1.3 Features and Advantages of Control Methods
24 YASKAWA SIEPC71061753C GA500 Technical Manual
1.3 Features and Advantages of Control Methods
This drive has 5 available control methods from which you can select for different applications. Table 1.5, Table
1.6, and Table 1.7 give information about the features of each control method.
Table 1.5 Features and Advantages of V/f Control
Control Method Selection
Open Loop V/f Control
(V/f)
Notes
Controlled Motor Induction Motor -
Parameter Settings
A1-02 = 0
(Default)
-
Basic Control V/f -
Main Applications
• General-purpose variable speed control
• Applications in which more than one motor are
connected to one drive
-
Maximum Output Frequency 590 Hz -
Speed Control Range 1:40
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 150% / 3 Hz
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
*1
Rotational and Line-to-Line Resistance (usually not
necessary)
Automatically tunes electrical motor parameters.
Torque Limits No
Controls maximum motor torque to prevent damage to machines and
loads.
Speed Search
*1
Yes
Immediately estimates (or detects) motor speed and direction when
coasting to a stop to quickly start-up the drive without stopping the motor.
Automatic Energy-saving Control
*1
Yes
Automatically adjusts the voltage that the drive applies to the motor to
maximize motor efficiency for small and large loads.
High Slip Braking (HSB)
*1
Yes
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 No
Compensates effects of the system inertia to increase the speed precision
when the load changes.
KEB Ride-Thru Function
*1
Yes
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.
Overexcitation Deceleration
*1
Yes
Sets the V/f higher than the setting value during deceleration to increase
motor loss and decrease deceleration time.
Overvoltage Suppression Function
*1
*2
Yes Adjusts speed during regeneration to prevent overvoltage.
*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.
*2 Do not use this function with hoist application.
Table 1.6 Features and Advantages of OLV Control
Control Method Selection
Open Loop Vector
(OLV)
Notes
Controlled Motor Induction Motor -
Parameter Settings A1-02 = 2 -
Basic Control Open Loop Current Vector Control -
Main Applications
• General-purpose variable speed control
• Applications in which high performance is necessary
without machine encoders
-
Maximum Output Frequency 590 Hz -
Speed Control Range 1:100
This is the range of variable control.
When you connect and operate motors in this mode, think about the
increase in motor temperature.
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