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SJ300 Inverter
Operations
and Monitoring
4–67
Auto-tuning of
Motor Constants
The SJ300 inverter features auto-tuning, which detects and records the motor characteristic
parameters to use in all vector control modes. Auto-tuning determines the resistance and induc-
tance of motor windings. Therefore, the motor must be connected to the inverter for this proce-
dure. Note that the auto-tuning feature is not associated with PID loop operation, which is
common on some control devices. The auto-tuning procedure must be conducted while the
inverter is stopped (not in Run mode), so it can use special output pulses to detect motor
characteristics.
When using the inverter in sensorless vector control, sensorless vector control - 0Hz domain, or
vector control with encoder feedback, the motor circuit constants are important. If they are
unknown, then you must first conduct the auto-tuning procedure. The inverter will determine
the constants and write new values for the related “H” Group settings. The auto-tuning proce-
dure requires that the inverter be configured to operate the 1st motor (do not set the inverter to
use 2nd and 3rd motor data during an auto-tuning procedure).
Please read the following Warning before running the auto-tuning procedure on the next page.
WARNING: You may need to disconnect the load from the motor before performing auto-
tuning. The inverter runs the motor forward and backward for several seconds without regard to
load movement limits.
Func. Name Range Notes
H001
Auto-tuning setting 00 Disabled
01 Enabled, without motor rotation
02 Enabled, with motor rotation
H002
Motor data selection, 1st motor 00 Standard motor parameters
01 Auto-tuning parameters
02 Adaptive tuning parameters
H003
Motor capacity, 1st motor 0.2 – 75,
0.2 – 160
kW, up to –550xxx models
kW, –750xxx to –1500xxx
models
H004 Motor poles setting, 1st motor 2 / 4 / 6 / 8 Units: poles
H030
Auto-tuned motor constant R1,
1st motor
— Units: ohms
H031
Auto-tuned motor constant R2,
1st motor
— Units: ohms
H032
Auto-tuned motor constant L,
1st motor
— Units: mH
H033
Auto-tuned motor constant Io,
1st motor
— Units: A
H034
Auto-tuned motor constant J, 1st
motor
—
Units: kgm
2
A003 Base frequency setting 30 to maximum freq. Units: Hz
A051
DC braking enable 00 Disabled (Disable during auto-
tuning)
01 Enabled
A082
AVR voltage select 200/215/220/230/240 Valid for 200V class inverters
380/400/415/440/
460/480
Valid for 400V class inverters