Frequency Reference
H28(Hz)
Drooping
characteristics
Load
Output frequency
Speed (output frequency)
100%
motor torque
• 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 operate as
disabled.
7-9-21
Magnetic Flux Level at Light Load
By setting Magnetic Flux Level at Light Load (H173), 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 vec-
tor control with speed sensor.
This is regardless of Load Mode Selection (F80).
Parameter No. Function name Data Default data Unit
H173
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 T
orque Current Command value is 0% to Mag-
netic Flux Level at Light Load (H173). Refer to the figure below.
F
lux comman
d
100%
Magneti
c Flux Le
v
el
(H173
)
0%
0%
50%
Tor
que
cur
rent c
o
mmand
7 Other Functions
7-150
M1 Series Standard Type User's Manual (I669)
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