Features And Advantages Of Control Methods - YASKAWA GA700 Technical Manual

1.3 Features and Advantages of Control Methods

1.3 Features and Advantages of Control Methods
This drive has 9 available control methods from which to select for different applications.
Table 1.7 gives information about the features of each control method.
Table 1.5 V/f and CL-V/f Features and Advantages of Control Methods
Control Method
Selection
Controlled Motor
Parameter Settings A1-02 = 0
Basic Control V/f
General-purpose variable speed
Main Applications control to connect more than one
motor to one drive.
PG Option Card Not necessary
Maximum Output
590 Hz
Frequency
Speed Control Range 1:40
Starting Torque 150% / 3 Hz
Rotational and Line-to-Line
Auto-Tuning
*1
Resistance (usually not necessary)
Torque Limits No
*1
Torque Control No
*1
Droop Control No
*1
Zero Servo Control No
*1
Speed Search Yes
*1
Automatic Energy-
Yes
saving Control
*1
High Slip Braking
Yes
(HSB)
*1
Feed Forward Control
No
*1
KEB Ride-Thru
Yes
Function
*1
26
Open Loop V/f Control
(V/f)
Induction Motor
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
Closed Loop V/f Control
(CL-V/f)
A1-02 = 1
Closed loop V/f control with
speed correction
High-precision speed control with
encoders on machines
Necessary (PG-B3 or PG-X3)
400 Hz
1:40
150% / 3 Hz
Rotational and Line-to-Line
Resistance (usually not necessary)
No
No
No
No
-
Yes
Yes
No
Yes
Table 1.5, Table 1.6
Notes
-
-
-
-
-
-
This is the range of variable control.
When you connect and operate motors in
this method, think about the increase in
motor temperature.
This is the motor torque that the drive can
supply at low speed during start-up and
the related output frequency (rotation
speed).
You must think about drive capacity when
a large quantity of torque is necessary at
low speed.
Automatically tunes electrical motor
parameters.
Controls maximum motor torque to
prevent damage to machines and loads.
Directly controls motor torque to control
tension and other parameters.
Sets load torque slip for motors.
Distributes motor loads.
Locks servos without an external position
controller to prevent movement caused by
external force.
Immediately estimates (or detects) motor
speed and direction when coasting to a
stop to quickly start-up the drive without
stopping the motor.
Automatically adjusts the voltage applied
to motors to maximize motor efficiency
for all load sizes.
Increases motor loss to let the motor
decelerate faster than usual without a
braking resistor. Motor characteristics
have an effect on this function.
Compensates effects of the system inertia
to increase the speed precision when the
load changes.
Quickly and safely stops the motor during
power loss and automatically starts
operation at the previous speed when
restores power without coasting the motor.
and