8-9-20
Droop Control
If a single mechanical system is driven by multiple motors, and there is a speed difference in each of
the motors, a load unbalance occurs. Droop control is a function for ensuring load balance by provid-
ing drooping characteristics to the motor speed in response to an increase in load.
When the output torque is 100%, the output frequency is subtracted by the frequency set at Droop
Control (3008Hex-1DHex), and when the output torque is 0%, the output frequency is subtracted as a
percentage that is output according to the frequency reference in accordance with the torque actually
being output by the inverter (Output T
orque Monitor (3010Hex-08Hex)).
The set value of Droop Control (3008Hex-1DHex) is around the rated slip frequency of the applicable
motor
.
To enable droop control, turn the DROOP terminal ON.
Parameter No. Function name Data
Default da-
ta
Unit
3008Hex-1DHex Droop Control -60.0 to 0.0 0.0 Hz
3005Hex-02Hex to
3005Hex-06Hex,
3005Hex-63Hex,
3005Hex-64Hex
Input Terminal [DI1] to [DI7]
Function Selection
76: DROOP (Select droop
control)
- -
100% output torque
Freque
ncy
Reference
3008Hex-1DHex(Hz)
Drooping characteristics
Load
Output frequency
Speed (output frequency)
• When using droop control, be sure to perform auto-tuning.
• During droop control for V/f control, the acceleration/deceleration time is enabled for the resultant
frequency of droop control so that tripping does not occur even when there is a sudden change in
load. As a result, the reflection of the frequency corrected during droop control on the motor speed
under the influence of the acceleration/deceleration time is delayed, and the droop control may op-
erate as disabled.
8-9-21
Magnetic Flux Level at Light Load
By setting Magnetic Flux Level at Light Load (3020Hex-4AHex), the magnetic flux of the motor during
a light load can be reduced, and thus, the motor noise can be reduced. This function can be used only
during vector control with speed sensor
.
This is regardless of Load Mode Selection (3004Hex-51Hex).
Parameter No. Function name Data Default data Unit
3020Hex-4AHex
Magnetic Flux Level at Light
Load
10 to 100 100 %
• The magnetic flux command when the Torque Current Command value is less than 50% can be
changed. Set the magnetic flux command when the Torque Current Command value is 0% to Mag-
netic Flux Level at Light Load (3020Hex-4AHex). Refer to the figure below.
8 Other Functions
8-134
M1 Series EtherCAT Type User’s Manual (I670)
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