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Increasing the Speed Reference Response (Feed Forward Control)
Use feed forward control to increase the responsiveness to speed references. This function is effective for
machines for which the ASR gain cannot be increased to a large value because doing so would result in vibra-
tions. There is also the additional effect of making the system less prone to overshoot. This function is valid
only in flux vector and open-loop vector controls.
Rotation
speed
(min
-1
)
Feed forward control
Related Constants
Name
Con-
stant
Display
Number
Feed for-
ward control
Select the feed forward control.
selection
N5-01
0: Disabled
1: Enabled
Feedfoward
Sel
Motor accel-
Set the time required to accelerate the
eration time
motor at the rated torque (T
speed (Nr).
J: GO
N5-02
2π · J [kgm 2 ] · Nr [r/min]
Motor Accel
ta =
Time
However,
T 100 =
Feed for-
Set the proportional gain for feed forward
ward propor-
control.
tional gain
N5-03
Speed reference response will increase as
Feedfoward
the setting of N5-03 is increased.
Gain
* 1. When the control method is changed, the factory setting will change. The flux vector factory setting is given.
* 2. The factory setting depends on the Inverter capacity. The value for a 200 V Class Inverter of 0.4 kW is given.
Overshooting when acceleration completed
is being suppressed
Rotation
speed
(min
-1
)
Time(s)
Conventional speed control
Overshooting control effect
Description
) to the rated
100
2
/4, P: Motor rated output
[s]
60 · T 100 [N · m]
60
P [kW]
× 10 3 [N · m]
·
Nr [n/min]
2π
Overshooting
Time(s)
Change
Setting
Factory
during
Range
Setting
Opera-
V/f
tion
0
0 or 1
No
No
*1
0.001
0.178 s
to
No
No
*2
10.000
0.00 to
1.0
No
No
100.00
Individual Functions
Control Methods
Open
Open
V/f
Flux
Loop
Loop
with
Vec-
Vector
Vector
PG
tor
1
2
No
No
A
A
No
No
A
A
No
No
A
A
137
6-
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