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îš‹ Droop Control Function
Droop control is a function that allows to achieve a load sharing between two motors that drive a single load.
The Droop Control function must be enabled at one inverter only. If by this inverter the torque rises, the speed
is reduced and the other inverter takes over more load. Thereby the load is shared automatically to both
motors.
îš„Related Parameters
îš„Setting the Droop Control Gain
Set the Droop Control gain in parameter b7-01 to the amount of speed reduction when the maximum output
frequency is input and the rated torque is generated (see Fig 6.89). b7-01 is set as percentage of the maximum
output voltage.
Fig 6.89 Droop Control Gain
Droop Control can be disabled by setting the parameter b5-07 to 0.
îš„Setting the Droop Control Delay Time
The Droop Control delay time in parameter b7-02 is used to adjust the responsiveness of droop control.
Increase this setting if oscillations or hunting occur.
Parameter
No.
Name
Factory
Setting
Change
during
Opera-
tion
Control Methods
V/f
V/f with
PG
Open
Loop
Vector
Closed
Loop
Vector
b7-01 Droop Control gain 0.0 Yes No No No A
b7-02 Droop Control delay time 0.05 s No No No No A
b7-01
Torque
Speed
Speed reference
0
100%
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