The vascular graft includes a conduit structure having outer and inner wall surfaces. The method is characterized in that the fluidized bed catalyst is a catalyst containing iron, antimony, and tellurium, and the vapor phase catalytic ammoxidation process is performed while maintaining an adsorbed amount of ammonia per specific surface area of the fluidized bed catalyst in the range of 0. A plurality of power output feeds is retained by the enclosure for coupling to the plurality of electrical loads. If the timer finishes counting down while the fault is still present, then it is determined if any of the other two phases are timing a fault.