Chapter 1 Overview; General - Brainchild C21 User Manual

Chapter 1 Overview

Chapter 1 Overview

1-1 General

1-1 General
The Fuzzy Logic plus PID microprocessor-based controller series,
incorporate a bright, easy to read 4-digit LED display, indicating
process value or set point value. The Fuzzy Logic technology
enables a process to reach a predetermined set point in the
shortest time, with the minimum of overshoot during power-up or
external load disturbance.
C21 is a 1/32 DIN size panel mount controller. C91 is a 1/16 DIN size
panel mount controller. These units are powered by 11-26 or 90-250
VDC/VAC supply, incorporating a 2 amp. control relay output as
standard. The second output can be used as cooling control, an
alarm or dwell timer. Both outputs can select triac, 5V logic output,
linear current or linear voltage to drive external device. There are
six types of alarm plus a dwell timer can be configured for the
second output.The units are fully programmable for PT100 and
thermocouple types J,K, T, E, B, R, S, N, L with no need to modify the
unit. The input signal is digitized by using a 18-bit A to D converter.
Its fast sampling rate allows the unit to control fast processes.
Digital communications RS-485 or RS-232 ( for C21, C91) are
available as an additional option. These options allow the units to be
integrated with supervisory control system and software.
A programming port is available for automatic configuration,
calibration and testing without the need to access the keys on front
panel.
By using proprietary Fuzzy modified PID technology, the control
loop will minimize the overshoot and undershoot in a shortest
time. The following diagram is a comparison of results with and
without Fuzzy technology.
UM0C911B 5