EM330D User Manual
A Special Purpose Inverter for Hoisting
89
8 Autotuning Motor Parameters
8.1
Autotuning Motor Parameters
Autotuning motor parameter is required when the inverter is in vector control mode.
However, if the inverter is not in vector control mode, autotuning is also suggested for
acquiring higher control precision at initial operation.
Generally, it is not easy for user to obtain the motor parameters that are needed for
calculation in vector control mode such as stator resistance R1, rotor resistance R2, stator
and rotor inductance L, stator and rotor leakage inductance Ls, idling excitation current.
EM330D provides autotuning function. After the function start-up, inverter automatically
tests the relevant parameters of connected motor and saves them to EEPROM.
The T equivalent model of motor is as shown in Figure 8-1.
U1
I1
I2
I0
Lm
R1
L1-Lm
R2
L2-Lm
(1-s)/s*R2
Figure 8-1 T Equivalent Model of 3-phase AC Induction Motor
R1, L1, R2, L2, Lm, and I0 in Figure 8-1 refers to stator resistance, stator inductance, rotor
resistance, rotor inductance, stator and rotor mutual inductance, and idling excitation
current respectively.
8.2
Precautions Before Autotuning
Autotuning is a process of autotuning motor parameters. EM330D can autotune
motor parameters in 2 modes: stationary autotuning and rotational and rotational
autotuning.
Stationary autotuning is applied to the occasions when the motor cannot be
disconnected from the load, inverter can obtain motor parameters.
Rotational autotuning is applied to the occasions when the motor can be
disconnected from the load. Before autotuning, the motor should be
disconnected from the load. Never perform rotational autotuning for a motor
with load.
Make sure that the motor stops before autotuning, otherwise, autotuning cannot be
performed.
Autotuning is only enabled when the inverter is in keypad control mode.
(F0-04=0)
If overcurrent or overvoltage trips in the process of autotuning,
acceleration/deceleration time 1 can be adjusted (F0-09 and F0-10) appropriately.
