Droop Control; Magnetic Flux Level At Light Load - Omron M1 Series User Manual

8 Other Functions
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 Torque 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.
3008Hex-1DHex
3005Hex-02Hex to
3005Hex-06Hex,
3005Hex-63Hex,
3005Hex-64Hex
• 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.
3020Hex-4AHex
• 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.
8-134
Function name

Droop Control

Input Terminal [DI1] to [DI7]
Function Selection
Speed (output frequency)
Frequency
Reference
Output frequency
Function name
Magnetic Flux Level at Light
Load
Data
-60.0 to 0.0
76: DROOP (Select droop
control)
3008Hex-1DHex(Hz)
Drooping characteristics
Load
100% output torque
Data
10 to 100
M1 Series EtherCAT Type User's Manual (I670)
Default da-
Unit
ta
0.0 Hz
- -
Default data Unit
100 %