An explanation for unusual BRAHVO behaviour: When channels trip on a L4032 high voltage mainframe, instead of showing them as "red", BRAHVO reports the mainframe status "error" or "unknown" and show all channels of that mainframe in gray colour, whether they are good or bad. When this happens, look at all channels for a detector, find those that tripped (the actual voltages will be zero) and reset them. To reset the tripped voltages, manually set the demand voltage to zero, (both demand and actual voltages should become zero), then set it back to the "desired" voltage (both demand and actual voltages should become same as the desired voltage). After the last tripped channel is reset, the mainframe status should change to "on" and all channels should become "green". -- Konstantin Olchanski Physics Department, Brookhaven National Laboratory, Long Island, New York olchansk@bnl.gov
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