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4.13 Online auto tuning (Pr. 95)
Excellent torque accuracy is provided by temperature compensation even if the secondary resistance value of
the motor varies with the rise in the motor temperature.
This function is effective or when stable, higher-torque operation is needed at low speed in vector control
without encoder.
4.13.1 Online auto tuning selection
(Pr. 95, Pr. 9, Pr. 71, Pr. 80, Pr. 81
Parameter
Name
Online auto tuning
95
selection
Electronic thermal
9
O/L relay
71
Applied motor
80
Motor capacity
81
Number of motor poles
(1) Pr. 95="1" (start time tuning)
This function is effective for optimum speed estimation and torque accuracy improvement when using the motor
without encoder.
The current at a start is detected to compensate for the secondary resistance of the motor so that excellent
characteristics are provided regardless of the change in value of the secondary resistance of the motor with the rise
of the motor temperature.
POINT
When exercising vector control without encoder, set "1" in Pr. 95 to perform start time tuning.
Perform offline auto tuning in the rotation mode before performing online auto tuning with start time tuning.
Data needs to be calculated.
CAUTION
1. For using start time tuning in vertical lift applications, examine the utilization of a brake sequence for
the brake opening timing at a start. Though the tuning ends in about a maximum of 500ms after a
start, torque is not provided fully during that period. Therefore, note that there may be a possibility of
gravity drop.
REMARKS
To prevent delay at starting, X28 function which executes tuning before start signal input is provided. (Refer to page 36.)
with
Encoder
Speed
Factory
Setting Range
Setting
0
0, 1, 2
Rated inverter
0 to 500A
output current
30
Refer to page 123 and make setting.
Inverter capacity
0.4 to 55kW
4
2, 4, 6
139
Online auto tuning (Pr. 95)
without
with
without
Condi-
tional PLC
Encoder
Encoder
Encoder
Torque
Position
Remarks
0: Online auto tuning not performed
1: Start time tuning (at start-up)
2: Adaptive magnetic flux observer (normal)
Used as rated motor current and electronic
thermal relay function parameters.
(Refer to page 93)
(Down to one rank lower of the inverter capacity)
SSC
)
4
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Troubleshooting
