Hitachi WJ200-001S Instruction Manual page 442

•When using this function, observe the following precautions:
① In combination with the motor other than Hitachi standard motor, performance cannot be guaranteed to be
sufficient.
② If you cannot obtain the desired characteristics from the motor driven under the sensorless vector control,
readjust the motor constants according to the symptom, as described in the table below
Operation
status
Trouble is caused
when reverse run.
Starting Generate out-of-step.
Generate over current
trip.
Need for early
starting.
Motor runs unsteadily.
Less than
H121 (PM
minimum
Motor generate
frequency)
hunting.
setting
Near H121
Motor generates an
(PM
impact.
minimum
Generate over current
frequency)
trip.
setting
More than
H121(PM
Motor generate
minimum
hunting.
frequency)
setting
Symptom
Enable to the initial magnet position estimation
function.
- The motor may rotate slightly, but this is not
abnormal behavior.
Increase the starting current.
- Note the electronic thermal protection function.
Increase the starting time.
Enable to the initial magnet position estimation
function, and reduce the starting time.
Increase the starting current
- Note the electronic thermal protection function.
Reduce the motor constant R step by step from the set
value down to 0.7 times as high as the set value.
Increase the motor constant Ld step by step from the
set value up to 1.3 times as high as the set value.
Increase the motor constant Lq step by step from the
set value up to 1.3 times as high as the set value.
- Please adjust to Ld ≦ Lq.
Adjust the speed response.
Adjust the minimum frequency when a load changes.
Adjust the speed response.
Increase the no-load current.
Increase the carrier frequency current if low setting.
Adjustment method
Ver.213
Adjustme
nt item
H123
H117
H118
H118,H12
3
H117
H106,H11
1
H107,H11
2
H108,H11
3
H116
H121
H116
H122
b083