Watlow MLS User Manual Page 47
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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Installation
MLS User’s Guide 35
AIM Communications Failure
The controller continuously checks communications between the MLS-
PM and the AIM. If communication stops for more than five seconds,
the MLS-PM display indicates AIM COMM FAIL, the PID mode
changes to manual, and the controller sets every output to the output
override percentage.
WARNING
PID outputs remain in manual mode after an AIM
communications failure. After an AIM failure,
change the PID control status back to automatic
mode for each control loop.
An AIM communications failure also activates the global alarm output.
If you have selected a digital output from the Global Parameters menu,
an AIM communications failure also activates the output.
- 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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