Varispeed F7 Control Methods; Control Methods And Features - YASKAWA Varispeed F7 Instruction Manual

Varispeed F7 Control Methods

Details of the Varispeed F7-Series Inverter control methods and their features are provided in this section.

Control Methods and Features

Varispeed F7-Series Inverters support the following four control methods, allowing the selection of a control
method to suit the required purpose. Table 10.1 provides an overview of the control methods and their fea-
tures.
Control Method
Constant Setting
Basic Control
Main Applications
PG Speed Control Board
(Option)
Speed Control
*1
Range
Speed Control Accu-
*2
racy
Basic
Speed Response
Perfor-
mance Maximum
Output Fre-
quency
Starting
Torque
-2
10
Table 10.1 Overview and Features of Control Methods
V/f Control
A1-02 = 0
(factory setting)
Voltage/frequency
fixed ratio control
Variable speed con-
trol, particularly for
control of multiple
motors with a single
Inverter and for
replacing existing
Inverters
Not required.
1:40
±2 to 3%
*3
Approx. 1 Hz
CT
150 Hz 300 Hz
VT 400 Hz
CT 150%/3 Hz
*4
VT 120%/3 Hz
Open-loop Vector
V/f Control with PG
Control
A1-02 = 1 A1-02 = 2
Voltage/frequency
fixed ratio control Current vector con-
with speed compen- trol without a PG
sation using a PG
Variable speed con-
trol, applications
Applications requir- requiring high perfor-
ing high-precision mance without a PG
speed control using a on the motor side,
PG on the machine and for replacing
side open-loop vector con-
trol of the previous
VS-616G5.
Required (PG-A2 or
Not required.
PG-D2).
1:40
±0.03% ±0.2%
Approx. 1 Hz
150 Hz 300 Hz 150 Hz
400 Hz 400 Hz
150%/3 Hz 150%/0.5 Hz
120%/3 Hz 120%/0.5 Hz
Flux Vector Control
A1-02 = 3
Current vector con-
trol with a PG
Very high-perfor-
mance control with a
PG on the motor side
(simple servodrives,
high-precision speed
control, torque con-
trol, and torque limit-
ing)
Required (PG-B2 or
PG-X2).
1:100 1:1000
±0.02%
5 Hz 40 Hz
300 Hz 150 Hz 300 Hz
400 Hz
150%/0 min
120%/0 min
−1
−1