Watlow MLS-PM User Manual Download Page 143

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Glossary

MLS

User’s

Guide

130

Summary of Contents for MLS-PM

Page 1: ...service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE IN...

Page 2: ...11570 00 Revision 3 7 November 1995 Watlow Controls 1241 Bundy Blvd Winona MN 55987 Customer Service Phone 800 414 4299 Fax 800 445 8992 Technical Support Phone 507 494 5656 Fax 507 452 4507 Email wi...

Page 3: ...Watlow Anafaze Incorporated There shall be no warranty or liability for any products or parts that have been subject to misuse accident negligence failure of electric power or modification by the Cus...

Page 4: ...next manual revision System Power Requirements from page 10 Dimensions and Weight from page 10 MLS PM supply input 10 28 Vdc at 1 amp MLS AIM supply input 4 75 to 5 25 Vdc at 0 5 amp supplied by MLS...

Page 5: ...information Choose a power supply that supplies a regulated 10 to 28 Vdc at 1 watt and isolated return line Mounting Environment The MLS PS measures 1 40 x 8 x 3 9 Leave enough clearance around the po...

Page 6: ...s Guide 11570 00 rev 3 6 III Wiring Your System from page 24 This section explains how to wire the components of your system Below is the system connections diagram reprinted here for your convenience...

Page 7: ...end of the input wiring shield to the MLS panel s 120 240 Vac panel ground and connect one end of the output wiring shield to the MLS panel s 120 240 Vac panel ground If your system requires a differ...

Page 8: ...cription 13 MLS AIM and AIM TB Technical Description 13 MLS Cabling Technical Description 14 Installation 15 Read This Before Installation 16 Recommended Tools 17 Panel Hole Cutters 17 Other Tools 17...

Page 9: ...puts 41 Unused Inputs 41 Communications 42 Changing Communications 42 Connecting RS 232 Communications 42 Connecting RS 485 Communications 43 Recommended Wire Gauges 45 Using the MLS 47 Front Panel 48...

Page 10: ...Input Type 70 Pulse Sample Time 71 Loop Name 71 Input Units 71 Input Reading Offset 72 Linear Scaling Menus 72 Display Format 74 High Process Value 74 High Reading 75 Low Process Value 75 Low Reading...

Page 11: ...m Deadband 95 Loop Alarm Delay 95 Manual I O Test 96 Digital Input Testing 97 Keypad Test 97 Test Digital Output 97 Toggle Digital Output 98 Tuning and Control 99 Introduction 99 Control Modes 99 On O...

Page 12: ...nalog Inputs 111 Checking PID Control Outputs 112 Checking Digital I O 112 Checking Computer Supervised Systems 113 Computer Problems 113 Serial Interface Problems 113 Communications Problems 114 Soft...

Page 13: ...Contents MLS User s Guide vi...

Page 14: ...scription of the MLS and its related specifications Installation Describes how to install the MLS and its peripheral devices Using the MLS Provides an overview of operator displays used for system mon...

Page 15: ...l parts have been shipped Please don t hesitate to call Watlow Anafaze s Technical Service Department if you have problems with your shipment or if the MLS components are missing or damaged Parts List...

Page 16: ...rd exists could result in damage to equipment and property and injury to personnel The MLS includes a reset circuit that sets the control outputs off or to the data stored in memory if the microproces...

Page 17: ...4 MLS User s Guide Overview...

Page 18: ...LS automatically scales linear inputs used with other industrial process sensors To scale inputs simply enter any two measurement points For example to scale a pH sensor enter the endpoints the low PV...

Page 19: ...store up to 8 jobs in protected memory and access them by entering a single job number Each job is a set of operating conditions including setpoints and alarms so if a single oven produces multiple p...

Page 20: ...age 10 V from or input to analog common Common mode voltage 500 Vac maximum analog common to MLS PM or MLS AIM power supply common CMR Common Mode Rejection 85 dB at 60 Hz 110 dB typical A D converter...

Page 21: ...The Watlow Anafaze Digital to Analog Converter DAC is an optional module for MLS and CLS controllers It lets you convert a distributed zero crossing output signal to an analog process control signal...

Page 22: ...ystems have dual outputs 32 loop systems have 32 single outputs and you can individually configure outputs 17 32 as a second out puts for loops 1 16 PID control outputs Time Proportioning Distributed...

Page 23: ...m of ANSI X3 28 1976 D1 F1 compatible with Allen Brad ley PLC full duplex MLS PM supply input 10 28 Vdc at 1 amp MLS AIM supply input 4 75 to 5 25 Vdc at 0 5 amp supplied by MLS PM MLS PS system power...

Page 24: ...The MLS uses 6 pin telephone style connectors for internal and external communications The firmware s operating intelligence resides in the plug in EPROM so it s easy to update or change the MLS firm...

Page 25: ...id crystal display The LCD has 16 alphanumeric or graphic characters per line it is backlit for viewing under low light conditions The 8 key keypad and on board keyboard scanner allow you to change th...

Page 26: ...nsors and pass them to the MLS PM The MLS AIM TB contains the power supply terminals input signal wiring screw terminals input signal conditioning circuits and terminal connections for the AIM s plug...

Page 27: ...05 space conductor zoned 50 pin cable Pin 1 is at the red edge of the cable The cables which connect the MLS PM to the AIM TB the optional Smart I O Module SIOM and the computer are 6 conductor shiel...

Page 28: ...you may wish to use the Quick Start foldout to install this system This section explains installation for the MLS Controller only If you are installing another Watlow Anafaze product such as a Relay...

Page 29: ...contact between wires and the grounded case Tin any stranded wire Support power input and output cables to reduce strain on the terminals and to prevent wire removal DANGER Shut off power to your proc...

Page 30: ...ther lightweight panel doors Other Tools You ll also need these tools A Phillips head screwdriver A flathead screwdriver for wiring A multimeter A phone connector crimping tool made of metal optional...

Page 31: ...nent of the MLS The processor module s placement affects placement and wiring for the MLS AIM MLS PS etc Mounting Environment Install the MLS PM in a location free from excessive 50 C heat dust and un...

Page 32: ...ibbler or jigsaw file the edges of the hole WARNING Make sure bits of wire and debris do not lodge in the electronics or else make sure you clean the electronics before you connect power 2 Insert the...

Page 33: ...an MLS AIM TB with scaling inputs from Watlow Anafaze the scaling resistors are already installed Mounting Environment Install the MLS AIM in a location free from excessive 50 C heat dust and unautho...

Page 34: ...o position the holes 3 Drill four 6 or 8 holes in the chosen location 8 holes provide more clearance 4 Place the MLS AIM where you will mount it Insert the 6 screws in the plastic standoffs and tighte...

Page 35: ...Anafaze recommends Phoenix Contact s NS32 perforated DIN rail part number 12 01 00 2 Mount the DIN rail according to Phoenix Contact s instructions and slide the RTB onto it WARNING Do not connect pow...

Page 36: ...ion Choose a power supply that supplies a regulated 7 28 Vdc at 1 watt and isolated return line Mounting Environment The MLS PS measures 1 75 x 8 x 5 Leave enough clearance around the power supply tha...

Page 37: ...de Installation Wiring Your System This section explains how to wire the components of your system Below is the system connections diagram reprinted here for your convenience See the next page for wir...

Page 38: ...inter mittent connections when you move it for maintenance Use 18 or 20 AWG wire Larger or smaller sizes may be difficult to install may break easily or may cause intermittent connections Use shielded...

Page 39: ...afaze for repair Avoiding RFI Where possible use solid state relays SSRs instead of electrical mechanical EM relays If you must use EM relays try to avoid mounting them in the same panel as Watlow Ana...

Page 40: ...ou refer to the system connections diagram for more information These instructions are written for non electricians If you are an experienced electrician they may seem elementary to you If so feel fre...

Page 41: ...and V terminals from the MLS PM 2 Unplug the AIM cards from the AIM TB Carefully insert a screwdriver in the hole on the side of the AIM s metal jacket Gently press the screwdriver blade against the m...

Page 42: ...s are within the limits described above A Turn off the power B Carefully insert the AIM cards back into the AIM Terminal Block C If you have unplugged the AIM COMM cable plug it back in D Press and ho...

Page 43: ...5Vdc supply at the RTB A Connect the voltmeter s Common lead to RTB terminal 3 B Connect the voltmeter s Power lead to RTB screw terminal 1 The voltage should be 4 75 to 5 25 Vdc C Connect the Power...

Page 44: ...ground since you may create ground loops If you expect grounding problems use isolated solid state relays and isolate the control device inputs The MLS provides dual PID control outputs for each loop...

Page 45: ...ithstand much flexing Do not exceed 15 of 50 conductor cable Using the Cable Tie Wraps When you have wired outputs to the TB 50 install the cable tie wraps shipped with it This diagram shows the cable...

Page 46: ...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 Ti...

Page 47: ...Output 27 Heat 27 Cool 11 25 DIG Output 9 Heat 9 26 DIG Output 26 Heat 26 Cool 10 27 DIG Output 10 Heat 10 28 DIG Output 25 Heat 25 Cool 9 29 DIG Output 11 Heat 11 30 DIG Output 24 Heat 24 Cool 8 31...

Page 48: ...es 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 co...

Page 49: ...ing resistor locations The loop input number is marked on the terminal block the number 1 indicates an input for loop 1 the number 2 an input for loop 2 etc The A terminal is the positive input of the...

Page 50: ...ow Anafaze can supply factory installed input scaling resistors order option MLS SI XX See the next table for standard scaling resistor values or special input kits MLS SIK XX call Watlow Anafaze for...

Page 51: ...steps to use the MLS offset and span calibration 1 Install scaling resistors that will provide an appropriate full scale volt age If you have any doubts about your ability to install scaling resis to...

Page 52: ...all grounded T C assemblies in the system Make sure there is no voltage between T C leads You can connect all T C types directly to the MLS Watlow Anafaze provides J K T R S and B type linearization...

Page 53: ...e platinum assembly as shown in the next figure Watlow Anafaze highly recommends that you use the three wire RTD to prevent reading errors due to cable resistance If you order an RTD1 RTD2 or RTD3 con...

Page 54: ...Connect the side of the input to the A terminal The voltage input range is 10 to 60 mV Scale signals larger than 60 mV with a scaling resistor which makes full scale input 60 mV The next figure shows...

Page 55: ...nging Communications Follow these instructions to change the unit s communications between RS 485 and RS 232 1 Unplug any cables connected to the MLS PM 2 If you already installed the MLS PM in a pane...

Page 56: ...mon ground connection to establish the common ground Do not use the common ground connection unless the common mode voltage between stations at your installation exceeds the RS 485 specification of 7...

Page 57: ...vers for digital multi point systems Watlow Anafaze equipment meets RS 485 and RS 422 standards However RS 485 does not specify transmission lines signaling rates protocols etc Watlow Anafaze recommen...

Page 58: ...ximum distances and wire gauges for communications wiring You may wish to use a shield depending on your noise environment and grounding problems These cables are shielded Distance Wire Gauge Recommen...

Page 59: ...46 MLS User s Guide Installation...

Page 60: ...uide The next figure shows a map of the operator menus and displays accessible from the MLS Controller s front panel You don t need to enter a passkey sequence to reach these menus To make detailed ch...

Page 61: ...shows the MLS front panel Ramp Soak Not available at this time Alarm Ack Acknowledges Enter Stores data or menu choices advances to the next menu Starts scanning mode if pressed twice Back Aborts edit...

Page 62: ...choice when editing Stop scanning mode Perform a manual controller No Key reset see next page WARNING A manual controller No Key reset clears the con troller s RAM and reinitializes the MLS PM s fact...

Page 63: ...ey to change the loop setpoint Press the Man Auto key to Toggle a loop between manual and automatic control Adjust the output power level of manual loops Automatically tune the loop Ramp Soak isn t av...

Page 64: ...s to Single Loop display and shows an alarm code Symbol Symbol s Meaning Loop is in low process or low deviation alarm Loop is in high process or high deviation alarm Loop is above setpoint If you ena...

Page 65: ...indicator shows HEAT or COOL if the loop is in automatic control and MAN or TUNE if the loop is in manual control BarGraph DisplaySy mbol Single Loop DisplaySy mbol Description M MAN One or both outpu...

Page 66: ...m occurs the alarm interrupts any other display and switches to the alarm display as shown in the next figure If the MLS is in Bar Graph display it switches to Bar Graph Alarm display If it is in Sing...

Page 67: ...larms to clear the global alarm digital output The keyboard and display won t work for anything else until you acknowledge each alarm The alarm symbols are displayed as long as the alarm condition is...

Page 68: ...Job display shows you the following screen If you remotely loaded the job Job display looks like this If you modify a job s parameters while the job is running you ll see this job message If an alarm...

Page 69: ...you set the output mode to Manual you need to set the output level If you set the output mode to Tune you can tune the PID parameters If the Loop is in Manual Mode Press Yes to toggle the mode Press N...

Page 70: ...level menu will only be present if the cool output for the current loop is enabled see Outputs Enabled Disabled in Chapter 4 Setup You should see a display like this Press Yes to change the output pow...

Page 71: ...the controller is at 100 output or at the output limit you set The controller has not calculated PID constants after 10 minutes due to heater failure sensor failure etc If the autotune function aborts...

Page 72: ...s NOTE For your protection MLS reverts to Single Loop Dis play If you don t make any changes for three minutes How to edit a menu Press Yes to select this menu or No to advance to the next menu press...

Page 73: ...output type Heat output cycle time TP SDAC menus SDAC Heat output action Heat output limit Heat output limit time Sensor fail Ht output Outputs heat NLO Cool control out Cool output type Cool output...

Page 74: ...Global Parameters Save setup to job 1 Load setup from job 1 Job control digital inputs NONE Job digital input true LOW Output override dig input NONE Override dig in active LOW Startup alarm delay 0...

Page 75: ...r job 1 The following parameters are loaded as part of a job 1 PID constants filter settings setpoints and spread values 2 Loop control status Automatic or Manual and output values If the loop is in M...

Page 76: ...controls the number of jobs you can select remotely The menu looks like this Selectable values 1 2 3 or NONE Below is the truth table that tells you which input states select which jobs You can choos...

Page 77: ...et in the Setup Loop Outputs main menu Selectable values Input number 1 8 or NONE WARNING ANAFAZE recommends that you install additional external safety devices or over temperature devices for emergen...

Page 78: ...ct If you want to use these functions turn off the Keyboard Lock Selectable values On or Off Power Up Output Status Use this menu to set the initial power up state of the control outputs to Off or Mem...

Page 79: ...in the ANAFAZE communications protocol to Block Check Character BCC or to Cyclic Redundancy Check CRC CRC is a more secure error checking algorithm than BCC but it requires more calculation time and...

Page 80: ...z This function is provided for international users who require 50 Hz lines Since the controller reduces the effect of power line noise on the analog measurement by integrating the signal over the per...

Page 81: ...bal alarm will activate if there is an AIM communications failure and will reset automatically when the problem is corrected The controller will revert to manual mode during an AIM communications fail...

Page 82: ...the menu tree for the Setup Loop Inputs menu Notice the default values inside the boxes LOOP PROCESS UNITS ALARM SETPOINT STATUS OUT SETUP LOOP 02 INPUT Setup Loop Inputs Input Type J T C Linear Pulse...

Page 83: ...how loops you ve set to Skip The next table shows the MLS input types and ranges Input Type Fahrenheit Range Celsius Range J 350 to 1400 212 to 760 K 450 to 2500 268 to 1371 T 450 to 750 268 to 399 S...

Page 84: ...to name your loop You can choose any two characters from the set of characters used for the input units See table below Input Units Use this menu to choose a three character description of the loop s...

Page 85: ...e Input Reading Offset menu Linear Scaling Menus The linear scaling menus appear under the Setup Loop Inputs main menu and they are available for Linear and Pulse inputs only It lets you scale the raw...

Page 86: ...isplay format that matches the range and resolution of the process variable The display format you choose is used for the setpoint alarms deadband spread and proportional band The PV Process Variable...

Page 87: ...s value The high process value and the high reading value together define one of the points on the linear scaling function s conversion line Selectable values See table above Display Formats High PV D...

Page 88: ...ine one of the points on the linear scaling function s conversion line Selectable values See table on previous page Low Reading Use this menu to enter the input level that corresponds to the low proce...

Page 89: ...later readings are also outside the acceptance band the MLS accepts the anomalous reading and calculates a new acceptance band This input filter does not require adjustment A standard resistor capaci...

Page 90: ...one of each menu is explained in the text The controller shows both heat and cool menus even if the heat or cool output is disabled See Setup Loop Out puts for help in enabling or disabling the heat o...

Page 91: ...lates the default PB for each input type according to the following equation Heat Cool Control TI Use this menu to set the Integral term or Reset Selectable range 0 6000 seconds Heat Cool Control TD U...

Page 92: ...table range 0 255 Setting the output filter to 0 turns it off Heat Cool Spread Use this menu to set the spread between the heat and cool output and the spread of the On Off control action Selectable r...

Page 93: ...C outputs Control action Output level limit and limit time Output override Nonlinear output curve Both heat and cool outputs have the same menus so only one of each menu is explained in this section T...

Page 94: ...ol output type For SDAC outputs For TP outputs Heat cool output cycle time 10 S SDAC mode Voltage SDAC Lo value 0 00 SDAC Hi value 10 00 VDC For ON OFF DZC Heat Cool output action Reverse Heat Cool ou...

Page 95: ...ype Use this menu to set the output type The next table shows the available output types For an expanded description of these output types see Tuning and Control Display Code Output Type Definition TP...

Page 96: ...the SDAC using the following series of menus The MLS will also assign digital output 34 as a clock line for the SDAC You won t be able to assign another function to output 34 while any loop s output i...

Page 97: ...nstance if the output device has a 0 00 10 00 Vdc range set the SDAC high value to 10 00 Vdc and the SDAC low value to 0 00 Vdc The controller converts 0 output to a 0 00 Vdc signal and 100 output to...

Page 98: ...menu to set a time limit for the output limit Selectable values 1 999 seconds or CONT continuous Heat Cool Output Override Use this menu to set an output override percentage You can configure a digit...

Page 99: ...rocesses Selectable values Curve 1 Curve 2 or Off linear no curve The linear curves are shown in the figure below Calculated by PID LOOP PROCESS UNITS ALARM SETPOINT STATUS OUT 03 OUTPUTS HEAT NLO OFF...

Page 100: ...boxes LOOP PROCESS UNITS ALARM SETPOINT STATUS OUT SETUP LOOP 04 ALARMS Setup Loop Alarms High process alarm setpoint 1000 F High process alarm type OFF High process alarm dig out NONE Deviation alarm...

Page 101: ...ASOFT to acknowledge it Process Alarms Process alarms include high and low deviation and high and low process alarms You can set each of these alarms to Off Alarm or Control as shown here High process...

Page 102: ...alarm type setpoint and digital output High and low deviation alarm type deviation alarm value and alarm digital output Alarm deadband Loop alarm delay The setpoints deviation alarm values and deadba...

Page 103: ...ot failed sensor alarms for all loops for a time period you set in the Setup Global Parameters main menu The loop alarm delay delays failed sensor alarms and process alarms for one loop until the alar...

Page 104: ...ntrol function Selectable values Alarm Control Off High Process Alarm Output Number Use this menu to choose the digital output that activates when the loop is in high process alarm You can use this ou...

Page 105: ...r example a high deviation alarm turns on a fan and a low deviation alarm turns on a heater Selectable values You can set a value from 0 to 255 25 5 2 55 255 or 0255 depending on how you set up the in...

Page 106: ...it isn t used for control or the SDAC clock You may also select NONE Low Deviation Alarm Type Use this menu to turn Off the low deviation alarm or set it to Alarm or Control mode Selectable values Ala...

Page 107: ...electable range Any value within the input sensor s range Low Process Alarm Type Use this menu to turn off the low process alarm or set it to the Alarm or Control function Selectable values Alarm Cont...

Page 108: ...menu to set a loop alarm delay There are two types of alarm delay the startup alarm delay and loop alarm delay Startup alarm delay which you can set in the Setup Global Parameters main menu delays pro...

Page 109: ...inputs digital outputs and the MLS keypad The next figure shows the I O Test menu tree Notice the default values inside the boxes LOOP PROCESS UNITS ALARM SETPOINT STATUS OUT MANUAL I O TEST Manual I...

Page 110: ...g to controller common When you do that the input s state should change to L Press Yes or No to advance to the next menu Press Back to return to the Manual I O test main menu Keypad Test Use this menu...

Page 111: ...it You select the output to test in the previous menu On may be Low or High depending on the digital output polarity you set in the Output Polarity menu All outputs are set to Off when you exit Manual...

Page 112: ...and Proportional with Integral and Derivative PID P PI or PID control are necessary when process variable PV cycling is unacceptable or if the process or setpoint SP is variable NOTE For any of these...

Page 113: ...s distance from the setpoint The limits of proportional control are defined by the Proportional Band PB outside this band of control the output is either 100 or 0 For example using the same values fro...

Page 114: ...integral control Proportional Integral and Derivative Control For an improved level of control use Derivative control with Proportional or Proportional and Integral control Derivative control also ca...

Page 115: ...ortioning output However for each AC line cycle the controller decides whether the power should be On or Off There is no Cycle Time since the decision is made for each line cycle Since the time period...

Page 116: ...D control Some processes are very sensitive and require a high PB so normal control methods are ineffective You can use a smaller PB and get better control if you use the digital filter to reduce the...

Page 117: ...tings This table shows PB settings for several setpoints Setting the PB a General Rule Set the PB to 10 of the setpoint below 1000 and 5 of the setpoint above 1000 This setting is useful as a starting...

Page 118: ...table shows Derivative term TD vs Rate Minutes RM Rate TD 60 Setting the TD A General Rule Set the TD to 15 of TI as a starting value TI secs repeat Reset repeats min TI secs repeat0 Reset repeats min...

Page 119: ...he TI Example TI 60 so TD 9 Set the Output Filter to 2 PB TI TD FIL OUTPUT CT Action Electric heat with solid state relays 50 60 15 4 TP 3 Reverse Electric heat with mechani cal relays 50 60 15 6 TP 2...

Page 120: ...Tuning and Control MLS User s Guide 107...

Page 121: ...108 MLS User s Guide Tuning and Control...

Page 122: ...oller If the controller wasn t installed correctly for instance if you have shorted sensor inputs to high voltage lines or a transformer is shorted out and you replace the MLS with a spare unit the sp...

Page 123: ...your equipment and return it to you as soon as possible Try to figure out if the problem is in the MLS PM or the MLS AIM and send only that part for repair Troubleshooting Stand Alone Systems The MLS...

Page 124: ...S PM does not agree with the number of inputs in the MLS AIM perform a manual controller reset with the AIM connected to the processor module If the numbers still don t agree check the following Make...

Page 125: ...to check to Manual mode Set the output power percentage to the desired level Set the output type to On Off or TP see Chapter 4 Setup Testing Control Output Devices To test a control output device lik...

Page 126: ...SOFT tells you that your computer is not functioning contact your computer service representative Check your ANAINSTL program to make sure that ANASOFT and the MLS are set for the same serial communic...

Page 127: ...85 selection jumper must be set to the correct position From the setup menus make sure that the communications parameters address error checking and baud rate are set correctly for each MLS in your sy...

Page 128: ...write you can use this program to test your communications ANASOFT If ANASOFT is not working check these things first ANAINSTL the ANASOFT installation program has the cor rect path for the program an...

Page 129: ...ll controller parameters back to their default values so you must reenter the desired values from ANA SOFT or from the controller s front panel after you change the EPROM 1 Power down the controller B...

Page 130: ...ket The next figure shows the EPROM and the RAM chip 6 Remove the existing EPROM from its socket by prying it out with a small flathead screwdriver as shown below 7 Carefully bend the legs of the new...

Page 131: ...118 MLS User s Guide Troubleshooting...

Page 132: ...resistor scaling network to produce 60 millivolts at 20 mA See the Inputs section of Chapter 2 Installation for more information on scaling networks The sensor measures PSI in tenths so the appropriat...

Page 133: ...r minute Setup The sensor is connected to a loop input set up with a resistor voltage divider network to produce 60 millivolts at 5 volts See the Inputs section of the Installation chapter for informa...

Page 134: ...e values Ambient Temperature The temperature of the air or other medium that surrounds the components of a thermal system American Wire Gauge AWG A standard of the dimensional characteristics of wire...

Page 135: ...ctrical noise with relation to ground from a common voltage Usually expressed in decibels dB Communications The use of digital computer messages to link components See Serial Communications See Baud R...

Page 136: ...ct Action An output control action in which an increase in the process variable causes an increase in the output Cooling applications usually use direct action Direct Current DC An electric current th...

Page 137: ...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 Digital Outpu...

Page 138: ...Display LCD A type of digital display made of a material that changes reflectance or transmittance when an electrical field is applied to it Load The electrical demand of a process expressed in power...

Page 139: ...stributed Zero Crossing SDAC or Analog Also the description of the electrical hardware that makes up the output Overshoot The amount by which a process variable exceeds the setpoint before it stabiliz...

Page 140: ...rature characteristic to measure temperature There are two basic types of RTDs the wire RTD which is usually made of platinum and the thermistor which is made of a semiconductor material The wire RTD...

Page 141: ...erial that exhibits a large change in resistance for a small change in temperature Thermistors usually have negative temperature coefficients although they are also available with positive temperature...

Page 142: ...h or pressure behind current flow through a circuit One volt V is the difference in potential required to move one cou lomb of charge between two points in a circuit consuming one joule of energy In o...

Page 143: ...Glossary MLS User s Guide 130...

Page 144: ...service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE IN...

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