6.2
Open-loop Vector Control
- 17
6.2
Open-loop Vector Control
Open-loop vector control is vector control without a pulse generator input. Autotuning is the only setting for
basic operation with open-loop vector control.
Always perform autotuning for motor unit separately before vector control operation.
To operate with the greatest speed precision near the rated speed, select a motor with a rated voltage that is at
least 20 V below the Inverter’s input power supply voltage for 200 V class Inverters and 40 V below for 400 V
class Inverters. When the input voltage is the same as the rated voltage, the voltage limit may be applied and
vector control won’t be established.
6.2.1 Autotuning for general-purpose motors
CAUTION
D
Do not connect a load to the motor when performing autotuning.
Doing so may result in personal injury or equipment damage.
When motor cannot be disconnected from the load, motor constants can be setby calculation. Contact your
YASKAWA representatives for details.
J
Precautions before Autotuning
D
The Inverter’s autotuning function automatically determines the motor constants while a servo sys-
tem’s autotuning function determines the size of a load, so these autotuning functions are fundamental-
ly different.
D
If a load is connected when autotuning is performed, not only will incorrect motor constants be re-
corded, but the motor may operate erratically or unexpectedly. Disconnect the load before autotuning.
D
The motor shaft with rotate when autotuning is performed. Confirm safety before starting autotuning.
D
When motor cannot disconnected from the load, motor constants can be set by calculation. Contact
your YASKAWA representatives for details.
J
Inverter Input Voltage Setting: E1-01
D
Set the Inverter input voltage (E1-01) to match the power supply voltage.
User
Change
during
Setting
Factory
Valid Access Levels
User
Constant
Number
Name
during
Opera-
tion
Setting
Range
Unit
Factory
Setting
Open Loop
Vector
Flux Vector
E1-01
Input voltage setting
155 to 255
(310 to 510) VAC
200
(400)
Q
Q
D
The voltage settings shown in parentheses are the values for the 400 V class. This setting is used as
the reference value for functions such as the protection functions.
J
Motor Selection: E1--02
D
Set the type of motor being used. This setting is a reference for overheating protection functions.
User
Change
during
Setting
Factory
Valid Access Levels
User
Constant
Number
Name
during
Opera-
tion
Setting
Range
Unit
Factory
Setting
Open Loop
Vector
Flux Vector
E1-02
Motor Selection
(motor overheating
protection)
0 to 2
--
0
Q
Q
D
Settings
Setting
Function
0
Standard motor (general--pupose motor)
1
Special motor (inverter--exclusive motor)
2
Special motor (vector--exclusive motor)
6