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82 8LS User’s Guide
Tuning and Control
General PID Constants by Application
This section gives PID values for many applications. They are useful as
control values or as starting points for PID tuning.
Proportional Band Only (P)
PB: Set the PB to 7% of the setpoint (SP) (Example: Setpoint = 450, so
Proportional Band = 31).
Proportional with Integral (PI)
PB: Set the PB to 10% of SP (Example: Setpoint = 450, so PB = 45).
Set TI to 60.
Set TD to Off.
Set the Output Filter to 2.
PI with Derivative (PID)
PB: Set the PB to 10% of the SP (Example: Setpoint = 450, so PB = 45).
Set the TI to 60.
Set the TD to 15% of the TI (Example: TI = 60, so TD = 9).
Set the Output Filter to 2.
The next table shows general PID constants by application.
Application PB TI TD Filter Output Type Cycle Time Action
Electrical heat w/ SSR
(Solid State Relays)
50
º
60 15 4 TP or
DZC
3 Reverse
Electrical heat w/
Mechanical relays
50
º
60 15 6 TP 20 Reverse
Gas heat with motor-
ized valves
60
º
120 25 8 ANA NA
Gas heat SP>1200
100
º
240 40 8 ANA NA
Extruders w/cooling
Heat w/SSR
Set spread to 0
50
º
300 90 8 Cool-TP
Heat-DSC
3 Reverse
Cool w/ solenoid valve
10
º
Off Off 4 TP 20 Direct
Cool w/ fans
10
º
off Off 4 TP 60 Direct
Electric heat w/ open
heat coils
30
º
20 off 4 DZC NA Reverse
Electric heat w/ SCR
Controllers
60
º
60 15 4 ANA NA Reverse
- User’s Guide 1
- Warranty 2
- Contents 3
- Using the 8LS 37 4
- Setup 45 4
- Tuning and Control 75 5
- Troubleshooting 85 6
- Appendix A: Ramp Soak 89 6
- Appendix B: 8LS-CP 105 7
- Appendix C: 8LS Cascade 121 7
- Glossary 123 7
- System Diagram 10
- 4 8LS User’s Guide 12
- Overview 12
- Introduction 13
- Installation 17
- Read This Before Installation 18
- Mounting The 8LS 19
- 12 8LS User’s Guide 20
- External Wiring 21
- General Wiring Requirements 21
- Cable Recommendations 23
- Noise Suppression 24
- 130 VAC ratin 25
- RTB Connections 27
- Analog Inputs 28
- Common Mode Voltage 28
- Normal Mode Voltage 28
- Grounding 28
- Input Scaling 29
- Resistor Installation 30
- Voltage Inputs 31
- Milliamp Inputs 31
- Thermocouple Inputs 31
- RTD Inputs 32
- Pulse Input 33
- Carbon Probe Input 33
- Control Outputs 35
- Pid Control Relay Outputs 36
- Primary Analog Outputs 37
- CPU Dip Switch 39
- RS-232 Connections 41
- RS-485 Description 42
- RS-485 Connections 43
- Using the 8LS 45
- Ramp/Soak 47
- Man/Auto 47
- Displays 48
- Single Loop Display 49
- Scanning Display 49
- Alarm Display 49
- SP ? 25 51
- 6 = AUTO 51
- SET? TUNE 51
- 6 SET MAN 52
- How to enter the Setup menus? 53
- How to edit a menu? 53
- (T/C & RTDs) 54
- 1 1 1 1 1 1 1 1 54
- GLOBALS? 55
- Save as Job 56
- Restore a Job 56
- Set Alarm Delay 56
- Set R/S Time Base 57
- Lock Panel 57
- Power Up Output Status 57
- CONTRLLR 58
- ADDR? 1 58
- COMM ERR 58
- CHK? BCC 58
- Communication Baud Rate 59
- Communication Protocol 59
- AC Line Frequency 59
- EPROM Version 60
- 1 SETUP 61
- INPUT? 61
- 1 INPUT 62
- TYPE? J 62
- 1 INPUT 63
- SMPLT? 1 63
- 1 INPUT 63
- UNIT = F 63
- Linear Scaling Menus 64
- High PV Display 64
- High RDG Display 64
- Low PV Display 64
- 1 LO RDG 65
- 1 OFFSET 66
- 1 SETUP 67
- CONTROL ? 67
- Heat/Cool PB 68
- Heat/Cool TI 68
- Heat/Cool TD 68
- Heat/Cool Output Filter 68
- 1 CONTROL 69
- SPR? 10 69
- OUTPUTS? 70
- 1 OUTPUTS 71
- CT ? 10 71
- ACT ?REV 72
- LIM ? 100 72
- LTM ? C 73
- NLO ?OFF 73
- 1 HT OUT? 74
- TERM BLK 74
- Setup Alarms 75
- Alarm Types 76
- Global Alarms 76
- Process Alarms 76
- High Process Alarm Setpoint 77
- High Process Alarm Status 77
- Deviation Band Alarm 78
- Deviation Band Alarm Status 78
- Low Process Alarm Setpoint 79
- Low Process Alarm Status 79
- Alarm Deadband 80
- Alarm Delay 80
- INS = 1 1 1 1 81
- TEST OUT 82
- NR = 1 82
- DIG OUT 82
- NR01? OFF 82
- Tuning and Control 83
- Control Modes 84
- Digital Output Control Forms 86
- Time Proportioning (TP) 86
- Output Digital Filter 87
- Reverse and Direct Action 87
- Integral Term (TI) Settings 89
- Derivative Term (TD) Settings 89
- Proportional Band Only (P) 90
- PI with Derivative (PID) 90
- 8LS User’s Guide 83 91
- 84 8LS User’s Guide 92
- Troubleshooting 93
- Computer Supervised Systems 94
- Communications Problems 95
- Serial Interface 95
- 88 8LS User’s Guide 96
- Appendix A: Ramp Soak 97
- Configuring Ramp/Soak 98
- Setting the R/S Time Base 99
- Editing R/S Parameters 99
- Choosing a Profile to Edit 99
- R/S PRO 100
- COPY? H 100
- A OUTTOL 100
- T? 1:00 100
- Editing the Ready Setpoint 101
- Editing a Segment 102
- Setting Segment Time 102
- A SEG 01 103
- SP? OFF 103
- EVENTS? 103
- Editing Event Outputs 104
- Changing Event States 104
- Editing Segment Triggers 104
- 1234 56 78 105
- Setting Segment Tolerance 106
- Ending a Profile 106
- Repeating a Profile 106
- 1 SELECT 107
- PROF? 0 107
- 1A00/20S 108
- SET? RUN 108
- 3 73 F 109
- 73 S 0 109
- Bar graph display 110
- Ramp/Soak Key Displays 110
- How long has the profile run? 110
- CYC 1/1 111
- SET?HOLD 111
- RESET? A 112
- Appendix B: 8LS-CP 113
- System Configuration 114
- Specifications 116
- CP Control 117
- Applications 118
- Carbon Probe 119
- Probe Burn Off 120
- Burn Off Function 121
- 1 INPUTS 122
- TYPE? K 122
- 2 INPUTS 122
- TYPE? CP 122
- CO+CO2% and % of Hydrogen 123
- Engineering Units 123
- 2 OFFSET 124
- ? 0 ºF 124
- 2 CP 124
- BURNOFF? 124
- Burn Off Time Interval 125
- Burn Off start Input 125
- Burn Off Time Period 126
- 2CP GAS 127
- OUTPN? 0 127
- 2 HIT %CP 127
- . 25 M 0 127
- 120 8LS User’s Guide 128
- Appendix C: 8LS Cascade 129
- Choosing the Primary Loop 130
- Glossary 131
- 132 8LS User’s Guide 140
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