Features And Advantages Of Control Methods - YASKAWA GA800 Series Technical Reference

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 1.6 give information about the features of each control method.
Control method selection
Controlled Motor
Parameter Setting A1-02 = 0
Basic Control V/f
General-purpose variable speed control to
Main Applications
connect more than one motor to one drive.
PG Option Card Not necessary
Maximum Output Frequency 590 Hz
Speed Control Range 1:40
Starting Torque 150% / 3 Hz
Rotational and Line-to-Line Resistance
*1
Auto-Tuning
(usually not necessary)
*1
Torque Limits No
*1
Torque Control No
*1
Droop Control No
*1
Zero Servo Control No
*1
Speed Search Yes
Automatic Energy-saving
Yes
*1
Control
*1
High Slip Braking (HSB) Yes
*1
Feed Forward Control No
*1
KEB Ride-Thru Function Yes
Overexcitation Deceleration
Yes
*1
Overvoltage Suppression
Yes
*1
Function
*1 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.
• 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 seconds. After you start high-slip braking, you cannot restart the motor until it stops. Use overexcitation
braking to decelerate over a shorter time at a pre-determined speed.
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Table 1.4 V/f and CL-V/f Features and Advantages of Control Methods
V/f Control
(V/f)
Induction Motor
V/f Control with Encoder
(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
Yes
Yes
YASKAWA SIEPC71061737B GA800 Drive Technical Reference
Table 1.4, Table
Notes
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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).
You must think about drive capacity and motor 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.
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.
1.5, and