Yaskawa F7 Drive Overvoltage Suppression - Manual (Page 3)

Date: 09/17/2010, Rev: 09-2010 Page 3 of 9 TM.F7SW.062
3.0 Limitations
a. V/Hz and Open Loop Vector are the only control modes (A1-02 = 0 or 2) that support the Overvoltage
Suppression function. Closed Loop V/F and Closed Loop Vector are available (A1-02 = 1 or 3) but the
Overvoltage Suppression function is disabled.
b. Bi-directional Speed Search. For some applications, when motor loading is extremely light at startup, it
may be necessary to disable the bi-directional speed search feature by setting parameter B3-14 = 0.
4.0 Related Parameters and Functions
4.1 Overvoltage Suppression PI Controller Parameters
Paramete
r
Numb
er
Modbu
s
Addre
ss
Parameter Name
Digital Operator
Display
Description
R
ang
e
Default Cha
nge
Duri
ng Run
Access Level *1
P1-01 0600H
OV Suppression PI
Setpoint
OV Reg Setpoint
*2
This parameter sets the OV
Suppression PI setpoint in
percent of motor torque-
producing current (Iq).
Note: 100% Iq = 100% motor
rated torque.
-100.0 ~
100.0
%
12.0 Yes A
P1-02 0601H
OV Suppression
Proportional Gain
OV Reg Gain
*2
This parameter sets the gain of
the OV Suppression PI
controller. This determines the
responsiveness of the Iq
regulator. A larger setting equals
more responsiveness.
0.00 ~
25.00
2.20 Yes A
P1-03 0602H
OV Suppression Integral
Time
OV Reg I Time
*2
This parameter sets the integral
time of the OV Suppression PI
controller. This determines the
responsiveness of the Iq
regulator. A smaller setting
equals more responsiveness.
0.00 ~
160.00
sec
0.10 Yes A
P1-04 0603H
OV Suppression Positive
Integral Limit
OV Reg I Limit
This parameter sets the positive
limit of the integrator in the OV
Suppression PI controller.
Note: 100% = Fmax (E1-04).
0.0 ~
100.0
%
100.0 No A
P1-05 0604H
OV Suppression Positive
Overall Limit
OV Reg Limit
This parameter sets the positive
limit of the OV Suppression PI
controller (P+I).
Note: 100% = Fmax (E1-04).
Note: A setting of 0.0% disables
the OV Suppression PI
controller.
0.0 ~
100.0
%
100.0 No A
P1-06 0605H
Motor Torque Producing
Current (Iq) Feedback
Filter Time
Feedback Filter
*2
This parameter sets the 1 st
order filter time of the motor
torque-producing current
feedback. A larger setting
equals a more filtered feedback
but less responsiveness.
5 ~
10000
msec
100 Yes A
*1: Access Level (A1-01): Q = “Quick Start”, A = “Advanced”, F = “Factory”. V/F and Open Loop Vector only.