Download presentation
Presentation is loading. Please wait.
Published byEvan Fowler Modified over 9 years ago
1
2008 Indication Product Workshop Temperature / PID Controls
2
Temperature/PID Control We do that!
3
Why is this cool? Most monitored/controlled variable Market $850 million worldwide It is a core business for Red Lion 2007 best sales growth in years
4
How do we Compete? Offer Temperature and Process Models T16 Low Cost 1/16 DIN Controllers T48 Feature Rich 1/16 DIN Controllers TCU/TSC 1/8 DIN Controllers Built and Supported in the US Best Distribution Network
5
The Homerun Hitters
6
Positioning… Not recognized by customers Below the radar of competition Selling since 1991 About 11% of the Indication Sales On/off and PID control Not pretty, but offers some of the best control in the industry
7
Add all this up … and we are growing!!!
8
Intro to PID
9
On / Off Control Thermostat in house Typical Overshoot / Undershoot
10
Intro to PID On / Off Control Hysteresis slows oscillation Increases oscillation amplitude
11
Intro to PID What is PID? P = Proportional Band % of entire input span 0 – 100% output power integrated over this band I = Integral Time Time in seconds Adjusts output based on amount of error D = Derivative Time Also expressed in seconds Adjusts output based on rate of change
12
Intro to PID Proportional Only Control P band is expressed as a % of entire input span Type J thermocouple range is –200 o to 760 o C, or input span of 960 o C If P = 10 (%) 10% of 960 = 96 o 96 404
13
Intro to PID Proportional Only Control cont’d Lower P to 5% Type J thermocouple range is –200 o to 760 o C, or input span of 960 o C If P = 5 (%) 5% of 960 = 48 o 404 452 C 100 % 48 C
14
Intro to PID Proportional Only Control cont’d Lower P to 1% Type J thermocouple range is –200 o to 760 o C, or input span of 960 o C If P = 1 (%) 1% of 960 = 9.6 o 404 452 C 100 % 9.6 C The lower the P band, the higher the gain Back to “On/Off” control
15
Intro to PID Proportional, Integral Control Integral is time, in seconds, that Integral contribution will equal that of the Proportional contribution (to the output power) In this example, if Prop = 30% OP, Int adds 30% OP over 5 second timeframe 5 Sec Integral Time Looks at amount of error, and adds OP, over Integral timeframe, equivalent to the Prop contribution… Etc…
16
Intro to PID Proportional, Integral Control Integral contribution works to remove Steady State Error
17
Intro to PID Proportional, Integral, Derivative Control Derivative is also time, in seconds Derivative Time 10 Sec Etc… Derivative corrects for the rate of change taking place in the process Calculates future process value if rate of change continues for (Derivative Time), and adjusts OP accordingly Looks at rate of change
18
Intro to PID Proportional, Integral, Derivative Control Final result Final results may vary
19
PID Control with discrete outputs Time proportioning: Outputs are on for a percentage of the “Cycle Time” Cycle Time (CYCT): On period / Off period CYCT factory setting: 2 seconds Intro to PID
20
The “tcod” Value 0 = Fastest Response, more overshoot 1 = Medium Response, less overshoot 2 = Slowest Response, minimal overshoot Intro to PID Set before Autotune, the tcod allows you to decide how aggressively you want to reach setpoint
21
Auto Tuning Sequence Intro to PID
22
Application
23
Application Details Control mold oven temperature 1/16 DIN Mounting Main Control Relay Output No Alarm Capability Required Need a setpoint (100° F) Need Sensor, “J” Thermocouple Display Degrees in F Autotune Capability Need RS485 Comms
24
Product Selection Meter – T4810002 Sensor – TMPJ2SU2, “J” Thermocouple
25
Unit Installation
26
Wiring Connect TC to terminals 8 & 9 Connect AC power to terminals 11 & 12
27
Normal Display Mode
28
Unprotected Parameter Mode
29
Protected Parameter Mode
30
Hidden Function Mode
31
Configuration Parameters Configuration 1, Inputs (1-IN) Configuration 2, Outputs (2-OP) Configuration 3, Lockouts (3-LC) Configuration 4, Alarms (4-AL) Configuration 5, Cooling (5-O2) Configuration 6, Serial Comms. (6-SC) Configuration 7, Remote SP/HC (7-N2) Configuration 8, 2 nd Analog Out (8-A2) Configuration 9, Factory Settings (9-FS)
32
Connect comms to terminals 13 & 14 GREEN = 13 YELLOW = 14 Wiring
33
Let’s try Crimson!!
34
Review Application Details Control mold oven temperature 1/16 DIN Mounting Main Control Relay Output No Alarm Capability Required Need a setpoint (100° F) Need Sensor, “J” Thermocouple Display Degrees in F Autotune Capability Need RS485 Comms
35
Connect light bulb to terminals 4 & 12 Connect jumper to terminals 5 & 11 Wiring
36
Invoking Autotune Enter a setpoint Press and hold the “P” key to enter “Hidden” loop If necessary, use “P” key to scroll to “tUNE” Press the “up” arrow key to change from “no” to “yes” Press the “P” key to invoke Autotune
37
Invoking Autotune
38
PID Control… …we do that!!!
Similar presentations
© 2024 SlidePlayer.com Inc.
All rights reserved.