YASKAWA GA700 Series Technical Manual page 28

1.3 Features and Advantages of Control Methods
Table 1.6 OLV, CLV and AOLV Features and Advantages of Control Methods
Open Loop Vector
Control Method
Selection
Controlled Motor
A1-02 = 2
Parameter Settings
(Default)
Open Loop Current Vector
Basic Control
Control
• General-purpose variable speed
control
Main Applications
• Applications in which high
performance is necessary
without machine encoders
PG Option Card Not necessary
Maximum Output
590 Hz
Frequency
Speed Control Range 1:200
Starting Torque 200% / 0.3 Hz
Rotational, Stationary, and Line-
*3
Auto-Tuning
to-Line Resistance
*3
Torque Limits Yes
*3
Torque Control No
*3
Droop Control No
*3
Zero Servo Control No
*3
Speed Search Yes
Automatic Energy-
Yes
*3
saving Control
High Slip Braking
No
*3
(HSB)
Feed Forward Control
No
*3
KEB Ride-Thru
Yes
*3
Function
Overexcitation
Yes
*3
Deceleration
Overvoltage
Suppression Function Yes
*3 *4
*1 If you operate the drive at a frequency lower than n4-70 [Speed Command Comp @ Low Freq] (default setting: 1.00 Hz), the motor
can rotate at a frequency about 1/2 of n4-70. Set E1-09 > 0 [Minimum Output Frequency > 0] to not let the motor to rotate at a lower
frequency than the n4-70 setting. When the frequency reference ≤ E1-09, the drive output will turn OFF.
*2 Select the drive capacity and motor capacity correctly for the application.
28
Closed Loop Vector
(OLV) (CLV)
Induction Motor
A1-02 = 3
Closed Loop Current Vector
Control
Very high-performance control
with motor encoders
Example: High-precision speed
control, torque control, torque
limits
Necessary (PG-B3 or PG-X3)
400 Hz
1:1500
*2
200% / 0 min -1
Rotational, Stationary, and Line-
to-Line Resistance
Yes
Yes
Yes
Yes
-
Yes
No
Yes
Yes
Yes
Yes
Advanced Open Loop Vector
Control
(AOLV)
A1-02 = 4
Open Loop Current Vector
Control
Sensorless vector control with
speed control
• General-purpose variable speed
control
• Applications in which high
performance is necessary
without machine encoders
Not necessary
120 Hz
1:200
*2 *2
200% / 0.3 Hz
Rotational, Stationary, and Line-
to-Line Resistance
Yes
Yes (Although NOT low speeds of
approximately 10% or less)
Yes
No
Yes
No
No
Yes
Yes
Yes
Yes
YASKAWA SIEPC71061705H GA700 Series Technical Manual
*1
Notes
-
-
-
-
-
-
This is the range of variable control.
When you connect and operate motors in
this mode, 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).
When a large quantity of torque is
necessary at low speed, you must think
about drive capacity and motor capacity.
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 that the
drive applies to the motor to maximize
motor efficiency for small and large loads.
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 the
drive applies power again without coasting
the motor.
Sets the V/f higher than the setting value
during deceleration to increase motor loss
and decrease deceleration time.
Adjusts speed during regeneration to
prevent overvoltage.