open circuit motor field-check connection and measure field resistance.faulty operation of field controller.where an ac supply feeds the onboard field regulator ,check connections D1 and D2 for line-to-line voltage (rather than line-to-neural)-L1 into D1,L2 into D2,note that the 3-phase supply must be present for mains synchronisation purposes.for loads where no field supply is required ,e.g. a permanent magnet motor ,set the FIELD ENABLE parameter to disable to suspend this alarm.