User Manual
EM303B General Purpose Inverter
162
9
Autotuning Motor Parameters
9.1
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, parameter 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 Lm, stator and rotor leakage inductance Ls, idling excitation current I0. EM303B
provides function of motor parameter autotuning. After the function start-up, inverter
autotunes the relevant parameters of the motor connected and saves them to the 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. Leakage inductance Ls=L-Lm.
9.2
Precautions Before Autotuning
Autotuning is a process of autotuning motor parameters. EM303B can autotune motor
parameters in 2 modes: stationary autotuning 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 normally.
Autotuning is only enabled when the inverter is in keypad control mode. (F0-04=0)
To ensure a smooth autotuning, set all motor parameters as per the values listed on
motor nameplate correctly:
F1-00: Motor model
F1-01: Motor rated power