User Manual EM303B General Purpose Inverter 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. 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 162 I1 U1 I0 I2 Lm