GE Valve Software Tools MN-Valvue-FF-IOM Service Manual download pdf (Page 228)

ValVueFF Software Interface to FVP

212

GE Energy

Reference Model Process

The Heat Exchanger model, shown in Figure 174, is not a practical example but it does

incorporate elements that illustrate important ValVueFF features. Each module has a

device tag used for ValVueFF identification. The process consists of a vessel with a

product vapor inflow that is condensed and flows out as a liquid outflow. The tank level is

controlled by an outflow control valve, LV 201. The tank contents are chilled by coolant

water. The temperature is controlled by a temperature controller cascaded to a flow

controller. The coolant flow is controlled by control valve FV 101.

P& I D

Figure 175 shows, in schematic form, the physical devices and indicates the

measurement and control functions that reside in each device:

❑ The coolant flow transmitter, FT 102, has only a transmitter function.

❑ The coolant flow control valve, FV 101, has a PID control: two DI blocks and an

Analog Output Block (AO) all located within the FVP valve positioner.

❑ The flow of control information between devices is indicated by dashed lines.

❑ The DI blocks, ZSL 101 and ZSH 101, serve as low and high stem position limit

switches, respectively. The DI blocks, ZSL 201 and ZSH 201, serve as low and

high stem position limit switches, respectively.

❑ Liquid level is controlled by a remote controller LC201 to demonstrate Remote

Cascade operation.

❑ The controller receives the process measurement from level transmitter LT 202.

The PID control regulates the valve LV201, an FVP positioner with an Analog

Output Block, and 2 DI function blocks.

Figure 175 Piping and Instrumentation Diagram

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GE Valve Software Tools MN-Valvue-FF-IOM Service Manual Page 228