Anderson LD Series Buku Petunjuk - Halaman 15

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2.8 CONTROLLER TUNING

As depicted in Figure 2-1, the typical application utilizes the signal from the transmitter to

interface with a programmable controller. In turn, this unit typically sends an output that is used

to throttle a feed valve. For actual P (Proportional), I (Integral) and D (Derivative) tuning informa-

tion, please consult the instruction manual provided with the controller. Some general control-

ler setup guidelines are as follows:

" WC = (Inches height X specific gravity of product)

The transmitter is calibrated in " WC. If the vessel is less than 30" WC height, the

default calibration for the transmitter remains at 30" WC. Be sure to set the

controller accordingly.

Be sure that either the controller is capable of providing proper loop power, or that

an external supply is utiized. Refer to the controller instruction manual for guide-

lines on proper wiring of an internal supply. Utilize Figure 2-3 as a reference to be

sure that all loop polarities are wired correctly.

On a typical controller, the following are the basic requirements to perform initial

startup. Again, refer to the actual manual for detailed instructions.

a. Specify a 4-20 mA input type to match the output of the transmitter.

b. Be sure any configuration switches internal to the controller are properly set.

c. Be sure wiring of loop/power source is correct.

d. Enter a "Lower" and "Upper" operating limit - typically 0 - 100%.

AGE