2008 Indication Product Workshop Temperature / PID Controls.
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Transcript of 2008 Indication Product Workshop Temperature / PID Controls.
![Page 1: 2008 Indication Product Workshop Temperature / PID Controls.](https://reader035.fdocuments.in/reader035/viewer/2022062422/56649e7d5503460f94b7fd58/html5/thumbnails/1.jpg)
2008 Indication Product Workshop
Temperature / PID Controls
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Temperature/PID Control
We do that!
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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
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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
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The Homerun Hitters
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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
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Add all this up …
and we are growing!!!
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Intro to PID
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Intro to PID
On / Off Control
Thermostat in house
Typical Overshoot / Undershoot
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Intro to PID
On / Off Control
Hysteresis slows oscillation
Increases oscillation amplitude
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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
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Intro to PID
Proportional Only Control P band is expressed as a % of entire
input span Type J thermocouple range is –200o to 760o C,
or input span of 960o C If P = 10 (%)
10% of 960 = 96o
96
404
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Intro to PID
Proportional Only Control cont’d Lower P to 5%
Type J thermocouple range is –200o to 760o C, or input span of 960o C
If P = 5 (%) 5% of 960 = 48o
404
452 C100 %
48 C
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Intro to PID
Proportional Only Control cont’d Lower P to 1%
Type J thermocouple range is –200o to 760o C, or input span of 960o C
If P = 1 (%) 1% of 960 = 9.6o
404
452 C
100 %
9.6 C
The lower the P band, the higher the gain
Back to “On/Off” control
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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 5 SecIntegral Time
Looks at amount of error, and adds OP, over Integral timeframe, equivalent to the Prop contribution…
Etc…
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Intro to PID
Proportional, Integral Control Integral contribution works to remove
Steady State Error
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Intro to PID
Proportional, Integral, Derivative Control Derivative is also time, in seconds
Derivative Time10 Sec 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
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Intro to PID
Proportional, Integral, Derivative Control Final result
Final results may vary
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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
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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
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Auto Tuning Sequence
Intro to PID
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Application
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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
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Product Selection
Meter – T4810002
Sensor – TMPJ2SU2, “J” Thermocouple
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Unit Installation
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Wiring
Connect TC to terminals 8 & 9
Connect AC power to terminals 11 & 12
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Normal Display Mode
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Unprotected Parameter Mode
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Protected Parameter Mode
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Hidden Function Mode
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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, 2nd Analog Out (8-A2)
Configuration 9, Factory Settings (9-FS)
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Connect comms to terminals 13 & 14
GREEN = 13YELLOW = 14
Wiring
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Let’s try Crimson!!
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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
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Connect light bulb to terminals 4 & 12
Connect jumper to terminals 5 & 11
Wiring
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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
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Invoking Autotune
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PID Control…
…we do that!!!