Auto-Tuning Of Motor Constants - Hitachi SJ300 Series Instruction Manual

Auto-tuning of
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-
Motor Constants
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
Auto-tuning setting
H001
Motor data selection, 1st motor
H002
Motor capacity, 1st motor
H003
H004 Motor poles setting, 1st motor
Auto-tuned motor constant R1,
H030
1st motor
Auto-tuned motor constant R2,
H031
1st motor
Auto-tuned motor constant L,
H032
1st motor
Auto-tuned motor constant Io,
H033
1st motor
Auto-tuned motor constant J, 1st
H034
motor
A003 Base frequency setting
DC braking enable
A051
AVR voltage select
A082
Range
00 Disabled
01 Enabled, without motor rotation
02 Enabled, with motor rotation
00 Standard motor parameters
01 Auto-tuning parameters
02 Adaptive tuning parameters
0.2 – 75, kW, up to –550xxx models
0.2 – 160 kW, –750xxx to –1500xxx
models
2 / 4 / 6 / 8 Units: poles
— Units: ohms
— Units: ohms
— Units: mH
— Units: A
—
Units: kgm
30 to maximum freq. Units: Hz
00 Disabled (Disable during auto-
tuning)
01 Enabled
200/215/220/230/240 Valid for 200V class inverters
380/400/415/440/ Valid for 400V class inverters
460/480
4–67
SJ300 Inverter
Notes
2