Tempco TEC-9300, Instruction Manual

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1
Chapter 1 Overview
1–1 Features
** High accuracy 18-bit input
A–D
** High accuracy 15-bit out-
put D–A
** Fast input sample rate (5
times/second)
** Two function complexity
levels
** User menu configurable
** Pump control
* Fuzzy plus PID micro-
processor-based control
* Automatic programming
* Differential control
* Auto-tune function
* Self-tune function
* Sleep mode function
* “Soft-start” ramp and dwell
timer
* Programmable inputs (ther-
mocouple, RTD, mA, VDC)
* Analog input for remote set
point and CT
* Event input for changing
function and set point
* Programmable digital filter
* Hardware lockout and
remote lockout protection
* Loop break alarm
* Heater break alarm
* Sensor break alarm and
bumpless transfer
* RS-485, RS-232 communi-
cation
* Analog retransmission
* Signal conditioner DC
power supply
* A wide variety of output
modules available
* Safety UL/CSA/IEC1010–1
* EMC/CE EN61326
* Front panel sealed to NEMA
4X and IP65
**
Unique
*
Valuable
TEC-9300 Fuzzy Logic plus PID microprocessor-based con-
troller incorporates a bright, easy to read, 4-digit LED display
which indicates the process value. Fuzzy Logic technology
enables a process to reach a predetermined set point in the short-
est time, with the minimum of overshoot during power-up or
external load disturbance. The units are housed in a 1/16 DIN
case, measuring 48mm x 48mm with 75mm behind-panel depth.
The units feature three touch keys to select the various control
and input parameters. Using a unique function, you can put up to
five parameters at the front of the user menu by using SEL1 to
SEL5 found in the setup menu. This is particularly useful to
OEM’s as it is easy to configure the menu to suit the specific
application.
TEC-9300 is powered by 11–26VAC/VDC or 90–264VAC
supply, incorporating a 2 amp control relay output and dual 2 amp
alarm relay outputs as standard with a second alarm that can be
configured in the second output for cooling purposes or as a dwell
timer. Alternative output options include SSR drive, triac, 4–
20mA and 0–10 volts. TEC-9300 is fully programmable for
PT100, thermocouple types J, K, T, E, B, R, S, N, L, 0–20mA, 4–
20mA, and voltage signal input, with no need to modify the unit.
The input signals are digitized by using an 18-bit A to D convert-
er. Its fast sampling rate allows the TEC-9300 to control fast
processes such as pressure and flow.
Self-tuning can be used to optimize the control parameters as
soon as undesired control results are observed. Unlike auto-tun-
ing, self-tuning will produce less disturbance to the process dur-
ing tuning, and can be used at any time.
Digital communications formats RS-485, RS-232 or 4–20mA
retransmission are available as an additional option. These
options allow the TEC-9300 to be integrated with supervisory
control systems and software, or alternatively to drive remote dis-
plays, chart recorders, or data loggers.
Two different methods can be used to program the TEC-9300.
1. Use the keys on the front panel to program the unit manually;
2. Use a PC with setup software to program the unit via the RS-
485 or RS-232 COMM port.
PID control has been used and has proven to be an efficient
controlling method by many industries, yet PID has difficulty
dealing with some sophisticated systems such as second and
higher order systems, long time-lag systems, during set point
change and/or load disturbance circumstances, etc. The PID prin-
ciple is based on a mathematical model which is obtained by tun-
ing the process. Unfortunately, many systems are too complex to
describe precisely in numerical terms. In addition, these systems
may be variable from time to time. In order to overcome the
imperfections of PID control, Fuzzy Technology was introduced.
What is Fuzzy Control? It works like a good driver. Under differ-
ent speeds and circumstances, he can control a car well based on
previous experience, and does not require knowledge of the kinet-
ic theory of motion. Fuzzy Logic is a linguistic control which is
different from the numerical PID control. It controls the system
by experience and does not need to simulate the system precisely
as a PID controller would.
__
+
_
+
++
+
+
+
Figure 1.1
Fuzzy PID System Block
PID
+
FUZZY CONTROL
The function of Fuzzy
Logic is to adjust PID
parameters internally
in order to make
manipulation of out-
put value MV more
flexible and adaptive
to various processes.
The Fuzzy Rule may
work like this:
• If the temperature differ-
ence is large, and the tem-
perature rate is large, then
Δ
MV is large.
• If the temperature differ-
ence is large, and the tem-
perature rate is small, then
Δ
MV is small.
PID+Fuzzy Control
has been proven to be
an efficient method to
improve the control
stability as shown by
the comparison curves
at left: