Online Auto Tuning - Mitsubishi Electric FR-V500 Series Instruction Manual

Online auto tuning

4.6 Online auto tuning
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.
4.6.1 Parameters
• For the motor with encoder, set "2" in Pr. 95 "online auto tuning selection".
Parameter Name
95 Online auto tuning selection
4.6.2 Pr. 95 = "1" (start time tuning)
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.
CAUTION
1. Perform offline auto tuning in the rotation mode before performing online auto tuning with start time
tuning. Data needs to be calculated. Refer to the Instruction Manual (detailed) for offline auto tuning.
2. 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 provides tuning before start signal input is available. (Refer to the Instruction
Manual (detailed).)
4.6.3 Pr. 95 = "2" (normal tuning)/adaptive magnetic flux observer
This function is effective for optimum speed estimation and torque accuracy improvement when using the motor
with encoder.
The current flowing in the motor and the inverter output voltage are used to estimate/observe the magnetic flux in
the motor.
The magnetic flux of the motor is always detected with high accuracy so that excellent characteristics are provided
regardless of the change in the temperature of the secondary resistance.
Set "2" when exercising vector control with encoder.
CAUTION
1. For the SF-V5RU, SF-JR (with encoder) or SF-HRCA (with encoder), it is not necessary to perform
offline auto tuning to select adaptive magnetic flux observer. (Note that it is necessary to perform
offline auto tuning (non-rotation mode) for the wiring length resistance to be reflected on the control
when the wiring length is long (30m or longer as reference).)
For offline auto tuning, refer to the Instruction Manual (detailed).
REMARKS
1. Online auto tuning of the start time tuning does not operate if the MRS is input, if the preset speed is less than the starting
speed (Pr. 13), or if the starting conditions of the inverter are not satisfied, e.g. inverter error.
2. Online auto tuning of the start time tuning does not operate during deceleration or at a restart during DC brake operation.
3. Invalid for jog operation.
4. The RUN signal is not output during online auto tuning of the start time tuning. The RUN signal turns on at a start.
5. If the period from an inverter stop to a restart is within 4s, online auto tuning of the start time tuning is performed but the
tuning results are not reflected.
6. Automatic restart after instantaneous power failure overrides when automatic restart after instantaneous power failure is
selected.
7. Zero current detection and output current detection are valid during online auto tuning.
Factory Setting Setting Range
0 0, 1, 2
50
Remarks
0: No online auto tuning
1: Start time tuning (at start-up)
2: Adaptive magnetic flux observer (normal)