| 摘要 |
PURPOSE:To allow a maintenance personnel to know contents of a fault at the location and to simplify the constitution by selecting a priority circuit by a selection means at occurrence of the fault, driving a fault informing device via the priority circuit and transmitting the fault by voice. CONSTITUTION:If a power supply fault takes place in a power supply 41 mounted on an exchange 40,an earthing signal is generated from the power supply 41, a current flows in a route of earth-PWAL contact-contact 3Ab-power fault supervisory relay-2A-48V power supply BB1, and the power supply fault supervisory relay 2A is actuated. Then the power supply fault supervisory 1A is operated by closing the relay contact 2Aa. The operation of the relay 1A switches the contact 1Ab and a fault forming device 2AB is controlled by the route of earth-relay contact 1Ab(make)-relay contact 2Ac(make)-fault informing device 2AB of power supply. Then the content 'Power supply fault' stored in voice in advance is broadcast from a speaker 54. |
