Features And Advantages Of Control Methods - YASKAWA CIPR-GA50C series Technical Manual

1.3 Features and Advantages of Control Methods

1.3 Features and Advantages of Control Methods
This drive has 5 available control methods from which you can select for different applications.
1.6, andTable 1.7 give information about the features of each control method.
Control Method Selection
Controlled Motor
Parameter Settings
Basic Control
Main Applications
Maximum Output Frequency
Speed Control Range
Starting Torque
*1
Auto-Tuning
Torque Limits
*1
Speed Search
*1
Automatic Energy-saving Control
*1
High Slip Braking (HSB)
Feed Forward Control
*1
KEB Ride-Thru Function
*1
Overexcitation Deceleration
*1
Overvoltage Suppression Function
*2
*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.
Control Method Selection
Controlled Motor
Parameter Settings
Basic Control
Main Applications
Maximum Output Frequency
Speed Control Range
24
Table 1.5 Features and Advantages of V/f Control
Open Loop V/f Control
(V/f)
Induction Motor
A1-02 = 0
(Default)
V/f
General-purpose variable speed control to connect more
than one motor to one drive.
590 Hz
1:40
150% / 3 Hz
Rotational and Line-to-Line Resistance (usually not
necessary)
No
Yes
Yes
Yes
No
Yes
Yes
Yes
Table 1.6 Features and Advantages of OLV Control
Open Loop Vector
(OLV)
Induction Motor
A1-02 = 2
Open Loop Current Vector Control
• General-purpose variable speed control
• Applications in which high performance is necessary
without machine encoders
590 Hz
1:100
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).
You must think about drive 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.
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.
Notes
-
-
-
-
-
This is the range of variable control.
When you connect and operate motors in this mode, think about the
increase in motor temperature.
YASKAWA SIEPC71061753A GA500 Technical Manual
Table 1.5, Table