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Watlow Controls 8LS, User Manual

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66 8LS User’s Guide

Setup         

Heat Output

Use this menu to select the Terminal Block or the Flat Ribbon for the
heat output termination. The heat output is usually defaulted to the
screw terminals of TB2, while the cool output is on the 50 pin flat
ribbon connections of P10. However, you can switch the outputs, so
heat is switched to the flat ribbon output, and cool--to the screw
terminals of TB2.

Selectable values:

 Term Blk or Flat Rib.

NOTE

The analog output is not available on the ribbon
cable, and the DZC is not available on the screw
terminals.

1

2

3

4

5

6

7

8

LOOP

PROCESS

UNITS

ALARM

SETPOINT

STATUS OUTPUT%

1 HT    OUT?

TERM  BLK

Summary of Contents for 8LS

Page 1: ...No 10585 00 Revision 9 2 July 1996 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 wint...

Page 2: ...of 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 C...

Page 3: ...tallation 10 Mounting The 8LS 11 External Wiring 13 General Wiring Requirements 13 Cable Recommendations 15 Noise Suppression 16 Terminal Block And Connector Layout 18 RTB Connections 19 Analog Inputs...

Page 4: ...t Panel 37 Front Panel Keys 38 Displays 40 Bar Graph Display 40 Single Loop Display 41 Scanning Display 41 Alarm Display 41 Operator Menus 43 Changing the Setpoint 43 Selecting Status Mode 43 Autotune...

Page 5: ...t 66 Setup Alarms 67 Alarm Types 68 High Process Alarm Setpoint 69 High Process Alarm Status 69 High Process Alarm Output Number 69 Deviation Band Alarm 70 Deviation Band Alarm Status 70 High Deviatio...

Page 6: ...hoosing a Profile to Edit 91 Copying the Setup from Another Profile 92 Editing the Tolerance Alarm Time 92 Editing the Ready Setpoint 93 Editing the Ready Event States 93 Choosing an External Reset In...

Page 7: ...ecommended CP Trim Gas Alarm for Batch Applications110 Carbon Probe 111 General Guidelines 111 Probe Burn Off 112 Carbon Probe Burn Off Requirements 112 Burn Off Procedures 112 Burn Off Function 113 S...

Page 8: ...vi 8LS User s Guide...

Page 9: ...duction Gives a general description of the 8LS and its related specifications Installation Describes how to install the 8LS Using the 8LS Provides an overview of system displays and opera tor menus Se...

Page 10: ...s 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 8LS components are missing or damaged Parts List 8LS c...

Page 11: ...rd exists could result in damage to equipment and property and injury to personnel The 8LS includes a reset circuit that sets the control outputs off or to the data stored in memory if the microproces...

Page 12: ...4 8LS User s Guide Overview...

Page 13: ...ected as digital for on off time proportioning or as analog for proportional 0 5vdc 4 20madc The PID secondary output can be selected as digital for on off time proportioning or distributed zero cross...

Page 14: ...et of control constants for heating and cooling applications Optional Ramp and Soak The 8LS is available with a built in powerful Ramp and Soak programmer for batch processing Optional Extruder or Car...

Page 15: ...on 60 db at 60 Hz full scale range maximum Loop update time 2 times per second every input T C burnout Full upscale reading of input standard DC milliamp inputs 4 20 mA 10 50 mA 0 50 mA etc with scali...

Page 16: ...le 0 to 5 Vdc at 20 mA maximum or 4 to 20 mAdc 500 ohm maximum load Output resolution 12 bits Number 31 Configuration 1 Global Alarm terminals 30 for alarms or events 1 4 terminals 5 30 RTB connector...

Page 17: ...nically proficient and they seem simple at least skim all of the instructions so you don t miss anything vital These symbols are used throughout this manual DANGER This symbol warns you of a hazard to...

Page 18: ...ring installation and wiring place temporary covers over the housing slots and the rear of the 8LS so dirt and pieces of wire don t fall through the slots When you are finished with installation remov...

Page 19: ...ed from thermal shocks whenever possible This will minimize any temperature gradients across the terminal strips and ensure the highest accuracy 1 Use the dimensions below to cut a hole in the panel C...

Page 20: ...6 7 8 LOOP PROCESS UNITS ALARM SETPOINT STATUS OUTPUT YES NO BACK ENTER ALARM ACK CHNG SP MAN AUTO RAMP SOAK Front 3 78 96 mm 3 78 96 mm 3 58 90 9 mm 3 58 90 9 mm PIO TB2 TB3 TB1 TB4 Rear 3 78 96 mm...

Page 21: ...lectrical problems that may occur The function of the wire is divided into two basic categories Inputs and Outputs The process control requirements will dictate the type of inputs and the outputs alon...

Page 22: ...uracy and source impedance 5 Use multiconductor stranded shielded cable for analog inputs Most inputs will use a shielded twisted pair but some may require a 3 wire input Run all analog input wiring i...

Page 23: ...eparate panel Cable Recommendations Use these cables or their equivalent Function MFR P N of Wires AWG Analog Inputs Belden 9154 Belden 8451 2 2 20 22 RTD Inputs Belden 8772 Belden 9770 3 3 20 22 T C...

Page 24: ...he 120 vac power leads from the low level input and out puts leads from the Watlow Anafaze Do not run the digital outputs or PID control outputs leads in the same wire bundle as any 120 vac wires Inpu...

Page 25: ...ight be present with using E M relays If problems persists and or any questions about the above steps arises please call Watlow Anafaze Technical Service Department at 408 724 3800 L 1 120 VAC L 2 MOV...

Page 26: ...3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 PID 1 Out PID 3 Out PID 4 Out PID 6 Out PID 7 Out Pulse In Dig In 12 Dig Out 1 Dig Out 2 Dig Out 3 Dig Out 4 Global Logic COM PID 2 Out Logic...

Page 27: ...minal Function 1 5 Vdc 2 5 Vdc 3 Logic COM 4 Logic COM 5 Spare 6 Spare 7 Spare 8 Spare 9 PID 1 Out 10 Dig 30 Out 11 PID 2 Out 12 Dig 29 Out 13 PID 3 Out 14 Dig 28 Out 15 PID 4 Out 16 Dig 27 Out 17 PID...

Page 28: ...by large currents flowing in the ground path between the 8LS and the sensors Use isolated sensors or ungrounded thermocouples and locate the 8LS as close as possible to the sensors in order to minimiz...

Page 29: ...e connection of current inputs such as 4 to 20ma voltage inputs and 3 Wire RTD Watlow Anafaze will supply input scaling as needed order option 8LS SI XX The input circuit is shown below Ana In Analog...

Page 30: ...esistor goes vertically into the hole with the white silk screen The lead on the top then goes into the adjacent indicated hole The resistor positions are highlighted RC1 RB1 RC2 RB2 RC3 RB3 RC4 RB4 R...

Page 31: ...ay be corrected by using the built in linear scaling Remove the jumper in the RA location to install RA Milliamp Inputs Current inputs from transmitters are accommodated by placing resistors in the in...

Page 32: ...afaze as a fully integrated system with the 8LS configured to provide power for up to four IRSM modules and for direct connection of the IRSM output The following connections are required if the IRSM...

Page 33: ...to 20 seconds To enable the pulse input select PLS for the input type of the loop that is to be used for the pulse input Do not use the analog input terminals Connect the transducers output using shi...

Page 34: ...e connection of the carbon probe to the 8LS An equivalent cable may be used Probe Cable Belden 88760 Connect Shield to TB4 6 Chassis Ground No of CP Loops T C input Loop Number Carbon Probe Input Loop...

Page 35: ...d on the terminal block instead of the 50 pin ribbon cable This is because many applications use only one output and a user will not have to buy a remote terminal block to use the primary output Also...

Page 36: ...The primary PID positive output for each loop is located on the screw terminal blocks and labeled Ctl Out 1 through Ctl Out 8 The negative side of the output is Logic Ground NOTE Primary control outp...

Page 37: ...ssible from the top of the electronics assembly after it has been removed from the housing There are two dip switch packages on the Output Card each with 8 switches Each channel requires two switches...

Page 38: ...l features are set to Off Analog Output Dip Switch Setting for 0 5v 4 20mA O indicates an On switch F indicates an Off switch Loop Switch Position 0 5 Vdc 4 20 mA 1 Rear 1 O F 1 Rear 2 F O 3 Rear 3 O...

Page 39: ...t DIP switch position 1 ON 3 Turn on power for 10 seconds and then turn it off 4 Set DIP switch position 1 OFF 5 Turn on power Positions 2 to 8 are not used for normal 8LS operations All positions mus...

Page 40: ...32 8LS User s Guide Installation Connections are made as follows SSR 1 SSR 2 Remote Terminal Block Or Ribbon Cable Pin 9 11 1 PID Ctl Out 1 PID Ctl Out 2 5Vdc Supply...

Page 41: ...osest to the front panel while RS 485 is on the 4 pins nearest to the rear panel The connector is always installed with the red lead nearest the front panel The jumper plug is located near the cable c...

Page 42: ...w the maximum signaling rate covered by the specification satisfactory performance may be expected without strict adherence to all of the design rules Watlow Anafaze has presented conservative recomme...

Page 43: ...Thus a common connection is required between all stations on the communication line This can be accomplished by either a 5th wire which could be shield or a common ground connection The Watlow Anafaze...

Page 44: ...for RS 485 communications is recommended for noisy environment NOTE Connect the cable shields to equipment ground only at the 8LS controller sites Do not connect the shield at the computer site to Gr...

Page 45: ...8 LOOP PROCESS UNITS ALARM SETPOINT STATUS OUTPUT YES NO BACK ENTER ALARM ACK CHNG SP MAN AUTO RAMP SOAK Yes Select a menu Answer Yes to Yes No prompts Increase a number or choice Alarm Ack Acknowled...

Page 46: ...kip a menu when prompt is blinking Answer No to Yes No prompts Decrease a number or choice you are editing Press Back to Abort editing Return to a previous menu Press Enter to Store data or menu choic...

Page 47: ...status between Manual and Auto Adjust output power level of loops in Manual mode Press Ramp Soak to Assign a Ramp Soak profile to selected loop Perform operations on profile you have assigned NOTE If...

Page 48: ...ediate levels are linearly spaced between the upper and lower limits The lower display shows each loop s status The table below shows the loop status symbols Loop Status Symbol Description Loop Functi...

Page 49: ...de the controller will automatically step through the active channels showing the Single Loop display for each for about a second Press any arrow key to return to the Single Loop display Alarm Display...

Page 50: ...nterrupts any system display If more than one alarm is present the first one is shown When you press the Alarm Ack key the flashing stops but the alarm indicator remains as long as the alarm condition...

Page 51: ...ngle Loop display Press No or Back to return to Single Loop display without saving the new setpoint Selecting Status Mode Press Man Auto from the loop you want to change This display appears Press No...

Page 52: ...l 100 output The autotune function then calculates the appropriate PID constants for the loop and puts the loop in automatic control with the calculated PID values The Autotune function will abort if...

Page 53: ...equence Enter Alarm Ack and Chng SP 3 The first Setup menu appears How to edit a menu Press Yes to select this menu or No to advance to the next menu When you select a menu the blinking question mark...

Page 54: ...Control TD Control FIL Control spr Outputs Typ Outputs CT Outputs Act Outputs Lim Outputs Ltm Outputs NLO out Alarms HP Hi pro outpn Alarms Dev Hi dev Outpn Lo dev Outpn Alarms LP Lo pro Outpn Alarms...

Page 55: ...Below is the setup global parameters menu tree Notice the default values inside the boxes 1 2 3 4 5 6 7 8 LOOP PROCESS UNITS ALARM SETPOINT STATUS OUTPUT SETUP GLOBALS Setup Globals Save as Job 1 Res...

Page 56: ...Set Alarm Delay Use this menu to set a startup delay for all system alarms Alarm checking will be delayed for the number of minutes you enter This is used to avoid nuisance alarms when starting up a s...

Page 57: ...keys Chng SP Man Auto and Ramp Soak Selectable values On or Off Power Up Output Status Use this menu to configure the initial power up state of the control outputs If you choose Off all control outpu...

Page 58: ...r and assign each subsequent controller the next higher address Selectable range 1 to 32 Communication Error Checking Use this menu to set the data check algorithm used in the Watlow Anafaze communica...

Page 59: ...B Allen Bradley AC Line Frequency Use this menu to configure the controller to match the AC line frequency Since the controller reduces the effect of normal mode noise by integrating the signal over...

Page 60: ...52 8LS User s Guide Setup EPROM Version Use this menu to see the controller s EPROM version and checksum 1 2 3 4 5 6 7 8 LOOP PROCESS UNITS ALARM SETPOINT STATUS OUTPUT 8LS RS V3 20...

Page 61: ...like this Answering Yes to this prompt gets you into the Inputs submenus Below is the setup inputs menu tree Notice the default values inside the boxes 1 2 3 4 5 6 7 8 LOOP PROCESS UNITS ALARM SETPOIN...

Page 62: ...w for the input types and ranges available for the 8LS he is editing Character editing proceeds left to right one character at a time Input Type Fahrenheit Range Celsius Range J 350 to 1400 212 to 760...

Page 63: ...nits Use this menu to choose a description for the loop s engineering units Selectable range The table below shows the character set for input units When entering three character description for Linea...

Page 64: ...ll scale is best After these entries the process variable the setpoint and alarms will all be in engineering units High PV Display Selectable range 0 9999 High RDG Display Selectable range 0 9999 The...

Page 65: ...The 4 20mA is converted to 12 60mV How will you set the input scaling Solution 1 Set the High PV to 400 and enter the units as P S and I 2 Calculate the High RDG and enter it 3 Set the Low PV to 100 a...

Page 66: ...res below 400 F a type J thermocouple may be inaccurate offset by several degrees To correct for offset errors change the factory default setting to a positive or negative value for the loop you are e...

Page 67: ...tree Notice the default values inside the boxes NOTE If you set the Cool output PB to Off the loop becomes a single output channel and will no longer function as a heat cool loop Further programming o...

Page 68: ...or cool output s response The output responds to a step change by going to approximately 2 3 of its final value within the number of scans you set here Selectable range 0 255 1 2 3 4 5 6 7 8 LOOP PRO...

Page 69: ...pread Use this menu to set the spread between the heat and cool output and the spread of the On Off control action Selectable range 0 255 engineering units 1 2 3 4 5 6 7 8 LOOP PROCESS UNITS ALARM SET...

Page 70: ...nel is operating as a single output loop all prompts for the Cool output data are sup pressed When the last Heat output var iable is programmed the display returns to the Setup Out puts prompt 1 2 3 4...

Page 71: ...verted to a percent duty cycle over the pro grammed cycle time DZC Distributed Zero Cross ing Available only on secondary 50 pin Ribbon output Output On Off state calcu lated for every AC line cycle O...

Page 72: ...ower up the controller The time period is adjustable from 1 to 999 seconds for a maximum period of time of over 16 minutes A time of 0 seconds will be displayed as C the same as for Continuous The out...

Page 73: ...utput Curve Use this menu to select one of two nonlinear output curves for nonlinear processes Selectable values 1 curve 1 2 curve 2 or Off linear no curve The linear curves are shown below 1 2 3 4 5...

Page 74: ...ol output is on the 50 pin flat ribbon connections of P10 However you can switch the outputs so heat is switched to the flat ribbon output and cool to the screw terminals of TB2 Selectable values Term...

Page 75: ...rms main menu looks like this Answering Yes to this prompt gets you into the Alarms submenus Below is the setup alarms menu tree Notice the default values inside the boxes 1 2 3 4 5 6 7 8 LOOP PROCESS...

Page 76: ...ital output for PID control you can assign it to one or more process variable alarms The output is active if any of its alarms are active All alarm outputs are active Low or active High depending on t...

Page 77: ...values Any point within the scaled sensor range High Process Alarm Status Use this menu to enable or disable the high process alarm Selectable values On Off High Process Alarm Output Number Use this m...

Page 78: ...viation alarm status You can enable or disable the alarm function Selectable values On Off High Deviation Alarm Output Number Use this menu to assign a digital output which activates when the loop is...

Page 79: ...ow the low process alarm setpoint It deactivates when the PV goes above the low process alarm setpoint plus the deadband Selectable values Any value within the input sensor s range Low Process Alarm S...

Page 80: ...eated alarms as the PV cycles slightly around an alarm value Selectable values 0 255 Alarm Delay Use this menu to set a loop alarm delay This delay is set seperately for each loop It delays failed sen...

Page 81: ...u tree Notice the default values in the boxes Digital Input Testing Use this view only menu to see the logic state of the 12 digital inputs as 1 s High or 0 s Low the menu displays inputs 1 through 12...

Page 82: ...Output Test Use this menu to toggle the state of a digital output between On and Off Selectable values On Off NOTE Before leaving this menu turn Off all the outputs you have turned On 1 2 3 4 5 6 7 8...

Page 83: ...mode dictates how the controller responds to an input signal The control mode is different from the type of control output signal like analog or pulsed DC voltage There are several control modes avail...

Page 84: ...e process goes above 1000 F The next diagram shows a process under On Off control Proportional Control A process using On Off control frequently cycles around the setpoint When process variable cyclin...

Page 85: ...rtional control only Proportional and Integral Control For Proportional and Integral control use the Integral term or Reset with Proportional control The Integral term corrects for offset by repeating...

Page 86: ...gital output signal for PID control outputs These outputs normally control the process using relays Digital Output Control Forms The next section explains different modes for control outputs On Off On...

Page 87: ...lter digitally filters the PID control output signal It has a range of 0 255 levels which gives a time constant of 0 127 5 seconds Use the output filter if you need to filter out erratic output swings...

Page 88: ...shows PB settings for various temperatures in degrees F As 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 value Tempe...

Page 89: ...shows Derivative term TD versus Rate Minutes RM Rate TD 60 As a general rule set the TD to 15 of TI as a starting value TI secs repeat Reset repeats min TI secs repeat Reset repeats min 30 2 0 210 0...

Page 90: ...PB 45 Set the TI to 60 Set the TD to 15 of the TI Example TI 60 so TD 9 Set the Output Filter to 2 The next table shows general PID constants by application Application PB TI TD Filter Output Type Cyc...

Page 91: ...Tuning and Control 8LS User s Guide 83...

Page 92: ...84 8LS User s Guide Tuning and Control...

Page 93: ...store and enter these values using a standard IBM PC or compatible computer and ANASOFT software Checking Control Outputs To check control outputs 1 Set the loop you want to check to Manual mode 2 Se...

Page 94: ...y have the default address 1 If the address must be changed while the system is up and on line ANASOFT will indicate communication errors as it will probably get responses from two controllers at once...

Page 95: ...ere with ANA SOFT 5 The software key is properly installed on the printer port It should be plugged into the printer port with the female end toward the computer and the male end toward the printer Do...

Page 96: ...88 8LS User s Guide Troubleshooting...

Page 97: ...two triggers At least one must be true before the segment can start While the input is not true the profile waits this wait state is called trigger wait You can use any one of the eight digital input...

Page 98: ...possible inputs for triggers 8 Number of events per segment 4 Number of possible outputs for events At least one of these outputs must be used for control 30 Setup R S profiles Edit R S profile Copy...

Page 99: ...rofile main menu This menu is located between the Setup Loop Alarms main menu and the Manual I O Test main menu Answering Yes to this prompt allows you to setup or edit R S profiles Choosing a Profile...

Page 100: ...egment timer holds The loop s single loop display shows TOHO Tolerance Hold When the segment has been out of tolerance for more than the tolerance alarm time The controller goes into tolerance alarm T...

Page 101: ...ready state for all outputs that are not used for control When you assign a profile the controller starts the ready segment it goes to the ready setpoint and puts all the outputs in the ready state yo...

Page 102: ...20 The first time you use this menu it defaults to segment 1 when you have finished editing a segment the controller returns you to this menu and goes to the next segment This loop continues until yo...

Page 103: ...O Starting a segment with an event If you want a segment to start with an event usually events happen at the end of the segment program the previous segment for the event You can also use this trick 1...

Page 104: ...ow or On High Editing Segment Triggers Each segment has two triggers digital inputs One of these triggers must be true before the segment can begin If a segment times out and at least one of the next...

Page 105: ...ff This menu appears only if you answered YES to the Edit Segment triggers menu Selectable Values Off or On Latching or Unlatching a Trigger Use this menu to make a trigger latched or unlatched A latc...

Page 106: ...nce Selectable Values 99 to 99 or Off no tolerance Ending a Profile Use this menu to make a segment the last one in the profile Selectable Values No or Yes Repeating a Profile Use this menu to set the...

Page 107: ...the Ramp Soak Reset display Press NO to return to Single Loop display Press BACK to return to the Time Remaining display Assigning a profile to a loop Use this menu to assign a profile to a loop Sele...

Page 108: ...ofile menu 3 Press YES then ENTER to reset the profile You will see the Assign Profile menu See previous page 4 Choose one of the available profiles and press ENTER 5 Press BACK if you wish to return...

Page 109: ...Ramp Soak Displays The Single loop and Bar Graph displays show additional codes for R S controllers Single loop display When the controller is running a profile the Single Loop display shows the prof...

Page 110: ...cled All the menus you can reach from the RAMP SOAK key have the same information on the top line How long has the profile run From Single Loop display press the RAMP SOAK key once The next menu appea...

Page 111: ...old follow these steps Press RAMP SOAK key repeatedly until you see the R S mode menu While the profile is running the only mode you will be able select is Hold Press YES to hold the profile and then...

Page 112: ...u reset a profile the following happens The profile returns to the ready segment The PV goes to the ready setpoint and the ready segment events go to the state you specified in the Edit Ready Event St...

Page 113: ...thermocouple is standard Loops that are not used for carbon input may be used as standard inputs for PID control and recording of other process parameters such as temperature zones Key Features Select...

Page 114: ...ber Loop Loop Function 8LS CP 1 1 2 3 4 5 6 8 7 Ref T C for loop 2 probe temp Carbon Probe input Standard PID loops Recording analog process signal representing the PV of loop 2 8LS CP 2 1 2 3 4 5 6 7...

Page 115: ...re control Furn heat control Loop 1 or 3 PID primary output Reverse Action TP or analog Gas valve Atmosphere Control Loop 2 PID primary output Reverse action TP or analog SSR Relay N C Air valve Atmos...

Page 116: ...00 Control Capability CP PID Control T C Loop has standard PID control Carbon Probe Loop PID control is reference to T C Loop output is available for control when T C Loop is between 1400 to 2400 F CP...

Page 117: ...CP loop as one of the 1 30 digital outputs available It will be On when the temperature of the T C Reference Loop is between 1400 to 2400 F Below or above these limits the CP gas alarm output is Off...

Page 118: ...t limit warning of the carbonizing gas control system Recommended CP Trim Gas Alarm for Batch Applications When using the 8LS CP for controlling the gas atmosphere in a batch furnace it is required to...

Page 119: ...stall probes in new or rebricked furnaces until they have been dried out for at least 8 hours at 1700 F with a reducing atmo sphere The use of the Zirconia probe in carburizing applications is trouble...

Page 120: ...to the misreading of the CP probe during burn off 7 The level of the PID control signal must be maintained following the burn off cycle to allow the probe to recover before automatic control is restor...

Page 121: ...rn off period timer range is 1 45 minutes While in the burn off function the Time mode selection for a continuous furnace or Input mode for a batch furnace will determine the control action of the PID...

Page 122: ...the temperature falls at least 100 F below the selectable limit Setup Menus This section describes the additional editing parameters for the CP functions Setup Inputs Input Type For the Reference Tem...

Page 123: ...100 Engineering Units The engineering units of the carbon loop can be edited only for the Dewpoint type The engineering units for CP and MV are fixed CP for CP and MV for MV Upon selecting the DP type...

Page 124: ...values may cause incor rect operation of the 8LS CP Setup Carbon Burn Off Use the following menus to edit the carbon burn off function of the 8LS CP Burn Off Start Mode This menu allows you to edit t...

Page 125: ...en the burn off function Selectable Range 1 255 Burn Off start Input This menu is displayed if the start mode is set to Input Use it to edit the digital input number which will initiate the burn off p...

Page 126: ...set Off until the probe temperature is 100 F below the Maximum Allowable Probe Temperature Setpoint When the output is Off the air flow to the probe should stop allowing the probe to cool down Select...

Page 127: ...p and the probe millivolt level In order to display the engineering values of the input both the T C and probe loops must be within limits of the carbon probe variables for correct reading of the prob...

Page 128: ...120 8LS User s Guide Appendix B 8LS CP...

Page 129: ...p with a cascade setpoint The cascade control provides an adjustable range of the Secondary setpoint on a per loop basis The 0 level of the Primary loop control ouput sets the low end of the Secondary...

Page 130: ...e Range The range of the input type selected on the secondary loop Setting the Low End of the Secondary Setpoint Use this menu to set the low end of the secondary loop s setpoint This setting determin...

Page 131: ...edium that surrounds the components of a thermal system American Wire Gauge AWG A standard of the dimensional characteristics of wire used to conduct electrical current or signals AWG is identical to...

Page 132: ...munications See Baud Rate Control Action The response of the PID control output relative to the error between the process variable and the setpoint For reverse action usually heating as the process de...

Page 133: ...re E Earth Ground A metal rod usually copper that provides an electrical path to the earth to prevent or reduce the risk of electrical shock Electrical Noise See Noise Electromagnetic Interference EMI...

Page 134: ...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...

Page 135: ...tion band deadband digital outputs and auxiliary control outputs Low Deviation Alarm Warns that the process is below the setpoint but above the low process variable It can be used as either an alarm o...

Page 136: ...eature that prevents operation of the front panel by unauthorized people PID Proportional Integral Derivative A control mode with three functions Proportional action dampens the system response Integr...

Page 137: ...h is made of a semiconductor material The wire RTD is a positive temperature coefficient sensor only while the thermistor can have either a negative or positive temperature coefficient Reverse Action...

Page 138: ...sing junction and the lead wire connection to the instrument cold junction TI Timed Integral The Integral term Transmitter A device that transmits temperature data from either a thermocouple or RTD by...

Page 139: ...Glossary 8LS User s Guide 131...

Page 140: ...Glossary 132 8LS User s Guide...

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