Benutzeranleitung / Produktwartung PID Control Toolkit 371685C-01 des Produzenten National Instruments
Zur Seite of 39
LabWindows TM /CVI TM PID Control Toolkit User Manual LabWindows/CVI PID Control T oolkit User Manual May 2008 371685C-01.
Support Worldwide Technical Support and Product Info rmation ni.com National Instruments Corporate Headquarters 11500 North Mopac Expressway Aust in, Texas 78759-3504 USA Tel: 512 683 0100 Worldwide O.
Important Information Warranty The media on which you receive Natio nal In struments software are warranted not to fail to execute p rogramming instruction s, due to defects in materials and workmanship, for a period of 90 days from date of shipment, as eviden ced by receipt s or other documentation.
© National Instruments Corporation v LabWi ndows/CVI PID Contro l Toolkit User Manual Contents About This Manual Conventions ............ .............. .............. ........... .............. ............... .............. .............. ....... v ii Related Documentation .
Contents LabWindows/CVI PID Control Toolkit User Manual vi ni.com Converting between Percentage of Full S cale and Engineering Units ........... 3-9 Using PID on Real-Time (RT) Targets ......................... .............. .............. ...... 3-10 Using PID with DAQ Devices .
© National Instruments Corporation vii LabWi ndows/CVI PID Contro l Toolkit User Manual About This Manual The LabWindows/CVI PID Contro l Toolkit User Manual descri bes the PID Control T oolkit for LabWindo ws ™ /CVI ™ . The manual describes the features, functions, and operation of the toolkit.
© National Instruments Corporation 1-1 LabWin dows/CVI PID Control T oolkit User Manual 1 Over view of the PID Control T oolkit This chapter describes how to install the toolkit and describes Proportional-Integral-Deriv ati ve (PID) control applications.
Chapter 1 Overview of th e PID Control T oolkit LabWindows/CVI PID Control T oolkit User Manual 1-2 ni.com Activation Instructions The first time you launch LabWindo ws/CVI after installing the PID Co ntrol T oolkit, you are prompted to activ ate the toolkit.
Chapter 1 Overview of th e PID Control T oolkit © National Instruments Corporation 1-3 LabWin dows/CVI PID Control T oolkit User Manual PID Control Currently , the PID algorithm is the most comm on control algorithm used in industry .
© National Instruments Corporation 2-1 LabWin dows/CVI PID Control T oolkit User Manual 2 PID Algorithms This chapter explains the f ast PID, precise PID, and autotuning algorithms.
Chapter 2 PID Algorithms LabWindows/CVI PID Control T oolkit User Manual 2-2 ni.com Implementing the PID Algor ithm with the PID Functions This section describes how the PID Control T oolkit fu nctions implement the fast (positional) PID algorith m. The f ast PID algo rithm is th e default algorithm used in the PID Control T oolkit.
Chapter 2 PID Algorithms © National Instruments Corporation 2-3 LabWin dows/CVI PID Control T oolkit User Manual Output Limiting The actual controller output is limited to the range speci fied for control output, as fo llows: and The follo wing formula sho ws the prac tical model of the PID controller .
Chapter 2 PID Algorithms LabWindows/CVI PID Control T oolkit User Manual 2-4 ni.com The Precise PID Algorithm This section describes how the PID Control T o olkit functions implem ent the precise PID algorithm.
Chapter 2 PID Algorithms © National Instruments Corporation 2-5 LabWin dows/CVI PID Control T oolkit User Manual T rapezoidal Integration T rapezoidal integration is used to a void shar p changes in integral action when there is a sudden change in the PV or SP .
Chapter 2 PID Algorithms LabWindows/CVI PID Control T oolkit User Manual 2-6 ni.com Figure 2-2 illustrates the auto tuning procedure excited by the setpoint relay experiment, which connects a relay and an e xtra feedback si gnal with the SP . Noti ce that the PID Library autotuning functions directly implement this process.
Chapter 2 PID Algorithms © National Instruments Corporation 2-7 LabWin dows/CVI PID Control T oolkit User Manual Table 2-2. T uning Formula under P-Only Control (Normal) Contr oller K c T i T d P 0.2 K u — — PI 0.18 K u 0.8 T u — PID 0.25 K u 0.
Chapter 2 PID Algorithms LabWindows/CVI PID Control T oolkit User Manual 2-8 ni.com Note During tuning, the process remains under closed-loop PID control . It is not necessary to switch off the e xisting controll er and perform the experiment under open-loop conditions.
© National Instruments Corporation 3-1 LabWin dows/CVI PID Control T oolkit User Manual 3 Using the PID Control T oolkit This chapter contains the basic information you need to design a control strategy using the PID Control T oolkit functions.
Chapter 3 Using the PID Control T oolkit LabWindows/CVI PID Control T oolkit User Manual 3-2 ni.com T uning Controllers Manually The following controller tuning procedures are based on the work of Zi .
Chapter 3 Using the PID Control T oolkit © National Instruments Corporation 3-3 LabWin dows/CVI PID Control T oolkit User Manual Open-Loop (Step T est) T uning Procedure The open-loop (step test) tuning procedure as sumes that you can model an y process as a first-order lag and a pure deadtime.
Chapter 3 Using the PID Control T oolkit LabWindows/CVI PID Control T oolkit User Manual 3-4 ni.com Using the PID Librar y The following sections describe how to use th e PID Library to implement a control strateg y .
Chapter 3 Using the PID Control T oolkit © National Instruments Corporation 3-5 LabWin dows/CVI PID Control T oolkit User Manual The fast PID algorithm is faster and simpler than the precise PID algorithm. Use the fast algorithm in fast control lo ops.
Chapter 3 Using the PID Control T oolkit LabWindows/CVI PID Control T oolkit User Manual 3-6 ni.com Using PID with Autotuning Y ou can use autotuning to improv e controller pe rformance. There are tw o ways in which you can autotune a controller . • Wizard-Based Autotuning —Y ou can use the PID Autotuning W izard to tune the parameters.
Chapter 3 Using the PID Control T oolkit © National Instruments Corporation 3-7 LabWin dows/CVI PID Control T oolkit User Manual If you are using LabW indows/CVI 8.0 and later , click Add Addi tional Mod ule in the Drivers & Components tab of the Edit Installer dialog box.
Chapter 3 Using the PID Control T oolkit LabWindows/CVI PID Control T oolkit User Manual 3-8 ni.com Using PID with Lead-Lag The lead-lag compensator uses a positional algorithm that approximates a true exponential lead-lag. Feed forwar d control schemes often use this kind of algorithm as a dynamic compensator .
Chapter 3 Using the PID Control T oolkit © National Instruments Corporation 3-9 LabWin dows/CVI PID Control T oolkit User Manual Y ou can use the setpoint profiler as follo ws: 1.
Chapter 3 Using the PID Control T oolkit LabWindows/CVI PID Control T oolkit User Manual 3-10 ni.com value of 1 produces an output of 10 fo r a difference between the SP and PV of 10, regardless of the output range and setpoint range.
Chapter 3 Using the PID Control T oolkit © National Instruments Corporation 3-11 LabWi ndows/CVI PID Control T oolkit User Manu al The control loops can be timed in the following ways: • Software-Timed —In software-timed control loop s, the timing is controlled by the software loop rate.
© National Instruments Corporation A- 1 LabWin dows/CVI PID Control T oolkit User Manual A References The Instrument Society of America (ISA), the organization that sets standards for process control.
© National Instruments Corporation B- 1 LabWin dows/CVI PID Control T oolkit User Manual B T echnical Support and Professional Ser vices Visit the following sections of the award-winning National Instruments Web site at ni.com for technical support and professional services: • Support —T echnical support resources at ni.
Appendix B T echnical Support and Professional Services LabWindows/CVI PID Control T oolkit User Manual B-2 ni.com If you searched ni.com and could not find the answers you need, contact your local off ice or NI corporate h eadquarters. Phone numbers for our worldwide of f ices are listed at the front of this manual.
© National Instruments Corporation G-1 LabWin dows/CVI PID Control T oolkit User Manual Glossar y A algorithm A prescribed set of well-defined rules or processes for the solut ion of a problem in a finite number of steps.
Glossary LabWindows/CVI PID Control T oolkit User Manual G-2 ni.com D damping The progressiv e reduction or suppression of oscillation in a device or system. dead time (T d ) The interval of time, expressed in minutes, between initiation of an input change or stim ulus and the start of the resulting observable response.
Glossary © National Instruments Corporation G-3 LabWin dows/CVI PID Control T oolkit User Manual I Instrument Societ y of America (ISA) The organization that sets standards for process con trol instrumentation i n the United States. integral (control) action Control action in wh ich the output is proportional to the time int egral of the input.
Glossary LabWindows/CVI PID Control T oolkit User Manual G-4 ni.com O output limi ting Pre ve nting a controller’ s output from trav eling beyond a desired maximum range. ov ershoot The maximum excursion beyond the fi nal steady-state value of output as the result of an in put change.
Glossary © National Instruments Corporation G-5 LabWin dows/CVI PID Control T oolkit User Manual R ramp The total (transient plus steady-state) time respon se resulting from a sudden increase in the rate of change from zero to some f inite v alue of input stimulus.
© National Instruments Corporation I-1 LabWi n dows/CVI PID Control T oolkit User Manual Index A applications, 1-3 autotuning, 3-6 classic, 3-6 procedure, 3-6 wizard based, 3-6 distributing applicati.
Index LabWindows/CVI PID Control T oolkit User Manual I-2 ni.com I installation instructions, 1-1 instrument driv ers (NI resources), B-1 integral action, 2-1 integral time, 2-1 K Kno wledgeBase, B-1 L lag compensation, 3-8 lead compensation, 3-8 lead-lag compensator, 3-8 N National Instruments support and services, B-1 Nichols, N.
Index © National Instruments Corporation I-3 LabWi n dows/CVI PID Control T oolkit User Manual S setpoint, 1-3 relay experiment, 2-6 software (NI resources), B-1 step test tuning procedure, 3-3 suppo.
Ein wichtiger Punkt beim Kauf des Geräts National Instruments PID Control Toolkit 371685C-01 (oder sogar vor seinem Kauf) ist das durchlesen seiner Bedienungsanleitung. Dies sollten wir wegen ein paar einfacher Gründe machen:
Wenn Sie National Instruments PID Control Toolkit 371685C-01 noch nicht gekauft haben, ist jetzt ein guter Moment, um sich mit den grundliegenden Daten des Produkts bekannt zu machen. Schauen Sie zuerst die ersten Seiten der Anleitung durch, die Sie oben finden. Dort finden Sie die wichtigsten technischen Daten für National Instruments PID Control Toolkit 371685C-01 - auf diese Weise prüfen Sie, ob das Gerät Ihren Wünschen entspricht. Wenn Sie tiefer in die Benutzeranleitung von National Instruments PID Control Toolkit 371685C-01 reinschauen, lernen Sie alle zugänglichen Produktfunktionen kennen, sowie erhalten Informationen über die Nutzung. Die Informationen, die Sie über National Instruments PID Control Toolkit 371685C-01 erhalten, werden Ihnen bestimmt bei der Kaufentscheidung helfen.
Wenn Sie aber schon National Instruments PID Control Toolkit 371685C-01 besitzen, und noch keine Gelegenheit dazu hatten, die Bedienungsanleitung zu lesen, sollten Sie es aufgrund der oben beschriebenen Gründe machen. Sie erfahren dann, ob Sie die zugänglichen Funktionen richtig genutzt haben, aber auch, ob Sie keine Fehler begangen haben, die den Nutzungszeitraum von National Instruments PID Control Toolkit 371685C-01 verkürzen könnten.
Jedoch ist die eine der wichtigsten Rollen, die eine Bedienungsanleitung für den Nutzer spielt, die Hilfe bei der Lösung von Problemen mit National Instruments PID Control Toolkit 371685C-01. Sie finden dort fast immer Troubleshooting, also die am häufigsten auftauchenden Störungen und Mängel bei National Instruments PID Control Toolkit 371685C-01 gemeinsam mit Hinweisen bezüglich der Arten ihrer Lösung. Sogar wenn es Ihnen nicht gelingen sollte das Problem alleine zu bewältigen, die Anleitung zeigt Ihnen die weitere Vorgehensweise – den Kontakt zur Kundenberatung oder dem naheliegenden Service.
