Vaisala MMT330 Bedienungsanleitung Seite 121
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Chapter 4 _________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 121
Hysteresis
Hysteresis function is to prevent the relay switching back and forth when
the measured value is near to the setpoint values.
Relay is activated when the measured value passes the exact value of the
setpoint. When returning and passing the setpoint again relay is not
released before the value reaches the setpoint increased/decreased by the
hysteresis value.
Hysteresis should be smaller than difference of the setpoints.
Example: When the 'active above' value aw is 0.6 and the hysteresis
value is 0.05, relay activates when the aw reaches 0.60. As the humidity
decreases, relay releases at 0.55.
NOTE
If both setpoints are specified and "above" setpoint is lower than
"below" setpoint, the hysteresis works in the opposite direction, that is,
relay is
released when the measured value passes the exact value of the
setpo
int.
Relay Indicating Transmitter Error Status
You can set a relay to follow the operation status of the device. By
selecting FAULT/ONLINE STATUS for output quantity a relay changes
state on the basis of the operation status as follows:
FAULT STATUS
Normal operation: relay active (C and NO outputs are closed)
Not measuring state (error state or power off): relay released (C and NC
outputs are closed)
ONLINE STATUS
Live measurement (data available): relay active (C and NO outputs are
closed)
No live data (for example: error state, chemical purge or adjustment
mode): relay released (C and NC outputs are closed)
See Figure 60 on page 122 for illustrative examples of the
FAULT/ONLINE STATUSrelay output modes.
- USER'S GUIDE 1
- Table of Contents 3
- CHAPTER 4 4
- CHAPTER 6 6
- CHAPTER 7 6
- CHAPTER 8 7
- APPENDIX A 7
- List of Figures 9
- List of Tables 11
- GENERAL INFORMATION 13
- Version Information 14
- Documentation Conventions 14
- ESD Protection 15
- Recycling 16
- Regulatory Compliances 16
- Patent Notice 18
- Trademarks 18
- Software License 18
- Warranty 18
- PRODUCT OVERVIEW 19
- Basic Features and Options 20
- Structure of the Transmitter 20
- 0604-006 21
- Probe Options 22
- Typical Applications 23
- Transformer Oil 24
- 0510-029 25
- INSTALLATION 27
- 183 (7.20) 28
- 133 (5.24) 28
- 59 (2.32) 28
- Thickness 28
- 9.5 (0.37) 28
- Pole or Pipeline 29
- 0503-007 30
- 0503-041 30
- 0503-008 31
- 0509-051 31
- Panel Mounting Frame 32
- Cable Bushings 33
- Grounding the Cables 34
- WARNING 36
- CAUTION 38
- 0510-030 39
- 0509-144 40
- 0509-150 40
- 0510-028 42
- Tightening the Clasp Nut 43
- 0507-043 45
- Sampling Cell for MMT338 47
- Optional Modules 48
- Installation 49
- Warnings 50
- Third Analog Output 53
- Installation and Wiring 54
- RS-422/485 Interface 56
- Figure 34 4-Wire RS-485 Bus 59
- 1102-027 60
- LAN Interface 61
- WLAN Interface 62
- Data Logger Module 63
- 0706-068 64
- 8-Pin Connector 65
- OPERATION 67
- Graphic History 68
- 0706-030 69
- Menus and Navigation 70
- Rounding Setting 71
- Display Backlight Setting 71
- Display Contrast Setting 71
- Keypad Lock (Keyguard) 72
- Menu PIN Lock 72
- Display Alarms 73
- Configuring a Display Alarm 74
- 0802-070 75
- Serial Line Communication 78
- User Port Connection 79
- Service Port Connection 80
- LAN Communication 81
- IP Configuration 82
- Wireless LAN Configuration 85
- Communication Protocol 88
- Terminal Program Settings 89
- 0810-070 90
- 0810-071 91
- List of Serial Commands 92
- Serial Line 94
- Outputting Reading Once 95
- General Settings 97
- Date and Time 100
- Data Filtering 101
- Device Information 102
- Serial Output Settings 106
- Using Serial Line 107
- Data Recording 110
- View Recorded Data 111
- Deleting the Recorded Files 113
- Analog Output Settings 114
- Analog Output Quantities 115
- AMODE/ASEL 116
- Analog Output Tests 117
- Operation of Relays 119
- 1102-007 120
- Hysteresis 121
- 1102-040 122
- Enabling/Disabling Relays 123
- Setting Relay Outputs 123
- 1105-002 124
- Testing Operation of Relays 126
- CHAPTER 5 127
- Taking Modbus into Use 128
- Enabling Serial Modbus 129
- Enabling Ethernet Modbus 130
- 1101-034 131
- 1101-036 131
- Diagnostic Modbus Counters 133
- Disabling Modbus 134
- MAINTENANCE 135
- Changing the Sensor 136
- Error States 137
- Table 29 Error Messages 138
- Technical Support 139
- Product Returns 139
- CALIBRATION AND ADJUSTMENT 141
- Cleaning the Sensor 142
- Relative Humidity Adjustment 143
- Using Display/Keypad 144
- Temperature Adjustment 147
- Analog Output Adjustment 149
- TECHNICAL DATA 151
- Operating Environment 152
- Probe Specifications 152
- Inputs and Outputs 153
- Mechanics 153
- Modules 154
- Relay Module 155
- RS-485 Module 155
- LAN Interface Module 155
- WLAN Interface Module 155
- Spare Parts and Accessories 156
- CABLE BUSHINGS 157
- WINDOWS SOFTWARE 157
- Dimensions (mm/inch) 158
- 92 (3.62) 159
- 116 (4.57) 159
- 0509-149 160
- 0509-146 160
- MMT338 161
- MODBUS REFERENCE 163
- Register Map 164
- 16-Bit Integer Format 165
- Measurement Data (Read-Only) 166
- Status Registers (Read-Only) 166
- Exception Status Outputs 167
- Diagnostic Sub-Functions 168
- Exception Responses 169
- *M210764EN* 171
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