Watlow Series 920 Microprocessor-Based Ramping Control Manual de usuario descargar pdf (Pagina 33)

Chapter

How to Tune the Series 920

This chapter will explain tuning the Series 920 to the system it controls.

Recommended Tuning Reference

There are a number of quality references on the art of tuning electronic control-

lers

to the systems they control.

If you are not an instrument technician

qualified to tune thermal systems, we suggest that you obtain and become

familiar with the reference below before attempting to tune your system.

Remember that the

time

you spend tuning your system is relative to the quality

of control you

need.

Process Control Instrumentation Technology

Third Edition

by Curtis D. Johnson

hard cover, 1982,497 pp.

ISBN:

0-471-05789-4 approx. $37.00

“Its overall objective is to provide instructional material for a general under-

standing of process control characteristics such as elements, modes, and

stability along with detailed knowledge of measurement technique, control

mode implementation, and final control element functions.” Johnson

Using A Chart Recorder

The tuning procedure will be greatly simplified if you use a chart recorder to

assist in tuning the Series 920. While the Series 920 itself will not drive a chart

recorder, there are several Watlow controls and indicators which will. Your

Watlow sales engineer or distributor can help you select one.

Place the chart

drive sensor near the Series 920 sensor so that the recorder is reading the

same system response.

If you don’t have a chart recorder available, you can still plot the time vs.

temperature system response. Record the 920’s ACTUAL display readings on

graph paper with an x, y

axis to

accomplish the same thing.

Load

LEDs

The °F/°C

LEDs

also function as load indicators. When tuning your control set

DIP Switch

to the ON position for load indication. The °F LED now

func-

tions as an LED for Load 1 and the °C LED functions as an LED for Load 2.

These

LEDs

help you

determine

when the system has stabilized by cycling at

a constant rate. When

used

in a heat/cool application, these

LEDs

help

determine the interaction between heating and cooling.

How To Tune The Series

920,

Chapter

WATLOW Series 920

User's

Manual

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