Increasing The Speed Reference Response (Feed Forward Control) - YASKAWA varispeed G7 CIMR-G7B series Instruction Manual

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 2 controls.
Related Constants
Con-
stant
Number
N5-01
N5-02
N5-03
* 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.
-142
6
Overshooting when acceleration completed
is being suppressed
Rotation
speed
(min )
-1
Time(s)
Feed forward control
Overshooting control effect
Fig 6.77 Overshooting Control Effect
Name
Description
Display
Feed forward
Select the feed forward control.
control selec-
0: Disabled
tion
1: Enabled
FF 控制选择
Motor accelera- Set the time required to acceler-
tion time ate the motor at the rated torque
(T ) to the rated speed (Nr).
100
2
J: GD /4, P: Motor rated output
2π J [kgm 2 ] Nr [min -1 ]
ta =
60 T 100 [N m]
电机加速时间
However,
60 P [kW]
T 100 =
Nr [min -1 ]
2 π
Feed forward Set the proportional gain for feed
proportional forward control.
gain Speed reference response will
increase as the setting of N5-03 is
前馈控制 P 增益
increased.
Rotation
speed
(min )
-1
Time(s)
Conventional speed control
Setting Factory
Range Setting
0
0 or 1
*1
0.001
0.178
to
*2
s
[s]
10.000
× 10 3 [N m]
0.00 to
1.0
100.00
Overshooting
Control Methods
Change
Open
during
V/f Flux
Loop
Opera-
V/f with Vec-
Vector
tion
PG tor
1
No No No No A
No No No No A
No No No No A
MEMO
Open
BUS
Loop
Regis-
Vector
ter
2
A 5B0H
A 5B1H
A 5B2H