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Watlow EZ-ZONE
®
PM Integrated Controller • 133 • Chapter 9 Features
Proportional and (P) Control (cont.)
than the set point, and the cooling parameter takes effect when the process temperature is higher than
the set point.
Adjust the proportional band with Heat Proportional Band [`h;Pb] or Cool Proportional Band [`C;Pb] (Op-
erations Page, Loop Menu).
Proportional and Integral (PI) Control
The droop caused by proportional control can be corrected by adding integral (reset) control. When the system
settles down, the integral value is tuned to bring the temperature or process value closer to the set point. In-
tegral determines the speed of the correction, but this may increase the overshoot at startup or when the set
point is changed. Too much integral action will make the system unstable. Integral is cleared when the pro-
cess value is outside of the proportional band.
Adjust the integral with Time Integral [``ti] (Operations Page, Loop Menu).
Proportional, Integral and Derivative (PID) Control
Use derivative (rate) control to minimize the overshoot in a PI-controlled system. Derivative (rate) adjusts the
output based on the rate of change in the temperature or process value. Too much derivative (rate) will make
the system sluggish.
Derivative action is active only when the process value is within twice the proportional value from the set
point.
Adjust the derivative with Time Derivative [``td] (Operations Page, Loop Menu).
Dead Band
In a PID application the dead bands above and below the set point can save an application’s energy and wear
by maintaining process temperature within acceptable ranges.
Proportional action ceases when the process value is within the dead band. Integral action continues to
bring the process temperature to the set point.
Using a positive dead band value keeps the two systems from fighting each other.
Time
Temperature
PID Control
Set Point
Reduced Overshoot
Proportional Band
Proportional Band x 2
Heating Slows
Time
Temperature
Positive Dead Band
Set Point
Heat Output Active
Cool Output Active
- User’s Guide 1
- Integrated Controller Models 1
- Safety Information 2
- Warranty 2
- Technical Assistance 2
- Table of Contents 4
- Table of Contents (cont.) 5
- Chapter 1: Overview 7
- DeviceNet 8
- TCP, and Profibus DP 8
- A Conceptual View of the PM 9
- Getting Started Quickly 10
- Functions 11
- Remote Set Point Operation 12
- Function 15
- Chapter 2: Install and Wire 19
- 1/16 DIN (PM6) 19
- 1/4 DIN (PM4) Dimensions 22
- Installation 23
- Chemical Compatibility 24
- Dig I/O 5 & 6 26
- 485 Comms 26
- PM Integrated Isolation Block 27
- Low Power 28
- High Power 28
- Digital Input 5 - 6 28
- Digital Input 7 - 12 29
- Input 1, 2 Thermocouple 29
- Input 1, 2 RTD 29
- Digital Output 7 - 12 32
- Internal Supply 33
- Output 1, 3 Universal Process 34
- Output 2, 4 Switched DC 35
- Quencharc Wiring Example 37
- Ethernet LED Indicators 38
- Activity Status 39
- Link Status 39
- Network Status 39
- Module Status 39
- DeviceNet™ Communications 40
- Profibus DP Communications 42
- EZ-ZONE ST 43
- 2. Double click on Ports 44
- 1/16 (PM6) DIN 45
- 1/8 DIN (PM9) Horizontal 45
- 1/8 DIN (PM8) Vertical 45
- 1/4 DIN (PM4) 45
- Attention Codes 46
- Chapter 4: Home Page 48
- Default Home Page Parameters 48
- Modifying the Home Page 49
- Custom Menu Parameter Options 49
- Modifying the Display Pairs 50
- Header Name Definition 51
- Communication Protocols 52
- Profibus DP 54
- Chapter 5: Operations Page 55
- Chapter 6: Setup Page 70
- Navigating the Setup Page 70
- On (63) 99
- Watlow EZ-ZONE 100
- Chapter 7: Profiling Page 106
- Navigating the Profiling Page 106
- Starting a Profile 107
- Profiling Parameters 109
- Chapter 8: Factory Page 116
- Navigating the Factory Page 116
- Chapter 9: Features 122
- Chapter 9: Features (cont.) 123
- Tuning the PID Parameters 126
- Manual Tuning (cont.) 127
- Autotuning with TRU-TUNE+ 127
- Before Tuning 127
- How to Autotune a Loop 127
- Calibration Offset 128
- Calibration 128
- Filter Time Constant 129
- Sensor Selection 130
- Sensor Backup 130
- Scale High and Scale Low 130
- Range High and Range Low 130
- Receiving a Remote Set Point 131
- Ten Point Linearization 131
- Retransmit 132
- Resetting a Tripped Limit 133
- Control Methods 134
- On-Off Control 135
- Proportional and (P) Control 135
- Dead Band 136
- Dead Band (cont.) 137
- Variable Time Base 137
- Variable Time Base (cont.) 138
- Single Set Point Ramping 138
- Cascade Control 138
- Compressor Control 138
- Input 1 Output 1 139
- Alarm Hysteresis 140
- Alarm Latching 140
- Alarm Silencing 140
- Alarm Blocking 140
- Current Sensing 141
- Open Loop Detection 141
- Programming the EZ Key/s 141
- CIP Implicit Assemblies 146
- Compact Assembly Class 146
- Software Configuration 147
- Searching Network for Devices 148
- Single Loop Control 151
- Example 3: Square Root 152
- Example 4: Ratio 152
- Example 5: Differential 153
- Example 6: Cascade 153
- Curve A (PID) 154
- Curve B (Cascade) 154
- Curve C (Single-control) 154
- Example 8: Vaisala 155
- Motorized Valve Control 156
- Chapter 11: Appendix 157
- CIP Implicit Assembly 163
- Compact Class 1 A through 7 A 165
- Compact Class 1 B through 7 B 166
- Specifications 171
- Dimensions 173
- [`oF;t] Minimum Off Time 94 176
- Series EZ-ZONE 180
- 3 Year Warranty 181
- CUSTOMER 181
- SATISFACTION 181
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