在 IP 引脚电压从 VREF 降低至 VREF / 2 期间，在阶段（a）转子在直流励磁模式下对准某一指定的位置。
The rotor is aligned to a certain position specified in DC excitation mode for the period of (a), during which the IP pin voltage decreases from VREF to VREF/2 level.
对同步电机启动、加速、励磁模式切换等工作过程中变频器的应用进行了论述，介绍了电网改造的经济方案，提出了变频器在使用时的注意事项，达到既要节能又要省费用的电网改造效。
Based upon discuss of the application of frequency-converter in the start, acceleration, exciting model transform and other processes the economic reconstruction plan is introduced for power network.
直流励磁和强制 换向模式的占空比根据引脚 SC 的电压确定。
The duty cycles for DC excitation and forced commutation modes are determined according to the SC pin voltage.
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