Brand:NI

Type:SBRIO-9607

Origin: the United States

Warranty: 365 days

Colour: new/used

Shipping method: Courier delivery

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Communications Grounding and Shielding All three 505E communications ports are fully isolated from earth ground. The RS-422 and RS-485 specifications state that a ground wire is needed if there is no other ground path between units. The preferred method to do this for isolated ports is to include a separate wire in the ground cable that connects the circuit grounds together. Connect the shield to earth ground in at least one location, see Figure 2-13a. Non-isolated nodes may not have a signal ground available. If signal ground is not available, use the alternate wiring scheme as shown in Figure 2-13b. The alternate way is to connect all circuit grounds of isolated nodes to the shield, and then connect the shield to earth ground at a non-isolated node.

The 505E may be programmed to operate single extraction, single admission or single extraction/admission turbines. For each of these turbine applications, the 505E’s Ratio/ Limiter may be configured to have the turbine’s HP and LP valves interact differently depending on the turbine’s function within a system.

Ratio/Limiter Configurations The 505E Ratio/Limiter receives two input signals. One input signal is from the Speed and Auxiliary PIDs’ LSS bus. The second input signal is from a software switch which selects between a Demand setpoint (used for Adm or Extr/Adm applications only) and the Extr/Adm PID. The ratio logic uses these two input signals to produce two output signals, one to control the HP actuator and one to control the LP actuator. The limiter logic keeps the turbine control valves’ outputs within the boundaries of the turbine steam map. 505E Digital Governor Manual 85018V1 42 Woodward The ratio logic controls the interaction of both HP and LP valves to maintain desired turbine speed/load (or Auxiliary or Cascade PID processes) and extraction/admission pressure/flow levels. By controlling valve interaction, the ratio logic minimizes the effects of one controlled process on the other controlled process. When system conditions cause a turbine to reach an operating limit, the limiter logic limits the HP or LP valves to maintain speed/load or extraction/admission levels depending on the priority selected.