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Control Methods
On/Off Control
On/off control switches the output either full on or full off, depending on the
input, set point and hysteresis values. The hysteresis value creates a buffer zone
that increases the time interval that the output is off or on. With hysteresis set
to 0 the process value would stay closer to the set point, but the output would
switch on and off more frequently, causing “chattering.”
Set hysteresis with Output Hysteresis (PID Group).
Figure 4.7 — On/Off Control for Heating and Cooling
Watlow MicroDIN 4.7
Features
Hysteresis
Time
Temperature
Cooling Action switches
on at Startup
Process Temperature
Cooling Action Switches on when the
Process Temperature rises above the
Set Point plus the Hysteresis
Cooling Action Switches off when the Process Temperature
drops below the Set Point
Set Point
Set Point
Time
Temperature
Heating Action switches off when the Process Temperature
rises above the Set Point
Heating Action switches
on at Startup
Hysteresis
Process Temperature
Heating Action switches on when the Process Temperature
drops below the Set Point minus the Hysteresis
- MICRODIN 1
- User’s Manual 1
- Addendum 2
- Declaration of Conformity 3
- Meet the MicroDIN Team 4
- Safety Information 5
- Technical Assistance 5
- Your Feedback 5
- Table of Contents 6
- Chapter One: 7
- Setup Steps 9
- Indicator Lights 9
- Overview 10
- Chapter Two: 11
- Communications Setup 11
- Communications Overview 12
- EIA-485 Network 13
- Communication 14
- MicroDIN, A Modbus 15
- Remote Terminal Unit (RTU) 15
- Modbus Register Numbers 16
- Set Address/Baud Rate 17
- C D D C 18
- 8 None 1 1 19
- Chapter Three: 21
- Installation and Wiring 21
- Introduction 22
- Mounting the MicroDIN 23
- Figure 3.3 23
- Install and Wire 24
- To Mount MicroDIN 24
- To Dismount MicroDIN 24
- Input Wiring 26
- Output and Power Wiring 27
- Communications Wiring 28
- Wiring Examples 30
- Chapter Four: 33
- Features 33
- The System 34
- Power Limit 35
- Calibration Offset 36
- Filter Time Constant 37
- Sensor Selection 38
- Range Low and Range High 38
- Control Methods 39
- Proportional Control 40
- Alarm Set Points 43
- Alarm Hysteresis 43
- Process or Deviation Alarms 44
- Alarm Latching 44
- Alarm Silencing 45
- Panel Indicator Lights 46
- Open Loop Detect 46
- Bumpless Transfer 47
- Chapter Five 49
- Learn the Parameters 49
- System Group 50
- System Group continued 51
- Input Group 52
- Input Group continued 53
- Control Output Group 56
- Parameters 57
- Power Limit Set Point 57
- High Side Power 57
- Low Side Power 58
- Fixed Manual Output 58
- Operation Group 59
- Operation Group continued 60
- PID Group 61
- PID Group continued 62
- Alarm Output Group continued 66
- Error Group continued 70
- Characteristics Group 73
- Serial Number 2 74
- Software ID Number 74
- Software Revision 74
- Diagnostics Group continued 75
- Calibration Group continued 78
- Chapter Six: 81
- Operation and Calibration 81
- MicroDIN Startup 82
- MicroDIN Shutdown 83
- Operations 84
- • See p. 5.6 85
- Equipment Required 86
- Setup and calibration 86
- Appendix 87
- Writing a Modbus Application 88
- Packet Syntax 88
- Loop Back Command (0x08) 91
- Exception Responses 92
- Glossary 94
- Output #1: User selectable 99
- Output #2: User selectable 99
- A.14 Watlow MicroDIN 100
- Ordering Information 101
- 4.4, 5.6 102
- Watlow MicroDIN A.17 103
- Parameter Index 104
- Statement: 106
- Quality and 106
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