Watlow MLS Manuel d'utilisateur Page 118
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106 MLS User’s Guide
Tuning and Control
General PID Constants
This section gives general PID constants.
Proportional Band Only (P)
Set the PB to 7% of the setpoint
Example
: Setpoint = 450, set the Proportional Band to 31.
Proportional with Integral (PI)
Set the PB to 10% of setpoint.
Example
: Setpoint = 450, set PB to 45.
Set TI to 60.
Set TD to Off.
Set the Output Filter to 2.
PI with Derivative (PID)
Set the PB to 10% of the SP.
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.
PB TI TD FIL OUTPUT CT Action
Electric heat with solid state
relays
50 60 15 4 TP 3 Reverse
Electric heat with mechani-
cal relays
50 60 15 6 TP 20 Reverse
Gas heat with motorized
values
60 120 25 8 DZC/DAC NA Reverse
Gas heat with motorized val-
ues (SP > 1200
°
F)
100 240 40 8 DZC/DAC NA Reverse
Extruders with cooling, Heat
with SSRs
50 300 90 8 TP 3 Reverse
Spread set to zero, cool with
solenoid valve
10 OFF OFF 4 TP 20 Direct
Cool with fans 10 OFF OFF 4 TP 60 Direct
Electric heat with open heat
coils
30 20 OFF 4 DZC NA Reverse
Electric heat with SCR con-
trollers
60 60 15 4 DZC/DAC NA Reverse
- User’s Guide 1
- Warranty 2
- Addendum for MLS User’s 3
- Guide (3.6) 3
- Mounting Environment 4
- Contents 7
- Contents MLS User’s Guide 10
- MLS User’s Guide Contents 11
- Overview 13
- System Diagram 14
- Parts List 14
- 4 MLS User’s Guide 16
- Introduction 17
- Specifications 19
- RTD Ranges 20
- Miscellaneous Specifications 20
- Digital Inputs 20
- Digital Outputs 21
- Standard Digital Outputs 21
- System Digital Outputs 21
- Miscellaneous Specifications 22
- Expanded Parts List 23
- Front Panel Description 24
- Installation 27
- Read This Before Installation 28
- Recommended Tools 29
- Mounting the MLS-PM 30
- MLS-PM Mounting Steps 31
- Mounting the MLS-AIM 32
- Mounting Steps 33
- Mounting the RTB 34
- Mounting the MLS-PS 35
- Wiring Your System 36
- Wiring Recommendations 37
- Cable Recommendations 38
- Noise Suppression 38
- Symptoms of RFI 38
- Avoiding RFI 38
- Testing Connections 40
- Testing Your System 42
- Outputs 43
- Ribbon Cable Recommendations 44
- Using the Cable Tie Wraps 44
- System safe 45
- (RTB pin 6) 45
- RTB Connections 46
- AIM Communications Failure 47
- Input Wiring Recommendations 49
- Input Scaling 49
- Scaling Values 49
- Input Calibration 50
- T/C Inputs 51
- Connecting Thermocouples 52
- RTD Inputs 52
- Current Inputs 53
- Voltage Inputs 53
- Unused Inputs 53
- Communications 54
- Recommended Wire Gauges 57
- 46 MLS User’s Guide 58
- Using the MLS 59
- Front Panel 60
- Front Panel Keys 61
- Yes (Up) 61
- No (Down) 61
- Man/Auto 62
- Ramp/Soak 62
- Alarm Ack 62
- Displays 63
- (blank) (blank) 64
- Interpreting Alarm Display 65
- Acknowledging an Alarm 66
- Operator Menus 68
- MAN/AUTO CONTROL 69
- Automatically Tuning a Loop 70
- How to enter the Setup menus? 71
- How to edit a menu? 71
- Setup Global Parameters Menu 73
- Save to Job 74
- Load from Job 74
- Job Select Inputs 75
- Controller Address 78
- Communications Error Checking 78
- Setup Loop Input 81
- Input Type 82
- Input Reading Offset 84
- Linear Scaling Menus 84
- }Line a r in put ty pe 85
- Display Format 86
- High Process Value 86
- High Reading 87
- Low Process Value 87
- Low Reading 87
- Input Filter 88
- Setup Loop Control Parameters 89
- Heat/Cool Control PB 90
- Heat/Cool Control TI 90
- Heat/Cool Control TD 90
- Heat/Cool Output Filter 91
- Heat/Cool Spread 91
- Setup Loop Outputs 92
- MLS User’s Guide 81 93
- Setup Loop Outputs? 93
- Heat or Cool Output Type 94
- SDAC Menus 95
- SDAC High Value 96
- SDAC Low Value 96
- Heat/Cool Output Action 96
- Heat/Cool Output Limit 97
- Heat/Cool Output Limit Time 97
- Heat/Cool Output Override 97
- Calculated by PID 98
- Setup Loop Alarms 99
- Alarm Types 100
- Failed Sensor Alarms 100
- Global Alarms 100
- Process Alarms 100
- • Alarm deadband 101
- • Loop alarm delay 101
- Alarm Delay 102
- High Process Alarm Setpoint 103
- High Process Alarm Type 103
- Deviation Band Value 104
- High Deviation Alarm Type 104
- Low Deviation Alarm Type 105
- Low Process Alarm Setpoint 106
- Low Process Alarm Type 106
- Alarm Deadband 107
- Loop Alarm Delay 107
- Manual I/O Test 108
- Digital Input Testing 109
- Using This Menu 109
- Keypad Test 109
- Test Digital Output 109
- Toggle Digital Output 110
- Tuning and Control 111
- Proportional Control 112
- Digital Output Control Forms 114
- Time Proportioning (TP) 114
- Analog Outputs 114
- Output Digital Filter 115
- Reverse and Direct Action 115
- General PID Constants 118
- MLS User’s Guide 107 119
- 108 MLS User’s Guide 120
- Tuning and Control 120
- Troubleshooting 121
- MLS-PM Has No Power 122
- Keys Don't Respond 123
- Checking Analog Inputs 123
- Checking PID Control Outputs 124
- Checking Digital I/O 124
- Computer Problems 125
- Serial Interface Problems 125
- Communications Problems 126
- Ground Loops 126
- Software Problems 127
- User-Written Software 127
- Changing the EPROM 128
- 118 MLS User’s Guide 130
- Linear Scaling Examples 131
- Glossary 133
- Glossary MLS User’s Guide 142
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