Example2: temperature control with the fp-3000, Getting started, Example 2: temperature control with the fp-3000 -7 – National Instruments FP-3000 User Manual
Page 42: Getting started -7
Chapter 3
Example Applications
© National Instruments Corporation
3-7
FieldPoint FP-3000 User Manual
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
. 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
, 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
in
Chapter 2,
Installation and Configuration
, for more information.