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Programmable Safety Systems for Burner Management on ... - ICEWeb

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The Turbine is now run up to its operati<strong>on</strong>al speed with a modulating gas valve beingc<strong>on</strong>trolled by the standard PLC c<strong>on</strong>trol system. The <str<strong>on</strong>g>Safety</str<strong>on</strong>g> system is now m<strong>on</strong>itoring<str<strong>on</strong>g>for</str<strong>on</strong>g> loss of flame known as Flame Out and other c<strong>on</strong>tinuous c<strong>on</strong>diti<strong>on</strong>s which will bedescribed in the following secti<strong>on</strong>s.In the described applicati<strong>on</strong> two turbines (A and B) are c<strong>on</strong>nected at each end of theGenerator in what is called a “Twin Pack” arrangement. Air Coupling from theTurbine to the Generator allows the turbines to operate singly at half power ortogether. Each turbine is capable of producing 25MW, there<str<strong>on</strong>g>for</str<strong>on</strong>g>e a 50MW capacity isavailable from each Generator set.<str<strong>on</strong>g>Safety</str<strong>on</strong>g> System Descripti<strong>on</strong>:A Pilz <str<strong>on</strong>g>Programmable</str<strong>on</strong>g> <str<strong>on</strong>g>Safety</str<strong>on</strong>g> System (PSS) was chosen as the supervisory safety PLCas it provided the technical requirements, was cost effective and is approved <str<strong>on</strong>g>for</str<strong>on</strong>g> useby TUV as specified by AS3814-2002/AG501. A 5 Slot PSS 3100 rack was used <strong>on</strong>each of the 6 turbines. Each PSS3100 was c<strong>on</strong>figured with 48 Digital Inputs, 16Digital Outputs, 12 Relay Outputs, 6 x 4-20 mA analogue inputs and 6 x –10 to +10Vanalogue inputs.Fig.1 Gas Valve Layout

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