Increasing The Speed Reference Response (Feed Forward Control) (Spec: E Or Later Only) - YASKAWA Varispeed F7 Instruction Manual

Increasing the Speed Reference Response (Feed Forward Control)
(SPEC: E or Later Only)
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 control.
Rotation
speed
(min )
-1
Feed forward control
Related Constants
Con-
Name
stant
Number
Feed forward Select the feed forward control.
N5-01 control selec- 0: Disabled
tion 1: Enabled
Set the time required to acceler-
ate the motor at the rated torque
(T
100
J: GD
Motor accel-
N5-02
2π J [kgm 2 ] Nr [min -1 ]
eration time
ta =
However,
T 100 =
Set the proportional gain for
Feed forward feed forward control.
N5-03 proportional Speed reference response will
gain increase as the setting of N5-03
is increased.
Sets the response frequency to a
speed command in units of 0.01
Response fre-
Hz.
quency for
N5-04 Used when the machine rigidity
speed com-
is high and the N5-03 is cor-
mand
rectly adjusted.
Usually, setting is not required.
* The factory setting depends on the Inverter capacity. The value for a 200 V Class Inverter for 0.4 kW is given.
Overshooting when acceleration completed
is being suppressed
Rotation
speed
(min )
-1
Time(s)
Conventional speed control
Overshooting control effect
Setting
Description
Range
0 or 1
) to the rated speed (Nr).
2
/4, P: Motor rated output
0.001 to
10.000
[s]
60 T 100 [N m]
60 P [kW]
× 10 3 [N m]
Nr [min -1 ]
2
0.00 to
100.00
0.00 to
50.00
Overshooting
Time(s)
Control Methods
Change
Open
Factory during
V/f
Loop
Setting Opera-
V/f with
Vec-
tion
PG
0 No No No
*
No No No
0.178 s
1.0 No No No
40.00 No No No
Individual Functions
MEMO
BUS
Flux
Regis-
Vec-
ter
tor
tor
No A 5B0H
No A 5B1H
No A 5B2H
No A 5B3H
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