Watlow 935A User Manual

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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

Phone: +1 (507) 454-5300, Fax: +1 (507) 452-4507, http://www.watlow.com

U.S. English

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 important for protecting your

equipment and performance. A “WARNING” safety alert appears with information that is important for protecting you,

others and equipment from damage. Pay very close attention to all warnings that apply to your application.

The ç symbol (an exclamation point in a triangle) precedes a general CAUTION or WARNING statement.

The Ó symbol (a lightning bolt in a lightning bolt in a triangle) precedes an electric

shock hazard CAUTION or WARNING safety statement.

Technical Assistance

If you encounter a problem with your Watlow controller, review all configuration information to verify that your selections are consistent with your application: inputs; outputs; alarms; limits; etc. If the problem persists after checking the above, you can get technical assistance by calling your local Watlow representative (see back cover of this manual), or in the U.S., dial +1 (507) 454-5300. For technical support, ask for an Applications Engineer.

Please have the following information available when you call:

• Complete model number • All configuration information

• User’s Manual • Diagnostic menu readings

Warranty and return information is on the inside back cover of this manual.

Your Comments

Your comments or suggestions on this manual are welcome. Please send them to the Technical Literature Team, Watlow Winona, 1241 Bundy Boulevard, P.O. Box 5580, Winona, Minnesota, 55987-5580 U.S.; Telephone: +1 (507) 454-5300; fax: +1 (507) 452-4507.

Safety Alert CAUTION or WARNING

∫

Electrical Shock Hazard

CAUTION or WARNING

Watlow Series 935A User’s Manual 1

Where to find it…

Item ............................................................. Page

Introduction ........................................................ 2

How Keys Work ................................................. 4

Begin Controlling ................................................ 6

Set Point Change ............................................... 7

Simple Error / Response .................................... 8

Software Map; Learn ......................................... 9

Operations Menu; Learn .................................. 10

PID Menu; Learn ...............................................12

Configuration Menu; Learn .............................. 16

Lockout Functions ............................................ 18

Setting Up Inputs and Outputs ........................ 20

Remote Set Point ..............................................22

Front Panel Lockout ......................................... 23

Alarms; Learn ................................................... 24

Alarms; Setting and Clearing ........................... 26

Timer; Learn ..................................................... 28

Timer; Setting ................................................... 30

Timer Example ................................................. 31

Auto-tuning ....................................................... 32

PID Fine tuning ................................................ 33

Calibrating ........................................................ 34

Errors and Troubleshooting ............................. 36

Mounting ...........................................................38

Dimensions .......................................................39

Installing ............................................................40

Terminal Block Removal ...................................41

Wiring ............................................................... 42

Wiring Examples .............................................. 44

Glossary ........................................................... 46

Index ................................................................ 48

Specifications ................................................... 50

Ordering Information ........................................ 51

Declaration of Conformity ................................ 52

Software Map ................................................... 55

How to Reach Us ............................... back cover

Table Numbers ............................................Page

1 Output Functions ....................................... 3

2 Error Messages and Action ...................... 8

3 Software Organization ............................. 9

4 Operations Menu Overview .................... 11

5 PID Menu Overview ............................... 14

6 Configuration Overview .......................... 16

7 Lockout Options ..................................... 19

8 Setting Inputs and Outputs .................... 21

9 Using Front Panel Lock .......................... 23

10 Alarm Functions ..................................... 25

11 More Alarm Functions ............................ 27

12 Timer Functions/Settings ........................ 29

13 Error Codes and Actions ........................ 37

14 Troubleshoot Outputs ............................... 37

15 Input Range Information ......................... 51

Figure Numbers ..........................................Page

1 Input and Output Overview ...................... 3

2 Front Panel Functions .............................. 5

3 Begin Controlling ...................................... 6

4 Changing the Set Point ............................ 7

5 Remote Set Point Wiring ........................ 22

6 Front Panel Lock Wiring ......................... 23

7 Auto-tuning ............................................. 32

8 Calibrating .............................................. 34

9 Panel Cut-out Dimensions ..................... 38

10 Knockout Template ................................. 38

11 Dimensions ............................................ 39

12 Case Top View and Collar ...................... 40

13 NEMA 4X/IP65 Seal ............................... 40

14 Terminal Block Removal ........................ 41

15 Wiring ..................................................... 42

16 System Wiring Example ......................... 44

17 Ladder Diagram Example ...................... 45

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 from a thermocouple or RTD, and dual control outputs. Outputs may operate in combinations of heat or cool, and alarm or timer.

Special Features

• Easy to use operator interface and user’s manual

• Compact panel footprint; 1/32 DIN size

• Water and corrosion proof; IP65/NEMA 4X rated

• Reliable; built to UL, CUL approved safety standards with a three year warranty

• Accuracy with economy

• Universal power supply for worldwide application

Unique Features

The Series 935A Output 1 can be configured as a remote set point input for a multi-loop control system, or, as an alternative, that output can be a front panel lock with your switch to further reinforce the 935A’s lockout capability. The Series 935A timer functions include heat/timer or cool/timer countdown modes in hours:minutes or minutes:seconds.

Introduction

Watlow Series 935A User’s Manual 3

Output 1

Output 2

RDY

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

15 45

Timer (Hr:Min or Min:Sec)

NONE

None

Output 2

Electromechanical Relay, Switched dc or Solid-state Relay

Table 1 - Valid Output Functions

First select Output 1: Then select Output 2: Heat None, Cool, Alarm, Timer Cool None, Heat, Alarm, Timer Alarm None, Heat, Cool Remote Set Point Heat, Cool Front Panel Lock Heat, Cool, Alarm None Heat, Cool, Alarm

• The function of Output 1 determines the options available for Output 2.

• First select the function of Output 1. Refer to the table (right), then select the function of Output 2.

Figure 1 - Series 935A Input and Output Overview

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 value.

3. While continuing to press ß, press . or , to choose new data or select a new value.

4. Release ß and the arrow key to complete the change.

NOTE: The normally displayed actual temperature and set point can be altered to show different combinations of actual

temperature, set point temperature, or time in hours:minutes or minutes:seconds. See [dISP] p. 16.

RDY

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 alarm.

LED 1:

Lit when Output 1 is active.

LED 2:

Lit when Output 2 is active.

RDY:

Lit when the process temperature is inside the timer ready band.

Up / . (Increment) Down / , (Decrement) Arrow Key:

• Selects new information when Set Key is pressed.

• Steps through software menus and parameters.

• Starts and stops the timer.

• To set up the control, go to the Easy Software Map, p. 9.

Figure 2 - Series 935A Front Panel Functions

Watlow Series 935A User’s Manual 5

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 change set point, go to p. 7.

• The Series 935A will auto-tune when you tell it to, go to p. 32.

• If you see an error, go to p. 8.

System

Power

RDY

SET

Figure 3 - Begin Controlling

Watlow Series 935A User’s Manual 7

Change Set Point

RDY

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 alter the set point either upward or downward.

3. Release ß to complete the change.

Figure 4 - Changing the Set Point

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 necessary.

Sensor type Go to {`In} prompt, mismatch. check selection

(see p. 20).

Open Thermocouple, Check the sensor, bad connection, or replace as broken wire. necessary.

Electrical noise. Cycle power to system. See if error

clears. Check system for electrical interference.

Control is inoperable. Check for line voltage at

terminals 7 and 8.

RDY

SET

• Simply correct the cause.

• Errors are non-latching

and self-clearing.

• For advanced error and troubleshooting information, go to p. 37.

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

[`Er1]

[`Er2]

[`Er3]

[`Er4]

[`Er5]

[````]

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 , key to select [`yes]. Release the keys to move to the new menu.

Navigation Example

Learn the Software Map

• To access the Operations Menu, press the

. and , keys simultaneously for three seconds.

• Move through each menu with the . or , key.

• Make changes by pressing and holding the ß key, and

then the . or , key to select a new choice or value. Release the keys to complete the change.

• To exit any menu: Press and hold the

. and , keys for three seconds,

or the display will revert to normal display after 60± 5 seconds.

[Prnc] [Prno [dEnc [dEno

[`Ot2]

[disp]

[Alty]

,,,,

Display

Actual Temperature, Set Point, or Time Remaining

Operations, p. 10

Start / Stop:

•Autotune

Set:

•Alarm Ranges

•Countdown Timer

•Idle after Timer

Select Set Point Type: Go to:

PID Menu Configuration Menu

[`yes] [`yes]

PID, p. 12

Set:

•Heat PID Functions

•Dead Band

•Cool PID Functions

•Calibration Offset

Configuration, p. 16

Set:

•Inputs / Functions

•Output Types

•Display Default

•Alarms / Functions

•Timer Functions

•Failure Mode

•Lockout Functions

10 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 or stop the auto-tuning process. Auto-tuning selects a set of viable proportional, integral, and derivative

values for heat and/or cool output.

• Alarm Points, [`ALO] and [`AhI]: Select the values for the high alarm point and the low alarm point. Alarm points, dependent

on sensor type high and low ranges, reside in the Operations Menu for easy access.

• Timer Countdown Time [tMr]: Select a countdown time value between 00:00 and 99:59 hours:minutes or minutes:seconds.

Time interval choices [thM] and [tMS] reside in the Configuration Menu for Output 2.

• Idle Set Point [IDLE]: [trAc] or an adjustable value between [``rL] and [``rh]. Choose to have the Idle Set Point track

[trAc], or equal, the Primary Set Point; or select an Idle Set Point value in °F or °C between the range low [``rL] and range

high [``rh] values. The Idle Set Point is active both before and after the timing sequence. The normal or Primary Set Point controls during the timing sequence.

• Local/Remote Set Point [`L-r], [```L] or [```r]: Choose to maintain control with the Primary [```L] (local) Set Point, or to

enable the Remote [```r] Set Point if the Output 1 [`Ot1] choice equals Remote Set Point [`rSP].

• Go to the PID Menu [`Pid]: Choose [`YES] to proceed to the PID Menu.

• Go to the Configuration Menu [CnFg]: Choose [`YES] to proceed to the Configuration Menu.

The table on the next page presents this information in graphic form.

NOTE: Not every prompt listed here or on p. 11 in the Operations Menu will appear in your unit. Prompts vary with lockout function and output set-up. Whether or not prompts appear in the Operations Menu depends on two features of the Series 935A:

• Lockout function; the Lockout Tag [`tAg] function masks prompts from view in the various menus. (If you cannot see a prompt, you can make no change.) See Using Lockout Functions, p. 18, for more information.

• Output 1 and 2 Configuration; some outputs are mutually exclusive. For example, if Output 1 is Alarm, then Output 2 cannot be Timer. Therefore, the Operations menu will have no timer-related prompts. See the Valid Output Functions Table, p. 3, or Setting Up Inputs and Outputs, p. 20.

Learn the Operations Menu

Watlow Series 935A User’s Manual 11

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]

NO YES

Alarm Low - Select a low alarm point, adjustable between Off, Range Low and Alarm High.

[`AhI]

Alarm High

Alarm High - Select a high alarm point, adjustable between Alarm Low and Range High, or OFF.

[`ALO]

Alarm Low

Countdown Timer - Select a countdown time duration.

[0)º0] [9959]

00:00 to 99:59 Hrs:Min or Min:Sec

Idle Set Point Type - Choose to track set point, or select a separate idle set point adjustable between Range Low and Range High. When [`Ot1] = [thM] or [tMS], view the idle set point from the set point display with a three second ßpress.

[trAc] [``rL] [``rh]

Track Range Range Set Low High Point

Local / Remote Set Point - Choose to use the remote set point input.

[```L] [```r]

Local Remote

PID Menu - Go to the PID Menu.

[``no] `YES]

NO YES

Configuration Menu - Go to the Configuration Menu.

[``no] `YES]

NO YES

[`Aut]

[`ALO]

[`AhI]

[tMr]

[IDLE]

[`L-r]

[`Pid]

[CnFg]

12 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 offset [`CAL] values manually.

The Series 935A PID Menu is the first sub-menu you encounter after moving to the Operations Menu. The PID Menu provides a software location to select the individual heat or cool proportional band, hysteresis, and cycle time values; and the dead band, integral, derivative, and calibration offset values.

To go to the PID Menu:

1. Go first to the Operations Menu by pressing . and , simultaneously for three seconds.

2. Scroll through the Operations Menu with , until you see the [`Pid] prompt.

3. While pressing ß to display [``no], choose [`YES] with . or ,.

4. Release ß to see the first PID prompt.

NOTE: Access to the PID Menu and the prompts there varies with lockout function and output set-up. The PID Menu is locked out when the 935A leaves the factory.

• Lockout function; the Lockout Tag [`tAg] function masks menus from view (if you cannot see a prompt, you can make no change). See Using Lockout Functions, p. 18.

• Output set-up; you must choose [hEAt] or [COOL] in either Output 1 or Output 2 to have access to the PID Menu. With a [hEAt] only choice, [COOL] prompts are not visible, and vice versa. See the Valid Output Functions Table, p. 3, or Setting Up Inputs and Outputs, p. 20.

NOTE: Proportional Band, Integral, Derivative, Dead Band, and Calibration Offset values are adjustable in whole or tenth °F or °C, depending on input type [``In] and [`C_F] Celsius/Fahrenheit Configuration Menu choices.

Learn the PID Menu

Watlow Series 935A User’s Manual 13

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`h] or [Pb`c] = 0.

Range: 0 to 999°F/555°C, or 0.0 to 999.0°F/555.0°C Default: 25°F/17°C, or 25.0°F/17.0°C

• Hysteresis, Heat and Cool [hYSh] and [hYSc]: For use with on/off control only. Select the value (degrees) for the process vari-

able change required to re-energize the control heat and/or cool output. For ON/off control, set [Pb`h] or [Pb`c] = 0.

Range: 1 to 999°F/555°C, or 0.1 to 999.0°F/555.0°C Default: 3°F/2°C, or 3.0°F/2.0°C

• Cycle Time, [Ct`h] and [Ct`c]: Select the value (seconds) required for the heat and/or cool output(s) to complete a full ON

through off cycle.

Range: Switched dc/Solid State Relay: 0.1 to 60.0 seconds Default: 5.0 seconds Range: Electromechanical Relay: 5.0 to 60.0 seconds Default: 30.0 seconds

• Dead Band [``db]: Dead Band adjusts the effective cool set point above the primary set point by the Dead Band value in de-

grees. This creates a band between the heating and cooling proportional bands where only integral and derivative activity will occur. For more information on Dead Band fine tuning, go to p. 33.

Range: 0 to 999°F/555°C, or 0.0 to 999.0°F/555.0°C Default: 0°

• Integral [``It]: Select a value (minutes/repeat) for the integral function. Integral is the inverse of Reset; It(value) =

1/Reset(value).

Range: 0.00 to 99.99 minutes/repeat Default: 5.00 minutes/repeat

• Derivative [``dE]: Select a value (minutes) for the derivative function.

Range: 0.00 to 9.99 minutes Default: 0.00 minutes

• Calibration Offset [`CAL]: Eliminates the difference between the displayed process temperature and the actual process temper-

ature value.

Range: -999 to 9999°F/C, or -99.9 to 999.9F/C Default: 0°

14 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 heat ON/off control switching hysteresis.

[```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

Cycle Time Heat - Select a cycle time for the heat output.

[``)1]

[`6)0] [``%0] [`6)0

0.1 to 60.0 seconds 5.0 to 60.0 seconds (SSR or Switched dc) (Electromechanical Relay)

Dead Band - Select a dead 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

Set-Up Cool

Proportional Band Cool - Select a cool 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 Cool - Select a cool ON/off control switching hysteresis.

[```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°, or 0.1°C to 555.0°C

Cycle Time Cool - Select a cool output cycle time.

[``)1] [`6)0] [``%0] [`6)0

0.1 to 60.0 seconds 5.0 to 60.0 seconds (SSR or Switched dc) (Electromechanical Relay)

[Pb`h]

[hySh]

[Ct`h]

[``db]

[Pb`c]

[hySc]

[Ct`c]

Learn the PID Menu - Details

Watlow Series 935A User’s Manual 15

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] [99(9

-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. The PID Menu is locked out when the 935A leaves the factory.

• Lockout function; the Lockout Tag [`tAg] function masks menus from view (if you cannot see a prompt, you can make no

change). See Using Lockout Functions, p. 18.

• Output set-up; you must choose [hEAt] or [COOL] in either Output 1 or Output 2 to have access to the PID Menu. With a

[hEAt] only choice, [COOL] prompts are not visible, and vice versa. See the Valid Output Functions Table, p. 3, or Setting Up

Inputs and Outputs, p. 20.

[``It]

[``dE]

[`CAL]

16 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 three seconds.

2. Scroll through the Operations Menu with , until you see the [CnFg] prompt.

3. While holding ß to display [``no], choose [`YES] with . or ,.

4. Release ß to see the first [CnFg] prompt, [``In].

5. To leave the Configuration Menu, press . and , for 3 seconds.

Table 6 - Configuration Menu Overview

Input Type - Choose sensor type. See p. 21 for sensor ranges.

[```J] [```H] [```t] [```n] [```E] [```S] [`rtd] [`r†d]

J t/c K t/c T t/c N t/c E t/c S t/c 1.0° RTD 0.1° RTD

Celsius/Fahrenheit - Choose displayed unit of measure.

[``°F] [``°C]

°F °C

Input Range Low - Select lowest displayable set point. Ranges, p. 21.

[``In] [``rh]

Select a value (lowest displayable set point) between Input Type Range Low and Input Range High.

Input Range High - Select highest displayable set point. Ranges, p. 21.

[``Rl [``In]]

Select a value (highest displayable set point) between Input Type Range High and Input Range Low.

Output 1 Function - Choose Output 1 type; see Valid Outputs Table, p. 21.

[hEAt] [COOL] [ALM] [`rSP] [`FPL]] [nonE]]

Heat Cool Alarm Remote Front None

Set Point Panel Lock

Output 2 Function - Choose Output 2 type (dependent on Output 1 choice).

hEAt] [COOL] [ALM] [thM] [tMS] [nonE]]

Heat Cool Alarm Timer Timer None

Hr./Min. Min./Sec

Display Default -

Choose the primary (last 2 characters) and secondary (first 2 characters) default displays. Press ßto toggle to the secondary display

for 15 seconds.

[``Ac] [AcSP] [Acti] [tiAc] [tiSP]

No Actual Actual Time Time remaining secondary temp. temp. remaining Set point temperature Actual Set point Time Actual temp. temp. remaining temp.

Alarm Type - Choose alarm type with output action.

[Prnc] [Prno] [dEnc] [dEno]

Process Process Deviation Deviation normally normally normally normally closed open closed open

[``In]

[`C_F]

[``rL]

[``rh]

[`Ot1]

[`Ot2]

[dISP]

[ALty]

Learn the Configuration Menu

Watlow Series 935A User’s Manual 17

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 - Choose latching or non-latching alarms. A latching alarm requires a ß press to clear it after the alarm condition clears.

[``no] [`YES]

NO YES

Alarm Silencing - Choose to silence alarms on startup, or not.

[`SIL] = [`YES] silence an alarm with a ß press.

[``no] [`YES

NO YES

Failure Mode - Choose output action after a sensor failure. Bumpless transfer provides a smooth transition to percent power control without output state change.

[bPLS] [-100] [`100]

Bumpless Percent Power

Timer Output Function - Choose output function for the end of the timer. Delay ON = Turn ON, Delay Off = Turn off, Signal ON = Toggle ON, Signal off = Toggle off

[dLon] [dLoF] [SGon] [SGof]

Delay Delay Signal Signal on Off On Off

Start Timer Function - Choose the start timer conditions:

[IMd] = Immediate start on a , press; [`rdy] = , press and Actual temp. is inside the Ready Band; [rdYA] = , press, plus Actual temp. is inside the Ready Band, then acknowledge with a ß press; [PWr] = immediate start on power-up without waiting for the Ready Band temp. or a , press.

[IMd] [`rdY] [rdYA] [PWr]

Immediate Ready Ready Power

Acknowledge

Timer Ready Band - If [Strt] =[`rdY] or [rdYA], select ready band high/low values.

[```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

Signal Time - If [tIM] = [SGon] or [SGoF], select a Signal ON or Signal off time duration to trigger an annunciator or other action at completion of countdown time.

[```1] [9959]

1 sec. to 99:59 min:sec.

Set Point Lock - Choose to lock the Primary Set Point from change, not view.

[``no] [`YES]

NO YES

Lockout Tag - Choose undisplayable/unchangeable menus; [PCOA] = all locked.

[PCOA] [PCO`] [PC`A] [PC``] [P`OA] [P`O`] [P``A] [P```]

[`COa] [`CO`] [`C`A] [`C``] [``OA] [``O`] [```A] [````]

Choose the menus / function that will not be displayed, and therefore cannot be changed. P = PID Menu, C = Configuration Menu (except [`tAG]), O = Operations Menu (except [CnFG]), A = Auto-tune.

[AhyS]

[`LAt]

[`SIL]

[FAIL]

[tIM]

[Strt]

[`rdy]

[``St]

[SLOC]

[`tAg]

18 Watlow Series 935A User’s Manual

The Series 935A offers three different security, or “lockout,” options. Set up one or all three lockout options 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. 23. Choose Front Panel Lock [`FPL] as an exclusive Output 1 choice. Output 2 offers heat, cool, or alarm.

• Choose Set Point Lock [SLOC] as the simplest lockout option. It locks the Primary Set Point

from change, but not from view.

• Choose the Security Tag [`tAG] as a means of masking the Series 935A software menus from

view. By selecting all or part of the four-digit binary acronym, [PCOA] (Proportional / Configuration / Operation / Auto-tune), you can choose to mask those items from view, and therefore from change. For example: In the Configuration Menu [`tAG] set-up, if you can see the P, the operator cannot see the PID menu.

• Exceptions to [PCOA] [`tAG] are: “C” does not lock out [`tAG]. “O” does not lock out [CnFG].

∫

WARNING: When Output 1 is a Front Panel Lock [`OT1] = [`FPL] , the output is energized! Do not connect a power switching device to Output 1; injury or death or damage to equipment or property could result.

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]

Alarm Silencing

[FAIL]

Failure Mode

[tIM]

Timer Function

[Strt]

Start Timer

[`rdY]

Timer Ready Band

[``St]

Signal Time

[SLOC]

✓

Set Point Lockout

[`tAG]

✓

Lockout Tag

Using Lockout Functions

Watlow Series 935A User’s Manual 19

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

View, Change Operation Menu No

Yes Yes Yes Yes

No Yes

View, Change Configuration Menu

(except tag) No Yes Yes Yes No Yes Yes View, Change PID No Yes Yes No Yes Yes Yes

= No Lockout

= Fully Locked

= Operator's Perspective

Set Point LockoutFront Panel Lockout Security Tag

Three Lockout Options

Note: Front Panel Lockout requires an external hardware switch. For [`FPL] set-up and wiring information, see p.

23. For more wiring information, see p. 43.

P = PID Menu C = Configuration Menu (except [`tag]) O = Operations Menu (except [CnFG]) A = Auto-tune

Table 7 - Series 935A Lockout Options

[`Ot1] [SLOC] [`tAG]

[`fpl]

[`YES] [P```] [`C``] [``O`]

[[```A]

[``no]

[`fpl]

SET

1 2 RDY

[slOC]

[````] [PCOA]

20 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 [`rSP] option.

• Remote Set Point [`rSP] is a second input, wired to OT1 Terminals 3 and 4.

• Indication of °C or °F units of measure occurs only in the [`C_F] prompt.

• Sensor input type minimum and maximum range (see p. 51) is further defined with Range Low

[``rL] and Range High [``rh] to set the working span of set points and remote set point scal-

ing.

• Output 1 and Output 2 configure the prime functions of the Series 935A, they are the “golden” prompts.

• Output 1 must be heat or cool to use Output 2 as a timer.

• Remote Set Point [`rSP] enables Output 1 to act as an input for 0-5Î (dc) from another con-

troller or a transmitter.

• Front Panel Lock [`FPL] requires an external switch and 62Ω 0.5 watt resistor wired in parallel on Output 1. Switch open = unlocked; closed = locked. See p. 23.

• Output 2 sets timer interval in hours:minutes [thM] or minutes:seconds [tMS].

• Display Default [dISP] lets you choose the primary (last 2 characters) and secondary (first 2 characters) default displays. Press ß to toggle to the secondary display for 15 seconds.

[``Ac] = Normal Display: Actual Temperature

Secondary: None

[AcSP] = Normal Display: Set Point Temperature

Secondary: Actual Temperature

[Acti] = Normal Display: Time Remaining

Secondary: Actual Temperature

[TiAc] = Normal Display: Actual Temperature

Secondary: Time Remaining

[tiSP] = Normal Display: Set Point Temperature

Secondary: Time Remaining

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]

Alarm Silencing

[FAIL]

Failure Mode

[tIM]

Timer Function

[Strt]

Start Timer

[`rdY]

Timer Ready Band

[``St]

Signal Time

[SLOC]

Set Point Lockout

[`tAG]

Lockout Tag

Watlow Series 935A User’s Manual 21

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 to 1292°F or -200 to 700°C

0.1° RTD: -99.9 to 999.9°F or -99.9 to 700.0°C

Table 8 - Setting Inputs and Outputs

Input Type - Choose sensor type.

[```J] [```H] [```t] [```n] [```E] [```S] [`rtd] [`r†d]

J t/c K t/c T t/c N t/c E t/c S t/c 1.0° RTD 0.1° RTD

Celsius/Fahrenheit - Choose displayed unit of measure.

[``°F] [``°C]

°F °C

Input Range Low - Select lowest displayable Set Point, dependent on [``In].

[``In] [``rh] Select a value (lowest displayable set point) between

Input Type Range Low and Input Range High.

Input Range High - Select highest displayable Set Point, dependent on [``In].

[``rL] [``In] Select a value (highest displayable set point) between

Input Type Range High and Input Range Low.

Output 1 Function - Choose Output 1 type.

[hEAt] [COOL] [ALM] [`rsP] [`FPL] [nonE]

Heat Cool Alarm Remote Front None

Set Panel Point Lock

Output 2 Function - Choose Output 2 type (dependent on Output 1 choice).

[hEAt] [COOL] [ALM] [thM] [tMS] [nonE]

Heat Cool Alarm Timer Timer None

Hr./Min. Min./Sec

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.

[``Ac] [[AcSP]] [Acti] [tiAc] [tiSP]

No secondary Actual temperature Actual temperature Time remaining Time remaining Actual temperature Set point Time remaining Actual temperature Set point temperature

temperature

Valid Output Functions

Note: Access to Configuration Menu varies with lockout function. See p. 19.

• The function of Output 1 determines the options available for Output 2.

• First select the function of Output 1. Refer to the table (right), then select the function of Output 2.

[``In]

[`C_F]

[``rL]

[``rh]

[`Ot1]

[`Ot2]

[dISP]

22 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 0-5VÎ (dc) input with [``rL] and [``rh].

5. Go to [`Ot1], and choose [`rSP].

6. Go to the Operations Menu; [`L-r], choose [```r].

Output 1

[`Ot1] [`rSP] Select Remote Set Point for Output 1

Local / Remote

[`L-r] [```L] Local set point active

[```r] Remote set point active

• Remote Set Point is scaled by [``rh] and [``rL].

• 0V input results in a set point of [``rL].

• 5V input results in a set point of [``rh].

• Adjust [``rL] and [``rh] to match your input to desired set point adjustment.

• The Remote Set Point will display instead of Primary Set Point.

• Auto-tune always uses the Primary Set Point.

• Deviation Alarm uses the active Set Point.

Figure 5 - Remote Set Point Wiring

See p. 42-45 for more wiring information.

NOTE: Sensor required on Terminals 1 and 2.

∫

WARNING: All 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.

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

•

[FAIL]

Failure Mode

[SLOC]

Set Point Lockout

[`TAG]

Lockout Tag

Operations Menu

[`Aut]

Auto-tune

[`L-r]

✓

Local / Remote

[`Pid]

PID

[CnFG]

Configuration

Set Up Remote Set Point Input

OT1IN OT2

–

2–3+45678

POWER

Watlow Series 935A User’s Manual 23

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 for more wiring information. (Closed switch = locked)

∫

WARNING: When Output 1 is a Front Panel Lock [`Ot1] = [`FPL], the output is energized! Do not connect a power switching device to Output 1; injury or death, or damage to equipment or property could result.

CAUTION: Failure to install a 60 to 70Ω, 0.5 watt resistor across the customer-supplied Front Panel Lock switch will cause the panel to lock out even when the switch is open. Injury to personnel, or damage to equipment or property could result.

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

•

[FAIL]

Failure Mode

[tIM

Timer Function

[Strt]

Start Timer

[`rdY]

Timer Ready Band

[``St]

Signal Time

[SLOC]

Set Point Lockout

[`tAG]

Lockout Tag

[`Ot1] [`FPL]

Set Up Front Panel Lockout

[`Ot1] = [`FPL]

View Process Yes View Set Point Yes Change Set Point No Auto-tune No Reset Alarm Yes View or Change Operation No

Menu (Except Config. Menu) View or Change Configuration No

Menu (Except Tag) View or Change PID Menu No

[`fpl]

SET

2 RDY

OT1IN OT2

–

2–3+45678

60 to 70Ω 0.5w resistor See Caution

Output 1; Front Panel Lock

POWER

24 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]

✓

Alarm Silencing

[FAIL]

Failure Mode

Operations Menu

[`Aut]

Auto-tune

[`ALO]

✓

Alarm Range Low

[`AhI]

✓

Alarm Range High

[`Pid]

PID

[CnFG]

Configuration

Learning Alarms

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 [``hI] or [``LO] flashing on the main display.

• Process alarms use absolute high and low values to trigger an alarm. Use this alarm type if your

process may be subject to temperatures that it must not exceed. Use [`AhI] and [`ALO] to set alarm points at or near these values. See Table 10: [ALtY], next page.

• Deviation alarms are triggered by a deviation from the set point. The alarm high value [`AhI] is

the deviation above set point, and the low value [`ALO] is the deviation below set point. Whenever the set point is adjusted, the alarm settings are relative to that value. Deviation alarms use the currently controlling set point, whether primary, remote, idle, or 90% of primary, during auto-tuning. See Table 10: [ALtY], next page.

• Normally Open, [dEno] or [Prno], Alarms energize the alarm output when an alarm condition

occurs, and de-energize it when cleared. Use this type to activate external devices such as audible alarms or lights. See Table 10: [ALtY], next page.

• Normally Closed, [dEnc] or [Prnc], Alarms de-energize the alarm output when an alarm condi-

tion occurs, and energize it when the alarm is cleared. Use this type as a “deadman” switch where system continuity is required for operation. See Table 10: [ALtY], next page.

For example, by running the control output through the alarm output, you can set a normally closed process alarm to disable the process when the process exceeds the alarm set point. The alarm output will be off when power is off.

• Alarm Hysteresis sets a point the process must pass on a return (from an alarm condition excur-

sion) to the [`ALO] and [`AhI] points before the alarm can clear. This prevents the alarm output from “chattering” if the process is hovering around the alarm set point. See Table 10: [AhYS], next page.

• Latching Alarms require the operator to clear them with a ß press after the process returns to a

safe, or non-alarm condition. Non-latching alarms self-clear. See Table 11: [`LAt], p. 27.

• Silenced Alarms provide a means to clear the alarm output with a ß press even if the alarm

condition still exists. The flashing [``hI] or [``LO] message will persist until the alarm condition ceases. See Table 11: [`SIL], p. 27. If [`SIL] = [`YES], alarms are disabled (no message or output) on startup until the safe area is reached.

• Alarm High and Low Points, [`AhI] and [`ALO], in the Operations menu determine where

alarms will trigger. Alarm hysteresis [AhYS] determines where an alarm condition clears. See Table 11, page 27.

• To Clear an Alarm that is latched or “silence-able’ requires the operator to press the ß key after the process returns to a safe, or non-alarm condition. Non-latching alarms self-clear. See Table 11:

[`LAt] and [`SIL], p. 27.

Table 10 (p. 25) and Table 11 (p. 27) illustrate the Series 935A alarm features.

Watlow Series 935A User’s Manual 25

Table 10 - Alarm Functions

Deviation Alarm Process Alarm

[ALtY]

Alarm Type

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 Alarm Output Status:

Function

A deviation alarm tracks set point.

A process alarm is a fixed value, independent of set point.

[AhYS]

[dEnc] [dEno] [Prnc] [Prno]

Deviation normally closed

Deviation normally open

Alarm High Region

[AhYS]

Set Point

Safe Area

[AhYS]

Alarm Low Region

Alarm Hysteresis is the change in the process variable (actual) required to clear the alarm relay after an alarm occurs.

Process normally closed

Process normally open

Alarm High Region

[AhYS]

Safe Area

[AhYS]

Alarm Low Region

26 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 [CnFG]. See p. 16.

4. Set either Output 1 [`Ot1] or Output 2 [`Ot2] as the [ALM] output.

5. Set Alarm Type [ALty].

6. Set alarm hysteresis [AhYS].

7. Set alarm latching [`LAt].

8. Set alarm silencing [`SIL].

9. Set a failure mode [FAIL]. See p. 36-37.

10. Go to the 935A’s Operation Menu. See p.10.

11. Set the alarm high and low [`ALO] and [`AhI] points.

12. Test and adjust the alarm system.

13. Document the alarm settings and system.

CAUTION: Verify, in Table 10, p. 25, the alarm state / alarm output condition you want before making the Alarm Type [ALty] choice. Failure to do so could result in damage to equipment and property.

WARNING: Do not rely on the Series 935A alarms to provide redundant temperature limit control. Use correctly specified, properly installed temperature limit controls instead. Failure to do so could result in injury, death or damage to equipment and property. (See accompanying Watlow Bulletin 89.4.3.)

To Clear a Series 935AAlarm

In general, press the ß key to clear a latched or ‘silence-able’ ([`sil] = [yes]) alarm. Ultimately, the system process value must return within the safe area for the alarm to remain clear. Non-

latching alarms self-clear.

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]

✓

Alarm Silencing

[FAIL]

Failure Mode

Operations Menu

[`Aut]

Auto-tune

[`ALO]

✓

Alarm Range Low

[`AhI]

✓

Alarm Range High

[`Pid]

PID

[CnFG]

Configuration

Setting Alarms

Table 11 (below) and Table 10 (p. 25) illustrate the Series 935A alarm features.

Table 11 - Alarm Functions

Watlow Series 935A User’s Manual 27

[`lat]

Latching alarm

[`sIl]

Silence alarm

[`alO]

Alarm Low

[``no]

An unlatched alarm self-clears when actual temperature returns to within the safe area.

[``no]

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 exists).

A value from input Range Low to [`AhI].

At the Range Low value, a , press displays [`off] and [`ahi] disables.

[`yes]

A latched alarm requires the operator to press the ß key to clear after the actual temperature returns to within the safe area.

[`yes]

With this selection, an alarm can be silenced by pressing the

ß key. [yes] provides automatic

alarm silencing on start up.

SET

[`ahI]

Alarm High

A value from [`alo] to input Range High

At the Range High value, a . press displays [`off] and [`ahi] disables.

28 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]

✓

Start Timer

[`rdY]

✓

Timer Ready Band

[``St]

✓

Signal Time

Operations Menu

[`Aut]

Auto-tune

[tMr]

✓

Countdown Timer

[IdLE]

✓

Idle

• The timer requires Output 1 to work as either a heat or as a cool output.

• 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.

• Hours: minutes (hh:mm) or minutes:seconds (mm:ss) choices reside in Output 2 [`Ot2].

• Timer set-up occurs in two locations, in the Configuration Menu and the Operations Menu.

• , starts the timer.

• . stops the timer.

• [dISP] choices set up the timer display (see p. 16).

• LED colon flashes when timer runs.

LED colon ON steadily when timer is not running.

Configuration Menu set-up includes: (see p. 16)

• Output 1 [`Ot1]; heat [hEAt] or cool [COOL].

• Output 2 [`Ot2]; timing interval,

hours:minutes [thM], or minutes:seconds [tMS].

• Timer (Output 2) function [tIM] can perform one of four possible actions after timing:

1. Turn ON, also called, “delay ON” [dLon].

2. Turn off, also called, “delay off” [dLof].

3. Toggle ON, also called, “signal ON” [sgon].

4. Toggle off, also called, “signal off” [sgof].

• Start timer function [Strt] choices:

1. Immediately start [IMd].

2. Start once inside a ready band [`rdy].

3. Start once inside a ready band, acknowledging [rdya] with a ß press.

4. Start immediately on control power up [PWr] without waiting for the Ready Band temp. or a

, press.

• Ready band width [`rdy] above and below set point: degrees.

• Signal time [``St] (if applicable) duration: seconds.

Operations Menu set-up includes: (see p. 10)

• Countdown Time [tMr]: hours:minutes or minutes:seconds.

• Idle Set Point Type [IdLE], two choices:

1. Track primary set point (always controls at the set point value).

2. Set an idle set point for control when not timing.

The next page presents this information in graphic format with additional detail.

15 45

Learn the Countdown Timer

Watlow Series 935A User’s Manual 29

Table 12 - Series 935A Timer Functions/Settings

Configuration Menu

Choose time in hr:min or min:sec.

Timer set-up available only when = or

Output 2 Timer Output Function;

Choose one of four possible output actions for the end of the timer / time periods.

Start Timer Function

Timer Ready Band

Operations Menu

Delay ON

Output 2 is ON before timing; OFF during timing; ON after timing.

Timer starts immediately on a key press at the normal display without waiting for the Ready Band temperature.

Timer only runs in the Ready Band. key starts timer sequence.

Ready Acknowledge. key starts timer sequence. must be pressed once inside the Ready Band to start timer at the normal display.

Timer starts immediately on control power up without waiting for the Ready Band temperature or a , press. See p. 61.

• = 0, Disables Ready feature.

• The RDY front panel LED is lit inside Ready Band for all Timer Start functions.

Signal Time

Timer Function OFF.

Delay OFF Signal ON Signal OFF

Output 2 is OFF before timing; ON during timing; OFF after timing.

RDY RDY

RDY

Output 2 is OFF before & during timing; ON after timing; then OFF.

Sets the signal time from 00:01 to 99:59 min:sec to run after Timer.

Countdown Time

Output 2 is ON before & during timing; OFF after timing; then ON.

SET

Idle Set Point

Idle

• Idle is set point used when not timing.

• If Trac selected Idle is the same as Set Point.

• The Set Point value controls the process during the Timer sequence.

30 Watlow Series 935A User’s Manual

15 45

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 [tMS].

5. Choose a display default [dISP] (see page 16):

• Actual Temperature only [``Ac]

• Actual; Set Point [AcSP]

• Actual; Time [Acti]

• Time; Actual [tiAc]

• Time; Set Point [tiSP]

6. Choose a Timer Output Function [tIM]:

• Delay ON [dLon]

• Delay off [dLoF]

• Signal ON [sgon]

• Signal off [sgoF]

7. Choose a start timer [Strt] function; either immediate [IMd], ready band [`rdY], Ready Acknowledge [rdYA], or Power [PWr].

8. If you chose [`rdY] or [rdya], then select a ready band [`rdy] value.

9. If you chose [SGon] or [sgof], then select a signal time [``St] value.

10. Go to the 935A’s Operation Menu.

11. Set the countdown time [tMr].

12. Choose the idle set point [IdLE] to track [trAc] the primary set point, or select a separate idle set

point value between the range high [``rh] and range low [``rL] values.

13. Run the system, and test the timer start with a ß press.

14. Document the timer settings and system.

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]

✓

Start Timer

[`rdY]

✓

Timer Ready Band

[``St]

✓

Signal Time

Operations Menu

[`Aut]

Auto-tune

[tMr]

✓

Countdown Timer

[IdLE]

✓

Idle

Setting the Countdown Timer

Watlow Series 935A User’s Manual 31

15 45

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. When the baking time is complete, he wants a 10 second audible indication that the bread is done.

Recommended Control

A Series 935A-1CD0-000G control.

• Switched dc Output 1 wired to a dc input solid state relay (SSR) switches the heaters.

• Electromechanical relay Output 2 wired to an AC audible indicator provides “done” indication.

Configuration Menu Set-up

[`C_F] = [``°f] °F [dIsp] = [Acti] After a ß press, actual temperature appears for 15 seconds. [`Ot1] = [hEAt] Heating output [`Ot2] = [tMS] Time; minutes:seconds [tIM] = [SGon] Output 2 turns ON briefly at the end of the timing cycle. [Strt] = [rdYA] Timer waits to countdown until temperature deviation from set point < [`rdy] value and the ß key

is pressed.

[`rdY] = [``10] Ready band; 10°F [``St] = [``10] Output 2 turns ON for 10 sec. at the end of the timing cycle.

Operations Menu Set-up

[tMr] = [3000] Bake time; 30 minutes [IdLE] = [``75] The set point temperature before a timing cycle starts and after a timing cycle completes.

Set Point = [`350°F

Operator/Control Actions

• With the oven "idling" at 75°F, the chef starts the preheat cycle with a , press. The display immediately shows 30:00 with the colon ON steadily. The RDY LED is off. Series 935A begins to control to the 350°F bake set point.

• As the actual oven temperature increases to within the Ready Band at 350°F ±10°F, the RDY LED turns on. The chef loads the oven and presses ß to acknowledge the Ready Band and thereby start the bake cycle.

• Time starts counting down. Actual temperature displays for 15 seconds after the ß key is press. Then time displays with the colon flashing.

• If temperature deviates out of the Ready Band (less than 340°F or more than 360°F), timer countdown will pause, but will continue as soon as temperature re-enters the ready band.

• When time reaches 00:00, Output 2 turns on for 10 seconds sounding the audible indicator. The chef can stop the audible indicator by pressing .. The Series 935A then automatically shifts to the 75°F idle set point.

Timer Example

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] stops auto-tuning.

Figure 7 - Auto-tuning the Series 935A

Manual Tuning

For optimum performance, tune the Series 935A to your thermal system. The settings here are for a broad spectrum of applications; your system may have different requirements.

Tune heating outputs at a set point above ambient temperature. Tune cooling outputs at a set point below ambient temp.

1. Apply power to the 935A and enter a set point.

In the Operations Menu, [`Aut] must = [``no]. Begin with these Configuration Menu settings:

[Pb`h = [```1], [``1t] = [`000], [``dE] = [`000], [Ct`h] = [`%0]], [`CAL] = [```0].

2. Proportional Band Adjustment: Gradually increase [Pb`h] until the upper display temp. stabilizes

at a constant value.

3. Integral Adjustment: Gradually decrease [``It] from 30.00 until the display temperature begins to

oscillate or “hunt.” Then slowly increase [``It] until the upper display stabilizes again near set point.

4. Cycle Time Adjustment: Set [Ct`h] as required. Faster cycle times sometimes achieve the best

system control. However, if a mechanical contactor or solenoid is switching power to the load, a longer cycle time will minimize wear on relays.

5. Derivative Adjustment: Increase [``dE] to 0.10 minute. Then raise set point by 20° to 30°F, or 11°

to 17°C. Observe approach to set point. If load temperature overshoots, increase [``dE] by 0.50 minute. Raise set point by 20 to 30°F, or 11 to 17°C and watch approach again. Repeat until sys- tem rises to new set point appropriately.

6. Calibration Offset Adjustment: Enter the [`CAL] offset value you want. Calibration offset adds or

subtracts degrees from the value of the input signal.

Temperature

Time

90%

Set Point

32 Watlow Series 935A User’s Manual

Auto-tuning

NOTE:

[`Aut] is

not visible at factory default.

CAUTION: Successful Series 935A auto-tuning requires 3 oscillations thru the 90% set point in 85 min. or less. If the system cannot perform the oscillations in that time, the control will revert to the previous PID values.

NOTE: Manual tuning is a slow procedure, taking from minutes to hours to obtain optimum value.

Operations Menu

[`Aut]

✓

Auto-tune

[`ALO]

Alarm Range Low

[`Ah1]

Alarm Range High

[tMr]

Countdown Timer

[IdLE]

Idle

[`L-r]

Local / Remote

[`Pid]

PID

[CnFg]

Configuration

Auto-tuning occurs at 90% of set point in less than or equal to 85 minutes.

Watlow Series 935A User’s Manual 33

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 Bands should be decreased for tighter control but increased to eliminate oscillations.

4. Cycle Time Heat [Ct`h] is limited to a minimum of 5.0 seconds for the electromechanical relay to help

reduce wear. The electromechanical relay (D, Output 2) is not recommended for PID control. It is warranted to 100,000 contact closures only. Alarm or on/off control are appropriate applications for the Series 935A's electromechanical relay output.

5. Set Dead Band [``db] to adjust the effective cool set point above the primary set point by the dead

band value in degrees. In cool/heat applications, dead band prevents continuous cool output action by creating a buffer between heating and cooling output action.

6. Set [Pb`c] and [Ct`c] in degrees.

7. If Proportional Band Cool [Pb`c] = 0, Set Hysteresis Heat [HYSc]. The Series 935A will provide on/off

control with the hysteresis value selected, and no proportioning action.

8. Proportional Bands should be decreased for tighter control but increased to eliminate oscillations.

9. Cycle Time Heat [Ct`h] is limited to a minimum of 5.0 seconds for the electromechanical relay to help

10. Set Integral [``It] to eliminate droop in the system. Lower the value for more droop reduction.

Adjustable from 0 to 99.9 minutes / repeat.

11. Set Derivative [``dE] to prevent overshoot. Increasing the value slows the approach to set point.

Adjustable from 0 to 9.99 minutes.

12. Calibration Offset [`Cal] eliminates the difference between the displayed process temperature and the

actual process temperature value.

PID Menu

Set up Heat:

[Pb`h]

✓

Proportional Band

[hySh]

✓

Hysteresis

[Ct`h]

✓

Cycle Time

[``db]

✓

Dead Band

Set up Cool:

[Pb`c]

✓

Proportional Band

[hySc]

✓

Hysteresis

[Ct`c]

✓

Cycle Time

Set up General:

[``It]

✓

Integral

[``dE]

✓

Derivative

[`CAL]

✓

Calibration Offset

34 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.

• [r380] and [r`15] calibrate the RTD span.

• 0V is required when calibrating [tc00] and [r`15] for remote set point calibration.

• 5V is required when calibrating [tc50] and [r380] for remote set point calibration.

• When calibrating, calibrate all points for consistency in results.

• Allow the unit to warm up for 15 minutes before calibrating.

Quick Calibration Restore:

Press all three keys simultaneously until

[tc50] appears in the

display, press . once and [`rSt] will appear in the display. Press and hold ß, the display will show

[``no], press . to

change display to

[`YES]. Press and

hold . and , for 3 seconds to exit the [`CAL] menu.

NOTE: Restore Factory Calibration

[`rSt] = [`YES]

restores factory calibration values to all calibration prompts.

Figure 8a Thermocouple Calibration

Figure 8b RTD Calibration

Calibration Menu

[tc50]

✓

tc50

[tc00]

✓

tc00

[``tc]

✓

[r`15]

✓

r15

[r380]

✓

r380

[`rSt]

✓

rst

OT1IN OT2

–

+2–3+

source

mV source = 50.000mV Volt source = 5V

• Store TC counts at 50.000mV

• Store 5V remote set point

counts for use with TC

mV source = 0.000mV Volt source = 0V

• Store TC counts at 0.000mV

• Store 0V remote set point

counts for use with TC

mV source = Temp. Compensation Volt source = 0V

• Store ambient counts at 32° F. Type J.

45678

Volt

source

POWER

OT1IN OT2

–

+2–3+

Decade

Box

Decade Box = 15.00 ohms Volt source = 0V

• Store low end RTD counts

• Store 0V remote set point

counts for use with RTD

mV source = 380.00 ohms Volt source = 5V

• Store high end RTD counts

• Store 5V remote set point

counts for use with RTD

• Restore factory calibration

45678

Volt

source

POWER

Watlow Series 935A User’s Manual 35

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. Connect 100-240Å (ac), or 24-28V‡ (ac/dc) to Terminal 7 and Terminal 8.

2. Connect the millivolt source to Terminal 1 negative and Terminal 2 positive.

3. Connect voltage source to Terminal 3 negative and Terminal 4 positive.

4. Apply power to the unit and allow it to warm up for 15 minutes. Move to the Calibration Menu:

1. Press . and , simultaneously for 3 seconds.

2. Press . or , until [CnFG] is displayed.

Press and hold ß – press . or , to select [`YES], then release ß.

3. Press . or , until [`TAG] is displayed.

Press and hold ß. Press . or ,8 times (display shall be blank).

Calibration: (Thermocouple)

1. Press and hold ß, ., and , simultaneously for 3 seconds until [TR50] is displayed.

2. Set the mV source to 50.00mVÎ (dc). Set the voltage source to 5.00VÎ (dc). Allow 10 seconds for sources to stabilize. Press and

hold ß. Press . or , until [`YES] appears. Release ß.

3. Press , - [Tc00] shall be displayed.

4. Set the mV source to 0.00 mVÎ (dc), set voltage source to 0.00VÎ (dc). Allow 10 seconds for sources to stabilize. Press and hold

ß. Press . or , until [`YES] appears. Release ß.

5. Press ,. [``Tc] shall be displayed.

6. Set the MV source to 0.00 mV (if using a temperature compensator). Set calibrator to 32°F/0°C.

Set voltage source to 0.00V. Allow 10 seconds for sources to stabilize. Press and hold ß. Press . or , until [`YES] is displayed. Release ß.

Calibration: (RTD) Equipment Required:

• Precision Resistance Box with 0.01Ω Resolution.

1. Remove thermocouple wires from Terminal 1 and Terminal 2.

2. Connect S2 to terminal 1. Connect S1 to Terminal 2.

3. Press ,. [R`15] shall be displayed.

4. Connect voltage source to Terminal 3 negative and Terminal 4 positive.

5. Set the Decade box to 15.00Ω, set the voltage source to 0.00V (Allow 10 seconds for sources to stabilize). Press and hold ß.

Press . or , until [`YES] appears. Release ß.

6. Press , - [R380] shall be displayed.

7. Set the decade box to 380.00Ω, set the voltage source to 5.00V. (Allow 10 seconds for sources to stabilize). Press and hold ß.

Press . or , until [`YES] appears. Release ß.

8. Press and hold . and , for 3 seconds to Exit calibration menu.

Calibrating the 935A and Remote Set Point Input

36 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 Transfer

when errors occur, the control output will continue at a percent output learned while stable. Default = [bPLS] .

[-100] [`100]

Percent Power

(-100% to +100% , depending on heat/cool output configuration). The control will assume a specific output power when input errors occur.

• All except one of the possible displayed error messages are input related.

• If you see [`Er5], cycle power to the controller. If the error persists, call the factory.

• Be aware of the difference between U.S and European thermocouple color/colour codes.

• Reversed polarity input leads is one of the most common errors.

• Incorrect software input choice at the Configuration Menu [CnFG] input [``In] prompt is another common error.

When calling the factory for help, please have:

1. The model number of the control.

2. A photocopy of pages 55 to 62 with the settings

from your control, if possible.

3. Specifications of devices directly interfaced

with the control.

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]

Alarm Silencing

[FAIL}

✓

Failure Mode

[tIM]

Timer Function

[Strt]

Start Timer

[`rdY]

Timer Ready Band

[``St]

Signal Time

[SLOC]

Set Point Lockout

[`tAG]

Lockout Tag

Watlow Series 935A User’s Manual 37

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, place a 110 +/- 10Ω resistor on Terminals 1 and 2. The control should read 100Ω = 32°F, 110Ω = 77°F, 120Ω = 127°F.

• An RTD sensor Series 935A can be configured in software as if it were a thermocouple unit, and then tested as above.

• You can restore factory calibration [`rST], see p. 34-35.

Table 13 - Error Codes and Actions

Display Probable Cause Recommended Action

Reversed thermocouple Change the sensor A-D connection + to –. leads on Terminals 1 and 2. under flow

Sensor type Go to In prompt, check selection (see p. 20), Sensor mismatch or open RTD. or check RTD, replace as necessary. under range

Sensor type Go to In prompt, Sensor mismatch. check selection (see p. 20). over range

Open Thermocouple, bad Check the sensor, A-D connection, or broken wire. replace as necessary. over flow

Electrical noise. Cycle power to system. See if error clears.

Check system for electrical interference.

Control is inoperable. Check for line voltage at

terminals 7 and 8.

Table 14 - Troubleshoot Control Outputs

When indications such as significant differences between set point and actual temperatures point to no output action, check output configurations as described on p. 23. Check wiring, p. 44.

Measure

Output Terminals Load-on State Load-off State

“C” Output 1 3 & 4 LED 1 on LED 1 off

3.0 to 7.0VÎ (dc) 0.0VÎ (dc)

“C” Output 2 5 & 6 LED 2 on LED 2 off

3.0 to 7.0VÎ (dc) 0.0VÎ (dc)

“D” Output 2 5 & 6 LED 2 on LED 2 off

0VÎ (dc) line voltage. Load sees line voltage Load sees 0VÎ (dc)

“K” Output 2 5 & 6 LED 2 on LED 2 off

<2VÎ (dc) line voltage Load sees line voltage Load sees 0VÎ (dc)

[`Er1]

[`Er2]

[`Er3]

[`Er4]

[`Er5]

[````]

38 Watlow Series 935A User’s Manual

Mounting

Layout for

four 1/32 DIN knockouts

with punch and die

Figure 9- Panel Cut-out Dimensions

Figure 10- Mounting Layout for Knockouts

Panel Thickness

1.5 mm to 9.7 mm (0.060 to 0.38 in.)

Punch and Die Supplier

Greenlee Textron, Inc., Phone: 1-800-435-0786.

Catalog Number: 50740180; Available: 4-6 weeks, Greenlee distributor.

12.7mm

(0.500 in.)

45.0mm (1.772 in.)

+0.6mm, -0.0mm

(+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.)

57.7mm

(2.272 in.)

34.9mm

(1.374 in.)

Watlow Series 935A User’s Manual 39

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.)

40 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 the gasket is fully seated in its bezel channel. See Figure 12.

3. While pressing the bezel firmly against the panel, slide the

mounting collar over the back of the control. The tabs on the collar must line up with the mounting ridges on the case for secure installation. See Figure 12 again.

4. Slide the collar firmly against the back of the panel, getting it

as tight as possible. Make sure you cannot move the case within the cutout, if you can, you do not have a IP65/NEMA 4X seal!

5. Make sure you have 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 control. The tabs on each side of the collar have teeth which latch into the ridges. See Figure 12. Each tooth is staggered at a different depth (from the front) so only one of the tabs on each side is ever locked into the ridges at any time.

6. Look at Figure 13; you see that the tabs on one side of the

collar correspond with those on the opposite side. Be sure only the two corresponding tabs are locked in the ridges at the same time. If the matching tabs are not holding the case, no IP65/NEMA 4X seal exists. Make a visual check, or use your finger nail to pull out on each tab. The space between the bezel and panel must be 0 to 0.48 mm (0 to

0.019 in.).

Collar Removal

Slide a thin, wide tool (putty knife) under all three mounting tabs, top then bottom, while pushing forward on the back of the case.

Figure 12- Mounting, Case Top View and Collar Cross Section.

Figure 13- Case Rear View and IP65/NEMA 4X Seal Example

NOTE: To guarantee a proper IP65/NEMA 4X seal, make sure the gasket between the panel and the rim of the case is not twisted and is seated properly. Press firmly.

NOTE: Make sure the rounded side of the D-shaped external case gasket faces the panel surface, and the gasket is fully seated in its bezel channel. See Figure 12.

Bezel

External Gasket

0 to 0.483 mm space (0 to 0.019 in.)

Panel

Ridges

Tabs

Mounting Collar

Teeth

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 41

Terminal Block Removal

42 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 death, or damage to property.

CAUTION: Using grounded thermocouples with non-isolated output switching devices could introduce ground loops into the control system, and possibly damage the controller and product.

NOTE: Torque terminals to 1.36 Nm (12 in lbs).

Power Wiring Input Wiring

OT1IN OT2

–

2–3+45678

High Voltage

OT1IN OT2

–

2–3+45678

Low Voltage

+ -

POWER

100-240

VOLTS

POWER

24-28

VOLTS

OT1IN OT2

–

2–3+45678

Remote Set Point Input

OT1IN OT2

–

2–3+45678

2-wire

3-wire

OT1IN OT2

–

2–3+45678

Thermocouple Input

POWER

Watlow Series 935A User’s Manual 43

∫

CAUTION: Failure to install a 60 to 70Ω, 0.5w resistor across the customer-supplied Front Panel Lock switch will cause the panel to lock out even when the switch is open. Injury to personnel, or damage to equipment or property could result.

∫

NOTE: Switching inductive loads (relay coils, solenoids, etc.) with the mechanical relay or solid-state relay output options requires using an R.C. suppressor. Watlow carries the R.C. suppressor Quencharc brand name, which is a trademark of ITW Pakron. Watlow Part No. 0804-0147-0000.

Output 2 WiringOutput 1 Wiring

See Caution

Internal Circuitry

+5.7 to 8V

Current Limit 60mA

OT1IN OT2

–

2–3+45678

Output 2; Solid State Relay; "K"

POWER

OT1IN OT2

–

2–3+45678

Output 1; Switched DC; "C"

OT1IN OT2

–

2–3+45678

;

POWER

60 to 70Ω, 0.5w resistor

OT1IN OT2

–

+2–3+

45678

Output 2; Electromechanical Relay; "D"

Internal Circuitry

+5.7 to 8V

OT1IN OT2

–

+2–3+4–

Output 2; Switched DC; "C"

5+678

Current Limit 60mA

POWER

Power

44 Watlow Series 935A User’s Manual

System Wiring Examples

Figure 16 - Series 935A System Wiring Examples

∫

CAUTION: Using grounded thermocouples with non-isolated output switching devices could introduce ground loops into the control system, and possibly damage the grounder and product.

120VÅ (ac)

Earth Ground

Series 935

935A-1CD0-000G

OT1IN OT2

–

2–3+45678

POWER

100-240

VOLTS

Fuse

Coil

–

6 5

High Limit

Mechanical

Contactor

DIN-a-mite

DA10-24C0-0000

Heater

21 3456789

Series 146

limit control

146E-1601-1000

10 1112 1314 15 1617

High temperature light

NOCNC

Reset

Limit SensorProcess Sensor

Optional

Normally

Open

Momentary

Switch

Watlow Series 935A User’s Manual 45

Figure 17 - Series 935A Ladder Diagram Wiring Example

∫

2 3 4

Branch

6 7

Circuit Fuse

1 CR-1

9 10 11 12

(+)

(-)

120VÅ (ac)

(+)

12 13

14 15

POWER

OT1 OT2

–

+2–3+

4(–)

456 78

100-240

VOLTS

–

DIN-a-mite

DA10-24C0-C000

13 14

Com

Series 146

146E-1601-1000

Temperature Limit

Heater

1089

1CR

Series 935

935A-1CD0-000G

Temperature

Controller

Hi Temp. Light

46 Watlow Series 935A User’s Manual

Glossary

Alarm

A condition, generated by the controller, indicating that the process 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 surrounding the components of a thermal system.

Auto-tune

Automatically sets PID values to fit a particular thermal system.

Bumpless Transfer

When transferring from auto to manual operation, the control output(s) will maintain the same output level.

Calibration

Adjusting an instrument to a known value.

Configuration Menu

The second software sub menu of the Series 935A Operations Menu; provides a location to set inputs, ranges, output types, alarm type, timer function, failure mode, and lockout types.

Control Mode

The method of control, i.e. ON/OFF, time proportioning, PI, PID or manual.

Cycle Time

Time required for a control to complete one ON through OFF cycle.

Dead Band

Adjusts the effective cool set point above the primary set point by the dead band value in degrees. In cool/heat applications, dead band prevents continuous cool output action by creating a buffer between heating and cooling output action.

Delay OFF

A Series 935A timer output (Output 2) choice that turns the output OFF at the end of the countdown timer time.

Delay ON

A Series 935A timer output (Output 2) choice that turns the output ON at the end of the countdown timer time.

Derivative

Limits the rate of change of the process to eliminate overshoot in slow or lagging loads (de=ra).

Deviation Alarm

An offset value which tracks the set point. Process changes beyond this value register an alarm condition.

DIN-a-mite®

Watlow family of DIN rail-mounted SCR power controllers.

Droop

The difference between the set point and actual values once the system stabilizes.

Hysteresis

A change in the process variable required to re-energize the control or alarm output.

Idle Set Point

Desired control value before and after timing period.

Integral

Accumulates error to eliminate offset or droop (It=1/re).

Local Set Point

Primary set point, not remote.

ON/OFF

Control by turning the output full ON until set point is reached, and then turning OFF until the process error exceeds the hysteresis.

Operations Menu

Series 935A software menu; provides a location to start autotune, set alarm points, set countdown time, choose an idle or normal set point type, choose a local or remote set point input, and to go to the PID or Configuration Menus.

Overshoot

The amount a process variable exceeds set point before stabilizing.

Percent Power Control

Open loop control with output power set at a particular level.

PID

(Proportional, Integral, Derivative). A control mode: proportional action sets the system, integral reduces droop, derivative reduces overshoot and undershoot.

PID Menu

The first software sub menu of the Series 935A Operations Menu; provides a location to manually set values for proportional band, hysteresis, cycle time, integral, derivative, and calibration offset.

Process Alarm

A fixed value independent of set point. Process changes beyond this value register an alarm condition.

Process Error

The difference between the set point and the actual process.

Proportional

Output effort proportional to the error from set point. If the proportional band is 20° and the process is 10° below set point, the heat proportioned effort is 50%. The lower the Pb value, the higher the gain.

Proportional Band

A range in which a control’s proportioning function is active (See PID).

Range

The area between two limits in which a quantity or value is measured. Usually expressed in terms of lower and upper limits.

Watlow Series 935A User’s Manual 47

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 the timer will count down.

Relay, Electromechanical

A power switching device that completes or interrupts a circuit by physically moving electrical contacts. Not recommended for PID control.

Remote Set Point

A 0-5VÎ (dc) input from another controller or other source.

RTD

Resistive Temperature Detector. A sensor whose resistance increases with increasing temperature.Set Point The desired process value programmed into a control.

Signal

Any electrical transmittance that conveys information.

Signal OFF

A Series 935 timer output (Output 2) choice that toggles the output OFF, then ON at the end of the countdown timer cycle for a period equal to the signal time.

Signal ON

A Series 935 timer output (Output 2) choice that toggles the output ON, then OFF at the end of the countdown timer cycle for a period equal to the signal time.

Signal Time

Time duration the timer output will turn ON or OFF after a complete timing period.

SCR

Silicon controlled rectifier. A solid state device, or thyristor, with no moving parts, that is used in pairs to control AC voltages within one cycle. SCRs control voltage from a power source to the load by burst firing (also called zero-cross firing) or phase angle firing.

SSR

Solid State Relay. A solid state switching device that switches current ON and OFF. It has no moving parts.

Thermal System

A regulated environment consisting of a heat source, heat transfer medium, sensing device, a control instrument, and a redundant control device (limit).

Thermocouple

A temperature sensing device made by joining two dissimilar metals. This junction produces an electrical voltage in proportion to the difference in temperature between the hot junction and lead wire connection to the sensing device (cold junction).

Undershoot

The amount a process variable falls below set point before stabilizing.

48 Watlow Series 935A User’s Manual

Index

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] 24

Bumpless Transfer [bPLS] 36

Calibration 34

Factory Restore [`rST] 34 Calibration Offset [`CAL] 13 Celsius / Fahrenheit [`C_F] 20 Clearing Alarms 26, 27 Configuration [CnFG] 16 Cycle Time 13

Heat [Ct`h] 13

Cool [Ct`c] 13

Dead Band [``db] 13 Derivative [``dE] 13 Dimensions 38, 39

DIN-a-mite

compatibility 44, 50, 51

Display Default [dISP] 16, 20

Errors 8, 37

Failure Mode [FAIL] 17, 36 Front Panel Lock [`FPL] 20, 23

Glossary 46

Hours/Minutes [thM] 16, 28 Hysteresis

Alarm [AhYS] 17, 24 Heat [hYSh] 13 Cool [hYSc] 13

Idle [IdLE] 10 Idle Set Point Track [trAc] 10 Input Range Low [``rL] 20 Input Range High [``rh] 20 Input Type [``In] 21 Integral [`It] 13

Keys 5

Latch [`LAt] 17, 24, 27 Local / Remote [`L-r] 10 Lockout Functions 18

Front Panel [`FPL] 18, 23 Security Tag [`tAG] 18 Set Point [SLOC] 18

Minutes/Seconds [tMS] 17, 28 Mounting 38

Operations, Learning 10 Ordering Information 51 Output 1 Function [`Ot1] 3, 20 Output 2 Function [`Ot2] 3, 20

PID Menu, Learning 12 PID Settings, Tweaking 33 Proportional Band

Heat [Pb`h] 13 Cool [Pb`c] 13

Remote Set Point [`rSP] 20, 22

Watlow Series 935A User’s Manual 49

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

Terminal Block Removal 41 Timer

Countdown [tMr] 10, 28-31

Delay off [dLoF] 17, 28

Delay on [dLon] 17, 28

Function [tIM] 17, 28

Hours/Minutes [thM] 17, 28

Idle [IdLE] 17, 28 Minutes/Seconds [tMS] 17, 28 Ready Band [`rdY] 17, 28 Signal off [SGof] 17, 28 Signal on [SGon] 17, 28 Signal Time [``St] 17, 28 Start Timer [Strt] 17, 28

Immediate [IMd] 17, 28 Ready Band [`rDY] 17, 28 Ready Band-

Acknowledge [rdYA] 17, 28

Tuning

Auto-tuning 10, 32 Manual tuning 32

Troubleshooting 36

Wiring 42-43 Wiring Examples 44-45

50 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.

• IP65/NEMA 4X2rated front panel.

• CE approved:

•89/336/EEC Electromagnetic Compatibility Directive:

EN61326 Industrial Immunity, Class A Emissions

•73/23/EEC Low-voltage Directive: EN 61010-1: 1993 Safety.

Operator Interface

• Single, seven-segment digital display, factory selectable red or green.

• Outputs/operation annunciators, three discrete LEDs.

• Three tactile feedback momentary switches.

• Front panel lock dry contact closure disables front panel operation.

Accuracy

• ±0.25% of span, ± 1 LSD, or

• Types S and T thermocouple @ < 200°C, ±0.32% of span, ± 1 LSD,

typical.

Ambient Rejection

• < 0.15°C/°C rise in ambient, or

• Types S and T thermocouple, @ < 0.47°C/°C rise in ambient typical.

Sensors/Inputs

• Sensor input sampling rate: 10 samples/second (10Hz).

• Type E, J, K, N, S and T thermocouple, grounded or ungrounded

junction.

• RTD, 100Ω platinum two-wire , DIN curve

• Remote set point input, field-selectable,

0-5VÎ (dc), scalable, 10kΩ input impedance. (Remote Input Option A only.)

• Remote timer start dry contact closure initiates timer start. (Remote Input Option B only.)

Input Range

Specified temperature ranges represent the controller’s operational span.

Thermocouple

Type E -200 to 799°C

(-328 to 1470°F)

Type J 0 to 750°C

(32 to 1382°F)

Type K -200 to 1250°C

(-328 to 2282°F)

Type N 0 to 1250°C

(32 to 2282°F)

Type S 0 to 1450°C

(32 to 2642°F)

Type T -200 to 350°C

(-328 to 662°F)

RTD Resolution Platinum 0.00385 Curve

1° -200 to 700°C

(-328 to 1292°F)

0.1° -128.8 to 537.7°C (-199.9 to 999.9°F)

Control Output

• Output update rate: 1/second (1Hz).

1 Output/Remote Input

• Switched dc logic signal, 6VÎ (dc) @ 60mA nominal, short circuit pro-

tected, non-isolated. (Watlow DIN-a-mite® power controller compatible).

2 Output

• Switched dc logic signal, 6VÎ (dc) @ 60mA nominal, short circuit pro-

tected, non-isolated (Watlow DIN-a-mite® power controller compatible).

• Electromechanical

relay, Form A, 2A @ 30VÎ (dc) or, 240V~ (ac), with-

out contact suppression

. (Remote Input Option A only.)

• Solid-state relay, Form A, 0.5A, 24 to 264V~ (ac), without contact

suppression

. Off-state output impedance 31MΩ. (Remote Input Option

A only.)

Output Cycle Time

• Switched dc and solid-state relay; 5.0 second default, 0.1 second

minimum.

• Electromechanical relay; 30.0 second default, 5.0 second minimum.

Line Voltage/Power

• 100-240V~ (ac) +10%, -15%; (85-264V~ [ac]) 50/60Hz, ±5%.

• 24-28Vı (ac/dc) +10%, -15%; (20-31Vı [ac/dc]) 50/60Hz, ±5%.

(Remote Input Option A only.)

• Fused internally (factory replaceable only) time-lag type, 2A, 250V.

• Power consumption 6VA maximum.

• Data retention upon power failure via non-volatile memory.

• Switching supply speed 45kHz, ±5kHz.

Operating Environment

• 0 to 65°C (32 to 149°F).

• 0 to 90% RH, non-condensing.

Storage Temperature

• -40 to 85°C (-40 to 185°F).

Terminals

• Touch-safe set screw type, accepts 0.5 to 4mm2(22 to 12 AWG

wire). Torque to 0.1 Nm (4.5 in lbs).

Controller Weight

• 113 g (4.0 oz).

Shipping Weight

• 207 g (7.3 oz).

These specifications are subject to change without prior notice.

Watlow Series 935A User’s Manual 51

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 #1 B = Separate input for remote timer start, or front panel lock

Output 1/Remote Input

C = Switched dc, logic signal, non-isolated; (Watlow DIN-a-mite® power

controller compatible)

(Optionally used for remote set point input; or front panel lock input for Remote Input A option only.)

Output 2

C = Switched dc, logic signal, non-isolated (Watlow DIN-a-mite® power

controller compatible)

D = Electromechanical relay

, Form A, 2A, 240VÅ (ac), without contact

suppression

(Remote Input A option only.)

K = Solid-state relay, 0.5A, 24-264VÅ (ac), without contact suppression

(Remote Input A option only.)

Power Supply

0 = 100 to 240VÅ (ac) nominal (high voltage) 1 = 24 to 28V‡ (ac/dc) nominal (low voltage)(Remote Input A option only.)

Custom Options

00 = None AA = No Watlow logo XX = Custom label or parameters

Display

R = Red displays G = Green displays

Table 15 - Input Range Information

Electromechanical relays are warranted for 100,000 closures only. Solid-state switching devices are recommended for applications requiring fast cycle times or extended service life.

To effect IP65 (NEMA 4X) rating requires a minimum mounting panel thickness of 1.5mm (0.06 inch) and a surface finish not rougher than

0.000812 mm (0.000032 in.).

When using this output to drive a solenoid, MDR or electromechanical relay (contactor), protect output with a Quencharc

. Order code number

0804-0147-0000. Refer to owner's manual for wiring information. Quencharc®is a registered trademark of ITW Paktron.

J t/c: 0 to 750°C or 32 to 1382°F K t/c: -200 to 1250°C or -328 to 2282°F T t/c: -200 to 350°C or -328 to 662°F N t/c: 0 to 1250°C or 32 to 2282°F S t/c: 0 to 1450°C or 32 to 2642°F E t/c: -200 to 799°C or -328 to 1470°F 1° RTD (DIN): -200 to 700°C or -328 to 1292°F

0.1° RTD: -99.9 to 700.0°C or -99.9 to 999.9°F

935 -1C - 0

52 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)

Classification: Temperature control, Installation Category II,

Pollution degree II Rated Voltage: 100 to 240 V~ (ac) or 24 to 28 V ‡ (ac or dc) Rated Frequency: 50 or 60 Hz Rated Power Consumption: 6 VA maximum

Meets the essential requirements of the following European Union Directives by using the relevant standards show below to indicate compliance.

89/336/EEC Electromagnetic Compatibility Directive

EN 61326:1997 With A1:1998 – Electrical equipment for measurement, control and laboratory use – EMC requirements (Industrial Immunity, Class A Emissions).

EN 61000-4-2:1996 With A1, 1998 – Electrostatic Discharge Immunity EN 61000-4-3:1997 – Radiated Field Immunity EN 61000-4-4:1995 – Electrical Fast-Transient / Burst Immunity EN 61000-4-5:1995 With A1, 1996 – Surge Immunity EN 61000-4-6:1996 – Conducted Immunity EN 61000-4-11:1994 Voltage Dips, Short Interruptions and Voltage Variations

Immunity EN 61000-3-2:1995 With A1-3:1999 – Harmonic Current Emissions EN 61000-3-3:1995 With A1:1998 – Voltage Fluctuations and Flicker

73/23/EEC Low-Voltage Directive

EN 61010-1:1993 With A1:1995 Safety Requirements of electrical equipment for measurement, control and laboratory use. Part 1: General requirements

déclare que le produit suivant : Français

Désignation : Série 935 Numéros de modèle : 935(A ou B) – 1C(C, D ou K)(0 ou 1) – (N’importe

quelle combinaison de quatre lettres ou chiffres)

Classification : Régulation de température, Catégorie d’installation II,

Degré de pollution II Tension nominale : 100 à 240 V~ (c.a) ou 24 à 28 V ‡ (c.a ou c.c) Fréquence nominale : 50 ou 60 Hz Consommation d’alimentation nominale: 6 VA maximum

Répond aux normes essentielles des directives suivantes de l'Union européenne en utilisant les standards normalisés ci-dessous qui expliquent les normes auxquelles répondre :

Directive 89/336/CEE sur la compatibilité électromagnétique

EN 61326:1997 avec A1 :1998 – Matériel électrique destiné à l’étalonnage, au contrôle et à l’utilisation en laboratoire – Exigences CEM (Immunité industrielle, Émissions de catégorie A).

EN 61000-4-2:1996 Avec A1, 1998 – Immunité aux décharges électrostatiques EN 61000-4-3:1997 – Immunité aux champs de radiation EN 61000-4-4:1995 – Immunité contre les surtensions électriques rapides/ Rafale EN 61000-4-5:1995 avec A1, 1996 – Immunité contre les surtensions EN 61000-4-6:1996 – Immunité conduite EN 61000-4-11:1994 Immunité contre les écarts de tension, interruptions courtes et variations de tension EN 61000-3-2:1995 avec A1-3 :1999 – Emissions de courant harmoniques EN 61000-3-3:1995 avec A1 :1998 – Fluctuations et vacillements de tension

Directive 73/23/CEE sur les basses tensions

EN 61010-1:1993 avec A1 :1995 Normes de sécurité du matériel électrique pour la mesure, le contrôle et l’utilisation en laboratoire. 1ère partie : Conditions générales

Erklärt, dass das folgende Produkt: Deutsch Bezeichnung: Serie 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 Nennspannung: 100 bis 240 V~ (ac) oder 24 bis 28 V ‡ (AC oder DC) Nennfrequenz: 50/60 Hz. Nennstromverbrauch: 6 VA max.

Erfüllt die wichtigsten Normen der folgenden Anweisung(en) der Europäischen Union unter Verwendung des wichtigsten Abschnitts bzw. der wichtigsten Abschnitte die unten zur Befolgung aufgezeigt werden.

89/336/EEC Elektromagnetische Kompatibilitätsrichtlinie

EN 61326:1997 mit A1:1998 – Elektrisches Gerät für Messung, Kontrolle und Laborgebrauch – EMV-Anforderungen (Störfestigkeit Industriebereich, Klasse A Emissionen)

EN 61000-4-2:1996 mit A1, 1998 – Störfestigkeit gegen elektronische Entladung EN 61000-4-3:1997 – Störfestigkeit gegen Strahlungsfelder EN 61000-4-4:1995 – Störfestigkeit gegen schnelle Stöße/Burst EN 61000-4-5:1995 mit A1, 1996 – Störfestigkeit gegen Überspannung EN 61000-4-6:1996 – Geleitete Störfestigkeit EN 61000-4-11:1994 Störfestigkeit gegen Spannungsabfall, kurze Unterbrechungen und Spannungsschwankungen EN 61000-3-2:1995 mit A1-3:1999 – Harmonische Stromemissionen EN 61000-3-3:1995 mit A1:1998 – Spannungsfluktationen und Flimmern

73/23/EEC Niederspannungsrichtlinie

EN 61010-1:1993 mit A1:1995 Sicherheitsanforderungen für elektrische Geräte für Messungen, Kontrolle und Laborgebrauch. Teil 1: Allgemeine Anforderungen

Declara que el producto siguiente: Español

Designación: Serie 935 Números de modelo: 935(A o B) – 1C(C, D o K)(0 o 1) – (Cualesquiera

cuatro letras o números)

Clasificación: Control de temperatura, Categoría de instalación II,

Grado de contaminación II Voltaje nominal 100 a 240 V~ (CA) o 24 a 28 V ‡(CA o CD) Frecuencia nominal: 50 o 60 Hz Consumo de energía nominal: 6 VA máximo

Cumple con los requisitos esenciales de las siguientes Directrices de la Unión Europea mediante el uso de las normas aplicables que se muestran a continuación para indicar su conformidad.

89/336/EEC Directriz de compatibilidad electromagnética

EN 61326:1997 CON A1:1998.– Equipo eléctrico para medición, control y uso en laboratorio – Requisitos EMC (Inmunidad industrial, Emisiones Clase A).

EN 61000-4-2:1996 con A1, 1988 – Inmunidad a descarga electrostática EN 61000-4-3:1997 – Inmunidad a campo radiado EN 61000-4-4:1995 – Inmunidad a incremento repentino/rápidas fluctuaciones eléctricas transitorias EN 61000-4-5:1995 con A1, 1996 – Inmunidad a picos de voltaje o corriente EN 61000-4-6:1996 – Inmunidad por conducción EN 61000-4-11:1994 Inmunidad a caídas de voltaje, variaciones y pequeñas interrupciones de voltaje EN 61000-3-2:1995 con A1-3:1999 – Emisiones de corriente armónica EN 61000-3-3:1995 con A1:1998 – Fluctuaciones de voltaje y centelleo.

73/23/EEC Directriz de bajo voltaje

EN 61010-1:1993 con A1:1995 Requisitos de seguridad de equipo eléctric para medición, control y uso en laboratorio. Parte 1: Requisitos generales

(2193)

Jim Boigenzahn Winona, Minnesota, USA Name of Authorized Representative Place of Issue

General Manager

August, 2001

Title of Authorized Representative Date of Issue

________________________________________ Signature of Authorized Representative

Watlow Series 935A User’s Manual 53

Notes

54 Watlow Series 935A User’s Manual

Notes

Watlow Series 935A User’s Manual 55

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 is an Idle Set Point equal to the Primary Set Point; or select a value between Input Type Range Low and Input Type Range High.

[idLE]

Idle Set Point Type

[`tA9] = [`O``]; or if

[`Ot2] ≠ [thM] or [tMs]

[0000]

Select a countdown time value, adjustable between 00:00 and 99:59 hrs:mins or min:sec.

[tMr]

Countdown Timer

[`tA9] = [`O``]; or if

[`Ot1] and [`Ot2] ≠ [ALM]

Type J Range High[`RL0]

Select a value, adjustable between Alarm Low and Range High.

[`Ah1]

Alarm High

[`tA9] = [`O``]; or if

[`Ot1] and [`Ot2] ≠ [ALM]

Type J Range Low[`Ah1]

Select a value, adjustable between Range Low and Alarm High.

[`ALO]

Alarm Low

[`tA9] = [```A]no[``no] [`YES]

Choose YES to Autotune the 935A.

[`Aut]

Auto-tune

Appears always

75°F or 23°C[``rL] [``rh]

Select a value, adjustable between Input Type Range Low and Input Type Range High.

[``SP]

Primary Set Point

56 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 999.0°F or 0.1°C to

555.0°C).

[hYSh]

Hysteresis Heat

[`tA9] = [P```];

or if

[`Ot1] and/or [`Ot2]

≠ [hEAt]

25°F or 17°C

[```0] [`999]

[```0] [`555]

[``)0] [99(0]

[``)0] [55%0]

Select a value in whole degrees (0°F to 999°F or 0°C to 555°C) or in tenths of degrees (0.0°F to 999.0°F or 0.0°C to

555.0°C).

[`Pb`h]

Proportional Band Heat

The front panel is locked

out.

no[``no] [`YES]

Choose YES to move to the Configuration Menu.

[CnFg]

Configuration Menu

[`tA9] = [P```]no[``no] [`YES]

Choose YES to move to the PID Menu.

[`Pid]

PID Menu

[`tA9] = [`O``];

or if

[`Ot1] ≠ [`rSP]

L[```L] [```r]

Choose Local or Remote Set Point.

[`L-r]

Local/Remote Set Point

PID Menu

Watlow Series 935A User’s Manual 57

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 or 0.1°C to

555.0°C).

[hYSc]

Hysteresis Cool

[`tA9] = [P```]; or if

[`Ot1] ≠ [cool]

and/or

[`Ot2] ≠ [cool]

25°F or 17°C

[```0] [`999]

[```0] [`555]

[``)0] [99(0]

[``)0] [55%0]

Select a value in whole degrees (0°F to 999°F or 0°C to 555°C) or in tenths of degrees (0.0°F to 999.0°F or 0.0°C to

555.0°C).

[Pb`c]

Proportional Band Cool

[`tA9] = [P```]; or if

[`Ot1] = [cool] and [`Ot2] ≠ [hEAt];

or if

[`Ot1] = [hEAt] and [`Ot2] ≠ [cool]

0°F or 0°C[```0] [`999]

[```0] [`555]

[``)0] [99(0]

[``)0] [55%0]

Select a value in whole degrees (0°F to 999°F or 0°C to 555°C) or in tenths of degrees (0.0°F to 999.0°F or 0.0°C to

555.0°C).

[``db]

Dead Band

[`tA9] = [P```]; or if [Pb`h] = 0

1.0 second

[``)1] [`6)0]

[``%0] [`6)0]

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).

[Ct`h]

Cycle Time Heat

58 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 actual temperature.

[`CAL]

Calibration Offset

[`tA9] = [P```]; or if [Pb`h] = 0; or if [Pb`h] is hidden; and

if [Pb`c] = 0; or if [Pb`c] is hidden

0 minutes

[`)00] [`(99]

Select a value, adjustable between 0.00 and 9.99 minutes.

[``dE]

Derivative Function

[`tA9] = [P```]; or if [Pb`h] = 0; or if [Pb`h] is hidden; and

if [Pb`c] = 0; or if [Pb`c] is hidden

5.00 minutes/repeat

[``)0] [9(99]

Select a value, adjustable between 0.0 and 99.99 minutes/repeat.

[``It]

Integral Function

[`tA9] = [P```]; or if [Pb`c] = 0 or if [Pb`c] is hidden

5.0 seconds

[``)1] [`6)0]

[``%0] [`6)0]

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).

[Ct`c]

Cycle Time Cool

Watlow Series 935A User’s Manual 59

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 high value[``rL] [``In]

Select a value between Input Type Range High and Input Range Low.

[``rh]

Range High

[`tA9] = [``C`]Type J range low value[``In] [``rh]

Select a value between Input Type Range Low and Input Range High.

[``rL]

Range Low

[`tA9] = [``C`]F[``°F] [``°C]

Choose to indicate temperature in °Fahrenheit or °Celsius.

[`C_F]

Celsius/Fahrenheit

[`tA9] = [``C`]

[```J] J t/c [```H] K t/c [```t] T t/c [```N] N t/c [```E] E t/c [```S] S t/c [`rtd] 1.0°RTD [`rtd] 0.1°RTD

[``In]

Input Type

60 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 degrees (0.1°F to 999.0°F or 0.1°C to

555.0°C).

[AhYS]

Alarm Hysteresis

[`tA9] = [``C`]; or if

[`Ot1] and/or [`Ot2] ≠ [ALM]

Prnc

[Prnc] [Prno]

[dEnc] [dEno]

Choose an alarm type: Process normally closed, Process normally open, Deviation normally closed or Deviation normally open.

[ALtY]

Alarm Type

[`tA9] = [``C`]

[``Ac] [AcSP]

[Act1] [t1Ac]

[t1SP]

Choose the primary (last 2 characters) and secondary (first 2 characters) Default displays. Press ß to toggle to the secondary display for 15 seconds.

[dISP]

Display Default

[`tA9] = [``C`]

none

[hEAt] [COOL]

[ALM] [`thM]

[tMS] [nonE]

Choose Heat, Cool, Alarm, Timer (Hrs:Min), Timer (Min:Sec) or No output action.

[`Ot2]

Output 2 Function

Watlow Series 935A User’s Manual 61

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 0°C to 555°C) or in tenths of degrees (0.0°F to

999.0°F or 0.0°C to

555.0°C).

[`rdY]

Timer Ready Band

[`tA9] = [``C`]; or if

[`Ot2] ≠ [thM] or [tMS]

Immediate

[IMd] [`rdY]

[rdYA] [PWr]

Choose Immediate, Ready Band, Ready Band Acknowledge, or Power.

[Strt]

Start Timer Function

[`tA9] = [``C`]; or if

[`Ot2] ≠ [thM] or [tMS]

Delay OFF[dLon] [dLoF]

[SGon] [SGoF]

Choose Delay ON, Delay OFF, Signal ON, or Signal OFF.

[tIM]

Timer Output Function

[`tA9] = [``C`]; or if

[`Ot1] and [`Ot2] ≠ [hEAt] or [cooL]

Bumpless[bPLS] [-100]

[`100]

Choose Bumpless Transfer or Percent Power.

[FAIL]

Input Failure Mode

[`tA9] = [``C`]; or if

[`Ot1] and/or [`Ot2] ≠ [ALM]

no[``no] [`YES]

Choose YES for a Silenced Alarm on startup or silencing during operation.

[`SIL]

Alarm Silencing

[`tA9] = [``C`]; or if

[`Ot1] and/or [`Ot2] ≠ [ALM]

no[``no] [`YES]

Choose YES for a Latching Alarm.

[`LAt]

Alarm Latch

62 Watlow Series 935A User’s Manual

Configuration Menu

Prompt Range Default Hidden if * Your Settings

Always appears

[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 cannot be changed.

P = PID Menu C = Configuration Menu

(except tag) O = Operations Menu (except [CnFg]) A = Auto-tune

[`tA9]

Lockout Tag

[`tA9] = [``C`]no[``no] [`YES]

Choose YES to Lock the Primary Set Point.

[SLOC]

Set Point Lockout

[`tA9] = [``C`]; or if

[tIM] ≠ [SGon] or [SGof]

00:01[```1] [9( 9]

If [t1M] = [SGon] or [SGof], then select a value between 00:01 and 99:59 min:sec.

[``St]

Signal Time

Watlow Series 935A User’s Manual 63

Notes

64 Watlow Series 935A User’s Manual

Notes

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. These OEMs and end users depend upon Watlow Winona to provide compatibly engineered controls that they can incorporate into their products with confidence. Watlow Winona resides in a 100,000-square-foot marketing, engineering and manufacturing facility in Winona, Minnesota.

Warranty

The Watlow Series 935 is warranted to be free of defects in material and workmanship for 36 months after delivery to the first purchaser for use, providing that the units have not been misapplied. Since Watlow has no control over their use, and sometimes misuse, we cannot guarantee against failure. Watlow's obligations hereunder, at Watlow's option, are limited to replacement, repair or refund of purchase price, and parts which upon examination prove to be defective within the warranty period specified. This warranty does not apply to damage resulting from transportation, alteration, misuse, or abuse.

Returns

• Call or fax your distributor or the nearest Watlow sales office for best information about returns. (See outside back cover.)

• To return directly to Watlow Winona in the U.S., first call or fax Customer Service for a Return Material Authorization (RMA) number (telephone: +1 (507) 454-5300; fax: +1 (507) 452-4507).

• Put the RMA number on the shipping label, along with on a written description of the problem.

• A restocking charge of 20% of the net price is charged for all standard units returned to stock.

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, Postfach 1165, Kronau 76709 Germany Telephone: +49 7253-9400 0 Fax: +49 7253-9400 44

Watlow France S.A.R.L. Immeuble Somag, 16 Rue Ampère, 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 México Av. Fundición #5, Col. Parques Industriales, Querétaro, Qro. México 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, Fl. 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. Hanil Bldg., 3rd Floor 210-5 Yangje-Dong Seocho-Gu Seoul, 137-130 Korea 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

Your Authorized Watlow Distributor:

TOTAL

CUSTOMER

SATISFACTION

3 Year Warranty

Watlow 935A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Series 935A

Safety Information in this Manual

Your Comments

Table of Contents

Introduction

Read or change

Begin Controlling

Change Set Point

Respond to a simple error

Learn the Software Map

Learn the Operations Menu

Learn the PID Menu

Learn the PID Menu - Details

Learn the Configuration Menu

Using Lockout Functions

Setting Inputs and Outputs

Set Up Remote Set Point Input

Set Up Front Panel Lockout

Learning Alarms

Setting Alarms

Learn the Countdown Timer

Setting the Countdown Timer

Timer Example

Auto-tuning

Fine Tune the PID Settings

Calibrating the 935A

Errors and Troubleshooting

Mounting

Dimensions

Installation Procedure

Terminal Block Removal

Wiring a 935A

System Wiring Examples

Glossary

Index

Specifications

Ordering a 935A

Declaration of Conformity

935A Software Map

About Watlow Winona

Warranty

Returns

How to Reach Us