Hitachi WJ200-001S Instruction Manual page 437

Ver.28
14.1.5 PM offline auto-tuning function
PM offline auto-tuning automatically measures motor constants necessary for sensorless vector control at
special driving pattern different from usually besides driving, and accuracy of vector control is improved. PM
induction voltage constant Ke and PM moment of inertia J cannot measure because motor don't revolute. Please
set the induction voltage constant is the peak voltage of one phase of per electrical angle speed (rad/s), and the
moment of inertia is value (
moment of inertia into the motor shaft data to the moment of inertia of the motor, by manual.
■When using this mode, observe the following precautions.
① When you use vector control by the motor that doesn't understand constants, please measure motor
constants by offline auto-tuning.
② The measured motor constant is the data of one phase of Y connection.
③ Please use auto-tuning with the motor has stopped. If the motor rotates, correct constant data may not be
obtained. (In such cases, the auto-tuning operation may not be completed. If the auto-tuning operation is not
completed, press the STOP/RESET key. The operation will end with an error code displayed.)
④ Adjust the settings of base frequency (A003), maximum frequency (A004), AVR voltage select (A082), PM
motor capacity (H103), PM motor pole setting (H104) and PM Rated Current (H105) to the motor
specifications before use auto-tuning. When motor of outside set range of these parameters, correct constant
data may not be obtained. (In such cases, the auto-tuning operation may not be completed. If the auto-tuning
operation is not completed, press the STOP/RESET key. The operation will end with an error code
displayed.)
⑤ This function can properly apply to only the motors in the maximum applicable capacity class of your
inverter or one class lower than the capacity class of your inverter. If this function is used for motors with
other capacities, correct constant data may not be obtained. (In such cases, the auto-tuning operation may
not be completed. If the auto-tuning operation is not completed, press the STOP/RESET key. The operation
will end with an error code displayed.)
⑥ Specify "00" (disabling) for the DC braking enable. (The default setting is "00".) If "01" (enabling) is specified
for the DC braking enable (A051), motor constants cannot be measured by offline auto-tuning.
⑦ When the motor cable for the long (more than 20m as reference) distance, correct constant data may not be
obtained. Please set the motor cable length parameter (b033) according to the motor cable, and use
auto-tuning. (The motor cable length parameter setting is a parameter that corrects the current detection
accuracy by the difference of the length of the motor cable. The capacity of inverter of 11kW and 15kW need
not be set.)
⑧ The motor may rotate slightly during auto-tuning, but this is not abnormal behavior.
⑨ The allophone and the vibration may generate during auto-tuning, but this is not abnormal behavior.
⑩ Please do not use auto-turning with the shaft of the motor fixed with external brake etc. Otherwise correct
motor constants may not be obtained.
⑪ Please use auto-turning with the load machine attached to the motor. Otherwise right motor constants may
not be obtained.
) that added the moment of inertia of the load machine that converting the
kgm
2