Instruction manual

1
1–1 General
Tempco’s TEC-x100 Series Fuzzy Logic plus PID microproces-
sor-based controllers incorporate two bright easy to read 4-digit
L
ED displays, indicating process value and set point value. The
process value (PV) display is always the top digital display. The
setpoint (SV) display is always the bottom display. Fuzzy Logic
technology enables a process to reach a predetermined set point
in the shortest time with a minimum of overshoot during power-
up or external load disturbance.
TEC-9100 is a 1/16 DIN size panel mount controller. TEC-7100
is a 72×72 DIN size panel mount controller. TEC-8100 is a 1/8
DIN size panel mount controller and TEC-4100 is a 1/4 DIN size
panel mount controller. These units are powered by 11–26 or
90–250 VDC/VAC 50/60 Hz supply, incorporating a 2 amp con-
trol relay output as standard. The second output can be used as a
cooling control or an alarm. Both outputs can select triac, 5V
logic output, linear current, or linear voltage to drive an external
device. There are six types of alarm plus a dwell timer that can
be configured for the third output. The units are fully program-
mable for PT100 RTD and thermocouple types J, K, T, E, B, R,
S, N, and L with no need to modify the unit. The input signal is
digitized by using an 18-bit A to D converter. Its fast sampling
rate allows the unit to control fast processes.
Digital communications RS-485 or RS-232 (excluding TEC-
7
100) are available as an additional option. These options allow
the units to be integrated with supervisory control systems and
software.
A programming port is available for automatic configuration,
calibration, and testing without the need to access the keys on the
front panel.
By using proprietary Fuzzy modified PID technology, the con-
trol loop will minimize overshoot and undershoot in a short time.
The following diagram is a comparison of results with and with-
out Fuzzy technology.
High accuracy
This series is manufactured with custom
designed ASIC (Application Specific
Integrated Circuit) technology which
contains an 18-bit A to D converter for
high resolution measurement (true 0.1°F
resolution for thermocouple and PT100)
and a 15-bit D to A converter for linear
current or voltage control output. The
ASIC technology provides improved
operating performance, low cost,
enhanced reliability and higher density.
Fast sampling rate
The sampling rate of the input A to D
converter is 5 times/second. The fast
sampling rate allows this series to control
fast processes.
Fuzzy control
The function of Fuzzy control is to adjust
PID parameters from time to time in
order to make manipulation of the output
value more flexible and adaptive to vari-
ous processes. The result is to enable a
process to reach a predetermined set point
in the shortest time, with the minimum of
overshoot and undershoot during power-
up or external load disturbance.
Digital communication
The units are equipped with an optional
RS-485 or RS-232 interface cards to pro-
vide digital communication. By using
twisted pair wires, up to 247 units can be
connected together via RS-485 interface
to a host computer.
Programming port
A programming port can be used to con-
nect the unit to a PC for quick configura-
tion. It also can be connected to an ATE
system for automatic testing and calibra-
tion.
Auto-tune
The auto-tune function allows the user to
simplify initial setup for a new system.
An advanced algorithm is used to obtain
an optimal set of control parameters for
the process, and it can be applied either as
the process is warming up (cold start) or
when the process is in a steady state
(warm start).
Lockout protection
Depending on security requirements, one
of four lockout levels can be selected to
prevent the unit from being changed
without permission.
Bumpless transfer
Bumpless transfer allows the controller to
continue to control if the sensor breaks by
using its previous value. Hence, the
process can be controlled temporarily as
if the sensor is normal.
Soft-start ramp
The ramping function is performed dur-
ing power up as well as any time the set
point is changed. It can be ramping up or
ramping down. The process value will
reach the set point at a predetermined
constant rate.
Digital filter
A first order low pass filter with a pro-
grammable time constant is used to
improve the stability of the process value.
This is particularly useful in certain
applications where the process value is
too unstable to be read.
SEL function
The units have the flexibility to allow the
user to select those parameters which are
most significant to him and put these
parameters in the front of the display
sequence. Up to eight parameters can be
selected to allow the user to build his own
display sequence.
Chapter 1 Overview
Figure 1.1 Fuzzy Control Advantage