2008 indication product workshop temperature / pid controls

2008 Indication Product Workshop

Temperature / PID Controls

Temperature/PID Control

We do that!

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

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

The Homerun Hitters

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

Add all this up …

and we are growing!!!

Intro to PID

Intro to PID

On / Off Control

Thermostat in house

Typical Overshoot / Undershoot

Intro to PID

On / Off Control

Hysteresis slows oscillation

Increases oscillation amplitude

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

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

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

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

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…

Intro to PID

Proportional, Integral Control Integral contribution works to remove

Steady State Error

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

Intro to PID

Proportional, Integral, Derivative Control Final result

Final results may vary

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

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

Auto Tuning Sequence

Intro to PID

Application

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

Product Selection

Meter – T4810002

Sensor – TMPJ2SU2, “J” Thermocouple

Unit Installation

Wiring

Connect TC to terminals 8 & 9

Connect AC power to terminals 11 & 12

Normal Display Mode

Unprotected Parameter Mode

Protected Parameter Mode

Hidden Function Mode

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)

Connect comms to terminals 13 & 14

GREEN = 13YELLOW = 14

Wiring

Let’s try Crimson!!

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

Connect light bulb to terminals 4 & 12

Connect jumper to terminals 5 & 11

Wiring

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

Invoking Autotune

PID Control…

…we do that!!!