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Loss of excitation may be simulated by forcing Efd to 0 by changing field voltage maximum and minimum voltage with API changeplmodcon:

psspy.change_plmod_con(211,'1','SCRX',5,0.0)
psspy.change_plmod_con(211,'1','SCRX',6,0.0)

In this simulation EFD is set to zero at time=1 s.