Features and Advantages of Control Methods

This drive has 5 available control methods from which you can select for different applications. , Table 2, and Table 3 give information about the features of each control method.

Table 1. 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 ¹²	Yes	Adjusts speed during regeneration to prevent overvoltage.

Table 2. 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.
Starting Torque	150% / 1 Hz ³	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 ⁴	Rotational, Stationary, and Line-to-Line Resistance	Automatically tunes electrical motor parameters.
Torque Limits ⁴	Yes	Controls maximum motor torque to prevent damage to machines and loads.
Speed Search ⁴	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 ⁴	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) Activate	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	No	Compensates effects of the system inertia to increase the speed precision when the load changes.
KEB Ride-Thru Function ⁴	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 ⁴	Yes	Sets the V/f higher than the setting value during deceleration to increase motor loss and decrease deceleration time.
Overvoltage Suppression Function ⁴²	Yes	Adjusts speed during regeneration to prevent overvoltage.

Table 3. Features and Advantages of OLV/PM, AOLV/PM, and EZOLV Control
Control Method Selection	PM Open Loop Vector Control (OLV/PM)	PM Advanced Open Loop Vector (AOLV/PM)	EZ Open Loop Vector Control (EZOLV)	Notes
Controlled Motor	PM motor		Induction Motors/PM Motors/SynRM (Synchronous Reluctance Motors)	-
Parameter Settings	A1-02 = 5	A1-02 = 6	A1-02 = 8	-
Basic Control	PM Open Loop Vector Control (no speed controller)	PM Open Loop Current Vector Control (with speed controller)	Open Loop Current Vector Control	-
Main Applications	General-purpose variable speed control for PM motors Applications in which a high level of responsiveness and accurate speed control are not necessary.	General-purpose variable speed control for IPM motors Applications in which high-precision speed control and torque limits are necessary.	Low-speed torque applications Example: Fans and pumps	-
Maximum Output Frequency	590 Hz	270 Hz	120 Hz	-
Speed Control Range	1:10	1:10 1:100 ⁵⁶⁷	1:10	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	100% / 5% speed	100% / 5% speed 100% / 0 min^-1 ⁵	100% / 10% speed	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-Tuning⁸	Stationary, Stator Resistance, Rotational	Stationary, Stator Resistance, Rotational	Line-to-Line Resistance	Automatically tunes electrical motor parameters.
Torque Limits ⁸	No	Yes	Yes	Controls maximum motor torque to prevent damage to machines and loads.
Speed Search⁸	Yes	Yes	Yes (Although NOT operation in the reverse direction of the Run command)	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 ⁸	No	Yes (IPM motors only)	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) Activate	No (induction motor-specific function)	No (induction motor-specific function)	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 ⁸	No	Yes	No	Compensates effects of the system inertia to increase the speed precision when the load changes.
KEB Ride-Thru Function ⁸	Yes	Yes	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	No (induction motor-specific function)	No (induction motor-specific function)	No	Sets the V/f higher than the setting value during deceleration to increase motor loss and decrease deceleration time.
Overvoltage Suppression Function ⁸²	Yes	Yes	Yes	Adjusts speed during regeneration to prevent overvoltage.