to the controller by the rectifier man1 a rectifier has been placed into a local manual standby mode whereby its output delivering capabilities have been turned off this is typically done by switching the rectifier into an off or standby mode bda1 the plant controller has determined that the plant voltage is below a defined or default threshold voltage this alarm indicates that the plant is in a battery on discharge mode the controller 200 employs an algorithm that prevents chattering from occurring by evaluating the variables that represent the states of various plant components the controller 200 verifies the states of the macf1 mfa1 man1 or bda1 alarm inputs the macf1 condition is asserted if either the ac input to the plant has been shut off or removed two or more ac input circuit breakers to each of the rectifiers had been tripped or the level of the ac input that powers two or more of the rectifiers are determined to be out of the desired operating range of the switching power supply in any case the rectifier redundancy of the plant has been jeopardized and the plant is being overloaded so the controller 200 does not allow the disconnected load to be reconnected to the bus even if the bus voltage appears to be at a sufficient voltage level mfa1 functions in a fashion similar macf1 detecting an mfa1 condition normally means that the plant controller has determined that two or more rectifiers have provided an indication that they have failed this failure was detected internally by the suspect.