YASKAWA Varispeed CIMR-G7A User Manual

Individual Functions
6-137
 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.
Related Constants
* 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.
Con-
stant
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
Display
V/f
V/f
with
PG
Open
Loop
Vector
1
Flux
Vec-
tor
Open
Loop
Vector
2
N5-01
Feed for-
ward control
selection
Select the feed forward control.
0: Disabled
1: Enabled
0 or 1
0
*1
No No No No A A
Feedfoward
Sel
N5-02
Motor accel-
eration time
Set the time required to accelerate the
motor at the rated torque (T
100
) to the rated
speed (Nr).
J: GO
2
/4, P: Motor rated output
However,
0.001
to
10.000
0.178 s
*2
No No No No A A
Motor Accel
Time
N5-03
Feed for-
ward propor-
tional gain
Set the proportional gain for feed forward
control.
Speed reference response will increase as
the setting of N5-03 is increased.
0.00 to
100.00
1.0 No No No No A A
Feedfoward
Gain
Overshooting
Rotation
speed
(min
-1
)
Time(s)
Conventional speed control
Rotation
speed
(min
-1
)
Overshooting when acceleration completed
is being suppressed
Time(s)
Feed forward control
Overshooting control effect
2π · J [kgm
2
] · Nr [r/min]
ta =
60 · T
100
[N · m]
[s]
T
100
=
× 10
3
[N · m]
60
2π
·
P [kW]
Nr [n/min]

YASKAWA Varispeed CIMR-G7A Specifications

General

Brand	YASKAWA
Model	Varispeed CIMR-G7A
Category	Inverter
Language	English