Chapter 1 Overview
Chapter 1 Overview
1-1 General Description
1-1 General Description
The ETR-3000 Smarter Logic PID microprocessor-based controller incorporates a bright, easy to read 4-digit LED
display. The front LED display can be programmed to indicate either the process value or set point value. Smarter
Logic technology enables a process to reach a predetermined set point in the shortest possible time, with minimum
overshoot during power-up or external load disturbance.
The ETR-3000 is a 1/32 DIN size panel mount controller. These units are powered by an 11-26 or 90-250 VDC/VAC
supply, incorporating a 2 amp control output relay as standard. The second output can be used as cooling control,
an alarm or dwell timer. Prior to shipment, both outputs can be independently configured as triac, 5V logic output,
linear current or linear voltage to drive an external device.
The units are fully programmable for RTD (PT100)
and thermocouple types J, K, T, E, B, R, S, N, L without need to physically modify the unit. The input signal is
digitized by using a 18-bit A to D converter. A fast sampling rate allows the ETR-3000 unit to control fast processes.
Digital communications RS-485 or RS-232 are available as an additional option. This option allows the units to be
integrated with a supervisory control system and/or 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(Smarter Logic), the control loop will minimize overshoot and
undershoot in the shortest time possible. The following diagram is a comparison of results with and without Fuzzy
technology.
There are six independent programmable alarm modes
plus a dwell timer that can be configured for the second output.
PID control when properly tuned
PID + Fuzzy control
Warm Up
Load Disturbance
Set
point
Temperature
Time
Figure 1.1
Fuzzy Control Advantage
Figure 1.1
Fuzzy Control Advantage
High Accuracy
High Accuracy
The ETR-3000 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 standard
Pt100 RTD’s ) 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 internal storage.
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