1. Manuals
  2. Brands
  3. Watlow Controls Manuals
  4. Recording Equipment
  5. 8LS
  6. User manual

Watlow Controls 8LS User Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
8LS
User's Guide
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:
wintechsupport@watlow.com
Part No. 10585-00. Revision 9.2
July 1996

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 8LS and is the answer not in the manual?

Questions and answers

Summary of Contents for Watlow Controls 8LS

  • Page 1 User’s Guide 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: wintechsupport@watlow.com Part No. 10585-00. Revision 9.2 July 1996...
  • Page 2 © Copyright 1996 Watlow Anafaze Information in this manual is subject to change without notice. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form without written permission from Watlow Anafaze. Warranty Watlow Anafaze, Incorporated warrants that the products furnished under this Agreement will be free from defects in material and workmanship for a period of three years from the date of ship- ment.

  • Page 3: Table Of Contents

    Resistor Installation ............22 Voltage Inputs..............23 Milliamp Inputs..............23 Thermocouple Inputs ............23 RTD Inputs ..............24 Infrared Non-contact Temp. Sensors .......24 Pulse Input ...............25 Carbon Probe Input ............25 Control Outputs..............27 PID Output Termination TB (Primary) or Flat Ribbon (Secondary)..........27 8LS User’s Guide i...
  • Page 4 Set Alarm Delay...............48 Set R/S Time Base ............49 Lock Panel ...............49 Power Up Output Status ..........49 Controller Address ............50 Communication Error Checking........50 Communication Baud Rate..........51 Communication Protocol ..........51 AC Line Frequency............51 EPROM Version ..............52 Setup Inputs Menu ..............53 ii 8LS User’s Guide...
  • Page 5 Low Process Alarm Output Number .......72 Alarm Deadband ..............72 Alarm Delay..............72 Test I/O ..................73 Digital Input Testing ............73 Test Output ..............74 Digital Output Test ............74 Tuning and Control Introduction................75 Control Modes ...............76 Control Outputs..............78 Digital Output Control Forms..........78 8LS User’s Guide iii...
  • Page 6 Changing a Trigger’s True State........97 Latching or Unlatching a Trigger ........97 Setting Segment Tolerance ..........98 Ending a Profile ...............98 Repeating a Profile............98 Using Ramp/Soak ..............99 Assigning a Profile to a Loop...........99 Running a Profile .............100 Ramp/Soak Displays............101 iv 8LS User’s Guide...
  • Page 7 Setup Menus ................114 Setup Inputs ..............114 Setup Carbon Burn Off ............116 Setup Alarms..............119 CP and DP Display ............119 Appendix C: 8LS Cascade Introduction................121 8LS Cascade Menus...............121 Cascade Main Menu ............121 Choosing the Primary Loop..........122 Setting the High End of the Secondary Setpoint .....122 Setting the Low End of the Secondary Setpoint ....122...
  • Page 8 8LS User’s Guide...

  • Page 9: Overview

    Tuning and Control: Explains PID control and provides tips for tuning your system. • Troubleshooting: Gives some basic guidelines for solving control problems. Appendix A: Describes the Ramp and Soak function in the 8LS con- • troller. — Appendix B: Describes the 8LS-CP controller its function, fea- •...

  • Page 10: System Diagram

    Overview System Diagram The illustration below shows how the parts of the 8LS are connected. When unpacking your system, use the diagram and parts list below to ensure all 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 8LS components are missing or damaged.

  • Page 11: Safety

    The 8LS includes a reset circuit that sets the control outputs off or to the — data stored in memory if the microprocessor resets normally the result of a power failure and power return.
  • Page 12 Overview 4 8LS User’s Guide...

  • Page 13: Introduction

    For example, the digital output from all the high process alarms can be directed to a single output for automatic process shutdown. Front Panel or Computer Operation: You can set up and run the 8LS from the front panel or from a local or remote computer. We offer ANASOFT, an IBM PC or compatible menu driven program, to set the 8LS parameters.
  • Page 14 Introduction Dual Output Standard: The 8LS includes dual control outputs for each loop with a second set 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.

  • Page 15: Specifications

    0 to 3200°F -18 to 1760°C 0 to 3210°F -18 to 1766°C -450 to 2370°F -268 to 1299°C RTD Ranges RTD1 -148.0 to +572.0°F -100 to 300°C 0.1° RTD2 -184.0 to +1544.0°F -120 to 840°C 0.2° 8LS User’s Guide 7...

  • Page 16: Control Capability

    PLC, full Duplex Error check BCC or CRC, menu selectable No. of controllers Each communications line: 32 with RS-485, 1 with RS-232 Power Supply Power input 85 to 132 Vac, .1A typical, 47 to 440 Hz 8 8LS User’s Guide...

  • Page 17: Installation

    Installation Installation This section explains how to install the 8LS. The instructions are written for nontechnical users. If you are technically 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 human life.

  • Page 18: Read This Before Installation

    8LS so dirt and pieces of wire don't fall through the slots. When you are finished with installation, remove the covers. Install the 8LS so the airflow to the slots in the housing is not restricted after installation. Make sure that other equipment does not block airflow to the housing slots.

  • Page 19: Mounting The 8Ls

    96mm x 96mm [3.78in x 3.78in], so there’s not a lot of room for error. 2. After the hole is cut, insert the 8LS through the front of the panel and screw the top and bottom clamps into place. If excessive vibration is anticipated a rear support may be required both for the 8LS and the interconnecting cables.
  • Page 20 UNITS 3.78’’ 3.58 ’’ 96 mm 90.9 mm ALARM SETPOINT STATUS OUTPUT% BACK ENTER RAMP ALARM CHNG AUTO SOAK 3.58 ’’ 90.9 mm 3.78’’ 96 mm Side 3.78’’ 3.58’’ 96 mm 90.9 9.4’’ 238.7mm 10.5’’ 266.7mm 12 8LS User’s Guide...

  • Page 21: External Wiring

    3.20’’ External Wiring During wiring, it is recommended that the 8LS electronics be removed or that temporary covers be put over the housing slots to ensure pieces of wire do not enter the housing and lodge in the electronics. Always ensure that the housing is clean when the electronics is plugged in.
  • Page 22 8LS. Normal use of the output wiring shield would be to connect one end only to the 120 VAC panel ground in the panel that the 8LS is mounted in. Actual use of the shields will be determined by the installation requirement.

  • Page 23: Cable Recommendations

    Carbon Probe Input Belden #88760 Digital PID Outputs and Digital Belden #9539 Belden #9542 Ribbon Cable Analog Outputs Belden #9154 Belden #8451 Computer Communication: Belden #9729 Belden #9730 RS232, RS422, RS485, or 20 Belden #9842 Belden #9843 8LS User’s Guide 15...

  • Page 24: Noise Suppression

    RFI may become a problem. This may cause the 8LS display to blank out and then re-energize as if power had been momentarily turned off. It may also cause the CPU in the equipment to reset, losing the PID output levels.
  • Page 25 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. 120 VAC 5 V Transorb HORN .01uf 130 VAC rating 47 ohm 1000 VDC 1/2 W or higher 8LS User’s Guide 17...

  • Page 26: Terminal Block And Connector Layout

    Installation Terminal Block And Connector Layout The 8LS terminal blocks and connectors are assigned according to the following two pages. Subsequent sections provide detailed connection descriptions. Communications Terminal Block 4 Jumper* Rx- Rx+ Tx- Tx+ RS-485 Connections Chas Gnd SHLD...

  • Page 27: Rtb Connections

    Sink Outputs. They are in reference to the 5Vdc supply. The outputs will be low when they are on. All digital inputs are TTL level inputs and may be selected from software if they will be high/false or low/true inputs. 8LS User’s Guide 19...

  • Page 28: Analog Inputs

    Common mode voltage is the voltage between the ground at the sensor and the ground at the 8LS. It can be an AC or DC voltage and appears equally at the high and low input terminals. Frequently it is caused by large currents flowing in the ground path between the 8LS and the sensors.

  • Page 29: Input Scaling

    Input Scaling The 8LS contains an area that can be used to install resistors to scale input voltages and convert milliamp inputs to match the -10 to 60mv (- 16.7% to 100%) input range. The input circuit is designed to enable connection of current inputs (such as 4 to 20ma), voltage inputs, and 3- Wire RTD.

  • Page 30: Resistor Installation

    Resistor Installation For scaling resistors the body of the resistor 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. 22 8LS User’s Guide...

  • Page 31: Voltage Inputs

    Thermocouple Inputs All thermocouple types may be directly connected to the Watlow Anafaze 8LS. Types J, K, T, R, S, B, and N linearization and cold junction compensation are provided standard in the Watlow Anafaze 8LS. For other thermocouple types, optional input ranges are required.

  • Page 32: Rtd Inputs

    The IRSM (infrared sensing module) is ideally suited for many infrared non-contact temperature applications. It can be supplied by Watlow Anafaze 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.

  • Page 33: Pulse Input

    Installation The range of the standard IRSM is 0-1000 degrees F with an output of 0-10ma dc. The input of the Watlow Anafaze 8LS is configured for a 0- 10madc input. To use more than four IRSM's with the 8LS, use an external power supply of 8-15vdc.
  • Page 34 Installation The Belden cable part number 88760 is highly recommended for the connection of the carbon probe to the 8LS. An equivalent cable may be used. Chas Probe Shield Probe Cable Belden #88760. Connect Shield to TB4-6 Chassis Ground. No. of CP...

  • Page 35: Control Outputs

    PID Output Termination TB (Primary) or Flat Ribbon (Secondary) The 8LS PID control outputs are Dual Outputs for each loop. For identification these are called primary and secondary control outputs. Therefore, each loop has control of two outputs, a primary and a secondary.

  • Page 36: Pid Control Relay Outputs

    Connections are made as follows: SSR 1 SSR 2 Screw Terminal Block 2 PID Ctl Out 1+ (TP or ON/OFF) PID Ctl Out 2+ (TP or ON/OFF) Logic Ground PID Ctl Out 3+ (Analog 4-20 mAdc) 28 8LS User’s Guide...

  • Page 37: Digital Outputs On The Screw Terminal Blocks

    See Terminal Block and Connector Layout. Primary Analog Outputs The 8LS provides either 4 to 20mA with 500 ohms maximum load or 0- 5vdc at 5mA maximum. Selection is made on internal dip switches. The control outputs are shipped as voltage outputs, and can be converted from voltage to current by changing the dip switch settings on the control output card.

  • Page 38: Analog Output Dip Switch Setting For 0-5V/4-20Ma

    Analog Output Dip Switch Setting for 0-5v/4-20mA Loop Switch Position 0-5 Vdc 4-20 mA Rear Rear Rear Rear Rear Rear Rear Rear Front Front Front Front Front Front Front Front O indicates an On switch, F indicates an Off switch. 30 8LS User’s Guide...

  • Page 39: Cpu Dip Switch

    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 must be OFF. NOTE Turn off the power before you set any DIP switch.
  • Page 40 Installation Connections are made as follows: SSR 1 SSR 2 Remote Terminal Block Ribbon Cable Pin PID Ctl Out 1 PID Ctl Out 2 +5Vdc Supply 32 8LS User’s Guide...

  • Page 41: Communications Set-Up And Connections

    Communications Set-up and Connections The 8LS offers two types of serial communications: RS- 232 and RS- 485. Up to 32 addresses can be set in the 8LS for one communication line. RS-232 can not be used for more than 1 controller.

  • Page 42: Rs-485 Description And Connections

    The RS-485 is a voltage balanced long distance multi-point transmission interface. It may use 2 or 4 lines depending on system requirements. The 8LS uses four lines [two lines can be accommodated on special order -- contact Watlow Anafaze]. RS-485 Description...
  • Page 43 A single "daisy chain" is recommended. Octopus connections or "spurs" are discouraged. 8LS User’s Guide 35...
  • Page 44 The fifth wire 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 Ground. Connect a 200 ohm terminating resistor between RX- and RX+ at the 8LS.

  • Page 45: Using The 8Ls

    Using the 8LS Using the 8LS This Chapter will show you how to use the 8LS from the front panel. Front Panel The 8LS front panel provides a convenient interface with the controller for both viewing the process conditions and operating the controller.

  • Page 46: Front Panel Keys

    ENTER Enter Press Enter to • Store data or menu choice after editing • Proceed to the next menu ALARM Alarm Ack Press Alarm Ack to • Acknowledge an alarm condition, reset global alarm digital output 38 8LS User’s Guide...
  • Page 47 Adjust output power level of loops in Manual mode RAMP SOAK Ramp/Soak Press Ramp/Soak to • Assign a Ramp/Soak profile to selected loop • Perform operations on profile you have assigned NOTE If the Ramp/Soak function is not installed, this key has no function. 8LS User’s Guide 39...

  • Page 48: Displays

    Using the 8LS Displays The next section discusses the 8LS displays: Bar Graph display • • Single Loop display • Scanning display • Alarm display Bar Graph Display This is the default display on power-up. It provides a system overview by displaying a deviation bar graph for each loop.

  • Page 49: Single Loop Display

    Single Loop display for each, for about a second. Press any arrow key to return to the Single Loop display. Alarm Display The Alarm display is the same as the Single Loop display except the alarm status is flashing. 8LS User’s Guide 41...
  • Page 50 The Alarm display interrupts 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 exists. 42 8LS User’s Guide...

  • Page 51: Operator Menus

    Press No to switch between Auto, Manual, and Tune. • Press Yes and then Enter to store your choice. • Press Back if you want to go back to Single Loop display without changing the mode. 8LS User’s Guide 43...

  • Page 52: Autotune

    PID constants were not calculated after 10 seconds (a failure of some sort). Ramp/Soak Use the Ramp/Soak key only if the optional Ramp/soak package is included in the controller. Information pertaining to programming and operation of ramp and soak profiles is included in the Ramp/Soak section. 44 8LS User’s Guide...

  • Page 53: Setup

    Setup Setup The Setup menus let you change the 8LS detailed configuration information. If you have not set up a modular system before, or if you don’t know what values to enter, please read the next section first, Tuning and Control, which contains PID tuning constants and useful starting values.
  • Page 54 PROM info Tol ? The R/S menu appears only if the Ramp and Soak option Last ? is installed in your 8LS. If it ’s not, the Test I/O display appears right after the Setup Alarms Edit display. Seg ?

  • Page 55: Setup Global Parameters Menu

    Job #? 1 Addr? 1 Restore Comm Err Job # ? Chk? Alarm Comm Delay? Baud? 96 R/S Time Comm Base ? H/M Ptcl? ANA Panel AC Line? Lock? Off 60 HZ Power Up PROM Outs? Off Information 8LS User’s Guide 47...

  • Page 56: Save As Job

    This is used to avoid nuisance alarms when starting up a system. LOOP PROCESS UNITS ALARM DELAY ? 0 ALARM SETPOINT STATUS OUTPUT% Selectable Range: 0-60 minutes. 48 8LS User’s Guide...

  • Page 57: Set R/S Time Base

    SETPOINT STATUS OUTPUT% Selectable values: Hours and minutes or minutes and seconds. NOTE This prompt appears only if your 8LS has the Ramp and Soak option installed. Lock Panel Use this menu to disable the front panel keys Chng SP, Man/Auto, and Ramp/Soak.

  • Page 58: Controller Address

    Controller Address Use this menu to set the 8LS controller address. This address is used for communications and each 8LS in a system must have a different address. Begin with address 1 for the first controller and assign each subsequent controller the next higher address.

  • Page 59: Communication Baud Rate

    AC line frequency, that accuracy will be reduced if this is not set correctly. LOOP PROCESS UNITS AC LINE? 60 HZ ALARM SETPOINT STATUS OUTPUT% Selectable values: 60 Hz or 50 Hz. 8LS User’s Guide 51...

  • Page 60: Eprom Version

    Setup EPROM Version Use this menu to see the controller’s EPROM version and checksum. LOOP PROCESS UNITS 8LS-RS V3.20 ALARM SETPOINT STATUS OUTPUT% 52 8LS User’s Guide...

  • Page 61: Setup Inputs Menu

    1 Hi Rdg Type? J ? 1000 1 Lo PV 1 Input (Only Pulse) (Only Linear & Pulse) Smplt? 1 1 Input 1 Lo Rdg Unit? °F 1 Offset 1 Hi PV (Only T/C & RTDs) ? 1000 8LS User’s Guide 53...

  • Page 62: Input Type

    INPUT TYPE? ALARM SETPOINT STATUS OUTPUT% Selectable range: See the table below for the input types and ranges available for the 8LS. he is editing. Character editing proceeds left to right one character at a time. Fahrenheit Celsius Input Type...

  • Page 63: Pulse Sample Time

    0-9, A-Z, %, degrees, /, space When entering three-character description (for Linear and Pulse), the editing proceeds left to right, one character at a time. After you enter the third character ,the display advances to the next menu. 8LS User’s Guide 55...

  • Page 64: Linear Scaling Menus

    The high input reading is referenced to 60mV and is calculated using this equation: (Sensor output @ High PV) HIGH RDG = (1000) 60 mV Low PV Display LOOP PROCESS UNITS 1 LO PV ALARM SETPOINT STATUS OUTPUT% Selectable range: 0-9999. 56 8LS User’s Guide...
  • Page 65 Sensor output @ high PV High RDG = 1000 (60 mV) Full scale 8LS input =1000 3. Set the Low PV to 100 and enter the units as P, S, and I. 4. Calculate the Low RDG and enter it:...

  • Page 66: Input Offset

    A positive value increases the reading and a negative value decreases it. LOOP PROCESS UNITS 1 OFFSET º ALARM SETPOINT STATUS OUTPUT% Selectable range: -300 to +300. 58 8LS User’s Guide...

  • Page 67: Setup Control Menu

    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 of Cool output parameters is skipped and the dis- play returns to the Setup Control prompt. 8LS User’s Guide 59...

  • Page 68: Heat/Cool Pb

    Use This menu to dampen the heat 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. LOOP PROCESS UNITS 1 CONTROL ALARM SETPOINT STATUS OUTPUT% Selectable range: 0-255. 60 8LS User’s Guide...

  • Page 69: 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. LOOP PROCESS UNITS 1 CONTROL SPR? ALARM SETPOINT STATUS OUTPUT% Selectable range: 0-255 engineering units. 8LS User’s Guide 61...

  • Page 70: Setup Outputs Menu

    If the channel 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. 62 8LS User’s Guide...

  • Page 71: Output Type

    Use this menu to set the Cycle Time for the TP outputs. LOOP PROCESS UNITS 1 OUTPUTS ? 10 ALARM SETPOINT STATUS OUTPUT% Selectable values: 1-255 seconds. NOTE This menu appears only if you set the output type to TP. 8LS User’s Guide 63...

  • Page 72: Output Action

    Use this menu to limit the maximum PID control output for a loop’s heat and cool outputs. This may be a constant limit or a temporary one subject to the output limit delay. LOOP PROCESS UNITS 1 OUTPUTS ? 100 ALARM SETPOINT STATUS OUTPUT% Selectable range: 0-100%. 64 8LS User’s Guide...

  • Page 73: Output Limit Time

    Use this menu to select one of two nonlinear output curves for nonlinear processes. LOOP PROCESS UNITS 1 OUTPUTS ?OFF ALARM SETPOINT STATUS OUTPUT% Selectable values: 1 (curve 1), 2 (curve 2), or Off (linear/no curve). The linear curves are shown below. 8LS User’s Guide 65...

  • Page 74: Heat Output

    1 HT OUT? TERM BLK ALARM SETPOINT STATUS OUTPUT% 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. 66 8LS User’s Guide...

  • Page 75: Setup Alarms

    HP? Off 1 HI Pro 1 Alarms Outpn? 0 Lp? Off 1 Alarms 1 Lo Pro Dev? 10 Outpn? 0 1 Alarms 1 Alarms Dev? Off Dbd? 2 1 Hi Dev 1 Alarm Outpn? 0 Dly? 0s 8LS User’s Guide 67...

  • Page 76: Alarm Types

    Global alarms occur when a loop alarm, set to Alarm, is unacknowledged, or when there are any unacknowledged failed sensor alarms. (If an alarm occurs, the 8LS front panel displays an appropriate alarm code). Even if the alarm condition goes away, the global alarm stays on until you use the Alarm Ack key (or ANASOFT) to acknowledge it.

  • Page 77: High Process Alarm Setpoint

    High Process Alarm Output Number Use this menu to assign the digital output that activates when the loop is in high process alarm. LOOP PROCESS UNITS 1 HI PRO OUTPN = 0 ALARM SETPOINT STATUS OUTPUT% Selectable values: 0-30. 8LS User’s Guide 69...

  • Page 78: Deviation Band Alarm

    Selectable values: 0-30. NOTE All digital outputs are "OR’ed" together (com- bined). Therefore, you can assign more than one alarm to the same output number, and that output will be On if any of those alarms is On. 70 8LS User’s Guide...

  • Page 79: Low Deviation Alarm Output Number

    Selectable values: Any value within the input sensor’s range. Low Process Alarm Status Use this menu to enable or disable the low process alarm. LOOP PROCESS UNITS 1 ALARMS ALARM SETPOINT STATUS OUTPUT% Selectable values: On, Off. 8LS User’s Guide 71...

  • Page 80: Low Process Alarm Output Number

    It delays failed sensor and process alarms until the alarm condition has been continuously present for longer than the alarm delay time you set. LOOP PROCESS UNITS ALARM DLY? ALARM SETPOINT STATUS OUTPUT% Selectable values: 0-255 seconds. 72 8LS User’s Guide...

  • Page 81: Test I/O

    1’s (High) or 0’s (Low). the menu displays inputs 1 through 12. Input 12 Input 9 LOOP PROCESS UNITS INS = 1 1 1 1 1 1 1 1 1 1 1 1 ALARM SETPOINT STATUS OUTPUT% Input 1 Input 8 8LS User’s Guide 73...

  • Page 82: Test Output

    Use this menu to toggle the state of a digital output between On and Off. LOOP PROCESS UNITS NR01? OFF ALARM SETPOINT STATUS OUTPUT% Selectable values: On, Off. NOTE Before leaving this menu, turn Off all the outputs you have turned On. 74 8LS User’s Guide...

  • Page 83: Tuning And Control

    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 control modes to function, the loop must be in automatic mode. 8LS User’s Guide 75...

  • Page 84: Control Modes

    PB of º --the output is: º • 50% when the process variable is 990 º • 75% when the process variable is 985 º • 100% when the process variable is 980 F or below. 76 8LS User’s Guide...
  • Page 85 º For example, if a process tends to settle about 5 F below the setpoint, use Integral control to bring it to the desired setting. (The next diagram shows a process under proportional and integral control.) 8LS User’s Guide 77...

  • Page 86: Control Outputs

    Use it to eliminate the process variable overshoot common to PI control. (This figure shows a process under full PID control). Control Outputs The 8LS provides a 5 Vdc digital 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.
  • Page 87 Direct action is an output control action in which an increase in the process variable causes an increase in the output. Heating applications normally use reverse action and cooling applications usually use direct action. 8LS User’s Guide 79...

  • Page 88: Setting Up And Tuning Pid Loops

    2100 to 2199 3200 to 3299 ° 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. 80 8LS User’s Guide...
  • Page 89 Derivative Term (TD) Settings This table shows Derivative term (TD) versus Rate Minutes (RM); Rate=TD/60. Rate Rate (secs./repeat) (repeats/min) (secs./repeat) (repeats/min) As a general rule, set the TD to 15% of TI as a starting value. 8LS User’s Guide 81...

  • Page 90: General Pid Constants By Application

    º Cool-TP Reverse Heat w/SSR Heat-DSC Set spread to 0 º Cool w/ solenoid valve Direct º Cool w/ fans Direct Electric heat w/ open º Reverse heat coils º Electric heat w/ SCR Reverse Controllers 82 8LS User’s Guide...
  • Page 91 Tuning and Control 8LS User’s Guide 83...
  • Page 92 Tuning and Control 84 8LS User’s Guide...

  • Page 93: Troubleshooting

    Troubleshooting Troubleshooting NOTE If you need to return the 8LS to Watlow-Anafaze, please call first for a Returned Materials Authori- zation (RMA) number. This number helps us track your equipment and return it to you as soon as possible. Stand Alone Systems If the unit has no display, check the 120vac power supply.

  • Page 94: Computer Supervised Systems

    The communications link The computer software If the system does not work on initial startup, check the 8LS, the computer, and the serial link. First, check the 8LS in the stand alone mode. If there’s a problem, return the 8LS to Watlow-Anafaze for service.

  • Page 95: Communications Problems

    Troubleshooting If you write your own software, first write a routine that sends and receives display commands to and from the 8LS. The protocol includes all characters, so the display should show the hexadecimal values of the data sent in both directions. If you have problems with the software you write, you can use this program to test your communications.
  • Page 96 Troubleshooting 88 8LS User’s Guide...

  • Page 97: Appendix A: Ramp Soak

    Fast setup for similar profiles: You can set up one profile, then • copy it and alter it to set up the rest. External reset: Use the 8LS external reset menu to configure a digi- • tal input you can use to reset a profile to the Ready state.

  • Page 98: Specifications

    Segment time? Back Segment setpoint? Edit segment Segment event Segment event events? output #? active state? Edit segment Trigger active Trigger input #? triggers? state? Edit segment tolerance? Trigger latch status? Back Last segment? Repeat cycles? 90 8LS User’s Guide...

  • Page 99: Setting The R/S Time Base

    Answering Yes to this prompt allows you to setup or edit R/S profiles. Choosing a Profile to Edit Use this menu to choose a profile to set up or edit. LOOP PROCESS UNITS R/S PRO PROF? A ALARM SETPOINT STATUS OUTPUT% Selectable Values: A to H (8 profiles). 8LS User’s Guide 91...

  • Page 100: Copying The Setup From Another Profile

    The tolerance timer resets. You must acknowledge the tolerance alarm by pressing the ALARM ACK key before you can do any other editing. Selectable Values: 0:00 to 99:59 (minutes or hours, depending on the time base setting). 92 8LS User’s Guide...

  • Page 101: Editing The Ready Setpoint

    SETPOINT STATUS OUTPUT% When you press NO, you will advance to the next menu. If you press YES, this menu appears: LOOP PROCESS UNITS A READY DO01?OFF ALARM SETPOINT STATUS OUTPUT% Selectable Values: On or Off. 8LS User’s Guide 93...

  • Page 102: Choosing An External Reset Input

    Setting Segment Time Use this menu to change the segment’s time. LOOP PROCESS UNITS A SEG 01 T? 0:00 ALARM SETPOINT STATUS OUTPUT% Selectable Values: 000:00-999:59 (minutes or seconds, depending on the selected time base). 94 8LS User’s Guide...

  • Page 103: Setting A Segment Setpoint

    If you also want to have events at the end of the segment, or you want the event to go off at the end of the segment, setup the first segment with the desired event number and event output state. 8LS User’s Guide 95...

  • Page 104: Editing Event Outputs

    Use this menu to edit triggers for the current segment. LOOP PROCESS UNITS A SEG 01 TRIGGRS? ALARM SETPOINT STATUS OUTPUT% Selectable Values: YES (to edit triggers of current segment), or NO (to advance to the Edit Segment Tolerance menu). 96 8LS User’s Guide...

  • Page 105: Assigning An Input To A Trigger

    If an unlatched trigger becomes false, the segment timer stops and the loop goes into trigger wait state. LOOP PROCESS UNITS A S01TR1 LATCH? N ALARM SETPOINT STATUS OUTPUT% Selectable Values: N (No: unlatched), Y (Yes: latched). 8LS User’s Guide 97...

  • Page 106: Setting Segment Tolerance

    Repeating a Profile Use this menu to set the number of times you want a profile to repeat or cycle. LOOP PROCESS UNITS CYCLE? 1 ALARM SETPOINT STATUS OUTPUT% Selectable Values: 1-99, or C (continuous cycling). 98 8LS User’s Guide...

  • Page 107: Using Ramp/Soak

    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. LOOP PROCESS UNITS 1 SELECT PROF? 0 ALARM SETPOINT STATUS OUTPUT% Selectable Values: A-H, or 0. 8LS User’s Guide 99...

  • Page 108: Running A Profile

    1. Press the RAMP/SOAK key repeatedly until you see the Ramp/Soak mode menu. 2. While the profile is in Ready segment, the only mode available is the Run mode. 3. Press YES to start the profile, and then ENTER to advance to the next menu. 100 8LS User’s Guide...

  • Page 109: Ramp/Soak Displays

    The profile is in trigger wait state. This is the Single Loop display when a profile is running. Process variable Engineering units Loop number LOOP PROCESS UNITS 73 S 0 Setpoint ALARM SETPOINT STATUS OUTPUT% Profile mode Output percentage 8LS User’s Guide 101...
  • Page 110 How long has the profile run? From Single Loop display, press the RAMP/SOAK key once. The next menu appears only if you have already assigned a profile to the loop. LOOP PROCESS UNITS 1A00/20S TR 0:00 ALARM SETPOINT STATUS OUTPUT% 102 8LS User’s Guide...

  • Page 111: Holding A Profile Or Continuing From Hold

    ALARM SETPOINT STATUS OUTPUT% • While the profile is running, the only mode you will be able select is Hold. • Press YES to hold the profile, and then ENTER to advance to the next menu. 8LS User’s Guide 103...

  • Page 112: Resetting A Profile

    1. Press RAMP/SOAK key repeatedly until you see the R/S mode menu 2. Press the NO key. You should see the menu below. 3. Press YES to reset the profile, and then ENTER to confirm your choice. LOOP PROCESS UNITS 1A00/20S RESET? A ALARM SETPOINT STATUS OUTPUT% 104 8LS User’s Guide...

  • Page 113: Appendix B: 8Ls-Cp

    Dew point of atmosphere generators or the percentage of Carbon Potential of hardening and sintering furnaces. The 8LS-CP can accept direct connection of one to four Zirconia carbon probes without any special external signal conditioning amplifiers. The...

  • Page 114: System Configuration

    Each CP input requires two loops. The 8LS-CP is factory configured to contain between 1 to 4 CP loops. The unit must be ordered for the number of CP inputs required per 8LS. Loops not used for the CP input may be used as standard inputs.
  • Page 115 Appendix B: 8LS-CP The 8LS-CP is not only ordered for the number of carbon input loops desired, but the CPU DIP Switch on the CPU board must be set correctly to reflect the number of carbon inputs. CPU DIP Switch...

  • Page 116: Specifications

    Appendix B: 8LS-CP Specifications The standard specifications listed in the Introduction section of this manual apply to the 8LS-CP with the following additions: Analog Inputs Each CP Input: • 1 Loop Selectable Type N, K, R, or S T/C Reference Temperature for •...

  • Page 117: Cp Control

    PID outputs to zero percent output. Trim Gas Temperature Alarm Output The 8LS-CP has a digital output, available for each CP input, that is called the CP Gas Alarm. This output is selectable from the alarm menu of the CP loop as one of the 1-30 digital outputs available.

  • Page 118: Recommended Cp Trim Gas Alarm For Continuous

    1400ºF. This requires that the CP gas alarm output will be maintained below the 1400ºF limit. The 8LS-CP gas output of the carbon loop alarm function will be On or Low whenever the PV of the reference T/C input is between 1400 to 2400ºF.

  • Page 119: Carbon Probe

    To minimize carbon build-up: a. Avoid high carbon sooting if at all possible. b. Clean off the carbon on the probe with a carbon burn-off. 8LS User’s Guide 111...

  • Page 120: Probe Burn Off

    Set the SP for maximum probe temperature of either 1900 or 2100 º F. The carbon burn off cycle will stop if temperature exceeds the limit. The burn off will continue when tempera- ture goes below the limit. 112 8LS User’s Guide...

  • Page 121: Burn Off Function

    Demand push-button Burn Off Function The carbon probe burn off function of the 8LS-CP is designed to supply excess fresh reference air to the outside of the probe assembly. When the excess air is exited at the end of the probe assembly, it supplies excess oxygen for the burning off of the built up carbon on the end of the probe.

  • Page 122: Setup Menus

    CO+CO2% and % of Hydrogen. The mV selection is not referenced to the temperature loop and is a direct reading of the probe millivolts. LOOP PROCESS UNITS 2 INPUTS TYPE? CP ALARM SETPOINT STATUS OUTPUT% Selectable values: CP, DP, or MV. 114 8LS User’s Guide...

  • Page 123: Engineering Units

    Upon selecting the DP type and following the Hydrogen menu, the next menu is available. Use it to select if the reading is in ºF or ºC. LOOP PROCESS UNITS 2 INPUTS UNIT? ºF ALARM SETPOINT STATUS OUTPUT% Selectable Values: F or C. 8LS User’s Guide 115...

  • Page 124: Setup Carbon Burn Off

    -300 to +300 º F/C WARNING Incorrect setting of these 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- LOOP PROCESS UNITS BURNOFF?
  • Page 125 0, the procedure will not start from any digital input and the burn off function will be deactivated. LOOP PROCESS UNITS 2BO STRT INPUT? 0 ALARM SETPOINT STATUS OUTPUT% Selectable Range: 1-12, or 0. 8LS User’s Guide 117...
  • Page 126 Use it to edit the digital output number that controls the burn off air flow. Setting the number to 0 means the air flow digital output will not be activated. LOOP PROCESS UNITS 2BO AIR OUTPT? 0 ALARM SETPOINT STATUS OUTPUT% Selectable Range: 1-30 or 0. 118 8LS User’s Guide...

  • Page 127: Setup Alarms

    The next table shows the CP loop out of range indications. Process condition Indication Reference T/C is below 1400 º F Reference T/C is above 2400 º F Probe MV is below 960 MVDC Probe MV is above 1275 MVDC 8LS User’s Guide 119...
  • Page 128 Appendix B: 8LS-CP 120 8LS User’s Guide...

  • Page 129: Appendix C: 8Ls Cascade

    Appendix C: 8LS Cascade Appendix C: 8LS Cascade Introduction The Cascade control feature allows the output percentage of one control loop to be used as the setpoint of a second control loop. The loop providing the output is called the Master or Primary loop. The loop that is using the output is called the Slave or Secondary loop.

  • Page 130: Choosing The Primary Loop

    Appendix C: 8LS Cascade Choosing the Primary Loop Use this selection to choose the primary loop for cascade control. This loop provides the output for the Secondary loop, which is the current loop as it appears on the upper line of the display.

  • Page 131: Glossary

    A serial communications error checking method. An acceptable method for most applications, Ambient Temperature BCC is the default method. See CRC. The temperature of the air or other medium that surrounds the components of a thermal system. 123 8LS User’s Guide...
  • Page 132 It is usually above the heating propor- components. tional band and below the cooling proportional See Serial Communications. band. See Baud Rate. Default Parameters The programmed instructions that are perma- nently stored in the microprocessor software. 124 8LS User’s Guide...
  • Page 133 A metal rod, usually copper, that provides an couple breaks, infrared problems or resistance electrical path to the earth, to prevent or reduce temperature detector (RTD) open or short fail- the risk of electrical shock. ures. Electrical Noise See Noise. 8LS User’s Guide 125...
  • Page 134 Also Input Type referred to a "safety ground". The signal type that is connected to an input, such as thermocouple, RTD, linear or process. 126 8LS User’s Guide...
  • Page 135 Input 0 for and auxiliary control outputs. Linear, 1 or 2 for non linear. 8LS User’s Guide 127...
  • Page 136 Pulse Input Digital pulse signals from devices, such as opti- cal encoders. Panel Lock A feature that prevents operation of the front panel by unauthorized people. Ramp A programmed increase in the temperature of a setpoint system. 128 8LS User’s Guide...
  • Page 137 See Relay, Solid State. which 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. 8LS User’s Guide 129...
  • Page 138 (cold junction). TI (Timed Integral) The Integral term. Transmitter A device that transmits temperature data from either a thermocouple or RTD by way of a two- wire loop. The loop has an external power supply. 130 8LS User’s Guide...
  • Page 139 Glossary 8LS User’s Guide 131...
  • Page 140 Glossary 132 8LS User’s Guide...

Table of Contents