1 1
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
common_TMonly
Motor speed
Torque
100%
Speed reference
b7-01
(Droop control gain)
0
common_TMonly
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