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Appendix B: Enhanced Process Control
Ratio Control
A chemical process requires a formula of two parts Water (H
2
O) to one
part Potassium Hydroxide (KOH) to produce diluted Potassium
Hydroxide. The desired flow of H
2
O is 10 gallons per second (gps), and
the KOH should be 5 gps. Each chemical has a pipe feeding a common
pipe. The flow rate of each feeder pipe is measured and supplied to a
4CLS, with H
2
O flow as PV1 and KOH flow as PV2. The outputs of
loops 1 and 2 adjust motorized valves.
1) Adjust and tune Loop 1 (H
2
O) for optimal performance before
implementing the Ratio setup.
2) Switch the controller to display loop 2 (KOH), and then enter the 3-
key sequence to display the following:
Display User Input
Press
Ye s
to setup the Ratio parameters
for loop 02.
Assign loop 01 to be the master loop.
Press
Enter
.
LOOP PROCESS UNITS
ALARM SETPOINT STATUS OUT%
SETUP LOOP 02
RATIO CONTROL?
LOOP PROCESS UNITS
ALARM SETPOINT STATUS OUT%
02 RATIO CONTROL
MSTR LOOP? 01
- User’s Guide 1
- Warranty 2
- Contents 3
- Using the CLS 49 4
- Setup 61 4
- PID Tuning and Control 97 6
- Troubleshooting 107 6
- Linear Scaling Examples 115 7
- Appendix A: Ramp Soak 119 7
- Glossary 163 8
- System Diagram 10
- Parts List 10
- 4 CLS User’s Guide 12
- Overview 12
- Introduction 13
- Specifications 15
- Digital Inputs 17
- System Digital Outputs 17
- Miscellaneous Specifications 19
- 12 CLS User’s Guide 20
- Installation 21
- Precautions and Warnings 22
- Recommended Tools 23
- CLS Mounting Procedure 24
- TB-18 Mounting Instructions 25
- TB-50 Mounting Instructions 26
- Grounding 29
- Thermocouple Wiring 30
- Input Wiring 30
- Output Wiring 31
- Communications Wiring 31
- Wiring: Noise Suppression 32
- General Wiring 33
- Connections Test 34
- Wiring Outputs 35
- 28 CLS User’s Guide 36
- Using the Cable Tie Wraps 37
- Configuring Outputs 37
- Watchdog Timer 38
- TB-18 Connections 39
- TB-50 Connections 40
- 16 CLS TB-50 Connections 41
- Input Scaling 42
- 4 and 8 CLS Scaling Values 43
- 4CLS: Voltage/Current Inputs 45
- 8CLS: Voltage/Current Inputs 45
- 4CLS: RTD/Thermister Inputs 45
- 8CLS: RTD/Thermister Inputs 45
- 16 CLS Scaling Values 46
- Scaling and Calibration 47
- T/C Inputs 47
- Connecting Thermocouples 48
- RTD Inputs (4 and 8 CLS only) 48
- Current Inputs 49
- Voltage Inputs 49
- Unused Inputs 50
- Serial Communications 51
- Configuring Communications 54
- Recommended Wire Gauges 55
- 48 CLS User’s Guide 56
- Using the CLS 57
- Front Panel 58
- Change SP 59
- Man/Auto 59
- Ramp/Soak 60
- Alarm Ack 60
- Displays 61
- Single Loop Display 62
- F 0 63
- Acknowledging an Alarm 64
- Job Display 65
- Operator Menus 66
- Manual Output Levels 67
- Autotune 68
- How to Enter the Setup Menus? 69
- How to edit a menu? 69
- Loop name? 70
- Set up Global Parameters Menu 71
- Load a Job 72
- Save Setup to Job 72
- Job Select Inputs 73
- Job Select Input Polarity 73
- Output Override Digital Input 74
- Start-up Alarm Delay 74
- Keyboard Lock Status 75
- Power-Up Output Status 75
- Controller Address 75
- Communications Baud Rate 76
- Communications Protocol 76
- Communications Error Checking 76
- AC Line Frequency 77
- Digital Output Polarity 77
- EPROM Information 77
- Set up Loop Input 78
- Input Type 79
- Pulse Sample Time 80
- Loop Name 80
- Input Units 80
- Input Reading Offset 81
- Linear Scaling Menus 81
- Variable 82
- InputR eading 82
- Display Format 83
- High Process Value 83
- High Reading 84
- Low Process Value 84
- Low Reading 84
- Input Filter 85
- Heat or Cool Control PB 87
- Heat or Cool Control TI 87
- Heat or Cool Control TD 87
- Heat or Cool Output Filter 88
- Heat and Cool Spread 88
- Set up Loop Outputs 89
- Heat or Cool Output Type 90
- SDAC Menus 91
- SDAC High Value 92
- SDAC Low Value 92
- Heat or Cool Output Action 92
- Heat or Cool Output Limit 93
- Heat or Cool Output Override 93
- Calculated by P ID 94
- Set up Loop Alarms 95
- Global Alarms 96
- Process Alarms 96
- High Process Alarm Setpoint 98
- High Process Alarm Type 98
- Deviation Band Value 99
- High Deviation Alarm Type 99
- Low Deviation Alarm Type 100
- Low Process Alarm Setpoint 100
- Low Process Alarm Type 101
- Alarm Deadband 101
- Alarm Delay 102
- Manual I/O Test 103
- Test Digital Output 104
- Toggle Digital Output 104
- Keypad Test 104
- PID Tuning and Control 105
- Control Modes 106
- Control Outputs 108
- Digital Output Control Forms 108
- Time Proportioning (TP) 109
- Analog Outputs 109
- Output Digital Filter 109
- Reverse and Direct Action 110
- Integral Term (TI) Settings 112
- Derivative Term (TD) Settings 112
- Proportional Band Only (P) 113
- PI with Derivative (PID) 113
- 106 CLS User’s Guide 114
- Troubleshooting 115
- Returning your Unit 116
- Checking an Analog Input 116
- Checking Digital I/O 117
- TB-18 and TB-50 Test 117
- Digital Input Testing 117
- Computer Problems 118
- Ground Loops 119
- Software Problems 119
- User-Written Software 119
- Changing the EPROM 119
- 114 CLS User’s Guide 122
- Linear Scaling Examples 123
- Example 2 124
- Example 3 125
- 118 CLS User’s Guide 126
- Linear Scaling 126
- Appendix A: Ramp Soak 127
- Configuring Ramp/Soak 128
- Setting the R/S Time Base 129
- Editing R/S Parameters 129
- Choosing a Profile to Edit 129
- LOOP PROCESS UNITS 130
- Editing the Ready Setpoint 131
- Editing a Segment 132
- Setting Segment Time 132
- Setting a Segment Setpoint 133
- Configuring Segment Events 133
- Editing Event Outputs 134
- Changing Event States 134
- Editing Segment Triggers 134
- Setting Segment Tolerance 136
- Ending a Profile 136
- Repeating a Profile 136
- Using Ramp/Soak 137
- Assigning a different profile 138
- Bar graph display 140
- Ramp/Soak Key Displays 140
- How long has the profile run? 141
- How many times has it cycled? 141
- Holding a profile 142
- Continuing a profile 142
- Resetting a profile 143
- 136 CLS User’s Guide 144
- Appendix B: Enhanced 145
- Process Control 145
- Process Variable Retransmit 147
- PV Retransmit Menus 148
- PV Assignment 148
- Minimum Input 149
- Minimum Output 149
- Maximum Input 149
- Maximum Output 150
- Cascade Control 151
- Cascade Control Menus 152
- Cascade Output Assignment 152
- Base Setpoint 153
- Minimum Setpoint 153
- Maximum Setpoint 153
- Heat Cascade Span 153
- Cool Cascade Span 154
- Ratio control 155
- Ratio Control Menus 156
- Ratio PV Assignment 156
- Control Ratio 156
- Remote Analog setpoint 157
- Differential Control 157
- Typical Applications 158
- Ratio Control 164
- Remote Setpoint 166
- Glossary 171
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