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In the event that cooling power is required, the cool ratio is decreased. Eurotherm Corporation Reston, VA.

However, the scope of the invention is to be measured by the following claims taking into consideration the range of equivalents for the elements of the invention. The self-tuning controller can also be started initially manually by the operator as follows. A significant feature of the self-tuning method of the eurofherm is the capability of modifying the PB by establishing a “response window” eurootherm which the response of the system eurotgerm monitored.

This amount is subject to change until you make payment. The scroll button is depressed until the operator detects that “tn” appears on the front panel display.

A flashing dot in the display confirms that a parameter value other than MV is being displayed and a timed interlock retains that value, unless a change is made, for a period of four to five seconds.

Eurotherm Temperature Control, Process Control, Measurement and Data Recording

Such a definition of “optimal tuning” may not suit every application and therefore the “tradeoffs” must be understood. The setpoint is divided by two. The recovery window of the self-tuning technique is established between 0.

The characteristic system oscillation frequency is a very accurate representation of the system’s responsiveness and therefore can be used to derive the controller time constants as is well known to those skilled in the system control art.

The item may be missing its original packaging, or the original packaging has been opened or is eurothegm longer sealed. The watchdog circuitry provides a reset for the microprocessor should a fault occur and ensures that the microprocessor is placed in the correct state of operation on start-up.


Moreover, the State-Variable 180 may not be commercially viable, as the marketplace, at the time of this invention, has accepted the PID approach to controller design. Email to friends Share on Facebook – opens in a new window eurohterm tab Share on Twitter – opens in a new window or tab Share on Pinterest – opens in 8810 new window or tab Add to Watch list. With reference to FIG. A method of self-tuning eurothdrm controller as set forth in claim 10, further comprising returning the start-up procedure to a predetermined routine for controlling said at least one load characteristic subsequent to said step of adding; and re-entering said start-up procedure from said predetermined routine upon at least one of manual command and in response to a sensed condition of said at least one load characteristic.

The item may have some signs of cosmetic wear, but is fully operational and functions as intended. Buy it now – Add to Watch list Added to your Watch list.

The “ideal” control situation is achieved when the PB is as narrow as possible without causing oscillation. As used herein, Gain, or more commonly Proportional Band, PB, simply amplifies the error between a desired setpoint and a measured value to establish a proper power level.

The Purchaser, by bidding on this equipment, indicates their acknowledgment of and agreement to the terms of this disclaimer. Such manual techniques, which are software-adaptable or implementable, could be termed “automated tuning”, wherein the computer or microprocessor automates the operator manipulations.

Self-tuning control algorithms are programmed into microprocessors which are capable of generating the control signals to follow the algorithm step-by-step, make decisions based on data obtained from peripheral measuring or sensing devices, and to perform calculations required by the self-tuning algorithm.

An outline of the procedure for the CLCM follows: If not, then the program returns to the controller routines via step No. The start-up, quarter-cycle tune evaluation actually only adds one ITC to the total setting time. None Royal Mail International Signed. The control system then undergoes a delay of approximately 15 seconds.


People who viewed this item also viewed. As has been stated repeatedly above, the Ziegler-Nichols and Cohen-Coon tehniques are based on a 4: International buyers and unusual domestic shipping please E-mail in advance for shipping and handling charges. Another control technique is Gain-Scheduling but that technique merely uses parameters, such as Gain or PB, which are adjusted according to prearranged criteria. Coon; Control Engineering; June ; pp Skip to main content.

Refer to eBay Return policy for more details. Thus, it is evident that the control algorithm of a self-tuning controller is extremely critical in achieving desirable, much less optimal, control of a process or system. Procedures for tuning conventional Proportional, Integral and Derivitive hereinafter PID controllers are well established and relatively simple to perform, but are often time-consuming. Add to Watch list.

LEDS on the front panel provide indication of alarms one and two, outputs one and two and a remote operation. For example, some controllers may provide excellent overshoot inhibition as an inherent characteristic, or perhaps superior response to setpoint changes.

This amount is subject to change until you make payment. Please enter 6 digits for the postal code. This item will be shipped through the Global Shipping Program and includes international tracking.

Most purchases from business sellers are protected by the Consumer Contract Regulations which give you the right to cancel the purchase within 14 days after eurotnerm day you receive the item. International buyers and unusual domestic furotherm please E-mail in. The program then proceeds to step No.

None of the specific initialization operations are of significance to the present invention as such procedures are primarily concerned with the circuitry of the controller utilized in conjunction with the self-tuning portion of the inventive method and apparatus, in this instance the controller.

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