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Before adjusting the temperature circuit... understand the basic knowledge of continuous temperature control

Temperature is one of the more common types of self-regulation, also known as non integral processes used in industry. Like other self regulating loops, when adjusting the corresponding controller output, the temperature loop often naturally stabilizes in a new working state. In addition, the behavior of temperature loops is nonlinear, and the process dynamics can vary greatly between different operating ranges. The latter attribute, especially the non-linear attribute, may hinder effective control if the task of the relevant PID is to control various and large quantities of production inputs. This scenario can even test the skills of experienced practitioners. The focus of this article is on temperature control in continuous processes.

When adjusting the temperature control loop, it is usually best to start testing the process dynamics of the PID loop from a carefully designed plan for both and collect good data. In addition to a good testing protocol, certain properties of temperature control are also worth noting:

Dynamic differences

Don't be fooled - the dynamics related to heating may be significantly different from those related to cooling. More importantly, insulation can amplify the difference between the two by hindering the natural thermodynamics of the system. It is essential to thoroughly test the design operational level of temperature processes by capturing dynamic process data (i.e. heating and cooling) above and below the set point.

Need patience

Generally speaking, temperature circuits react slowly. This is especially true for electric arc furnaces, rotary kilns, ovens, and other processes with high quality. Although it may take some time to complete the collision test, the benefits of obtaining good process data usually outweigh the drawbacks. If there is no good data, the accuracy of the process model will be questionable, and any adjustments to parameters resulting from this may backfire.

Alternating application

Consider applying different tuning - radical and conservative - to different regions of multi region processes. Large processes such as ovens and extruders have highly interactive characteristics. By shifting tuning from one region to the next, the trend of competition between adjacent regions will weaken. Another rule of thumb is to actively adjust one and the next area, as this can accelerate the recovery of the process from the interference of material inflow and outflow.

Derivative advantages

For practitioners who want to put WeChat business into practice, this is your opportunity. Although the limitations of derivatives have been widely documented, temperature processes involving significant inertia fully utilize the advantages of derivatives. Due to the low noise level in these applications, derivatives do not cause excessive wear and tear on related instruments. On the contrary, derivatives can prevent overshoot and improve the overall performance of the temperature loop.
 

Similarly, it is important to apply effective strategies to thoroughly test the dynamic characteristics of a given process and provide high-quality data for modeling and PID controller tuning. The controller adjustment seminar can be obtained from many suppliers. If you are not familiar with tuning regulator parameters, then consider attending a training seminar that focuses more on industry best practices rather than the use of specific PID tuning software. A small investment in training and skill development can bring significant benefits in both areas, including PID performance and overall control loop optimization in your factory.

Main product ：

ABB: Industrial robot spare parts DSQC series, Bailey INFI 90, IGCT, etc., for example: 5SHY6545L0001 AC10272001R0101 5SXE10-0181,5SHY3545L0009，5SHY3545L0010 3BHB013088R0001 3BHE009681R0101 GVC750BE101, PM866, PM861K01, PM864, PM510V16, PPD512 a10-15000 3BHE040375R1023, PPD113, PP836A, PP865A, PP877, PP881, PP885，etc.,

GE: spare parts such as modules, cards, and drivers. For example: VMIVME-7807, VMIVME-7750, WES532-111, UR6UH, SR469-P5-HI-A20, IS230SRTDH2A, IS220PPDAH1B, IS215UCVEH2A , IC698CPE010，IS200SRTDH2ACB，etc.,

Bently Nevada: 3500/3300/1900 system, Proximitor probe, etc.,for example: 3500/22M,3500/32， 3500/15, 3500/20，3500/42M，1900/27，etc.,

Invensys Foxboro: I/A series of systems, FBM sequence control, ladder logic control, incident recall processing, DAC, input/output signal processing, data communication and processing, such as FCP270 and FCP280，P0904HA，E69F-TI2-S，FBM230/P0926GU，FEM100/P0973CA，etc.,

Invensys Triconex: power module,CPU Module,communication module,Input output module,such as 3008,3009,3721,4351B,3805E,8312,3511,4355X，etc.,

Woodward: SPC position controller, PEAK150 digital controller, such as 8521-0312 UG-10D，9907-149, 9907-162, 9907-164, 9907-167, TG-13 (8516-038), 8440-1713/D，5466-258, 8200-226，etc.,

Westinghouse/Emerson: OVATION system, WDPF system, MAX1000 system spare parts, such as 1C31129G03, 5X00063G01, 5X00063G01，1C31181G01，SE3007, VE3008, etc


Rockwell Allen-Bradley：Logix 1756，1794，2711touch screen such as 2711-B6C20，etc.,

Rockwell ICS TRIPLEX：T8151B,T8311 ,T8403 ,T9431, T8480C，etc.,

Rockwell Reliance：PLC-MODULE，WR-D4007，0-57406-E，Y-3023-2-H00AA，etc.,


Schneider Modicon: Quantum 140 series processor, control card, power module, 

such as 140CPU65160, 140CPU67160, 140CPU43412，140CPU67060，140DDI35300，140ACO13000，140CRA93100，140CPU11303，140ACO13000，etc., 

Hima: Security modules, such as F8650E, F8652X, F8627X, F8628X, F3236, F6217,F6214， Z7138, F8651X, F8650X，etc.,

Honeywell: all DCS cards, modules, CPUS, such as: CC-MCAR01, CC-PAIH01, CC-PAIH02, CC-PAIH51, CC-PAIX02, CC-PAON01, CC-PCF901, TC-CCR014, TC-PPD011，CC-PCNT02，etc.,

Motorola: MVME162, MVME167, MVME172, MVME177 series, such as MVME5100, MVME5500-0163, VME172PA-652SE，VME162PA-344SE-2G，etc.,

Xycom: I/O, VME board and processor, for example, XVME-530, XVME-674, XVME-957, XVME-976，etc.,

Kollmorgen：Servo drive and motor，such as S72402-NANANA，S62001-550，S20330-SRS，CB06551/PRD-B040SSIB-63，etc.,

Bosch/Rexroth/Indramat: I/O module, PLC controller, driver module，MSK060C-0600-NN-S1-UP1-NNNN，VT2000-52/R900033828，MHD041B-144-PG1-UN，etc.,