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The function of Fuzzy Logic is to adjust the PID parameters internally in
order to make the manipulation output value MV more flexible and adaptive
to various processes.

The Fuzzy Rule may like these:

If temperature difference is large, and temperature rate is large, then
MV is large.
If temperature difference is large, and temperature rate is small, then
MV is small.
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PID + Fuzzy Control has been proven to be an efficient method to improve
the control stability as shown by the comparison curves below:

CONTENTS

1. INTRODUCTION

5. OPERATION

2. NUMBERING SYSTEM

6. RE-CALIBRATION

3. SPECIFICATIONS

7. ERROR MESSAGE & DIAGNOSIS

4. INSTALLATION

8. COMMON FAILURE CAUSES

1. INTRODUCTION

The FDC-9200 Fuzzy Logic plus PID microprocessor controller,
incorporates a bright, easy to read 4-digit LED display, indicating process
value. The Fuzzy Logic technology enables a process to reach a
predetermined setpoint in the shortest time, with the minimum of overshoot
during power-up or external load disturbance. The units are housed in a
1/16 DIN case, measuring 48 mm x 48 mm with 75 mm behind panel depth.
The units features three touch keys to select the various control and input
parameters. Using a unique command called " CONFIGURE LEVEL ", a
supervisor has the flexibility of determining which parameters are accessible
by the user. Also the scrolling sequence of parameters are fully configurable
according to your requirement. This is particularly useful to OEM's, as it is
easy to limit access to suit the specific application.

The FDC-9200 is powered by 20-32 or 90-264VAC supply, incorporating a
3 amp. control relay output and dual 3 amp. alarm relays output as standard
which second alarm can be exceptionally configured into second output
for cooling purpose or dwell timer. Alternative output options include SSR
drive, 4-20mA and 0-10 volts. The FDC-9200 is fully programmable for
PT100, thermocouple types K, J, T, E, B, R, S, N, 0-20mA, 4-20mA and
voltage signal input, with no need to modify the unit.

Digital communications RS-485 or 4-20mA retransmission are available as
an additional option. These options allow the FDC-9200 to be integrated
with supervisory control systems and software, or alternatively drive
remote display, chart recorders or data-loggers.

In last nearly a hundred years although PID control has been used and
proved to be an efficient controlling method by many industries, yet the PID
is difficult to deal with some sophisticated systems such as second order
systems, long time-lag systems, during setpoint change and / or load
disturbance circumstance etc. The PID principle is based on a mathematic
modeling which is obtained by tuning the process. Unfortunately, many
systems are too complex to describe in numerical terms precisely. In
addition, these systems may be variable from time to time. In order to
overcome the imperfection of PID control, the Fuzzy Technology is
introduced. What is the Fuzzy Control ? It looks like a good driver. Under
different speeds and circumstances, he can control a car well with
experiences he had before and does not require the knowledge of kinetic
theory of motion. The Fuzzy Logic is a linguistic control which is different
from the numerical PID control. It controls the system by experiences and
does not need to simulate the system precisely as been controlled by PID.

The basic theory used in this controller is described in the following block
diagrams:

Safety Symbol

The symbol calls attention to an operating procedure, practice, or the like,
which, if not correctly performed or adhered to, could result in personal
injury or damage to or destruction of part or all of the product. do not
proceed beyond a safety symbol until the indicated conditions are fully
understood and met.

Model: FDC-9200
Instruction Manual

Fuzzy Rule

Fuzzy Inference

Engine

Defuzzifier

Fuzzifier

Numerical

information

Linguistic

information

Numerical

information