Method for operating a public address system

摘要

The invention relates to a method for operating a public address system with a control center to which loudspeakers are connected via a two-wire loop system that is routed via isolator modules. A fault can be located on the loop system if the control center measures the impedance of the loop system successively from isolator module to isolator module and the impedance of the entire loop system, inputs the measured values as target values into an impedance table, periodically measures the impedance of the entire loop system during operation, compares said impedance with the corresponding target value from the impedance table, generates a fault message upon determining a deviation, ascertains the fault location by comparing the measured value with the individual target values in the impedance table, and displays said fault location.

主权项

1. A method of operating a public address system having a plurality of loudspeakers, the method comprising:
providing control circuitry; coupling each of the plurality of loudspeakers to the control circuitry via a two-wire loop that includes isolator modules; determining values of an impedance of the two-wire loop successively from isolator module to isolator module by successively connecting each respective isolator module of the plurality of loudspeakers to the two-wire loop proceeding from a start to an end of the two-wire loop while repeating an impedance measurement from the start of the two-wire loop after each successive connection; determining a value of an impedance of the entire two-wire loop; storing at least some of the determined values of the impedance of the two-wire loop successively from isolator module to isolator module and the determined value of the impedance of the entire two-wire loop as target values; intermittently determining the value of the impedance of the entire two-wire loop during operation; and determining if a variance exists between the determined value of the impedance of the entire two-wire loop during operation and the stored target values, and, responsive thereto, generating a fault message including a fault location.