Table of Contents
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Series 935A
User's Manual
Temperature Controller
with Countdown Timer
TOTAL
CUSTOMER
SATISFACTION
3 Y ear Warranty
Registered Company
Winona, Minnesota USA
1241 Bundy Boulevard, P.O. Box 5580, Winona, Minnesota USA 55987-5580
U.S. English
Phone: +1 (507) 454-5300, Fax: +1 (507) 452-4507, http://www.watlow.com
0600-0015-0000 Rev L
$15.00
January 2002
Supersedes: 0600-0015-0000 Rev K
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Table of Contents
Troubleshooting
Related Manuals for Watlow Electric 935A Series
Summary of Contents for Watlow Electric 935A Series
- Page 1 Series 935A User’s Manual Temperature Controller with Countdown Timer TOTAL CUSTOMER SATISFACTION 3 Y ear Warranty Registered Company Winona, Minnesota USA 1241 Bundy Boulevard, P.O. Box 5580, Winona, Minnesota USA 55987-5580 U.S. English Phone: +1 (507) 454-5300, Fax: +1 (507) 452-4507, http://www.watlow.com 0600-0015-0000 Rev L $15.00 January 2002...
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Page 2: Your Comments
ç Safety Information in this Manual Note, caution and warning symbols appear throughout this book to draw your attention to important operational and safety information. Safety Alert A “NOTE” marks a short message to alert you to an important detail. CAUTION or A “CAUTION”... -
Page 3: Table Of Contents
Where to find it… Table of Contents Table Numbers ..........Page 1 Output Functions ........3 Item ............. Page 2 Error Messages and Action ...... 8 Introduction ............2 3 Software Organization ......9 How Keys Work ..........4 4 Operations Menu Overview ....11 Begin Controlling .......... -
Page 4: Introduction
Introduction 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 from a thermocouple or RTD, and dual control outputs. Outputs may operate in combinations of heat or cool, and alarm or timer. -
Page 5: Output Functions
Figure 1 - Series 935A Input and Output Overview O u t p u t 1 S in g le R D Y In p u t O u t p u t 2 S E T Dual Output Single Input Type J, K, T, N, S, E Thermocouple, 1°... - Page 6 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 simultaneously for three seconds to move to a software menu. 2. Press and hold ß...
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Page 7: Front Panel Functions
Figure 2 - Series 935A Front Panel Functions Seven-segment LED 1: alphanumeric display: Lit when Output 1 is active. • Shows process value, set point information, time, or • Shows prompt name or value, LED 2: depending on the key combination pressed. -
Page 8: Begin Controlling
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. •... -
Page 9: Changing The Set Point
Change Set Point 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. -
Page 10: Troubleshooting
Respond to a simple error If You See An Error Code: 1. Be aware that most errors are input (sensor) related. 2. Read the table below and follow its recommendations. Table 2 - Error messages and recommended action Display Probable Cause Recommended Action Reversed thermo- Change the sensor... -
Page 11: Pid Menu; Learn
Learn the Software Map 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 Display Actual Temperature, Set Point, or Time Remaining •... - Page 12 Learn the Operations Menu The Series 935A Operations Menu is the first menu you encounter when you press the keys simultaneously for three seconds. The Operations Menu provides a location to initiate the following actions or complete the following tasks: •...
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Page 13: Operations Menu Overview
Table 4 - Operations Menu Overview To enter the Operations Menu, press the keys simultaneously for three seconds. Auto-tune - Start the auto-tune action to automatically select a set of viable PID values; will flash during auto-tuning. Alarm Low - Select a low alarm point, adjustable between Off, Range Low and Alarm High. Alarm High Alarm High - Select a high alarm point, adjustable between Alarm Low and Range High, or OFF. - Page 14 Learn the PID Menu Choose the PID Strategy You may rely solely on the Auto-tune 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 and calibration offset values manu- ally.
- Page 15 Set the PID Menu Values • Proportional Band, Heat and Cool : 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 = 0.
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Page 16: Pid Menu Overview
Learn the PID Menu - Details Table 5 - PID Menu Overview Set-Up Heat Proportional Band Heat - Select a heat proportional band value. 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 heat ON/off control switching hysteresis. 1°F to 999°F, or 1°C to 555°C, or 0.1°F to 999.0°F, or... - Page 17 Set-Up General Integral Function - Select an integral value. 0.00 to 99.99 minutes/repeat Derivative Function - Select a derivative value. 0.00 to 9.99 minutes Calibration Offset - Select a calibration offset value. -999° to 9999°F or C or -99.9° to 999.9°F or C Note: Access to the PID Menu and the prompts there varies with lockout function and output set-up.
- Page 18 Learn the Configuration Menu 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: Go first to the Operations Menu by pressing simultaneously for three seconds.
- Page 19 NOTE: Access to Configuration Menu varies with lockout function. See p. 19. Alarm Hysteresis - Choose alarm switching band. 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 - Choose latching or non-latching alarms. A latching alarm requires a press to clear it after the alarm condition clears.
- Page 20 Using Lockout Functions The Series 935A offers three different security, or “lockout,” options. Set up one or all three lockout op- Configuration Menu tions in the Configuration Menu. Input Type Celsius/Fahrenheit • Front Panel Lock uses a control output as an input for an external hardware switch; it Input Range Low requires wiring, see p.
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Page 21: Set Point Change
Table 7 - Series 935A Lockout Options Three = No Lockout Lockout Options = Fully Locked = Operator's Perspective Front Panel Lockout Set Point Lockout Security Tag View Process View Set Point Change Set Point Auto-tune View, Change Operation Menu View, Change Configuration Menu (except tag) View, Change PID... -
Page 22: Setting Up Inputs And Outputs
Setting Inputs and Outputs Configuration Menu Key Input/Output Set-up Information • All initial input and output set-up occurs in the Configuration Menu. Input Type • The 935A requires a thermocouple or RTD input connection to the S1 and S2 Terminals, including when using the remote set point option. -
Page 23: Setting Inputs And Outputs
Note: Access to Configuration Menu varies with lockout function. See p. 19. Table 8 - Setting Inputs and Outputs Input Type - Choose sensor type. J t/c K t/c T t/c N t/c E t/c S t/c 1.0° RTD 0.1° RTD Input Range Information J t/c: 1382°F... -
Page 24: Remote Set Point Wiring
Set Up Remote Set Point Input Configuration Menu To Set Up Remote Set Point… Wire the control per the example below and the information on p. 42-45. Input Type Go to , make choices, then Make choices, then Celsius/Fahrenheit Scale the 0-5V (dc) input with Input Range Low Go to , and choose... -
Page 25: Using Front Panel Lock
Set Up Front Panel Lockout Configuration Menu To Set Up Front Panel Lock… Install an external switch. Input Type Wire the control per the example below and the information on p. 42-45. Go to , then , and choose Celsius/Fahrenheit Table 9 - Using Front Panel Lock Input Range Low Input Range High... - Page 26 Learning Alarms Configuration Menu Alarms signal an excursion from normal operating conditions. In general, audible alarms or lights connected to alarm outputs will signal a problem. In the 935A the front panel LED “1” or “2” indicates an alarm with flashing on the main display.
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Page 27: Alarm Functions
Table 10 - Alarm Functions Deviation Alarm Process Alarm Deviation Deviation Process Process normally normally normally normally Alarm Type open closed open closed Non-Alarm State LED off Alarm Output: Alarm State LED on Alarm Output Status: Silenced-Alarm State LED off Alarm Output Status: Power-Off State LED off... - Page 28 Setting Alarms Configuration Menu Plan an alarm strategy. What do you want to happen when an alarm occurs? Wire the appropriate control output, Output 1 or Output 2, and associated switching and annuncia- tors. See p. 42-45 for wiring information. Input Type Go to the 935A’s Configuration Menu .
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Page 29: Front Panel Lockout
Table 11 (below) and Table 10 (p. 25) illustrate the Series 935A alarm features. Table 11 - Alarm Functions S E T A latched alarm requires the Latching alarm operator to press the An unlatched alarm self-clears key to clear after the actual when actual temperature returns temperature returns to within to within the safe area. - Page 30 Learn the Countdown Timer • The timer requires Output 1 to work as either a heat or as a cool output. Configuration Menu • The 935A timer is a function of Output 2, which, depending on your unit’s model number, can be ei- ther switched dc, electromechanical relay, or solid state relay.
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Page 31: Timer Functions/Settings
Table 12 - Series 935A Timer Functions/Settings Configuration Menu Timer set-up available only when Choose time in hr:min or min:sec. Delay ON Delay OFF Signal ON Signal OFF Output 2 Timer Output Function; Choose one of four Output 2 is Output 2 is Output 2 is Output 2 is... -
Page 32: Timer; Setting
Setting the Countdown Timer Configuration Menu Plan a timer strategy. Wire the Output 2 control output, associated switching devices and annunciators. See p. 42-45. Input Type Go to the 935A’s Configuration Menu Choose the Output 2 function as time; hrs:min , or time;... -
Page 33: Timer Example
Timer Example 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 the oven, the chef wants to start the countdown time by pressing a key. -
Page 34: Auto-Tuning
Auto-tuning Operations Menu Auto-tuning Auto-tune automatically sets PID parameters for your system. Auto-tune Press for three seconds. You'll see Alarm Range Low Press and hold , then select with will flash to indicate auto-tun- ing. Display reverts to normal after auto-tuning. Alarm Range High stops auto-tuning. - Page 35 Fine Tune the PID Settings PID Menu 1. Set [Pb`h] [Ct`h] in degrees. 2. If Proportional Band Heat [Pb`h] = 0, Set Hysteresis Heat [HySh]. The Series 935A will provide on/off Set up Heat: control with the hysteresis value selected, and no proportioning action. [Pb`h] 3.
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Page 36: Calibrating
Calibrating the 935A Calibration Menu Calibration requires a precision millivolt source with thermocouple compensation, an adjustable 0-10 volt source, [tc50] and a decade resistance box. tc50 • [tr50] [tr00] calibrate the thermocouple span. [tc00] • [``tc] calibrates the ambient compensation. tc00 •... - Page 37 Calibrating the 935A and Remote Set Point Input 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, 0.01mV resolution. Set Up: 1.
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Page 38: Errors And Troubleshooting
Errors and Troubleshooting Configuration Menu Set up an input failure operation mode at the [FAIL] prompt in the [CnFG] menu; choose bumpless [``In] transfer [bPLS] for smooth output action transition to percent power control, or select a percent power output value. Input Type [FAIL} [`C_F]... -
Page 39: Error Codes And Actions
Table 13 - Error Codes and Actions Display Probable Cause Recommended Action Reversed thermocouple Change the sensor [`Er1] connection + to –. leads on Terminals 1 and 2. under flow [`Er2] Sensor type Go to In prompt, check selection (see p. 20), Sensor mismatch or open RTD. -
Page 40: Mounting
Mounting Figure 9- Panel Cut-out Dimensions Panel Thickness 1.5 mm to 9.7 mm (0.060 to 0.38 in.) 45.0mm (1.772 in.) 12.7mm +0.6mm, -0.0mm (0.500 in.) (+0.024 in., -0.000 in.) 22.2mm (0.874 in.) +0.3mm, -0.0mm (+0.012 in., -0.000 in.) 12.7mm (0.500 in.) Figure 10- Mounting Layout for Knockouts Layout for 34.9mm... -
Page 41: Dimensions
Dimensions Figure 11- Series 935A Dimensions 44.96mm (1.770 in.) 53.1mm (2.09 in.) 29.0mm (1.14 in.) Panel Thickness Panel Cutout 1.5mm to 9.7mm (0.060 to 0.38 in.) Maximum Overall Depth 114.3mm (4.50 in.) 101.6mm (4.00 in.) 22.10mm (0.870 in.) 12.7mm (0.50 in.) Watlow Series 935A User’s Manual 39... -
Page 42: Case Top View And Collar
Installation Procedure Make a panel cutout using the dimensions in Figure 9, p. Figure 12- Mounting, Case Top View and Collar Cross Section. 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 the 0 to 0.483 mm space (0 to 0.019 in.) Bezel... -
Page 43: Terminal Block Removal
Terminal Block Removal Figure 14- Terminal Block Removal Procedure Press in on sides of cover to release the terminal cover hooks. Move your grip rearward slightly, then lift the terminal cover straight up. Watlow Series 935A User’s Manual 41... -
Page 44: Wiring
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 death, or damage to property. Power Wiring Input Wiring POWER... - Page 45 ∫ 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. Output 1 Wiring Output 2 Wiring Internal Circuitry POWER...
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Page 46: Wiring Examples
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 result in injury or death, or damage to property. 120VÅ... - Page 47 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 death, or damage to property. 120VÅ...
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Page 48: Glossary
Glossary Alarm Hysteresis A change in the process variable required to re-energize the A condition, generated by the controller, indicating that the pro- control or alarm output. cess has exceeded or fallen below the set or limit point. Idle Set Point Alarm Hysteresis Desired control value before and after timing period. - Page 49 Ready Acknowledge Signal Time A Series 935A countdown timer start choice that pre-initiates the Time duration the timer output will turn ON or OFF after a com- timer with a down key press, and then starts it with a SET press plete timing period.
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Page 50: Index
Index Auto-tune [`Aut] 10, 32 Hours/Minutes [thM] 16, 28 Alarms Hysteresis Alarm High [`AhI] 10, 24 Alarm [AhYS] 17, 24 Alarm Low [`ALO] 10, 24 Heat [hYSh] Alarm Type [AltY] Cool [hYSc] Clearing Alarms 26, 27 Deviation [dEnc] [dEno] Hysteresis [AhYS] Idle [IdLE]... - Page 51 Idle [IdLE] 17, 28 Minutes/Seconds [tMS] 17, 28 Set Point Ready Band [`rdY] 17, 28 Change Signal off [SGof] 17, 28 Local [`L-r] Signal on [SGon] 17, 28 Lock [SLOC] Signal Time [``St] 17, 28 Range High [``rh] Start Timer [Strt] 17, 28 Range Low...
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Page 52: Specifications
Specifications Specifications (2191) RTD Resolution Platinum 0.00385 Curve Control Mode 1° -200 700°C • Auto-tune PID. (-328 1292°F) • PID, PD, PI, on/off. 0.1° -128.8 537.7°C • Countdown timer; hours:minutes, minutes:seconds. (-199.9 999.9°F) • Timer output modes; Delay-off, Delay-on, Signal-off, Signal-on. Control Output Agency Approvals •... -
Page 53: Input Range Information
Ordering a 935A Ordering Information (2192) 935 -1C Single thermocouple or RTD (DIN) input, dual output, singlie display temperature control with time function and four digit display Remote Inputs = Remote set point input, or front panel lock input in place of output #1 = Separate input for remote timer start, or front panel lock Output 1/Remote Input = Switched dc, logic signal, non-isolated;... -
Page 54: Declaration Of Conformity
Declaration of Conformity Erklärt, dass das folgende Produkt: Deutsch Bezeichnung: Serie 935 Series 935 Modell-Nummern: 935(A oder B) – 1C(C, D oder K)(0 oder 1) – (Beliebige vier Ziffern oder Buchstaben) Klassifikation: Temperaturregler, Installationskategorie II, Verschmutzungsgrad II WATLOW Winona, Inc. Nennspannung: 100 bis 240 V~ (ac) oder 24 bis 28 V ‡... - Page 55 Notes Watlow Series 935A User’s Manual 53...
- Page 56 Notes 54 Watlow Series 935A User’s Manual...
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Page 57: 935A Software Map
935A Software Map Prompt Range Default Hidden if * Your Settings 75°F or 23°C Appears always Primary Set Point Select a value, adjustable between Input Type Range Low and Input Type Range High. Auto-tune Choose YES to Auto- tune the 935A. Type J Range Low Alarm Low Select a value,... - Page 58 Prompt Range Default Hidden if * Your Settings Local/Remote Set Point Choose Local or Remote or if Set Point. PID Menu Choose YES to move to the PID Menu. The front panel is locked out. Configuration Menu Choose YES to move to the Configuration Menu.
- Page 59 Prompt Range Default Hidden if * Your Settings 1.0 second Cycle Time Heat or if Select a value between 0.1 and 60.0 seconds (Solid-State Relay or Switched DC) or 5.0 and 60.0 seconds (Electromechanical Relay). 0°F or 0°C Dead Band or if Select a value in whole or if...
- Page 60 Prompt Range Default Hidden if * Your Settings 5.0 seconds or if Cycle Time Cool Select a value between 0.1 and 60.0 seconds or if (Solid-State Relay or is hidden Switched DC) or 5.0 and 60.0 seconds (Electromechanical Relay). 5.00 minutes/repeat Integral Function Select a value, or if...
- Page 61 Prompt Range Default Hidden if * Your Settings J t/c K t/c Input Type T t/c N t/c E t/c S t/c 1.0°RTD 0.1°RTD Celsius/Fahrenheit Choose to indicate temperature in °Fahrenheit or °Celsius. Type J range low value Range Low Select a value between Input Type Range Low and Input Range High.
- Page 62 Prompt Range Default Hidden if * Your Settings none Output 2 Function Choose Heat, Cool, Alarm, Timer (Hrs:Min), Timer (Min:Sec) or No output action. Display Default Choose the primary (last 2 characters) and secondary (first 2 characters) Default displays. Press ß to toggle to the secondary display for 15 seconds.
- Page 63 Prompt Range Default Hidden if * Your Settings Alarm Latch Choose YES for a or if Latching Alarm. and/or Alarm Silencing Choose YES for a or if Silenced Alarm on start- and/or up or silencing during operation. Bumpless Input Failure Mode or if Choose Bumpless Transfer or Percent...
- Page 64 Prompt Range Default Hidden if * Your Settings 00:01 Signal Time or if , then select a value between 00:01 and 99:59 min:sec. Set Point Lockout Choose YES to Lock the Primary Set Point. Always appears Lockout Tag Choose the menus/functions that will not be displayed, and therefore cannot be...
- Page 65 Notes Watlow Series 935A User’s Manual 63...
- Page 66 Notes 64 Watlow Series 935A User’s Manual...
- Page 67 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 designing solid-state electronic control devices since 1962, and has earned the reputation as an excellent supplier to original equipment manufacturers.
- Page 68 Col. Parques Industriales, Telephone: +65 773 9488 Querétaro, Qro. México CP-76130 Fax: +65 778 0323 Telephone: +52 (442) 217-6235 Fax: +52 (442) 217-6403 Watlow Electric Taiwan 10F-1 No. 189 Asia/Pacific: Chi-Shen 2nd Road, Kaohsiung, Taiwan Watlow Australia Pty., Ltd. Telephone: +886 (7) 288-5168...
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Questions and answers
Morning! I have a spray foam right equipped with watlow 935a 1cc0 000r temperature controller and shows the last temperature setting but I can't up and down the temperature, it is stock. I'll appreciate your help. Thank you!
To troubleshoot a Watlow Electric 935A Series temperature controller that is stuck and not allowing temperature adjustments, follow these steps:
1. Check Power – Ensure the system is powered on and properly wired. The controller should begin operating as soon as power is applied.
2. Verify Display Mode – The controller may be in a mode displaying actual process temperature instead of the set point. To change the display mode, go to page 16 of the manual and check the [dISP] setting.
3. Adjust Set Point –
- Press and hold the ß button.
- Use the arrow keys to increase or decrease the set point.
- Release ß to confirm the change.
4. Check for Errors – If an error is displayed, refer to page 8 of the manual for troubleshooting steps.
5. Auto-Tune – If needed, initiate the auto-tune function as described on page 32.
6. Inspect Wiring – Ensure all wiring conforms to local and national electrical codes, and verify there are no ground loops or incorrect connections.
If the issue persists, reviewing the manual for additional troubleshooting or consulting a professional may be necessary.
This answer is automatically generated