Appendix A: Watlow – Hi-Limit Controller
Contents
1. WATLOW HI LIMIT CONTROLLER APPENDIX A a a Z W Q EL Series L User s Manual lt a A Z Lu A A lt Series L Temperature Limit C TOTAL CUSTOMER SATISFACTION 3 Year Warranty ISO 9001 A LOW asl LS a QRZ Registered Company 1241 Bundy Boulevard Winona Minnesota USA 55987 DA DID Phone 1 507 454 5300 Fax 1 507 452 4507 http www watlow com 0600 0044 0001 Rev F Made in the U S A November 2006 5 00 CAUTION or WARNING Electrical Shock Hazard CAUTION or WARNING Safety Information We use note caution and warning symbols throughout this book to draw your attention to important operational and safety information A NOTE marks a short message to alert you to an important detail A CAUTION safety alert appears with information that is important for protecting your equipment and performance Be especially careful to read and follow all cautions that apply to your application A WARNING safety alert appears with information that is important for protecting you oth ers and equipment from damage Pay very close attention to all warnings that apply to your application The safety alert symbol an exclamation point in a triangle precedes a general CAUTION or WARNING statement The electrical hazard symbol a lightning bolt in a triangle precedes an electric shock haz ard CAUTION or WARNING safety statement Tec2. 3rd F Taehong Bldg 20 6 Seocho gu Yangjae dong Seoul Korea 137 130 Telephone 82 2 575 9804 Fax 82 2 575 9831 Watlow Malaysia Sdn Bhd 38B Jalan Tun Dr Awang 11900 Bayan Lepas Penang Malaysia Telephone 60 4 641 5977 Fax 60 4 641 5979 Watlow Singapore Pte Ltd Ayer Rajah Crescent 03 23 Ayer Rajah Industrial Estate Singapore 139949 Telephone 65 773 9488 Fax 65 778 0323 Watlow Electric Taiwan 10F 1 No 189 Chi Shen 2nd Road Kaohsiung Taiwan Telephone 886 7 288 5168 Fax 886 7 288 5568
3. D 68 0 mm 2 68 in 68 0 mm 2 68 in Spade Terminal Model Customer Front Panel Mounting Bracket Contact your local Greenlee supplier for the appropriate punch kit and cutout tool for rapid mounting Screw Terminal Models installation See Figure 4 Slide the collar firmly against the back of the panel getting it as tight as possible To ensure a tight seal use your thumb to lock the tabs into place while pressing the case from side to side Don t be afraid to apply enough pressure to install the controller The tabs on each side of the collar have teeth that latch into the ridges Each tooth is staggered at a different height so only one of the tabs on each side are ever locked into the ridges at a time Confirm that the tabs on one side of the collar correspond with those on the opposite side Make sure the two cor responding tabs are the only ones locked in the ridges at the same time If the corresponding tabs are not supporting the case at the same time you will not have a NEMA 4X seal Insert the control chassis into its case and press the bezel to seat it Make sure the inside gasket Chapter 2 Installation is also seated properly and not twisted The hard ware installation is complete Proceed to the wir ing section Insert the controller into the panel cutout 3 While pressing the bezel firmly against the panel slide the mounting bracket over the back of the controller Be sure t
4. 328 to 1 472 F R 100 Q RTD 200 to 800 C S Type E 328 to 1 470 F T Type E 200 to 800 C Limit Type U High Limit Manual Reset on power up manual reset on over temperature W High Limit Auto Reset on power up manual reset on over temperature Y Low Limit Manual Reset on power up manual reset on under temperature Z Low Limit Auto Reset on power up manual reset on under temperature Low Limit Set Point Range Limit XXXX Low Limit Set Point Operating Range Value High Limit Set Point Range Limit XXXX High Limit Set Point Operating Range Value Overlay Custom Option A Standard Note Set point ranges must fall within the sensor operating range Note A is used in the left digit of the operating range to indicate negative values Watlow Series L 16 Appendix Declaration of Conformity Series L Watlow Winona Inc 1241 Bundy Blvd Winona MN 55987 USA Declares that the following product Designation Series L Model Numbers LF C E or G 1 2 3 4 5 6 or 7 any letter U W Y or 2 any four numbers or and three numbers AAAA may be followed by addi tional numbers or letters LV C E or G 1 2 5 or 6 any letter U W Y or 2 any four numbers or and three numbers any four numbers may be followed by additional num bers or letters Classification LF and LV Temperature Regulator Installation Category II Pollution degree 2 Rated Voltage 24 120 230 240
5. even if the process is within ES Gen limits An operator must use the reset key or switch to Panel 2 04 in manually re energize the output on power up Depth including DIN rail 94 7 mm 3 73 in manual reset A feature on a limit controller that requires human intervention to return the limit to nor Note These specifications are subject to change without mal operation after a limit condition has occurred prior notice safety limit An automatic limit intended for use in applications where an over temperature fault may cause a fire Watlow Series L 14 Appendix Ordering Information and Model Numbers Limit Control no user interface F O S a AAAA Set Point Type F Fixed Limit Set Point Line Voltage C 120V ac E 230 to 240V ac G 24V ac Controller Package 1 Panel Mount Square 1 8 DIN Spade Terminals 2 DIN Rail Mount Spade Terminals 3 Open Board not potted Spade Terminals 4 Potted Case Spade Terminals 5 Panel Mount Square 1 8 DIN Screw Terminals 6 DIN Rail Mount Screw Terminals 7 Open Board not potted Screw Terminals Sensor and Sensor Operating Range Type J 346 to 1 900 F Type J 210 to 1 038 C Type K 454 to 2 500 F Type K 270 to 1 370 C Type T 454 to 750 F Type T 270 to 400 C 100 O RTD 328 to 1 472 F 100 Q RTD 200 to 800 C Type E 328 to 1 470 F Type E 200 to 800 C OO I DT 2 F amp F TFA cI Limit Type U High Limit External manual reset on power u
6. F and CF only controllers that does not recognize power outage as a e 230 to 240V ac 10 15 50 60 Hz 5 limit condition When power is restored the output is e 10VA maximum power consumption re energized automatically as long as the temperature e Data retention upon power failure via nonvolatile is within limits memory latched output Limit control output latches in de Operating Environment energized condition when over or under temperature e 0 to 70 C 32 to 158 F condition occurs and cannot be reset unless tempera e 0 to 90 RH non condensing ture drops below set point SE limit or limit controller A highly reliable discrete Dimensions safety device redundant to the primary controller that e DIN Rail model can be DIN rail or chassis mount monitors and limits the temperature of the process or a DIN rail spec DIN 50022 35 mm x 7 5 mm 1 38 in x 0 30 in point in the process When temperature exceeds or falls below the limit set point the limit controller interrupts Style Depth power through the load circuit A limit controller can 15 mo protect equipment and people when it is correctly in 2 43 in 2 43 in 1 78 in stalled with its own power supply power lines switch a on en manual power reset A feature in latching limit 90 7 mm controllers that does recognize power outage as a limit See 20 STE condition When power is restored the output is not re shea ee i o panel energized automatically
7. Mutual and CSA approved These controllers are available with or without an operator interface and can be ordered in square 1 8th DIN panel mount din rail mount open board or pot ted module design configurations Push on quick con nect spade terminal or removable screw clamp style terminal block ordering options provide the electrical connections The microprocessor design platform provides im provements in the performance repeatability and ac curacy offered by Watlow s current line of basic control products The Series LV includes an operator interface to al low viewing and selection of the limit set point A red four character seven segment LED displays the limit set point The limit set point selection is made with a continuous turn velocity sensitive rotary encoder Push to Set operation reduces accidental limit set point adjustments Limit set point operating range temperature values are customer definable in the product configuration part number The Series LF offers fixed limit set points These units are supplied without an operator interface Limit set point temperature values are customer definable in the product configuration part number The features and performance of these products make them ideally suited for a wide range of industrial limit control applications in the food preparation in dustrial machinery packaging and plastic markets Watlow s Series L limit controllers include industry leading servi
8. ON 3 Year Warranty Corporate Headquarters in the U S Watlow Electric Manufacturing Co 12001 Lackland Road St Louis Missouri USA 63146 Telephone 1 314 878 4600 Fax 1 314 878 6814 Europe Watlow GmbH Industriegebiet Heidig Lauchwasenstr 1 Postfach 1165 Kronau 76709 Germany Telephone 49 0 7253 9400 0 Fax 49 0 7253 9400 44 Watlow France S A R L Immeuble Somag 16 Rue Amp re Cergy Pontoise CEDEX 95307 France Telephone 33 1 3073 2425 Fax 33 1 3073 2875 Watlow Italy S R L Via Meucci 14 20094 Corsico MI Italy Telephone 39 02 4588841 Fax 39 02 458 69954 Watlow Limited Robey Close Linby Industrial Estate Linby Nottingham England NG15 8AA Telephone 44 0 115 9640777 Fax 44 0 115 9640071 Latin America Watlow de M xico Av Fundici n 5 Col Parques Industriales Quer taro Qro M xico CP 76130 Telephone 52 442 217 6235 Fax 52 442 217 6403 Asia Pacific Watlow Australia Pty Ltd 23 Gladstone Park Drive Tullamarine Victoria 3043 Australia Telephone 61 39 335 6449 Fax 61 39 330 3566 Watlow China Inc 179 Zhong Shan Xi Road Hong Qiao Cointek Bldg FI 4 Unit P Shanghai 200051 China Telephone 86 21 6229 8917 Fax 86 21 6228 4654 Watlow Japan Ltd K K Azabu Embassy Heights 106 1 11 12 Akasaka Minato ku Tokyo 107 0052 Japan Telephone 81 03 5403 4688 Fax 81 03 5403 4646 Watlow Korea Co Ltd
9. V ac Rated Frequency 50 or 60 Hz Rated Power Consumption 10VA maximum Meets the essential requirements of the following European Union Directives by using the relevant standards shown below to indicate compliance 89 336 EEC Electromagnetic Compatibility Directive EN 61326 1997 With A1 1998 A2 2001 EN 61000 4 2 1996 A1 1998 EN 61000 4 3 1997 EN 61000 4 4 1995 EN 61000 4 5 1995 A1 1996 EN 61000 4 6 1996 EN 61000 4 11 1994 EN 61000 3 2 1995 A1 3 1999 EN 61000 3 3 1995 A1 1998 Electrical equipment for measurement control and labora tory use EMC requirements Industrial Immunity Class B Emissions Electrostatic Discharge Immunity Radiated Field Immunity Electrical Fast Transient Burst Immunity Surge Immunity Conducted Immunity Voltage Dips Short Interruptions and Voltage Variations Immunity Harmonic Current Emissions Voltage Fluctuations and Flicker 73 23 EEC Low Voltage Directive EN 60730 1 2000 With A11 2002 and EN 60730 2 9 2002 Raymond D Feller III Name of Authorized Representative General Manager Title of Authorized Representative Kh LL or ignature of Authorized Representative Automatic electric controls for household and similar use Particular requirements for temperature sensing controls Winona Minnesota Place of Issue February 2004 Date of Issue How to Reach Us Your Authorized Watlow Distributor TOTAL CUSTOMER SATISFACTI
10. ase limit set point turn knob counter clockwise The new set point is entered 3 seconds after the knob stops moving Limit set point will not change unless SET RESET key is pressed F or C Indicator Light Lit to indicate if unit is configured for degrees Fahrenheit or degrees Celsius ALARM Indicator Light Lit when limit is tripped Increment and Decrement Keys Press the Up Arrow key to increase the limit set point Press the Down Arrow key to decrease the limit set point The new set point is entered 3 seconds after the last key press The limit set point will not change unless the SET RESET key is presses A Caution FM approval requires limit switches to be suitably enclosed to restrict casual user adjustment To adjust the Calibration Offset on models with tactile keys first hold down both the Increment and Decre ment keys for five seconds The display will first show for five seconds then it will display the Cali bration Offset value Adjust the value with the Incre ment and Decrement keys range 30 to 30 The new value will take effect three seconds after the last key stroke The display will blink then return to the pri mary display after five seconds Watlow Series L scale 10 To change the temperature units on models with tactile keys first hold down both the Increment and Decrement keys for ten seconds The display will show ES for two seconds Adjust the units with the In creme
11. be bad e Ambient temperature in the control cabinet is over 70 C e Ground loop problem Can occur when using a switched DC output and a grounded thermocouple e Thermocouple polarity is reversed In the US red wire insulation denotes the negative wire e Sensor is bad Thermocouple is shorted e Copper wire was used instead of ther mocouple extension wire Connectors of metals different than thermocouple metal were used to splice or make connections e Check the model part number for Degree C or F If the model has Incre ment Decrement keys then the C F setting is adjustable e Place a jumper wire across the ther mocouple input terminals The display should indicate ambient temperature If it does the limit is OK For high limit Start with limit set point above ambient temperature ALARM LED should be off Decrease limit set point until ALARM LED goes on It should be approximately ambi ent temperature For low limit Start with limit set point below ambient temperature ALARM LED should be off Increase limit set point until ALARM LED goes on It should be approximately ambient tem perature Measure temperature in cabinet to ensure it is below 70C Vent cabinet or add fans if necessary Remove power from the system Use an ohm meter to measure resistance between output DC and the thermo couple sheath If there is continuity replace sensor with an ungrounded thermocouple Check thermocouple c
12. ce support and a 3 year warranty Also available Series C an on off temperature controller version Watlow Series L 1 Features and Benefits Four Character LED Display e Improves limit set point adjustment accuracy Fixed or Adjustable Limit Set Points e Tamper proof operation e Control flexibility Set Point Adjustment Opetions e Rotary encoder e Tactile increment and decrement keys Push to Set e Reduce accidental limit set point adjustments Multiple Mounting Options e Minimizes installation time High or Low Limit Operation e Application flexibility Fahrenheit or Celsius Operation with Indication e Application flexibility Sensor Break Protection e Provides positive system shutdown Agency Approvals e Meets requirements for agency certification e NEMA 4X IP65 seal panel mount versions avail able Micro Processor Based Technology e Accurate and repeatable protection Stock to Four Day Delivery Chapter 1 Overview Installation Installing the Open Board Controller ge 45 07 mm 1 775 in 61 7 mm 243 in mm 45 07 mm 1 775 in 56 3 mm 2 22 in 61 7mm 2 43 in eet 2 22 in 61 7mm 55 9mm 2 43 in 2 20 in 61 7mm 55 9mm 2 43 in 2 20 in Terminal Designation Sticker Use M2 5 4 mounting hardware not included Terminal Designation Sticker Use M2 5 4 mounting hardware not included Spade Terminal Model Screw Terminal Model Fi
13. e will be a 2 6C 4 7 F error for every ohm of lead wire resistance See input troubleshooting Verify limit set point setting e Press RESET key to reset limit e Verify wiring Relay outputs act as a switch they do not source power e See input troubleshooting e Verify limit set point setting e Repair or replace limit e See input troubleshooting e Verify limit set point setting e Remove wires from output of limit to input of power switching device If load is still on replace power switching device If load turns off replace limit or sensor See input troubleshooting e Verify wiring Chapter 5 Troubleshooting Specifications Controller e Microprocessor based limit controller e Nominal switching hysteresis typically 1 7 C 38 F e High or low limit factory selectable e Latching output requires manual reset upon over or under temperature condition e Manual or automatic reset on power loss factory selectable e Internal front panel or external customer supplied momentary reset switch e Input filter time 1 second Operator Interface model dependent e Four digit 7 segment LED displays 28 high e F or C indicator LED e ALARM indicator LED e Continuous turn velocity sensitive rotary encoder for limit set point adjustment e Front panel SET RESET key on variable set point models e No operator interface on fixed set point models Standard Conditions For Specif
14. er out the front of the DIN rail bracket Al ternate back and forth between the top and then the bottom Be sure to support the controller as it comes out of the bracket See Figure 3b Press forward with thumb Insert flat blade screw driver here Figure 3b A Caution FM approval requires limit switches to be suit ably enclosed to restrict casual user adjustment Chapter 2 Installation APPENDIX A a A Z W Q a Cr 72 4 mm 7 2 85 in Panel Cutout Panel Thickness 1 52 to 3 18 mm 72 4 mm 2 85 in 0 060 to 0 125 in 19 1 mm 0 79 in minimum 19 1 mm 0 79 in minimum 84 5 mm square 3 33 in ja 6 4 mm 0 25 in 0 76 in Tactile Key Screw Terminal Model Figure 4 Spade Terminal Model Installing the Square 1 8 DIN Panel Mount Controller 1 Make the panel cutout using the mounting dimen sions above 2 Remove mounting bracket from the back of the controller 3 If your controller has a gasket check to see that the gasket is not twisted and is seated within the case bezel flush with the panel Place the case in the cutout Make sure the gasket is between the panel cutout and the case bezel 4 While pressing the front of the case firmly against the panel slide the mounting collar over the back of the control The tabs on the collar must line up 5 with the mounting ridges on the case for secure Watlow Series L 4 51 7 mm 2 04 in
15. g e Limit set point is not set correctly e Limit output is tripped latched e Output wiring is incorrect e Temperature appears to be incor rect see input troubleshooting e Limit set point is not set correctly e Limit output is defective e Temperature reading is incorrect on display of indicating controls or limit see input troubleshooting e Set point is not set correctly e Power switching device mechani cal relay contactor etc is shorted Limit output shorted e Output wiring is incorrect 12 Corrective Action Check model part number for De gree C or F If the model has Incre ment Decrement keys then the C F setting is adjustable e Place a 110 ohm resistor across the sensor input terminals For high limit Start with limit set point above ambient temperature ALARM LED should be off De crease limit set point until ALARM LED goes on It should be approxi mately ambient temperature If it does the limit is OK Sensor or con nections may be bad For low limit Start with limit set point below ambient temperature ALARM LED should be off In crease limit set point until ALARM LED goes on It should be approxi mately ambient temperature If it does the limit is OK Sensor or con nections may be bad Measure temperature in cabinet to ensure it is below 70 C 158 F Vent cabinet or add fans if necessary Check sensor connections Measure lead wire resistance Ther
16. gure 2a 1 Locate and drill four 3 2 mm 0 125 in holes in the desired panel location See Figure 2a for hole locations 2 Mount the controller using four M2 5 4 screws Installing the Potted Controller Terminal Designation Sticker 70 1 mm 2 76 in 35 1 mm 1 38 in 102 9 mm 4 05 in 3 50 in Terminal Designation Sticker Terminal Designation Sticker not included Figure 2b 1 Drill two 5 mm 0 187 in diameter holes in the desired panel location See Figure 2b for hole locations 2 Mount the controller using two M3 5 6 screws Watlow Series L Use 3 5M 6 hardware 2e 46 6 mm 1 84 in 35 1 mm 1 38 in Chapter 2 Installation Installing the DIN Rail Mount Controller 94 7 mm 3 73 in 78 1 mm 3 08 in 90 7 mm 3 57 in Part Number Label 4 00 in f 112 3m 3 16 in 4 42 in To install press in here To remove pull out here See Mounting Removing the DIN Rail Controller procedures below Panel mounting the bracket requires two M3 5 6 screws not included Figure 3a Sub Panel Mounting 1 Using the controller as a location template mark both mounting holes 2 Drill and tap two 2 7 mm 0 106 in diameter holes in the desired panel location See Figure 3a above for hole locations 3 Mount the controller using two M3 5 6 screws DIN Rail Mounting 1 Place the DIN rail upper mounting clip on the top edge of the DIN rai
17. he levers on the mounting bracket line up with the teeth on the case 4 Press the bracket up to the back of the panel The controller should fit tightly in the panel cutout a a Z W Q EL Removing the Panel Mount Square 1 8 DIN Controller 1 Remove power from the system 2 Remove all the wiring connections from the back of the controller 3 Slide a thin wide tool putty knife under all three mounting tabs top then bottom while pushing for ward on the back of the case Be ready to support the controller as it slides out of the panel cutout N Caution FM approval requires limit switches to be suitably enclosed to restrict casual user adjustment Watlow Series L 50 Chapter 2 Installation Wiring A Warning Use National Electric NEC or other country specific standard wiring and safety practices when wiring and connect ing this controller to a power source and to electrical sen sors or peripheral devices Fail ure to do so may result in dam age to equipment and property and or injury or loss of life Note Insulated terminals required for quick connect style terminals For quick connect terminals 1 2 6 7 8 9 and 10 AMP P N 3 520406 2 or equivalent recommended Use Amp crimp tool P N 58078 3 insert 90391 3 For quick connect terminals 3 4 and 5 AMP P N 2 520405 2 or equivalent recommended Amp crimp tool P N 58078 3 insert 58079 3 A Caution FM approval
18. hing contactors motors solenoids etc use shielded thermocouple lead wire with the shield con nected at the sensor end only Use a separate thermocouple to maintain the limit function of this controller do not parallel thermocouple input from the primary control ler All wiring and fusing must conform to the National Electric Code NEC NFPA70 and any other locally applicable codes Fuse the independent load voltage on the L1 hot side and connect it to the common C side of the relay Note The model number determines the connection terminal style See below for terminal locations O1 amp N Chapter 3 Wiring A Warning Use National Electric NEC or other country specific standard wiring and safety practices when wiring and connect ing this controller to a power source and to electrical sen sors or peripheral devices Failure to do so may result in damage to equipment and property and or injury or loss of life A WARNING If high voltage is applied to a low voltage controller irrevers ible damage will occur Note Insulated terminals required for quick connect style terminals For quick connect terminals 1 2 6 7 8 9 and 10 AMP P N 3 520406 2 or equivalent recommended Use Amp crimp tool P N 58078 3 insert 90391 a For quick connect terminals 3 4 and 5 AMP P N 2 520405 2 or equivalent recommended Amp crimp tool P N 58078 3 insert 58079 3 Watlow Series L Figu
19. hnical Assistance If you encounter a problem with your Watlow controller review your configuration informa tion to verify that your selections are consistent with your application inputs outputs alarms limits etc If the problem persists you can get technical assistance from your local Watlow rep resentative see back cover by e mailing your questions to wintechsupport watlow com or by dialing 1 507 494 5656 between 7 a m and 5 p m Central Standard Time CST Ask for for an Applications Engineer Please have the following information available when calling e Complete model number e System wiring information e Series L Limit User s Manual Warranty These controllers are manufactured by ISO 9001 registered processes and are backed by a three year warranty Return Material Authorization RMA 1 Call Watlow Customer Service 507 454 5300 for a Return Material Authorization RMA number before returning any item for repair We need this information e Ship to address Bill to address e Contact name Phone number e Method of return shipment Your P O number e Detailed description of the problem Any special instructions e Name and phone number of person returning the product 2 Prior approval and an RMA number from the Customer Service Department is needed when returning any unused product for credit Make sure the RMA number is on the outside of the carton and on all paperwork returned Ship on a Fre
20. ications e Rated line voltage 50 to 60Hz 0 to 90 RH non condensing 15 minute warm up Calibration ambient range 25 C 77 F 3 C Sensor Input Thermocouple e Grounded or ungrounded e Type E J K T thermocouple types e gt 10 MO input impedance e 250 nV input referenced error per 1 source resis tance RTD e 2 wire platinum 100 Q e DIN curve 00385 curve e 125 pA nominal RTD excitation current Input Accuracy Span Range Thermocouple Input Type E 200 to 800 C or 328 to 1 470 F Type J Oto 750 C or 32 to 1 382 F Type K 200 to 1 250 C or 328 to 2 282 F Type T 200 to 350 C or 328 to 662 F RTD DIN 200 to 800 C or 328 to 1 472 F e Calibration accuracy 1 of input accuracy span 1 at standard conditions and actual calibration ambient Exception Type T 2 4 of input accuracy span for 200 to 0 C 328 to 32 F e Temperature stability 0 3 degree per degree change in ambient Watlow Series L 13 RTD Input e Calibration accuracy 1 of input accuracy span 1 at standard conditions and actual calibration ambient e Temperature stability 0 2 degree per degree change in ambient Allowable Operating Ranges Type E 200 to 800 C or 328 to 1 470 F Type J 210 to 1 038 C or 346 to 1 900 F Type K 270 to 1 370 C or 454 to 2 500 F Type T 270 to 400 C or 454to 750 F RTD DIN 200 to 800 C or 328 to 1 472 F External Reset Switch e Momenta
21. ight Prepaid basis 3 After we receive your return we will examine it and try to verify the reason for the return 4 In cases of manufacturing defect we will enter a repair order replacement order or issue credit for material returned 5 To return products that are not defective goods must be be in new condition in the origi nal boxes and they must be returned within 120 days of receipt A 20 percent restocking charge is applied for all returned stock controls and accessories 6 Ifthe unit is unrepairable it will be returned to you with a letter of explanation 7 Watlow reserves the right to charge for no trouble found NTF returns The Series L Limit user s manual is copyrighted by Watlow Winona Inc November 2006 with all rights reserved Overview Watlow s Series L family of temperature limit con trollers provide an economical limit controller solu tion for applications where thermal system protection is needed A limit controller is added to applications to pre vent over or under temperature conditions The limit provides safety assurances against instances where a thermal runaway condition occurs as a result of a failed sensor controller or output device The Series L limit controller is recommended for any application where thermal system runaway could result in large product scrap costs damage to system equipment potential fire hazard or risk to personnel All Series L limit controllers are Factory
22. l See Figure 3a DIN rail spec DIN 50022 35 mm x 7 5 mm 1 38 in x 0 30 in 2 Press down firmly on the top back edge of the DIN rail bracket and push in on the bottom front edge of the bracket The controller snaps securely onto the rail See Figure 3a If the controller does not snap on check to see if the DIN rail is bent Minimum clipping distance is 34 8 mm 1 37 in the maximum is 35 3 mm 1 39 in Removing the DIN Rail Controller 1 Remove power from the system 2 Remove all the wiring connections from the back of the controller 3 While pressing down on the top back edge of the DIN rail bracket pull forward on the bottom front edge of the DIN rail bracket See Figure 3a Removing the Controller from the DIN Rail Bracket 1 Remove power from the system 2 Remove all the wiring connections from the back of the controller Watlow Series L Spade Terminal Model 3 81 8 mm 3 22 in To install or remove press down here See Installing Removing the DIN Rail Controller procedures below 3 07 in DIN rail upper mounting clip 35 mm x 7 5 mm DIN rail is not included with the assembly Screw Terminal Model Tactile Key Model 3 Remove the DIN rail bracket from the DIN rail Insert a flat blade screwdriver between the DIN rail bracket and the case Rotate the screwdriver to release the DIN rail bracket hooks from the ridges on the case while firmly pushing the con troll
23. nt and Decrement keys The new value will take effect three seconds after the last key stroke The dis play will blink then return to the primary display after five seconds The set point value process value and offset will automatically adjust to the new temperature Chapter 4 User Interface Troubleshooting Indication On indicating limits the dis play is not illuminated Temperature reading is incor rect showing a sensor error Er ln or ALARM LED is switching at the wrong tem perature Temperature seems to be de creasing but actual process is increasing Temperature seems to be read ing low and not increasing while actual process tempera ture is increasing Temperature seems to be off set from actual process tem perature or the ALARM LED switches on at the wrong tem perature The offset changes with changes in process tem perature Watlow Series L Probable Cause s e Power supply switch off e Fuse blown e Breaker tripped e Safety interlock door switch activated e Wiring incorrect or open e Power supply voltage incorrect e Defective limit Corrective Action e Turn switch on e Replace fuse check cause of failure e Reset breaker check cause of failure e Close door e Check wiring e Verify input power e Repair or replace limit Troubleshooting thermocouple inputs e Setting for degree C or F is incorrect e Sensor or limit may be bad Sensor connections may
24. onnections All connections including extension wire must maintain the correct polarity Correct polarity problems Check thermocouple connections Check thermocouple wire insulation to make sure it is not damaged caus ing the wires to short making a new junction Check thermocouple connections Check to make sure that only thermo couple extension wire of the correct type was used to extend thermocouple leads Replace if necessary Chapter 5 Troubleshooting Indication Temperature reading is incorrect showing a sensor error Or ALARM LED is switching at the wrong temperature ALARM is not tripped when it should be ALARM LED is not on relay is energized in safe condition N O contact is closed and N C con tact is open ALARM is tripped when it should not be ALARM LED is on relay is de energized in limit condition N O contact is open and N C contact is closed Limit output signal is on when it should not be on Load LED is on Limit load is on when it should be off ALARM LED is off Watlow Series L Probable Cause s Troubleshooting RTD inputs e Setting for degree C or F is incor rect e Sensor or limit may be bad Sensor connections may be bad e Ambient temperature in the control cabinet is over 70 C 158 F e Sensor connections may be bad Ex cessive lead wire resistance Troubleshooting limit outputs e Temperature appears to be incor rect See input troubleshootin
25. out D B Series LF High Temperature Light Limit Controller LFC4JW0120AAAAA Figure 9 System Wiring Examples Watlow Series L 9 Chapter 3 Wiring lt a A Z m A A lt User Interface LED Display Indicates the limit set point SET RESET Key Press and hold key to adjust the limit set point temperature New limit set point is entered 3 seconds after the knob stops moving Press key to reset latched limit output once tempera ture is back in safe region Can also be reset through customer supplied external reset switch LV _ 1 2 50r6 __ LIMIT LV WATLOW F c ALARM Figure 10 Variable Limit Set Point Standard Interface LED Display Indicates the limit set point SET RESET Key Press and hold key to adjust the limit set point temperature New limit set point is entered 3 seconds after the last key press Press key to reset latched limit output once temperature is back in safe region Can also be reset through customer supplied external reset switch LV_ A B CorD ______ S LIMIT LV A F or C Indicator Light Lit to indicate if unit is configured for degrees Fahrenheit or degrees Celsius ALARM Indicator Light Lit when limit is tripped Finger Tip Indent Insert finger tip into indent for quick and easy set point changes Limit Set Point Knob To increase limit set point turn knob clockwise To decre
26. p external manual reset on over temperature W High Limit Auto reset on power up external manual reset on over tem perature Y Low Limit External manual reset on power up external manual reset on under temperature Z Low Limit Auto reset on power up external manual reset on under tem perature Fixed Limit Set Point Value XXXX Limit Set Point Value Overlay Custom Option A Standard Note Limit set point must fall within the sensor operating range Note A is used in the left digit of the operating range to indicate negative values Watlow Series L 15 Appendix Ordering Information and Model Numbers Limit Control LED display V front panel reset switch Set Point Type V Variable Limit Set Point Line Voltage C 120V ac E 230 to 240V ac G 24V ac Controller Package 1 Panel Mount Square 1 8 DIN Rotary Knob Spade Terminals 2 DIN Rail Mount Rotary Knob Spade Terminals 5 Panel Mount Square 1 8 DIN Rotary Knob Screw Terminals 6 DIN Rail Mount Rotary Knob Screw Terminals A NEMA 4X 1P65 Panel Mount Tactile Keys Spade Terms B DIN rail Mount Tactile Keys Spade Terminals C NEMA 4X IP65 Panel Mount Tactile Keys Screw Terms D DIN rail mount Tactile Keys Screw Terminals Sensor and Sensor Operating Range H Type J 346 to 1 900 F J Type J 210 to 1 038 C K Type K 454 to 2 500 F L Type K 270 to 1 370 C M Type T 454 to 750 F N Type T 270 to 400 C P 100 O RTD
27. re 7a AC Power Wiring e Nominal voltage options e 24V ac e 120V ac e 230 to 240V ac Figure 7b Thermocouple Input Thermocouples are polarity sensitive The negative lead usually red must be connected to the negative thermocouple terminal e Input impedance gt 10 MO Figure 7c RTD Input 100 Q Platinum DIN curve 0 00385 Q 0 C e Terminals S2 and S3 must be shorted for a two wire RTD e Nominal excitation current 125 pA 3 Wire RTD 2 Wire RTD RTD S1 RTD S1 5 ase Sapos RTD S3 S3 w No lead resistance compensation 7 Chapter 3 Wiring A Warning Use National Electric NEC or other country specific standard wiring and safety practices when wiring and connecting this controller to a power source and to electrical sensors or peripheral de vices Failure to do so may result in damage to equip ment and property and or injury or loss of life Note Use of an external reset switch may affect FM ap proval Only the use of a momentary N O switch is valid for approval Note Insulated terminals re quired for quick connect style terminals For quick connect termi nals 1 2 6 7 8 9 and 10 AMP P N 3 520406 2 or equivalent recommend ed Use Amp crimp tool P N 58078 3 insert 90391 3 For quick connect termi nals 3 4 and 5 AMP P N 2 520405 2 or equivalent recommended Amp crimp tool P N 58078 3 insert 58079 3 Quencharc Note Swi
28. requires limit switches to be suitably en closed to restrict casual user adjustment Watlow Series L The terminals on the back of the Series L limits are the same for all of the package styles They are 6 3 mm 0 25 in quick connect push on style ter minals or removable screw terminal block The terminal style is an ordering option Check the part number to determine your hardware configuration Refer to the wiring diagrams appropriate for your controller s configuration All outputs are referenced to a de energized state Wiring Guidelines 1 Use the correct thermocouple type per the model number on the case sticker of the unit See dimension drawings for sticker locations e Use correct thermocouple polarity Red is usually negative e If you must extend thermocouple leads use thermocouple extension wire to minimize errors e Be sure you have good crimp connections on all wire connections e Insulate the thermocouple mounting from the mounting surface to prevent heat migration input errors e Thermocouple leads should be routed separately from any high volt age lines e Long lead lengths create electrical resistance When using a two wire RTD there will be an additional 2 6 C 4 7 F error for every 10 of lead length resistance That resistance when added to the resistance of the RTD element can result in erroneous input to the temperature control ler In electrically noisy environments heavy switc
29. ry dry contact closure See wiring section Output Types Electromechanical Relay Form C e Minimum load current 100 mA e 8A 240V ac or 30V dc maximum resistive e 250 VA pilot duty 120 240V ac maximum in ductive e Use RC suppression for inductive loads e Electrical life 100 000 cycles at rated current Agency Approvals Series LF potted version only e UL 991 recognized temperature limit for food ser vice industry Series LV and Series LF including potted version e UL 873 recognized temperature regulator File 43684 e UL 197 reviewed for use in food service appliances e ANSI Z21 23 Gas appliance thermostat approval e CSA C22 2 24 approved temperature control File 30586 e FM Class 3545 temperature limit switches File 3017239 e NEMA 4X IP65 on panel mount versions with tac tile keys for set point adjustment e CE see Declaration of Conformity Terminals e 6 4 mm 0 25 in quick connect push on termi nals See order options Refer to Wiring section for crimp on terminal recommendations e Removable screw clamp style terminal blocks See order options e Wire gauge 0 1 to 4 mm 30 to 12 AWG Strip length 8 mm 0 30 in e Torque 0 8 Nm 7 in lb maximum Appendix Power Glossary e 24V ac 10 15 50 60 Hz 5 t _ Af a lathine limi e 120V ac 10 15 50 60 Hz 5 automat c power reset eature in latching limi e 208 to 240V ac 10 Series L
30. tching pilot duty loads relay coils solenoids etc with the mechanical relay output option requires use of an R C suppressor Watlow carries the R C suppressor Quencharc brand name which is a trademark of ITW Paktron Watlow Part No 0804 0147 0000 Watlow Series L Figure 8a External Reset Switch e Momentary normally open N O dry contact closure Momentary N O Switch customer supplied Figure 8b Mechanical Relay Output e Form C contacts e 8A resistive e 250 VA pilot duty 120 240V ac inductive e 240V ac maximum e 30V dc maximum e See Quencharc note e For use with ac or dc e Minimum load current 100 mA e Output does not supply power Customer supplied Quencharc for pilot duty inductive loads only See note External gr NOt Normally Open Ld oe 7 a Common 3 Chapter 3 Wiring System Wiring Examples Power Disconnect Switch L1 120V ac L2 Customer Supplied Quencharc 4 High Limit Mechanical Contactor Not used Reset Switch customer supplied L SSR 240 10A DC1 Solid State Relay Series CV O Temperature Controller CVB1JH00000100C Heater ma Series LF Process Sensor Limit Sensor ini Conti LFC4JW0120AAAAA 120V 0 G ac L2 Series CV Temperature Controller Power Disconnect CVB1JHO0000100C Switch 6 3t032 SSR 240 10A DC1 V dc in Solid State Relay 48 to 260 V
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