STAHL ET-436-AT-R2-HB-TX-100GB-V

Brand:STAHL

Type:ET-436-AT-R2-HB-TX-100GB-V

Origin: the United States

Warranty: 365 days

Colour: new/used

Shipping method: Courier delivery

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In this operating mode the turbine’s HP and LP valve actions are fully decoupled. The HP valve can be positioned by the 505E’s Speed, Cascade, or Auxiliary PIDs. The LP valve can only be positioned by the 505E’s Extr/Adm PID. The decoupled configuration allows control of a turbine’s inlet pressure without interaction from exhaust flow changes. With this mode of operation, turbine exhaust pressure is controlled by only moving the LP valve. The turbine’s HP and LP valve actions are also decoupled to control turbine exhaust pressure/flow without interaction from turbine inlet pressure or flow changes. Turbine inlet pressure is controlled by only moving the HP valve, thus no change in exhaust pressure/flow is created. For a change in either process the respective valves are repositioned for a net effect of no pressure or flow change on the other process. With this mode of operation, turbine inlet pressure can be controlled through either the 505E’s Auxiliary or Cascade PIDs and turbine exhaust pressure is controlled through the Ext/Adm PID. Although turbine load is not controlled with this configuration, it is recommended to use the Auxiliary PID as a load limiter for unit protection. Block Diagram Description The block diagrams displayed below provide a detailed view of each Ratio/Limiter configuration and the relationship between the ratio/limiter’s input and output signals. The ‘S’ input signal originates from the Speed/auxiliary LSS buss and represents Speed, Load, Aux PID, or Casc PID demand. The ‘P’ input signal originates from the Ext/Adm PID or the E/A demand setpoint, depending on selected modes, and represents Ext/Adm flow demand. The ‘DC’ input signal is a discrete signal that originates from the control’s decoupling map logic and goes to a true state when ratio/limiter decoupling is selected. The ‘S’ and ‘P’ signals must pass through map limiters, depending on the priority selected, before they are used in the ratioing equations. Only one parameter (S or P) at a time can be limited, thus if speed priority is enabled, only the P signal is limited. If Ext/ Adm priority is selected, only the S signal is limited. These limiters allow the valves to be correctly positioned on each turbine operating limit. To simplify the limiter logic, the Min (HSS bus) and Max (LSS bus) limiters are displayed as one limiter bus. Each possible turbine operating limit is labeled and displayed graphically.

 All Limiters are based on the entered steam map values and actual HP & LP valve positions (as derived from the control’s actuator driver signals). Once the ‘S’ and ‘P’ signals pass through their respective limiters, they are referred to as S’ (S-prime) and P’ (P-prime). When the turbine is not operating on a limit, the S’ value equals the S input signal and the P’ value equals the P input signal. If programmed for decoupled operation, digital ramps are used to transfer between Ratio/ Limiters. During normal enabling and disabling of the decoupled ratio/limiter mode, these ramps take 50 seconds to completely ramp from one ratio/limiter to the next. with generator applications, this transfer is made within 40 milliseconds when switching to frequency control (gen or tie breaker opens).