User Manual of EM760 High-Performance Inverter F06.17=2 : the inverter freely stop running with its output blocked. In the vector control mode, voltage feedforward adjustment is added to automatically increase the torque, i.e. the compensation for stator voltage drop. Flux weakening control options: F06.21=0: invalid Flux weakening control is not performed. The maximum speed ofthe motor is related to the bus voltage of the inverter. When the maximum speed of the motor does not meet user requirements, the flux weakening function of the synchronous motor should be enabled to increase the speed. EM760 has two flux weakening modes: direct calculation and automatic adjustment. F06.21=1:
direct calculation In the direct calculation mode, the flux weakening current is calculated according to the target speed and can be adjusted manually via the option 06.22. The lower the flux weakening current, the lower the total output current will be, but the desired effect of flux weakening may not be achieved. F06.21=2: automatic adjustment In the automatic adjustment, the optimal flux weakening current will be selected automatically, but it may affect the dynamic performance of the system or become unstable. The speed of flux weakening current adjustment can be changed by setting the proportional gain (F06.24) and integral time (F06.25).
However, fast adjustment of the flux weakening current adjustment may cause instability. This does not need to be changed manually under normal circumstances. 7.1.3 Asynchronous motor FVC control The difference of FVC control compared to SVC control is the addition of encoder speed detection. Steps of commissioning: (1) Select corresponding PG card according to the encoder. (2) Connect the encoder to the PG card. (3) Set rated motor parameters F01.00 - F01.06 as per motor nameplate. Specify encoder type F01.24 and number of encoder wires F01.25 as per encoder nameplate. If rotary transformation is used, you need to set the pole pairs F01.30 of rotary transformer as well.
209 Function code Function codename Parameter description Unit Default setting Attribute F06.20 Voltage feedforward gain 0~100 % 0 ● Function code Function codename Parameter description Unit Default setting Attribute F06.21 Flux weakening control options 0: Invalid 1: direct calculation 2: automatic adjustment 1 O F06.22 Flux weakening voltage 70.00~100.00 % 100.00 ● F06.24 Proportional gain of flux weakening regulator 0.00~10.00 0.50 ● F06.25 Integral time of flux weakening regulator 0.01~60.00 s 2.00 ●