National-instruments FP-3000 Manual de usuario descargar pdf (Pagina 42)

Chapter 3 Example Applications

Example 2: Temperature Control with the FP-3000

One common application of the FP-3000 is controlling temperature.

A temperature control application might include a heating element and a

temperature sensor and require temperature to be maintained at a constant

level, plus or minus some tolerance. Such an application would be well

suited for PID control. In this example, the thermocouple measures the

temperature in an enclosure, a PID block performs control, and the current

output from an FP-AO-200 heats the heating element.

If you want to know how to get a thermocouple reading but are not

interested in closed-loop PID control, perform only the steps in the section

Taking Temperature Readings. After you complete those steps, the

FP-3000 takes temperature readings. If you want to know how to output

current to a simple device (like a resistive heating element) but are not

interested in closed-loop PID control, proceed to the section Controlling a

Heating Element, and perform the steps there. After you complete those

steps, the FP-3000 controls output current.

Getting Started

Example 2 requires the following materials:

• Thermocouple or RTD input module (FP-TC-120 or FP-RTD-122)

installed in a terminal base

• FP-3000 network module

• Analog output (AO) module installed in terminal base, such as the

FP-AO-200 or FP-PWM-520 (this example uses the FP-AO-200)

Wire the thermocouple to channel zero of the FP-TC-120 module, paying

attention to the polarity of the thermocouple wires. Next, wire the heating

element (a small light bulb or even a resistor will work) to channel zero of

the FP-AO-200 module. To determine which terminals to use for channel

zero, refer to the wiring diagram in the Operating Instructions that came

with your modules.

You also need to connect a power supply to the V and C terminals of the

FP-AO-200 module to source power on the output channel. Refer to the

FP-AO-200 operating instructions and Supplying Power for Outputs in

Chapter 2, Installation and Configuration, for more information.

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 154 155

Sin comentarios

National-instruments FP-3000 Manual de usuario Pagina 42