Control Method Type And Corresponding Features - YASKAWA CR700 Technical Manual

1.4 Control Method Type and Corresponding Features

1.4

Control Method Type and Corresponding Features

This drive has 5 available control methods from which to select for different applications. The following table
give information about the features of each control method.
Control Method
Controlled Motor
Parameter Settings A1-02 = 0
Basic Control V/f
General-purpose variable speed control for
multiple motors in particular (applications
Main Applications
connecting multiple motors to a single
drive)
Encoder Option Card Not necessary
Maximum Output Frequency 590 Hz
Speed Control Range 1:40
Starting Torque 150% / 3 Hz
Line-to-Line Resistance (usually, not
Auto-Tuning
necessary)
Torque Limits No
Droop Control No
Zero Servo Control No
Feed Forward Control No
Overexcitation Deceleration
Yes
*1
*1 Motor loss increases during overexcitation braking and high-slip braking. Use a maximum braking frequency of 5% ED and a
maximum braking time of 90 s. Use overexcitation braking to decelerate over a shorter time at a pre-determined speed.
Open Loop Vector Control
Control Method
Controlled Motor
A1-02 = 2
Parameter Settings
(Default)
Open Loop Current Vector
Basic Control
Control
• General-purpose variable speed
control
Main Applications
• Applications that require high-
performance without machine
encoders
Encoder Option Card Not necessary
Maximum Output
590 Hz
Frequency
Speed Control Range 1:200
Starting Torque 200% / 0.3 Hz
26
V/f Control
(V/f)
Induction Motor
Closed Loop Vector Control
(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 limits
Necessary (PG-B3 or PG-X3)
400 Hz
1:1500
*1
200% / 0 min
-1
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
Line-to-Line Resistance (usually, not
necessary)
No
No
No
No
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 that require high-
performance without machine
encoders
Not necessary
120 Hz
1:200
*1 *1
200% / 0.3 Hz
YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual
Notes
-
-
-
-
-
-
Represents the range of variable control. (Keep
increases in motor temperature in mind when
connecting and running motors in this manner.)
This is the motor torque that can be generated at low
speed during startup and the corresponding output
frequency (rotation speed). Drive capacity must be
considered if significant torque is required at low
speed.
Automatically tunes electrical motor parameters.
Controls maximum motor torque to protect machines
and loads.
Sets load torque slip for motors. Used to distribute
motor loads.
Locks servos without an external position controller to
prevent movement caused by external force.
Improves speed accuracy when the load changes by
compensating effects of the system inertia.
Decreases the deceleration time by increasing motor
loss by setting V/f higher than the setting value during
deceleration.
Notes
-
-
-
-
-
-
Represents the range of variable control.
(Keep increases in motor temperature in
mind when connecting and running motors
in this manner.)
This is the motor torque that can be
generated at low speed during startup and
the corresponding output frequency
(rotation speed). Drive capacity must be
considered if significant torque is required
at low speed.