布朗e15系统超速保护说明.docVIP

Example of a typical E15 System CharacteristicsSafe overspeed alarm (SP1) with 2of3 voting (twice), one additional speed alarm signal (SP2) with own 2of3 voter. Safe analog output after 1of3 high level voting. Further Reverse alarm, free Pulse Outputs repeating the sensor signal, Sensor monitor in each channel, Test function control with failure alarms. Function Non-contact sensors A, B, C at the turbine shaft detect the speed, transmitting a corresponding pulse frequency to the inputs of the E15 electronics. Its input sections (E1518) make it available, from each channel, to the periphery for other use. Isolated, without reaction to the system, and not affected by the test procedure. For instance, to a governor system, or to a remote digital speed indicator. Further, the input modules permanently monitor the sensor circuit, and check for synchronism to the neighbor channels. Failures are signalized. The speed monitoring function continues, now with increased intensity 1of2 .Monitors E1555: the central section within each channel: These modules include measurement, alarm triggering, and conversion to analog. Two setpoint alarms are provided, SP1 and SP2, on every E1555. Both individually programmable in all aspects as setpoint level, hysteresis, starting and failure condition. Both setpoint signals address one each input of the voter module E1564. For safety reasons, two each E1564 voters are assigned to the overspeed signal SP1 (thus providing two separate shut-down paths). One voter module serves the SP2 alarm.Each of the E1555 modules further provides an analog signal. All of the three enter one voter E1565. This module selects the highest one of its input signals to transmit it to the periphery – mostly a speed governor. This again regards the safety aspect.Applications with own external voting system, will be served by an E15 version, which provides the three original signals separately from each channel.The independent test section includes the test gen