1. DL manuals
  2. Watlow Electric
  3. Temperature Controller
  4. 935A Series
  5. User Manual

Watlow Electric 935A Series User Manual

Manual is about: Temperature Controller with Countdown Timer

Summary of 935A Series

  • Page 1

    0600-0015-0000 rev l $15.00 january 2002 supersedes: 0600-0015-0000 rev k user’s manual registered company winona, minnesota usa total 3 year warranty customer satisfaction series 935a temperature controller with countdown timer 1241 bundy boulevard, p.O. Box 5580, winona, minnesota usa 55987-5580 p...

  • Page 2: Technical Assistance

    Safety information in this manual note, caution and warning symbols appear 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 import...

  • Page 3: Where to Find It…

    Watlow series 935a user’s manual 1 where to find it… table of contents item ............................................................. Page introduction ........................................................ 2 how keys work ................................................. 4 begin controlling ....

  • Page 4: Introduction

    2 watlow series 935a user’s manual welcome to the watlow series 935a! General description the series 935a is a temperature controller with countdown timer for industrial, commercial, or scientific applications. It offers 1/32 din panel-mounting, digital indication, single temperature sensor input fr...

  • Page 5

    Watlow series 935a user’s manual 3 output 1 output 2 rdy 2 1 set single input dual output single input type j, k, t, n, s, e thermocouple, 1° rtd, or 0.1° rtd output 1 switched dc heat cool alarm remote set point set front panel lockout none none heat cool alarm 30 15 45 0 timer (hr:min or min:sec) ...

  • Page 6: Read Or Change

    4 watlow series 935a user’s manual read or change you can simply: • read the normally displayed actual temperature, or… • press and hold ß to read the set point, or… 1. Press and hold . And , simultaneously for three seconds to move to a software menu. 2. Press and hold ß to display a choice or valu...

  • Page 7

    Rdy 2 1 set seven-segment alphanumeric display: • shows process value, set point information, time, or • shows prompt name or value, depending on the key combination pressed. Set key: ß • configurable to shift between normally-displayed value and set values. See [disp] , p.16. • clears a latched ala...

  • Page 8: Begin Controlling

    6 watlow series 935a user’s manual begin controlling 1. Apply power to the system. A properly-wired series 935a will begin controlling the thermal system as soon as you apply power to it. 2. Look at the series 935a’s display. It is reading actual temperature, set point temperature, or time. • to cha...

  • Page 9: Change Set Point

    Watlow series 935a user’s manual 7 change set point rdy 2 1 set your series 935a displays the actual process temperature when it comes from the factory. You can change it to normally display the set point or time. Go to p. 16, see [disp] . 1. Press and hold ß . 2. Press one of the arrow keys to alte...

  • Page 10: Respond to A Simple Error

    8 watlow series 935a user’s manual respond to a simple error display probable cause recommended action reversed thermo- change the sensor couple connection leads on terminals + to –. 1 and 2. Sensor type go to {`in} prompt, check mismatch selection (see p. 20), or check or open rtd. Rtd, replace as ...

  • Page 11: Learn The Software Map

    Watlow series 935a user’s manual 9 software organization • the series 935a has three primary menus in addition to a normal display. • the software reverts to the normal display after 60 ± 5 sec. Table 3 - software organization • at the [`pid] or [cnfg] prompt, press and hold the ß key, and the . Or ...

  • Page 12: Learn The Operations Menu

    1 0 watlow series 935a user’s manual the series 935a operations menu is the first menu you encounter when you press the . And , keys simultaneously for three seconds. The operations menu provides a location to initiate the following actions or complete the following tasks: • auto-tune [`aut] : start...

  • Page 13

    Watlow series 935a user’s manual 1 1 table 4 - operations menu overview to enter the operations menu, press the . And , keys simultaneously for three seconds. Auto-tune - start the auto-tune action to automatically select a set of viable pid values; [tune] will flash during auto-tuning. [``no] [`yes...

  • Page 14: Learn The Pid Menu

    1 2 watlow series 935a user’s manual choose the pid strategy you may rely solely on the auto-tune [`aut] function (p. 32) and factory defaults to determine pid values for your system, or you may use auto-tuning and additional manual adjustments. You must select dead band [``db] and calibration offse...

  • Page 15

    Watlow series 935a user’s manual 1 3 set the pid menu values • proportional band, heat and cool [pb`h] and [pb`c] : select a value (degrees) to set up band on either side (±) of the primary set point in which the heat and/or cool proportioning function(s) will be active. For on/off control, set [pb`...

  • Page 16: Learn The Pid Menu - Details

    1 4 watlow series 935a user’s manual table 5 - pid menu overview set-up heat proportional band heat - select a heat proportional band value. [```0 ] [`999] [```0] [`555] [``)0] [99(0] [``)0] [55%0] 0°f to 999°f, or 0°c to 555°c, or 0.0°f to 999.0°f, or 0.0°c to 555.0°c hysteresis heat - select a hea...

  • Page 17

    Watlow series 935a user’s manual 1 5 set-up general integral function - select an integral value. [`)00] [9(99] 0.00 to 99.99 minutes/repeat derivative function - select a derivative value. [`)00] [`(99 0.00 to 9.99 minutes calibration offset - select a calibration offset value. [-999]] [9999] [-9(9...

  • Page 18: Learn The Configuration Menu

    1 6 watlow series 935a user’s manual the configuration menu is the second sub-menu in the operations menu. Use it to set inputs, ranges, output types, alarms, timer, failure mode, and lockouts. To go to the configuration menu: 1. Go first to the operations menu by pressing . And , simultaneously for...

  • Page 19

    Watlow series 935a user’s manual 1 7 note: access to configuration menu varies with lockout function. See p. 19. Alarm hysteresis - choose alarm switching band. [```1[ [`999] [```1] [`555] [``)1] [99(0] [``)1] [55%0] 1°f to 999°f, or 1°c to 555°c, or 0.1°f to 999.0°f, or 0.1°c to 555.0°c alarm latch...

  • Page 20: Using Lockout Functions

    1 8 watlow series 935a user’s manual the series 935a offers three different security, or “lockout,” options. Set up one or all three lockout op- tions in the configuration menu. ∫ • front panel lock [`fpl] uses a control output as an input for an external hardware switch; it requires wiring, see p. ...

  • Page 21

    Watlow series 935a user’s manual 1 9 view process yes yes yes yes yes yes yes view set point yes yes yes yes yes yes yes change set point no yes no yes yes yes yes auto-tune no yes yes yes yes yes no view, change operation menu no yes yes yes yes no yes view, change configuration menu (except tag) n...

  • Page 22: Setting Inputs and Outputs

    2 0 watlow series 935a user’s manual setting inputs and outputs key input/output set-up information • all initial input and output set-up occurs in the configuration menu. • the 935a requires a thermocouple or rtd input connection to the s1 and s2 terminals, including when using the remote set point...

  • Page 23

    Watlow series 935a user’s manual 2 1 input range information j t/c: 32 to 1382°f or 0 to 750°c k t/c: -328 to 2282°f or -200 to 1250°c t t/c: -328 to 662°f or -200 to 350°c n t/c: 32 to 2282°f or 0 to 1250°c s t/c: 32 to 2642°f or 0 to 1450°c e t/c: -328 to 1470°f or -200 to 799°c 1° rtd (din): -328...

  • Page 24

    2 2 watlow series 935a user’s manual to set up remote set point… 1. Wire the control per the example below and the information on p. 42-45. 2. Go to [cnfg] , make [`in] and [`c_f] choices, then 3. Make [``in] and [`c_f] choices, then 4. Scale the 0-5v Î (dc) input with [``rl] and [``rh] . 5. Go to [...

  • Page 25: Set Up Front Panel Lockout

    Watlow series 935a user’s manual 2 3 to set up front panel lock… 1. Install an external switch. 2. Wire the control per the example below and the information on p. 42-45. 3. Go to [cnfg] , then [`ot1] , and choose [`fpl] . Table 9 - using front panel lock figure 6 - front panel lock wiring see p. 43...

  • Page 26: Learning Alarms

    2 4 watlow series 935a user’s manual configuration menu [``in] input type [`c_f] celsius/fahrenheit [``rl] input range low [``rh] input range high [`ot1] output 1 function [`ot2] output 2 function [disp] display default [alty] ✓ alarm type [ahys] ✓ alarm hysteresis [`lat] ✓ alarm latch [`sil] ✓ alar...

  • Page 27

    Watlow series 935a user’s manual 2 5 table 10 - alarm functions set point deviation normally closed deviation normally open process normally closed process normally open non-alarm state led off alarm output: alarm state led on alarm output status: function a deviation alarm tracks set point. A proce...

  • Page 28: Setting Alarms

    2 6 watlow series 935a user’s manual 1. Plan an alarm strategy. What do you want to happen when an alarm occurs? 2. Wire the appropriate control output, output 1 or output 2, and associated switching and annuncia- tors. See p. 42-45 for wiring information. 3. Go to the 935a’s configuration menu [cnf...

  • Page 29

    Table 11 (below) and table 10 (p. 25) illustrate the series 935a alarm features. Table 11 - alarm functions set latching alarm silence alarm with this selection, an alarm cannot be silenced at the 935a front panel (unless the alarm is latched [ [~lat] = [yes] ], and the alarm condition no longer exi...

  • Page 30: Learn The Countdown Timer

    2 8 watlow series 935a user’s manual configuration menu [``in] input type [`c_f] celsius/fahrenheit [``rl] input range low [``rh] input range high [`ot1] output 1 function [`ot2] ✓ output 2 function [disp] ✓ display default [alty] alarm type [ahys] alarm hysteresis • • • [tim] ✓ timer function [strt...

  • Page 31

    Watlow series 935a user’s manual 2 9 table 12 - series 935a timer functions/settings delay on delay off signal on signal off output 2 timer output function; choose one of four possible output actions for the end of the timer / time periods. Sp rdy rdy rdy • = 0, disables ready feature. • the rdy fro...

  • Page 32: Setting The Countdown Timer

    3 0 watlow series 935a user’s manual 30 15 45 0 1. Plan a timer strategy. 2. Wire the output 2 control output, associated switching devices and annunciators. See p. 42-45. 3. Go to the 935a’s configuration menu [cnfg] . 4. Choose the output 2 [`ot2] function as time; hrs:min [thm] , or time; min:sec...

  • Page 33: Timer Example

    Watlow series 935a user’s manual 3 1 30 15 45 0 convection oven application scenario a master chef bakes bread at 350°f for 30 minutes. He wants the oven at the proper temperature with an indication when it is ready to begin baking. He isn't concerned if the oven is 10° cool at first. After he loads...

  • Page 34: Auto-Tuning

    Auto-tuning auto-tune automatically sets pid parameters for your system. 1. Press . And , for three seconds. 2. You'll see [`aut] . 3. Press and hold ß , then select [`yes] with . Or , . [tune] will flash to indicate auto-tun- ing. Display reverts to normal after auto-tuning. 4. [`aut] = [``no] stop...

  • Page 35: Fine Tune The Pid Settings

    Watlow series 935a user’s manual 3 3 fine tune the pid settings 1. Set [pb`h] and [ct`h] in degrees. 2. If proportional band heat [pb`h] = 0, set hysteresis heat [hysh] . The series 935a will provide on/off control with the hysteresis value selected, and no proportioning action. 3. Proportional band...

  • Page 36: Calibrating The 935A

    3 4 watlow series 935a user’s manual calibrating the 935a calibration requires a precision millivolt source with thermocouple compensation, an adjustable 0-10 volt source, and a decade resistance box. • [tr50] and [tr00] calibrate the thermocouple span. • [``tc] calibrates the ambient compensation. ...

  • Page 37

    Watlow series 935a user’s manual 3 5 thermocouple and remote set point input field calibration procedure equipment required: • type “j” reference compensator with reference junction at 32°f/0°c, or type “j” thermocouple calibrator set at 32°f/0°c. • precision millivolt source, 0-50mv min. Range, 0.0...

  • Page 38: Errors and Troubleshooting

    3 6 watlow series 935a user’s manual errors and troubleshooting set up an input failure operation mode at the [fail] prompt in the [cnfg] menu; choose bumpless transfer [bpls] for smooth output action transition to percent power control, or select a percent power output value. [fail} [bpls] bumpless...

  • Page 39

    Watlow series 935a user’s manual 3 7 to troubleshoot sensor • remove sensor wires from terminals 1 and 2. • for a thermocouple sensor series 935a, place a jumper wire on terminals 1 and 2. Control should display the ambient temperature at the back of the control. • for an rtd sensor series 935a, pla...

  • Page 40: Mounting

    3 8 watlow series 935a user’s manual mounting 22.2mm (0.874 in.) +0.3mm, -0.0mm (+0.012 in., -0.000 in.) 12.7mm (0.500 in.) 12.7mm (0.500 in.) 57.7mm (2.272 in.) 34.9mm (1.374 in.) 45.0mm (1.772 in.) (+0.024 in., -0.000 in.) +0.6mm, -0.0mm layout for four 1/32 din knockouts with punch and die figure...

  • Page 41: Dimensions

    Watlow series 935a user’s manual 3 9 dimensions figure 11- series 935a dimensions 53.1mm (2.09 in.) 29.0mm (1.14 in.) panel cutout 44.96mm 101.6mm (4.00 in.) 12.7mm (0.50 in.) maximum overall depth 114.3mm (4.50 in.) panel thickness 1.5mm to 9.7mm (0.060 to 0.38 in.) 22.10mm (0.870 in.) (1.770 in.) ...

  • Page 42: Installation Procedure

    4 0 watlow series 935a user’s manual installation procedure 1. Make a panel cutout using the dimensions in figure 9, p. 38. 2. Insert the 935a into the cutout. Check to see that the gasket is not twisted. Make sure the rounded side of the d-shaped external case gasket faces the panel surface, and th...

  • Page 43: Terminal Block Removal

    Figure 14- terminal block removal procedure 1. Press in on sides of cover to release the terminal cover hooks. 2. Move your grip rearward slightly, then lift the terminal cover straight up. Watlow series 935a user’s manual 4 1 terminal block removal.

  • Page 44: Wiring A 935A

    4 2 watlow series 935a user’s manual wiring a 935a figure 15 - wiring the series 935a ∫ warning: all electrical wiring and fusing must conform to local and national electric codes. Contact local authorities for further information. Failure to comply with electric codes could result in injury or deat...

  • Page 45

    Watlow series 935a user’s manual 4 3 ∫ warning: all electrical wiring and fusing must conform to local and national electric codes. Contact local authorities for further information. Failure to comply with electric codes could result in injury or death, or damage to property. ç caution: failure to i...

  • Page 46: System Wiring Examples

    4 4 watlow series 935a user’s manual system wiring examples figure 16 - series 935a system wiring examples ∫ warning: all electrical wiring and fusing must conform to local and national electric codes. Contact local authorities for further information. Failure to comply with electric codes could res...

  • Page 47

    Watlow series 935a user’s manual 4 5 figure 17 - series 935a ladder diagram wiring example ∫ warning: all electrical wiring and fusing must conform to local and national electric codes. Contact local authorities for further information. Failure to comply with electric codes could result in injury or...

  • Page 48: Glossary

    4 6 watlow series 935a user’s manual glossary alarm a condition, generated by the controller, indicating that the pro- cess has exceeded or fallen below the set or limit point. Alarm hysteresis a change in the process variable required to re-energize the alarm output. Ambient temperature temperature...

  • Page 49

    Watlow series 935a user’s manual 4 7 ready acknowledge a series 935a countdown timer start choice that pre-initiates the timer with a down key press, and then starts it with a set press when the actual temperature is within the ready ready band thermal area above and below primary set point in which...

  • Page 50: Index

    4 8 watlow series 935a user’s manual index a auto-tune [`aut] 10, 32 alarms alarm high [`ahi] 10, 24 alarm low [`alo] 10, 24 alarm type [alty] 24 clearing alarms 26, 27 deviation [denc] , [deno] 24 hysteresis [ahys] 24 latch [`lat] 24 learning 24 process [prnc] , [prno] 24 setting 26 silencing [`sil...

  • Page 51

    Watlow series 935a user’s manual 4 9 s set point change 7 local [`l-r] 10 lock [sloc] 18 range high [``rh] 20 range low [``rl] 20 remote set point [`rsp] 22 remote [`l-r] 22 silencing alarms 27 software maps easy 9 advanced 55-62 specifications 50 t terminal block removal 41 timer countdown [tmr] 10...

  • Page 52: Specifications

    5 0 watlow series 935a user’s manual specifications specifications (2191) control mode • auto-tune pid. • pid, pd, pi, on/off. • countdown timer; hours:minutes, minutes:seconds. • timer output modes; delay-off, delay-on, signal-off, signal-on. Agency approvals • ul/c-ul 508 listed, file #e102269. • ...

  • Page 53: Ordering A 935A

    Watlow series 935a user’s manual 5 1 ordering a 935a ordering information (2192) single thermocouple or rtd (din) input, dual output, singlie display temperature control with time function and four digit display remote inputs a = remote set point input, or front panel lock input in place of output #...

  • Page 54: Declaration of Conformity

    5 2 watlow series 935a user’s manual declaration of conformity series 935 watlow winona, inc. 1241 bundy boulevard winona, minnesota 55987 usa declares that the following product: english designation: series 935 model numbers: 935(a or b) – 1c(c, d or k)(0 or 1) – (any four letters or numbers) class...

  • Page 55: Notes

    Watlow series 935a user’s manual 5 3 notes.

  • Page 56: Notes

    5 4 watlow series 935a user’s manual notes.

  • Page 57: 935A Software Map

    Watlow series 935a user’s manual 5 5 935a software map operations menu prompt range default hidden if * your settings *note: all prompts, except [``sp] and [`tag], are hidden if [`ot1] = [`fpl]. [`ta9] = [`o``]; or if [`ot2] ≠ [thm] or [tms] [trac] [trac] [``rl] [``rh] choose an idle set point. Trac...

  • Page 58

    5 6 watlow series 935a user’s manual operations menu prompt range default hidden if * your settings [`ta9] = [p```]; or if [pb`h] ≠ 0 3°f or 2°c [```1] [`999] [```1] [`555] [``)1] [99(0] [``)1] [55%0] select a value in whole degrees (1°f to 999°f or 1°c to 555°c) or in tenths of degrees (0.1°f to 99...

  • Page 59

    Watlow series 935a user’s manual 5 7 pid menu prompt range default hidden if * your settings [`ta9] = [p```]; or if [pb`c] ≠ 0 3°f or 2°c [```1] [`999] [```1] [`555] [``)1] [99(0] [``)1] [55%0] select a value in whole degrees (1°f to 999°f or 1°c to 555°c) or in tenths of degrees (0.1°f to 999.0°f o...

  • Page 60

    5 8 watlow series 935a user’s manual pid menu prompt range default hidden if * your settings [`ta9] = [p```] 0°f or 0°c [-999] [9999] [-9(9] [99(9] select a value, adjustable between -999° and 9999°f or c or -99.9° and 999.9°f or c to eliminate a difference between the displayed temperature and the ...

  • Page 61

    Watlow series 935a user’s manual 5 9 configuration menu prompt range default hidden if * your settings [`ta9] = [``c`] heat [heat] [cool] [alm] [`rsp] [`fpl] [none] choose heat, cool, alarm, remote set point, front panel lock or no output action. [`ot1] output 1 function [`ta9] = [``c`] type j range...

  • Page 62

    6 0 watlow series 935a user’s manual configuration menu prompt range default hidden if * your settings [`ta9] = [``c`]; or if [`ot1] and/or [`ot2] ≠ [alm] 3°f or 2°c [```1] [`999] [```1] [`555] [``)1] [99(0] [``)1] [55%0] select a value in whole degrees (1°f to 999°f or 1°c to 555°c) or in tenths of...

  • Page 63

    Watlow series 935a user’s manual 6 1 configuration menu prompt range default hidden if * your settings [`ta9] = [``c`]; or if [`ot2] ≠ [thm] or [tms] 0°f or 0°c [```0] [`999] [```0] [`555] [``)0] [99(0] [``)0] [55%0] if [strt] = [rdya] or [`rdy], then select a value in whole degrees (0°f to 999°f or...

  • Page 64

    6 2 watlow series 935a user’s manual configuration menu prompt range default hidden if * your settings always appears p [pcoa] [`coa] [pco`] [`co`] [pc`a] [`c`a] [pc``] [`c``] [p`oa] [``oa] [p`o`] [``o`] [p`a`] [```a] [p```] [````] choose the menus/functions that will not be displayed, and therefore...

  • Page 65: Notes

    Watlow series 935a user’s manual 6 3 notes.

  • Page 66: Notes

    6 4 watlow series 935a user’s manual notes.

  • Page 67: About Watlow Winona

    About watlow winona watlow winona is a u.S. Division of watlow electric manufacturing company, st. Louis, missouri, a manufacturer of industrial electric heating products since 1922. Watlow products include electric heaters, sensors, controllers and switching devices. The winona operation has been d...

  • Page 68: How to Reach Us

    How to reach us quality and mission statement: watlow winona will be the world’s best supplier of superior measurement and control products, services, and systems, by exceeding the expectations of our customers, shareholders, and employees. Europe: watlow gmbh industriegebiet heidig lauchwasenstr. 1...