Watlow MLS Manuel d'utilisateur Page 45
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Installation
MLS User’s Guide 33
PID Control and Alarm Output Connections
Typical digital control outputs use external optically-isolated solid-state
relays (SSRs). The SSRs use a 3 to 32 Vdc input for control, and you
can size them to switch up to 100 amps at 480 Vac. For larger currents,
use these optically-isolated relays to drive contactors.
NOTE
Control outputs are sink outputs. They are Low
when the output is On. Connect them to the nega-
tive side of Solid State Relays.
The next figure shows sample heat/cool and alarm output connections.
System Safe (Watchdog Timer) constantly monitors the MLS CPU. It is
a SINK output located on RTB terminal #6. (Do not exceed the 10
mAdc rating for the System Safe output.) Its output is Low (on) when
the CPU is operating; when it stops operating, the output goes High
(off), de-energizing the SSR.
Here's the recommended circuit for the System Safe output:
SSR
+
_
+5 Vdc
(RTB pin 2)
System safe
(RTB pin 6)
- 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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