1.2 Features and Advantages of Control Methods
24 SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
Table 1.5 OLV, CLV and AOLV Features and Advantages of Control Methods
Control Method
Selection
Open Loop Vector Control
(OLV)
Closed Loop Vector Control
(CLV)
Advanced Open Loop Vector
Control
(AOLV)
Notes
Controlled Motor Induction Motor -
Parameter Settings
A1-02 = 2
(Default)
A1-02 = 3 A1-02 = 4 -
Basic Control
Open Loop Current Vector
Control
Closed Loop Current Vector
Control
Open Loop Current Vector
Control
-
Main Applications
• General-purpose variable speed
control
• Applications in which high
performance is necessary
without machine encoders
Very high-performance control
with motor encoders
Example: High-precision speed
control, torque control, torque
limits
Sensorless vector control with
speed control
• General-purpose variable speed
control
• Applications in which high
performance is necessary
without machine encoders
-
PG Option Card Not necessary Necessary (PG-B3 or PG-X3) Not necessary -
Maximum Output
Frequency
590 Hz 400 Hz 120 Hz -
Speed Control Range 1:200 1:1500 1:200
This is the range of variable control.
When you connect and operate motors in
this mode, think about the increase in
motor temperature.
Starting Torque 200% / 0.3 Hz
*1
200% / 0 min
-1
*1
200% / 0.3 Hz
*1
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.
Auto-Tuning
*2
Rotational, Stationary, and Line-
to-Line Resistance
Rotational, Stationary, and Line-
to-Line Resistance
Rotational, Stationary, and Line-
to-Line Resistance
Automatically tunes electrical motor
parameters.
Torque Limits
*2
Yes Yes Yes
Controls maximum motor torque to
prevent damage to machines and loads.
Torque Control
*2
No Yes
Yes (Although NOT for speeds
below 10% of rated value)
Directly controls motor torque to control
tension and other parameters.
Droop Control
*2
No Yes Yes
Sets load torque slip for motors.
Distributes motor loads.
Zero Servo Control
*2
No Yes No
Locks servos without an external position
controller to prevent movement caused by
external force.
Speed Search
*2
Yes - Yes
Immediately estimates (or detects) motor
speed and direction when coasting to a
stop to quickly start-up the drive without
stopping the motor.
Not necessary when feedback is used.
Automatic Energy-
saving Control
*2
Yes Yes No
Automatically adjusts the voltage applied
to motors to maximize motor efficiency for
all load sizes.
High Slip Braking
(HSB)
*2
No No No
Increases motor loss to let the motor
decelerate faster than usual without a
braking resistor. Motor characteristics have
an effect on this function.
Feed Forward Control
*2
No Yes Yes
Compensates effects of the system inertia
to increase the speed precision when the
load changes.
KEB Ride-Thru
Function
*2
Yes Yes Yes
Quickly and safely stops the motor during
power loss and automatically starts
operation at the previous speed when
restores power without coasting the motor.
Overexcitation
Deceleration
*2
Yes Yes Yes
Sets the V/f higher than the setting value
during deceleration to increase motor loss
and decrease deceleration time.
Overvoltage
Suppression Function
*2 *3
Yes Yes Yes
Adjusts speed during regeneration to
prevent overvoltage.
*1 Select the drive capacity accordingly.
*2 Note these points when you use this function:
• When you can decouple the motor and machine for a test run, use Rotational Auto-Tuning. You must make adjustments to the
control in the range where there is no vibration in the machine after Rotational Auto-Tuning.
• For vector control, use a 1:1 drive to motor ratio. You cannot use vector control when more than one motor is connected to one
drive. Select a drive capacity so that the motor rated current is 50% to 100% of the drive rated current. If the carrier frequency is
too high, the drive rated current is derated.
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