Watlow MLS Manuel d'utilisateur Page 136
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Glossary MLS User’s Guide
124
F
Fahrenheit
The temperature scale that sets the freezing point
of water at 32
º
F and its boiling point at 212
º
F at
standard atmospheric pressure. The formula for
conversion to Celsius is:
º
C=5/9 (
º
F-32
º
F).
Failed Sensor Alarm
Warns that an input sensor no longer produces a
valid signal. For example, when there are thermo-
couple breaks, infrared problems or resistance
temperature detector (RTD) open or short fail-
ures.
Filter
Filters are used to handle various electrical noise
problems.
Di
g
ital Filter
(DF)
—
A filter that allows the
response of a system when inputs change unreal-
istically or too fast. Equivalent to a standard
resistor-capacitor (RC) filter
Di
g
ital Ada
p
tive Filter
—
A filter that rejects
high frequency input signal noise (noise spikes).
Heat/Cool Out
p
ut Filter
—
A filter that slows
the change in the response of the heat or cool out-
put. The output responds to a step change by
going to approximately 2/3 its final value within
the numbers of scans that are set.
Fre
q
uenc
y
The number of cycles over a specified period of
time, usually measured in cycles per second. Also
referred to as Hertz (Hz). The reciprocal is called
the period.
G
Gain
The amount of amplification used in an electrical
circuit. Gain can also refer to the Proportional (P)
mode of PID.
Global Alarm
Alarm associated with a global digital output that
is cleared directly from a controller or through a
user interface.
Global Di
g
ital Out
p
uts
A pre-selected digital output for each specific
alarm that alerts the operator to shut down critical
processes when an alarm condition occurs.
Ground
An electrical line with the same electrical poten-
tial as the surrounding earth. Electrical systems
are usually grounded to protect people and equip-
ment from shocks due to malfunctions. Also
referred to a "safety ground".
H
Hertz(Hz)
Frequency, measured in cycles per second.
Hi
g
h Deviation Alarm
Warns that the process is above setpoint, but
below the high process variable. It can be used as
either an alarm or control function.
Hi
g
h Power
(As defined by ANAFAZE) Any voltage above
24 VAC or Vdc and any current level above 50
mAac or mAdc.
Hi
g
h Process Alarm
A signal that is tied to a set maximum value that
can be used as either an alarm or control function.
Hi
g
h Process Variable (PV)
See Process Variable (PV).
Hi
g
h Readin
g
An input level that corresponds to the high pro-
cess value. For linear inputs, the high reading is a
percentage of the full scale input range. For pulse
inputs, the high reading is expressed in cycles per
second (Hz).
I
Infrared
A region of the electromagnetic spectrum with
wavelengths ranging from one to 1,000 microns.
These wavelengths are most suited for radiant
- 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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