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5-20
5-2 Open-loop Vector Control
Open-loop
vector control is vector control without
pulse generator input. Auto-tuning is
the only setting for basic operation with open-loop vector control.
When the voltage limit restricted by the input power supply is reached near the rated
motor
speed, vector control cannot be established and speed accuracy will be reduced.
T
o operate with the greatest speed precision near the rated speed, either select a motor
with
a rated voltage that is at least 20 V
below the Inverter
’
s input power supply voltage
(40
V
below for a 400-V class Inverter) and use a special vector control motor is possible,
or
set an output voltage restriction in parameter C3-06 (see
6-1-5 Operation for Output
Voltage
Saturation
for details). (If an output voltage restriction is set in C3-06, the Invert
-
er’
s output current will be reduced by about 10%, so be sure to use an
Inverter with suf
fi-
cient capacity.)
5-2-1 Auto-tuning Procedure
H Inverter Input Voltage Setting (E1-01)
Set
the Inverter
’
s input voltage (E1-01) to match the power
supply voltage; it cannot be changed during
operation. This setting is used as the reference value for functions such as the protection functions.
Parameter Display Setting Units Default
Valid access levels
number
range setting
V/f
Control
V/f with
PG
Open Loop
Vector
Flux
Vector
E1-01 Input Voltage 155 to 255
(310 to 510)
VAC 200
(400)
Quick-start, Basic, or Advanced
Note The voltage settings shown in parentheses are the values for the 400-V class.
H Motor Selection (E1-02)
Set
the motor selection (E1-02) to the type of motor to be used. This setting is used as a basis for motor
protection
Parameter Display Setting Units Default
Valid access levels
number
range setting
V/f
Control
V/f with
PG
Open Loop
Vector
Flux
Vector
E1-02 Motor Selec-
tion
0 to 2 --- 0 Quick-start
D Setting
Setting Function
0 Standard fan-cooled motor (general-purpose motor)
1 Standard blower motor (inverter-exclusive motor)
2 Special motor (special vector control motor)
H Precautions Before Auto-tuning
Caution Do
not connect a load to the motor when performing auto-tuning. Doing so may re
-
sult in personal injury or equipment damage.
Basic Operation Chapter
5
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