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Brand:NI
Type:GPIB-140A 186135F-31
Origin: the United States
Warranty: 365 days
Colour: new/used
Shipping method: Courier delivery
Module of PLC, DCS, ESD system card, the card is a vibration monitoring system, steam turbine control system module, the advantages of the gas generator spare parts brand: Allen Bradley, BentlyNevada, ABB, Emerson Ovation, Honeywell DCS, Rockwell ICS Triplex, FOXBORO, Schneider PLC, GE Fanuc, Motorola, HIMA, TRICONEX, Prosoft etc. Various kinds of imported industrial parts
Our main products are widely used in metallurgy, petroleum, glass, aluminum manufacturing, petrochemical industry, coal mine, papermaking, printing, textile printing and dyeing, mechanical, electronic manufacturing, automobile manufacturing, plastic machinery, electric power, water conservancy, water treatment/environmental protection, boiler heating, energy, power transmission and distribution and so on.
Because a single extraction and/or admission turbine has only two control valves, only two parameters at a time can be controlled. Due to a turbine’s design, the positioning of either valve (HP or LP) has an effect on both parameters being controlled. This interaction between valves (controlled parameters), can cause undesirable fluctuations in a process not requiring a change. When correcting for a system demand change in one process, it may be desirable to have the control move both turbine valves at the same time in order to reduce or stop the interaction of one process on the other. For this reason the 505E’s Ratio/Limiter can be configured in the following operational modes depending on the parameters being controlled and the turbine’s function within the system. Ratio/Limiter Configurations: • Coupled HP & LP • Decoupled INLET • Decoupled EXHAUST • Decoupled HP & LP Coupled HP & LP This mode is typically used when the two controlled parameters during normal operation are turbine speed/load and extr/adm pressure(or flow). In this operating mode, the turbine’s HP and LP valve actions are coupled (ratioed) together to control both processes without the two processes interacting with each other.
Turbine load and extr/adm pressure are controlled by moving both the HP and LP valves simultaneously. For a change in either process both valves are repositioned to create a net effect of no change (pressure, flow, or power) on the other process. In most cases, the operator of an extr/adm turbine needs to maintain both turbine speed/ load and extr/adm pressure/flow at constant levels. Changing the position of either the HP valve or the LP valve affects both turbine speed/load and extr/adm. If either the load on the turbine or the extr/adm demand changes, both the HP valve position and the LP valve position must be changed to maintain speed/load and extr/adm. The movement of both valves is automatically calculated by the 505E’s ratioing logic based on the programmed turbine performance parameters to minimize valve/process interaction. To select the “COUPLED HP & LP” control action configure the program’s “Decoupling?” setting to “No”. Manual 850
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