5-146
5-11 Sensorless Vector Control
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-Axxxx)
5
Functions
Note 1: For moment of inertia J, set a conversion value for the motor. After setting the J value, adjust the
response speed in Speed Response (H005/H205). The larger the Speed Response (H005/H205),
the higher the response speed , resulting in a steep torque rise; the smaller the J value, the lower
the response speed, resulting in gradual torque rise.
Note 2: In sensorless vector control, an output in the direction opposite to the RUN command direction
may be issued in the control in the low-speed range, etc.
If the motor's reverse rotation may cause a problem, such as damage to the machine driven by
the motor, set Reverse Rotation Prevention Selection (b046) to "01: Enabled". (Refer to "Reverse
Rotation Prevention Function" on page 5-156.)
Note 3: Motor Cable Length Code Selection (b033) is a parameter for compensating the current detection
accuracy based on the difference in the motor cable length. This parameter need not be set for 11
kW and 15 kW models.
Offline Auto-Tuning Function
In offline auto-tuning, whether the "motor rotates or not" can be selected.
The features of each setting are described below.
H031/H231
Motor 1/2 Parameter R2
(auto-tuning data)
0.001 to 65.53
(Secondary resistance)
Depends on
the capacity
Ω
H032/H232
Motor 1/2 Parameter L
(auto-tuning data)
0.01 to 655.3
(Leakage inductance)
Depends on
the capacity
mH
H033/H233
Motor 1/2 Parameter Io
(auto-tuning data)
0.01 to 655.3
(No-load current)
Depends on
the capacity
A
H034/H234
Motor 1/2 Parameter J
(auto-tuning data)
0.001 to 9999.
(Moment of inertia)
Depends on
the capacity
kgm
2
Motor cable length
*3
b033
Motor Cable Length
Code Selection
5. to 20.
10. −
*1.These parameters are used to set motor parameters when auto-tuning is not used. The parameters of
a standard motor are set by default.
*2.These parameters are measured automatically when offline auto-tuning is performed. They can also
be changed to desired value manually after tuning.
*3.Set an appropriate value according to the motor cable length used.
Parameter
No.
Function name Data
Default
setting
Unit
Term Description
Offline Auto-Tuning The motor parameters required in sensorless vector control are
automatically measured in a dedicated operation pattern different
from that of normal operation, to increase the accuracy of vector
control.
Motor does not rotate The motor parameters are measured without rotating the motor. Use
this setting if motor rotation must be prevented. Since the motor does
not rotate, motor parameter Io (no-load current) and motor parameter
J (moment of inertia) cannot be measured. The previously set values
are held for motor parameter Io and motor parameter J.
Motor rotates The motor parameters are measured by actually rotating the motor.
Use this setting if motor rotation does not cause problems.
*
Related functions b046
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