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See all condition definitions – opens in a new window or tab For example, some controllers may provide excellent overshoot inhibition as an inherent characteristic, or perhaps superior response to setpoint changes.
The controller is a microprocessor-based instrument providing three-term control, namely PID control, with digital readout. This obtains a proper relationship between the Integral and Derivative time constants. Coon; Control Engineering; June ; pp Add to eufotherm list Remove from watch list. This value of PB, P, is referred to as the point of “ultimate sensitivity”. Learn more – opens in new window or eurothherm.
This item will be sent through the Global Shipping Programme and includes international tracking. Moreover, since most self-tuned controllers generate a Derivative setting, they cannot be used for tuning transport lags, such as diameter control loops or air flow systems. The self-tuning controller as described herein also has the capability of tuning by a plant-monitored process whereby the responses to perturbations are monitored and the tuning parameters modified if necessary. Please enter a number less than eurother, equal to 1.
A primary object of the invention is to provide self-tuning controllers having some or all of the following capabilities:. Shipping cost cannot be calculated. This item will be shipped through the Global Shipping Program and includes international tracking. Attain the required operating tmperatures as quickly as possible without eurohherm overshoot. See other eurootherm More As has been stated in the introductory portion of the specification, the self-tuning controller of the invention utilizes a microprocessor-based, 3-term controller having the structure and operational capability illustrated in FIGS.
Add to Watch list. At the detection of eurootherm the value of the derivative or slope of MV is recorded and the output of the heater power is set to zero and the Integral time counter is started. It came from the spare parts department.
Self-tuning controller – Eurotherm Corporation
In fact, Derivative Action should not be used to curb overshoot on start-up because the steady-state performance of the controller is seriously degraded. There are 1 items available. eurottherm
The manner in which the controller is modified for self-tuning in accordance with the invention is described hereinafter. For additional information, see the Global Shipping Program terms and conditions – opens in a new window or tab This amount includes applicable customs duties, taxes, brokerage and other fees.
See all webtraders has no other items for sale. Mouse over to Zoom – Click to enlarge. The method as set forth in claim 39, further comprising monitoring the control response to a perturbation; altering the PB setting if said at least one load characteristic does not attain setpoint within a particular time frame with respect to ITC with a given type power applied to the load.
Any international shipping and import charges are paid in part to Pitney Bowes Inc.
Will usually dispatch within 1 working day of receiving cleared payment – opens in a new window or tab. While that method may be excellent for “fine-tuning” a controller, it usually requires an extensive amount of experience to be commercially useful.
If such determination is negative, then the program returns to the controller routines via step No. Please look at all pictures and ask as many questions as you need before bidding or buying.
Estimated on or before Wed. When the aforementioned comparision indicates that the MV is not greater than the setpoint divided by “2”, the self-tuning algorithm proceeds to step No. Have one to sell? Integral Action, or Automatic Reset, is probably the most important factor governing control at setpoint.
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Eurotherm Corporation Reston, VA. A method as set forth in claim 18 wherein the step of classifying the controller response as being underdamped includes determining if the count in said integral counter is less than a predetermined percentage of its previously stored value with error MV-SP being less than “1”; if error MV-SP is greater than “1” returning the self-tuning control to a predetermined routine for controlling said at least one load characteristic; and if the count in said integral counter is less than “1” classifying the controller response as being under-damped.
Back to home page Return to top. Minimum monthly payments are required. A method as set forth in claim 17, further comprising returning the self-tuning control to a predetermined routine for controlling the controller, and re-entering the self-tuning programmed control at least subsequent to at least one of the steps of determining if error MV-SP is greater than a predetermined error criteria and within a predetermined approach control parameter, decreasing or increasing the PB setting by a fixed amount, determining if the count in said integral counter is greater than a second predetermined multiple, and repeating the steps of said adaptive mode control.
Each implementation of a PID algorithm behaves in a slightly different manner because of the subtle variations in the controller’s algorithm. The self-tuning controller as set forth in claim 37, wherein said calculating means determines if the count in said integral time counter is less than a predetermined percentage of the previously stored value, with error MV-SP being less than “1” and controller response classified as underdamped; said control means returning the self-tuning controller to a predetermined routine for controlling said at least one load characteristic with error MV-SP greater than “1”; and said classifying means classifying the controller response as being underdamped with the count in said integral counter less than “1”.
The item may be missing its original packaging, or the original packaging has been opened or is no longer sealed. There is also a limit to the adjustment range of the PID parameters so that the controller may not be applicable to loads which are very fast or have a high gain.
The associated controller in such instances requires re-tuning. Have one to sell? See full item description. If the up Detect Scroll Button has not been actuated the self-tuning algorithm returns to the controller routines via program step Additionally, such control systems generally require that the operator respond to a number of questions prior to, or during, tuning. Sign in for checkout Check out as guest.