Watlow SD31 User Manual

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User’s Manual

Registered Company

Winona, Minnesota USA

ISO 9001

TOTAL

3 Year Warranty

CUSCUSTOMERER

SATISFTISFACTICTION

Series SD31

Single Display PID Controller

with Optional Countdown Timer

1241 Bundy Boulevard., Winona, Minnesota USA 55987

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

0600-0041-0010 Rev. C Made in the U.S.A.

January 2007 $15.00

Safety Information

We use note, caution and warning symbols throughout this book to draw your attention to important operational and safety information.

A “NOTE” marks a short message to alert you to an important detail.

A “CAUTION” safety alert appears with information that is important for protecting your equipment and performance. Be especially careful to read and follow all cautions that apply to your application.

A “WARNING” safety alert appears with information that is important for protecting you, others and equipment from damage. Pay very close attention to all warnings that apply to your application.

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

The electrical hazard symbol, Ó (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 your configuration information to verify that your selections are consistent with your application: inputs, outputs, alarms, limits, etc. If the problem persists, you can get technical assistance from your local Watlow representative (see back cover), by e-mailing your questions to wintechsupport@wat

low.com or by dialing +1 (507) 494-5656 between 7 a.m. and 5 p.m., Central Standard Time (CST). Ask for for an Applications Engineer. Please have the following information available when calling:

• Complete model number • All configuration information

• User’s Manual • Factory Page

Warranty

The Series SD31 is manufactured by ISO 9001-registered processes and is backed by a threeyear warranty.

Return Material Authorization (RMA)

1. Call Watlow Customer Service, (507) 454-5300, for a Return Material Authorization (RMA) number before returning any item for repair. If you do not know why the product failed, contact an Application Engineer or Product Manager. All RMA’s require:

• Ship to address • Bill to address

• Contact name • Phone number

• Method of return shipment • Your P.O. number

• Detailed description of the problem • Any special instructions

• Name and phone number of person returning the product.

2. Prior approval and an RMA number, from the Customer Service Department, is needed when returning any unused product for credit. Make sure the RMA number is on the outside of the carton and on all paperwork returned. Ship on a Freight Prepaid basis.

3. After we receive your return, we will examine it and try to verify the reason for returning it.

4. In cases of manufacturing defect, we will enter a repair order, replacement order or issue credit for material returned. In cases of customer mis-use, we will provide repair costs and request a purchase order to proceed with the repair work.

5. To return products that are not defective, goods must be be in new condition, in the original boxes and they must be returned within 120 days of receipt. A 20 percent restocking charge is applied for all returned stock controls and accessories.

6. If the unit is unrepairable, you will receive a letter of explanation. and be given the option to have the unit returned to you at your expense or to have us scrap the unit.

7. Watlow reserves the right to charge for no trouble found (NTF) returns.

CAUTION or

WARNING

Electrical

Shock Hazard

CAUTION or WARNING

Watlow Series SD31 ■ 1 ■ Table of Contents

Chapter 1: Overview . . . . . . . . . . . . . . . . . . . . . . . . . .2

Chapter 2: Install and Wire . . . . . . . . . . . . . . . . . . . . .4

Chapter 3: Keys and Displays . . . . . . . . . . . . . . . . .14

Home Page Overview . . . . . . . . . . . . . . . . . . . . . .15

Adjusting the control set point . . . . . . . . . . . . . . . .15

Operations Page Overview . . . . . . . . . . . . . . . . .16

Setup Page Overview . . . . . . . . . . . . . . . . . . . . . .17

Programming Page Overview . . . . . . . . . . . . . . . .18

Factory Page Overview . . . . . . . . . . . . . . . . . . . . .18

Chapter 4: Home Page . . . . . . . . . . . . . . . . . . . . . . .19

Chapter 5: Setup Page . . . . . . . . . . . . . . . . . . . . . . .21

Chapter 6: Operations Parameters Table . . . . . . . .29

Chapter 7: Programming Page . . . . . . . . . . . . . . . . .34

Chapter 8: Countdown Timer . . . . . . . . . . . . . . . . . .36

Chapter 9: Factory Page and Calibration . . . . . . . .43

Chapter 10: Features . . . . . . . . . . . . . . . . . . . . . . . . .48

Saving and Restoring User Settings . . . . . . . . . . .49

Operations Page . . . . . . . . . . . . . . . . . . . . . . . . . .49

Autotuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

Manual Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . .50

Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50

Control Methods . . . . . . . . . . . . . . . . . . . . . . . . . .52

Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

Communications . . . . . . . . . . . . . . . . . . . . . . . . . .58

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . .60

Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . .62

Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

Ordering Information . . . . . . . . . . . . . . . . . . . . . . .65

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66

Prompt Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68

Declaration of Conformity . . . . . . .Inside Back Cover

Table of Contents

Watlow Series SD31 ■ 2 ■ Chapter 1 Overview

The Watlow Series SD31 PID, is a microprocessorbased temperature controller available in the 1/32 DIN panel mount size. The Series SD31 has a single, universal input that accepts various thermocouples, RTDs (resistive temperature devices) or process inputs. (See the Specifications in the Appendix for further details).

The Series SD31 PID controller offers up to two outputs. Outputs can be configured as heat, cool, timer, retransmit, alarm or off (deactivated). The control outputs can be independently configured for PID or OnOff control. PID settings include proportional band, reset (or integral) and rate (or derivative).

Standard Series SD31 features include an IP65/ NEMA 4X front panel rating; CE compliance, UL, CUL, CSA and NSF agency approvals: single, four-digit displays in red or green; autotuning for heat and cool outputs; ramp to set point, to gradually warm up your thermal system; and automatic/manual capability with bumpless transfer. A low-voltage model is also available.

Advanced features include Modbus, EIA-485 serial communications to interface with PC software applications; and INFOSENSE™ technology that provides low-cost, high-accuracy thermal sensing.

Other operator-friendly features include LED indicators to aid in monitoring and setting up the controller, as well as a calibration offset at the front panel. The Watlow Series SD31 automatically stores all information in non-volatile memory and provides an additional back-up for user-selected settings.

For more information on these and all other product features, refer to the Features Chapter and the Appendix.

Features and Benefits

INFOSENSE™ Technology

• Improves sensor accuracy by a minimum of 50%.

User Definable Menu System

• Simplifies operator interface

User Definable Default Settings

• Restores to user defined controller settings

Advanced Control Algorithm

• Improved process control. WATVIEW™ Software

• Operation, configuration and data logging with a standard Windows®PC.

Up to Two Outputs

• Application versatility.

• Configuration flexibility.

Ramp to Set Point

• Controls the rate of temperature changes.

Countdown Timer

• Optional countdown timer

Overview

Figure 2 — Series SD31 inputs and outputs.

Output

Control Inpu

ontrol or Alar

Output

Control, Alarm or Communication

Watlow Series SD31 ■ 3 ■ Chapter 1 Overview

How to use the Series SD31 controller

Before you use your Series SD31 controller, it must

be installed and configured correctly. Which setup

steps you need to perform will depend on how you will use it.

If you purchased the controller to design into your products:

You will need to do the first three steps and maybe some of the fourth step. Some wiring, such as the final wiring of a communications connection or an alarm output for signaling an external device, might be left to the end user. In highly specialized applications with little variation in operation and heat load, the OEM might configure almost all the parameters.

If you purchased the controller to design and install into new equipment for your own use or to retrofit into existing equipment:

You will need to complete all four steps.

If you purchased the controller installed in equipment designed around it:

You will probably only need to do the fourth step. In some instances, you may need to wire it for serial communications and/or an alarm output. Some serial communications parameters on the Setup Page may need to be changed.

Step 1: Mount and install the controller.

The Series SD31 controller is designed to be panel mounted in a standard DIN opening. It is a 1/32 DIN size controller. Cut the correct size hole into the panel and mount the controller, using its mounting brackets. See Chapter Two for details on installation and mounting.

If you retrofit the Series SD31 controller into an existing application, you may need to use a Watlow adapter plate to adapt it to the smaller controller size.

Step 2: Wire the controller.

The controller will need to have its power, input and output wiring installed. The wiring depends on the specific model number of the Series SD31 controller. The dimension illustrations in Chapter Two show the location of the model number. Use the model number to determine which wiring diagrams to follow for your controller. See Chapter Two for wiring details.

Step 3: Configure the Setup Page.

Setup Page parameters tell the controller what input and output devices are wired to the controller and how the controller should function. Without the proper Setup Page settings, the controller will not operate or could operate erratically. Since these settings require detailed knowledge on the wiring and operation of the equipment, the OEM or the designer normally programs these parameters. Some settings, such as the baud rate or controller address, are Setup Page parameters, but would probably be set by the end user.

These settings should be recorded for future refer-

ence. The settings can also be stored using the [Us;rS] parameter, on the Factory Page. For saving and restoring parameters, see Chapter Eight, Features. For details on configuring the Setup Page, see Chapter Five, Setup Page.

Step 4: Configure the Operations Page.

The Operations Page contains the parameters that the equipment operator may need to set or change from time to time. This includes calibration offset, autotune, PID parameters and alarm set points. In some cases the OEM manufacturer may set most of these parameters because the equipment operates with little variation (i.e., always the same temperature, always the same heat load). In equipment where demands could vary significantly, the OEM may leave parameter adjustments to the end user (i.e., many different temperature settings, different heat loads).

The Operations Page on the Series SD31 controller is customizable so that only the parameters that the operator may need to use will appear in the display. Settings that won’t need to be adjusted can be hidden from the operator, using the Programming Page. For more details on the Programming Page, see Chapter Eight, Features. For details on configuring parameters on the Operations Page, see Chapter Six, Operations Parameters Tables. Once you have verified the controller is operating properly, be sure to document all of your parameter settings. Each parameter table has

a settings column for you to write in your values.

Caution: Follow the installation procedure exactly 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. Failure to do so could result in damage to equipment.

Note: Contact your local Greenlee supplier for the appropriate punch kit and cutout tools required for rapid mounting.

To remove spring clamp connector, pull straight back.

To remove screw clamp connector, pull straight up.

Spring clamp wiring connector note: To insert the wire, push the wire into the desired connection number, and it should automatically lock into place. To remove the wire, press and hold the orange release tab with a small screwdriver. Pull the wire out of the connection. Solid or tinned wire recommended.

Watlow Series SD31 ■ 4 ■ Chapter 2 Install and Wire

Install and Wire

Series SD31 Controller Dimensions

100.9 mm (3.98 in)

Ridges

Tabs with Teeth

Model Number

Customer Front Panel

0.48 mm (0.019 in) maximum gap between controller front and customer front panel

8.6 mm (0.34 in)

Front

Top

Back

Figure 4a — Dimensions

SET

Figure 4c — SD31 with other than a Universal Process Output installed for output 1 (S D 3 1 - _ (C,K or J) _ _ - _ _ _ _).

Figure 4b — SD31 with a Universal Process Output installed for output 1 (S D 3 1 - _ F _ _ - _ _ _ _).

9 10

Series SD31 — Wiring Connectors

NOTE: The SD31 model number determines which connector diagram applies to your unit.

Screw clamp connnector

Spring clamp connnector

30.7 mm (1.21 in)

53.6 mm (2.11 in)

SET

45.0 to 45.6 mm (1.77 to 1.79 in)

Panel Cutout

Panel Thickness

1.5 to 9.5 mm

(0.060 to 0.375 in)

22.2 to 22.5 mm (0.87 to 0.89 in)

12.7 mm (0.50 in)

minimum

12.7 mm (0.50 in) minimum

234

47.2 mm (1.86 in)

29.3 mm (1.15 in)

8 9

10 11

Watlow Series SD31 ■ 5 ■ Chapter 2 Install and Wire

Installing the Series SD31 Controller

1. Make the panel cutout using the mounting template dimensions in this chapter.

2. Check that the rubber gasket lies in its slot at the back of the bezel. Insert the controller into the panel cutout.

3. While pressing the bezel firmly against the panel, slide the mounting bracket over the back of the controller.

4. If the installation does not require an IP65/NEMA 4X seal, slide the bracket up to the back of the panel enough to eliminate the spacing between the gasket and the panel.

For an IP65/NEMA 4X seal, use your thumb to lock the tabs into place while pressing the controller from side to side. Don’t be afraid to apply enough pressure to properly install the controller. If you can move the controller back and forth in the cutout, you do not have a proper seal. The tabs on each side of the bracket have teeth that latch into the ridges.

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. Either the two middle tabs or the two tabs diagonal from each other will be engaged.

5. If the matching tabs are not engaged, you do not have an IP65/NEMA 4X seal. The space between the bezel and panel must be 0 to 0.48 mm (0 to 0.019 in) maximum.

Removing the SD31 Controller

1. Remove the terminal cover and all the wiring connectors from the back of the controller.

2. Slide a thin, wide tool (putty knife) under all three mounting tabs on the top and then the bottom, while pushing forward on the back of the case. Be ready to support the controller as it slides out of the panel cutout.

Panel

Mounting Bracket

Mounting Tab

Mounting Ridge

Gasket

Bezel

Case

Arrows indicate the direction of pull to remove the connectors.

IP65/NEMA 4X Seal Example

Watlow Series SD31 ■ 6 ■ Chapter 2 Install and Wire

Warning: Use National Electric (NEC) or other country-specific standard wiring and safety practices when wiring and connecting this controller to a power source and to electrical sensors or peripheral devices. Failure to do so may result in damage to equipment and property, and/or injury or loss of life.

WARNING: If high voltage is applied to a low-voltage controller, irreversible damage will occur.

Wiring the Series SD31

The model number for each output option appears with its wiring diagram. Check the label on the controller and compare your model number to those shown here and to the model number breakdown in the Appendix of this manual.

The connectors on the back of the Series SD31 are different for different model numbers. See page 4. Where two different combinations of connectors may appear, we show both in the diagrams.

All outputs are referenced to a de-energized state.

All wiring and fusing must conform to the National Electric Code and to any locally applicable codes as well.

Figure 6a — High Voltage AC Power Wiring

SD31 - H _ _ _ - _ _ _ _ High

• Nominal voltage: 100 to 240VÅ (ac)

Figure 6b — Low Voltage AC Power Wiring

SD31 - L _ _ _ - _ _ _ _ Low

• Nominal voltage: 24‡ (ac/dc)

• Class 2 power source required for agency compliance

Isolation Blocks

Electrical isolation exists between each of these blocks.

Relay outputs (mechanical and solid-state) provide isolation through their relay contacts. Each relay output is isolated from the blocks above and is isolated from other relay outputs.

Sensor Input

Switched DC Outputs

Analog Process Outputs

Power Supply Input EIA/TIA-485 Communi-

cations Input

1 2

1 2 3

1 2

1 2 3

Note: To prevent ground loops, isolation needs to be maintained from input to output when using switched DC or analog process outputs.

WARNING: Process input may not have sensor break protection. Outputs can remain full on.

Watlow Series SD31 ■ 7 ■ Chapter 2 Install and Wire

Figure 7a — Thermocouple Input

(all model numbers) Thermocouples are polarity sensitive. The negative lead (usually red) must be

connected to terminal 11.

• Input impedance: >20 MΩ

Figure 7b — RTD Input (100

ΩΩ

DIN curve 0.00385 ΩΩ/ΩΩ/°C)

(all model numbers) Terminals 8 and 11 must be shorted for a two-wire RTD. For three-wire RTDs,

the S1 lead (usually white) must be connected to terminal 10.

• Nominal excitation current: 390 µA

Figure 7c — 0 to 10V

ÎÎ

(dc) Process Input

(all model numbers)

• Input impedance 20 kΩ, dc only

Figure 7d — 0 to 50mV

ÎÎ

(dc) Process Input

(all model numbers)

• Input impedance >20 MΩ, dc only

3-wire RTD

2-wire RTD

5 6 7 8 9 10

+10

-11

8 9

10 11

S2 8 S1 10

8 9

10 11

5 6 7 8 9 10

S2 8 S1 10

S3 11

8 9

10 11

9 11

8 9

10 11

5 6 7 8 9 10

8 9

10 11

6 7 8 9 10

Watlow Series SD31 ■ 8 ■ Chapter 2 Install and Wire

Figure 8a — 0 to 20 mA Process Input

(all model numbers)

• Input impedance 100 Ω, dc only

• Controller does not supply power for the current loop

Figure 8b — Output 1 Mechanical Relay

SD31 - _ J _ _ - _ _ _ _

• Form A contact

• 2 A, resistive

• 125 VA pilot duty, 120/240VÅ (ac), inductive

• See Quencharc note

• 240VÅ (ac) maximum

• 30VÎ (dc) maximum

• For use with ac or dc

• Minimum load current 10 mA

• Output does not supply power

Figure 8c — Output 1 Solid-state Relay

SD31 - _ K _ _ - _ _ _ _

• Form A contact

• 0.5 A maximum, resistive

• 20 VA pilot duty, 120/240VÅ (ac), inductive

• See Quencharc note

• 24 to 240VÅ (ac)

• Minimum load current 10 mA

• Maximum leakage current 100 µA

• Not for use with direct current (dc)

• Output does not supply power

WARNING: Process input may not have sensor break protection. Outputs can remain full on.

Quencharc Note: Switching pilot duty inductive loads (relay coils, solenoids, etc.) with the mechanical relay or solid-state relay output options requires use of an R.C. suppressor.

Watlow carries the R.C. suppressor Quencharc brand name, which is a trademark of ITW Paktron. Watlow Part No. 08040147-0000.

8 9

10 11

6 7 8 9 10

common 5

normally open 6

COM.

N.O.

Mechanical Relay

Internal Circuitry

common 5

normally open 6

Solid-state Relay Solid-state Switch

COM.

N.O.

Internal Circuitry

5 6

Transmitter

Power Supply

Two Wire Transmitter Wiring

7 8

9 10

Watlow Series SD31 ■ 9 ■ Chapter 2 Install and Wire

Figure 9a — Output 1 Switched DC

SD31 - _ C _ _ - _ _ _ _

• Supply current 30 mAÎ (dc) maximum

• Supply voltage 6 to 12VÎ (dc)

• Not recommended for switching mechanical relays

• Output supplies power

Figure 9b — Output 1 Process

SD31 - _ F _ _ - _ _ _ _

• Analog output is scalable between 0 to 10VÎ (dc) or 0 to 20 mAÎ (dc)

• Load capability: voltage 1 kΩ minimum; current 800 Ω maximum

• Output supplies power

• Cannot use voltage and current output at the same time

Figure 9c — Output 2 Mechanical Relay

SD31 - _ _ J _ - _ _ _ _

• Form A contact

• 2 A, resistive

• 125 VA pilot duty, 120/240VÅ (ac), inductive

• See Quencharc note

• 240VÅ (ac) maximum

• 30VÎ (dc) maximum

• For use with ac or dc

• Minimum load current 10 mA

• Output does not supply power

Note: To prevent ground loops, isolation needs to be maintained from input to output when using switched DC or analog process outputs.

Quencharc Note: Switching pilot duty inductive loads (relay coils, solenoids, etc.) with the mechanical relay or solid-state relay output options requires use of an R.C. suppressor.

Watlow carries the R.C. suppressor Quencharc brand name, which is a trademark of ITW Paktron. Watlow Part No. 08040147-0000.

dc+

dc-

4 56

Load

Switched DC

dc+

dc-

Internal Circuitry

amps+ 5

volts+ 6

com- 7

5 6 7 8

Mechanical Relay

COM.

common

normally open

2 3 4

N.O.

Internal Circuitry

Quencharc Note: Switching pilot duty inductive loads (relay coils, solenoids, etc.) with the mechanical relay or solid-state relay output options requires use of an R.C. suppressor.

Watlow carries the R.C. suppressor Quencharc brand name, which is a trademark of ITW Paktron. Watlow Part No. 08040147-0000.

Note: To prevent ground loops, isolation needs to be maintained from input to output when using switched DC or analog process outputs.

Figure 10a — Output 2 Solid-state Relay

SD31 - _ _ K _ - _ _ _ _

• Form A contact

• 0.5 A maximum, resistive

• 20 VA pilot duty, 120/240VÅ (ac), inductive

• See Quencharc note

• 24 to 240VÅ (ac)

• Minimum load current 10 mA

• Maximum leakage current 100 µA

• Not for use with direct current (dc)

• Output does not supply power

Figure 10b — Output 2 Switched DC

SD31 - _ _ C _ - _ _ _ _

• Maximum supply current 30 mAÎ (dc)

• Supply voltage 6 to 12VÎ (dc)

• Not recommended for switching mechanical relays

• Output supplies power

Figure 10c — Output 2 EIA/TIA-485

SD31 - _ _ U _ - _ _ _ _

• Isolated [50 VÎ (dc)]

• Half duplex

• For more communications information, see the Features chapter

Watlow Series SD31 ■ 10 ■ Chapter 2 Install and Wire

Solid-state Relay

Solid-state Switch

COM.

N.O.

Internal Circuitry

common

normally open

2 3 4

dc+ 3

dc- 4

2 3 4

Load

Switched DC

dc+

dc-

Internal Circuitry

T+/R+ 3

T-/R- 4

3 4

Watlow Series SD31 ■ 11 ■ Chapter 2 Install and Wire

When choosing an EIA/TIA 232 to 485 converter, look for one with the following features:

Two-wire capability

EIA/TIA-485 can be implemented as a two-wire system or a four-wire system. Most Watlow controllers, including the Series SD31, use two-wire communications when working with EIA/TIA-485. The converter selected must have a two-wire mode. Some converters can only be used in a four-wire mode.

Automatic Send Data control

In a two-wire system, both the transmitted signals and the received signals travel over the same pair of wires, so the converter must have a method of changing from the transmit mode to the receive mode. Some converters require the toggling of a control line (usually the RTS line) to perform this transition, while others use an automatic timing circuit. The toggling method is dependent on the PC software to toggle the control line and the PC’s operating system to make that transition happen in a timely manner. Because of these dependencies, the best choice for a converter is one with automatic control.

Isolation

Converters are available with or without input-tooutput isolation. An isolated converter is not a requirement when used with the Series SD31, but it is recommended to avoid ground loops. Isolation could be a consideration when the Series SD31 will be used on a network with other devices that may require isolation.

Power Supply

Many converters can be powered up either through the signals of a serial port or through an external power supply. Because some computers, such as laptops, do not always provide enough power to supply the converter, we recommend using an external power supply with specifications as recommended by the converter manufacturer. Isolated converters may require two supplies.

Biasing and termination

If the system does not work properly, it may need termination resistors at each end of the network. A typical installation would require a 120-ohm resistor across the transmit/receive terminals (3 and 4) of the last controller in the network and the converter box. Pull-up and pull-down resistors may be needed at the converter to maintain the correct voltage during the idle state. The pull-up resistor is connected between the positive of the DC supply and the T+/R+ terminal. The pull-down resistor is connected between the negative of the DC supply and the T-/Rterminal.

Selecting an EIA/TIA-232 to EIA/TIA-485 Converter

Figure 11a — B&B Converters Non-Isolated Converter - 485SD9TB B&B Electronics Manufacturing Company, (815) 433-5100, http://www.bb-elec.com/

Figure 11b — B&B Converters Isolated Converter - 4850I9TB B&B Electronics Manufacturing Company, (815) 433-5100, http://www.bb-elec.com/

Figure 11c — Wiring bias and termination resistors. Controllers must be wired in a daisy chain configuration. Add a 120ΩΩtermination resistor on the last controller.

RS-232

Power Supply

EIA/TIA 485

Converter

485SD9TB

Watlow p/n 0830-0473-0001

6 ft. comms cable Watlow p/n 0830-0473-0003

485OI9TB

GND

RS-485

GND

12VÎ (dc)

Watlow p/n 0830-0473-0002

TD(A) TD(B) RD(A) RD(B) GND +12VDC

Watlow p/n 0830-0473-0002Watlow p/n 0803-0473-0005

T+/R+

T-/R-

GND

TD (B)

TD (A)

T-/RT+/R+

Power

–

Supply

T-/RT+/R+

12 Volt Power Supply

SD SD

120VÅ (ac)

4 3

120V (ac)

4 3

Watlow Series SD31 ■ 12 ■ Chapter 2 Install and Wire

Ethernet Gateway

The EM00-GATE-0000 is a bridge that allows up to 32 Watlow controllers to be directly connected to an Ethernet network.

The gateway provides a bridge for Modbus messages between the Ethernet bus and EIA-485 or EIA-232 links. The Gateway supports full product configuration monitoring and configuration of runtime parameters via MODBUS TCP over TCP/IP using a software package such as Watlow’s WATVIEW™.

The Series SD31 can be configured using WATVIEW with or without the EM Gateway.

For more information, go to www.watlow.com and search on EM Gateway.

Figure 12a — Connecting to the Watlow EM Gateway (Ethernet to EIA/TIA 485 Serial Modbus connection). Controllers must be wired in a daisy chain configuration.

Note: UL Approved, Class 2, power supply required as EM Gateway power source: 24VÎ (dc), part 0830-0474-000.

T+/R+

T-/R-

Ethernet RJ45

24Võ (ac/dc)

Watlow Series SD31 ■ 13 ■ Chapter 2 Install and Wire

Notes:

Watlow Series SD31 ■ 14 ■ Chapter 3 Keys and Displays

Keys and Displays

Note: After 60 seconds with no key presses, the controller reverts to the Home Page.

Four Digit, LED Display:

• Indicates process value or set point information

• Page name, prompt name or prompt value, depending upon the key combination pressed.

Timer Indication (timer option only)

Colon indicates status of timer.

Active Output Indicator Lights

Lit when the corresponding controller output or alarm is on.

Ready Status Indicator Light (timer option only)

Lit when the corresponding controller output is on.

Auto-Manual Control Indicator Light

On: Manual Mode (openloop control)

Off: Auto Mode (closedloop control)

Set Key

Press to view set point, process or parameter values, depending on [~dsp} setting. Release ß Key to view page or parameter information.

Infinity Key

Returns to the Home Page.

Press and hold the Infinity Key ˆ for about 2 seconds to enter the Operations Page.

Clears latching alarms.

Up and Down Keys

On the Home Page, adjusts the set point (you may need to press and hold the ß Key depending on [~dsp} setting).

On other pages, selects parameters, or allows changing parameter values when ß Key is pressed.

SET

SDXX

2 RDY %

Watlow Series SD31 ■ 15 ■ Chapter 3 Keys and Displays

Home Page Overview

The Home Page is the default display of the Series SD31 controller. The Home Page can be configured to display either the process value or set point value. (see the {~Dsp} prompt on the Setup Page.) This parameter determines what parameters and values are displayed.

Automatic Mode

The % indicator light is off.

Manual Mode

The % indicator light is on.

Error condition

The % indicator light is on. If the controller was in Auto mode it will switch to Manual mode when it detects an input error.

Alarm Message

During Ramping

The display alternates between the current set point achieved in the ramp, the actual process value and the target set point. The prompt appears in the display first and then the value for that prompt.

To change the target set point value, press and hold the ß Key and adjust the set point value using the UP ¿ or DOWN ¯Keys.

Once the current set point reaches the target set point value, the ramp is complete and the display stops alternating.

* Appears if [~dsp] = [~pro]. If [~dsp] = [~set], press the

ß Key to view this parameter.

** Appears if [~dsp] = [~pro]. If [~dsp] = [~set], you do not need to press the

ß Key to view this parameter.

Note: See Timer chapter for additional displays available with the timer option.

**Current set point prompt

**Current set point value

*Current process prompt

*Current process value

**Target set point prompt

**Target set point value

[``rP]->[``75]->[proc]->[`~72]->[rP;tg]->[`100]

* [A1;Lo]->[``75] Actual temperature

**Press ß Key [A1;Lo]->[``80] Set point value

Alarm message alternates with set point or process value (auto mode) or power setting (manual mode).

The corresponding output indicator light is on.

* [Er;In] Error message **Press ß Key [``0;0] Output power setting (Use Up

¿ or Down ¯ keys to raise or lower the set point.)

* [``75] Actual temperature **Press ß Key [``0;0] Output power setting (Use Up

¿ or Down ¯ keys to raise or lower the set point.)

* [``75] Actual temperature

**Press ß Key [``75] Set point value

(Use Up ¿ or Down ¯ keys to raise or lower the set point.)

Adjusting the control set point

The controller must be in automatic mode. Adjust the

control set point on the Home Page. It is not necessary to enter any other page. With [~dsp] = [~pro] (on Setup Page), the process temperature appears in the display. Press and hold the ß Key to display the control set point.

To adjust the set point:

1. Ensure the controller is in the automatic mode and that you are on the Home Page. If you are on any other page, press the Infinity Key ˆ.

2. The process temperature is displayed in the display window. Press and hold the ß Key, and use the Up Key ¿ to increase the set point or press the Down Key ¯ to decrease the set point value.

3. The controller will automatically begin using the new set point after three seconds. or press the Infinity Key ˆ to immediately use the new value.

With [~dsp] = [~set] (on Setup Page), the control set

point appears in the display, if the controller is in the automatic mode.

To adjust the set point:

1. Ensure the controller is in the automatic mode and that you are on the Home Page. If you are on any other page, press the Infinity Key ˆ.

2. The temperature set point is displayed in the display window. Press the Up Key ¿ to increase the temperature. Press the Down Key ¯ to decrease the temperature.

3. The controller will automatically begin using the new set point after three seconds. or press the Infinity Key ˆ to immediately use the new value.

Note: The [`lOC] parameter can lock the ability to adjust the set point. If you are unable to adjust the set point, check [`lOC] setting on the Setup Page.

Note: To stop the Series SD31 controller from controlling to a set point, press and hold the

ßKey and press the DOWN ¯Key until

the set point value displays [`OFF]. A set point value of one less than the SP Low value turns the control outputs off and the controller will no longer attempt to maintain a set point.

Caution: The controller is in the manual mode when the percent LED % is lit. If the controller is in the manual mode, the manual output power value is displayed in place of the automatic mode control set point. Setting this value can force an output to stay on regardless of the temperature reading. Always ensure you are in the automatic mode when adjusting the temperature set point value.

Watlow Series SD31 ■ 16 ■ Chapter 3 Keys and Displays

Operations Page Overview

The Operations Page contains parameters accessed during normal day-to-day operation. The Series SD31 provides a patented user-definable menu system, allowing the user to customize the Operations Page contents.

To go to the Operations Page, press and hold the Infinity Key ˆ for about three seconds from the Home Page.

• Press the Down ¯ or Up ¿ keys to move through the

Operations Page parameters.

• To view or change a parameter value, press and hold

the ß Key.

• Press the Down ¯ or Up ¿ keys to change the parame-

ter value.

• Press the Infinity Key ˆ at any time to return to the

Home Page.

Operations Page

With Timer Option / Without Timer Option (typical de-

faults)

Note: Hardware configuration and programming selections determine what parameters appear on the Operations Page. A maximum of 20 parameters can be defined on the Operations Page.

[hour] Countdown Timer Hours / [Po;ht] Power Heat [Min] Countdown Timer Minutes / [A-m] Auto-Manual [~Sec] Countdown Timer Seconds / [~Aut] Autotune [~rdy] Ready Band / [~CAL] Calibration Offset [Ct;SP] Closed Loop Timer Set Point / [ht;m] Heat Con-

trol Method

[Po;ht] Power Heat / [Pb;ht] Proportional Band Heat [~Aut] Autotune / [re;ht] Reset Heat [~CAL] Calibration Offset / [ra;ht] Rate Heat [ht;m] Heat Control Method / [h;hyS] Heat Hysteresis [Pb;ht] Proportional Band Heat / [CL;M] Cool Control

Method

[re;ht] Reset Heat / [Pb;CL] Proportional Band Cool [ra;ht] Rate Heat / [rE;CL] Reset Cool [CL;M] Cool Control Method / [rA;CL] Rate Cool [Pb;CL] Proportional Band Cool / [C;hyS] Cool Hysteresis [rE;CL] Reset Cool / [A1;hi] Alarm 1 High [rA;CL] Rate Cool / [A1;Lo] Alarm 1 Low [A1;hi] Alarm 1 High / [A2;hi] Alarm 2 High [A1;Lo] Alarm 1 Low / A2;Lo] Alarm 2 Low [A2;hi] Alarm 2 High / [none] No selection [A2;Lo] Alarm 2 Low / [none] No selection

[Oper]

Watlow Series SD31 ■ 17 ■ Chapter 3 Keys and Displays

[Ot`1] Output 1 Function [Ctr1] Control Method 1 [Ftb1] Fixed Time Base 1 [PL`1] Power Limit 1 [PSL1] Output Power Scale Low 1 [PSh1] Output Power Scale High 1 [nLF1] Output Non-linear Function 1 [AO1;U] Analog Output 1 Units [O1;Lo] Analog Output 1 Scale Low [O1;hi] Analog Output 1 Scale High [r1;So] Output 1 Retransmit Source [r1;Lo] Output 1 Retransmit Low Scale [r1;Hi] Output 1 Retransmit High Scale [r1;CO] Output 1 Retransmit Offset [ti;F1] Output Timer Function 1 [S;M1] Signal Time Minutes 1 [`S;S1] Signal Time Seconds 1 [Ot`2] Output 2 Function [Ctr2] Control Method 2 [Ftb2] Fixed Time Base 2 [PL`2] Power Limit 2 [PSL2] Output Power Scale Low 2 [PSh2] Output Power Scale High 2 [nLF2] Output Non-linear Function 2 [ti;F2] Output Timer Function 2 [S;M2] Signal Time Minutes 2 [`S;S2] Signal Time Seconds 2 [hyS1] Alarm 1 Hysteresis [Lgc1] Alarm 1 Logic [LAt1] Alarm 1 Latching [SiL1] Alarm 1 Silencing [dSP1] Alarm 1 Message [hyS2] Alarm 2 Hysteresis [Lgc2] Alarm 2 Logic [LAt2] Alarm 2 Latching [SiL2] Alarm 2 Silencing [dSP2] Alarm 2 Message [ACLF] AC Line Frequency [Unit] Units of Measurement [I;Err] Input Error Latching [FAIL] Input Error Failure Mode [MAn] Input Error Power [`dSP] Active Displays [``rP] Ramp to Set Point Mode [rP;Sc] Ramp Scale [rP;rt] Ramp Rate Addr] Modbus Device Address [bAud] Baud Rate [`LOC] Lockout

Setup Page Overview

The Setup Page contains parameters that define basic controller functions. Go to the Setup Page for initial configuration or if your application requirements change. Be sure to program the Setup Page first!

Always press the Infinity Key ˆ to return to the Home Page.

You must start from the Home Page. To go to the Setup Page, press both the Up ¿ and

Down ¯ keys for about three seconds.

• Press the Down ¯ or Up ¿ keys to move

through the Setup Page parameters.

• To view a parameter value, press and hold

the ß Key.

• To change a parameter value, press and hold

the ß Key and use the Down ¯ or Up ¿ keys to change the parameter value.

• Press the Infinity Key ˆ at any time to re-

turn to the Home Page.

[`SEt]

Setup Page

[`Sen] Sensor Type [`Lin] Linearization [`C-F] Temperature Units [S;deC] Temperature Decimal Places [P;dEC] Process Decimal Places [IS;En] InfoSense Enable [IS;P1] InfoSense Point 1 [IS;P2] InfoSense Point 2 [IS;P3] InfoSense Point 3 [IS;P4] InfoSense Point 4 [Sc;Lo] Process Scale Low [Sc;hi] Process Scale High [P1;LE] Process Input Low Error [P1;HE] Process Input High Error [rg;Lo] Units Scale Low [rg;hi] Units Scale High [SP;Lo] Set Point Low Limit [SP;hi] Set Point High Limit [Ftr;E] Enable Input Filter [FLtr] Filter Value [ti;En] Timer Enable [hour] Countdown Time Hours [Min] Countdown Time Minutes [`Sec] Countdown Time Seconds [ti;St] Timer Start Method [ti;SP] Timer Set Point [`rdy] Ready Band [rdy;L] Ready Light Enable

Note: Hardware configuration and programming selections determine what parameters appear on the Setup Page.

Watlow Series SD31 ■ 18 ■ Chapter 3 Keys and Displays

Factory Page

[AMb] Ambient Temperature [A;mn] Minimum Recorded Ambient Temperature [A;ma] Maximum Recorded Ambient Temperature [DSPL] Display Intensity [A;Ot1] Output 1 Process Value [rESt] Restore Factory Calibration [Usr;r] Restore User Settings [USr;S] Save User Settings [dFLt] Default Parameters [O;ty1] Output 1 Type [O;ty2] Output 2 Type [`S;Id] Software ID [S;UEr] Software Version [S;bld] Software Build Number [PWr] Power Type [`Sn-] Serial Number 1 (first four digits) [`Sn_] Serial Number 2 (last four digits) [tc;50] Thermocouple, 50mV [tc;00] Thermocouple, 0mV [tc;32] Thermocouple, 32°F [`r;15] RTD, 15 ohm [r;380] RTD, 380 ohm [``U;1] Input Calibrate, 1.0 Volt [``U;9] Input Calibrate, 9.0 Volt [``A;4] Input Calibrate, 4.0 mA [`A;16] Input Calibrate, 16.0 mA [O1;1u] Output 1 Calibrate, 1.0 Volt [O1;9u] Output 1 Calibrate, 9.0 Volt [O1;4A] Output 1 Calibrate, 4.0 mA [O1;16] Output 1 Calibrate, 16.0 mA

Factory Page Overview

The Factory Page contains information on diagnostics, calibration and restore-parameter functions.

To go to the Factory Page, press both the Up ¿ and Down ¯ keys for about six seconds from the Home Page.

• Press the Down ¯ or Up ¿ keys to move through the Factory Page parameters.

• To view a parameter value, press and hold the ß Key.

• To change a parameter value, press and hold the ß Key and use the Down ¯ or Up ¿ keys to change the parameter value.

• Press the Infinity Key ˆ at any time to return to the Home Page.

Note: Hardware configuration and programming selections determine what parameters appear on the Factory Page.

[FAct]

Programming Page Overview

The Programming Page determines what parameters the user wants to appear on the Operations Page. Select a parameter for any of the 20 Programming Page locations, P1 to P20. These now appear on the Operations Page. All 20 locations have parameters selected as defaults.

To go to the Programming Page, hold down the Infinity key ˆ, then press the SET Key ß, and hold both down for about six seconds.

• Press the Down ¯ or Up ¿ keys to move through

the Programming Page parameters, P1-P20.

• To view a parameter value, press and hold the

ß Key.

• To change a parameter value, press and hold the

ß Key and use the Down ¯ or Up ¿ keys to change the parameter value.

• Press the Infinity Key ˆ at any time to return to

the Home Page.

Note: The hardware configuration and programming selections will also determine what parameters appear on the Operations Page. A Programming Page selection will not appear on the Operations Page if the parameter is not active.

[Prog]

Programming Page

[~~P1] Parameter Location 1 (48)* [~~P2] Parameter Location 2 (49) [~~P3] Parameter Location 3 (50) [~~P4] Parameter Location 4 (51) [~~P5] Parameter Location 5 (52) [~~P6 Parameter Location 6 (53) [~~P7] Parameter Location 7 (54) [~~P8] Parameter Location 8 (55) [~~P9] Parameter Location 9 (56) [~P10] Parameter Location 10 (57) [~P11] Parameter Location 11 (58) [~P12] Parameter Location 12 (59) [~P13] Parameter Location 13 (60) [~P14] Parameter Location 14 (61) [~P15] Parameter Location 15 (62) [~P16] Parameter Location 16 (63) [~P17] Parameter Location 17 (64) [~P18] Parameter Location 18 (65) [~P19] Parameter Location 19 (66) [~P20] Parameter Location 20 (67)

*Programming Page parameters P1 through P20 are Modbus register numbers 48 through 67

Watlow Series SD31 ■ 19 ■ Chapter 4 Home

Display Parameter Name

Description

Settings Range

(Integer values for Modbus

in parenthesis.)

Default Modbus*

(less 40,001

offset)

Read/Write

Appears if:

Note: Some values will be rounded off to fit in the four-character display. Full values can be read with Modbus.

* Low register numbers contain the two higher bytes; high register numbers contain the two lower bytes of the four-byte integer. Decimal precision is implied at three decimal places unless otherwise noted.

Caution: Writing to registers continuously, such as ramping set points via comms, will damage the SD31 EEPROM memory. See page 59.

Note: The [~dsp] setting on the Setup Page, determines if Process or Set Point is normally displayed and the action of the

ß Key.

Home Page

Measured Value

Process Value

Displays the current process value.

-1999 to 9999 degrees or units (-1999000 to 9999000)

*20, 21 R

There is no input error and [Ftr;E] is set to [`Off] or [Cont].

Set Value Closed Loop Set Point

Show the current closed loop control set point.

Set Point Low Limit

[SP;Lo]

to Set Point High

Limit

[SP;hi]

[`Off] Stop controlling to

SP (-200000001)

*27, 28 R/W

Control mode is [auto] and there is no input error.

Measured Value

Filtered Process Value

Displays the current filtered process value.

-1999 to 9999 degrees or units (-1999000 to 9999000)

*22, 23 R

There is no input error and [Ftr;E] is set to [Disp] or [both].

Set Value Open Loop Output Power

Show the current open loop (manual) control set point. The % indicator light is on when the controller is in open loop (manual control).

-100.0 to 0.0% if any output is set to cool; 0.0 to 100.0% if any output is set to heat (-10000 to 0000, 0000 to

10000. Two decimal places implied for Modbus.)

0.0%

26 R/W

Control mode is [Man]. If there is no input error and [Ftr;E] is set to [`Off] or

[Cont].

[``rP]

Current Ramp Set Point

The current working control set point for the ramp that is in process appears in the display after this prompt appears.

-1999 to 9999 (-1999000 to 9999000)

*254 255 R

Controller is ramping.

[Proc]

Process Value

Displays the current process value.

-1999 to 9999 degrees or units (-1999000 to 9999000)

*20, 21 R

If there is no input error, ramping set point is active and [~dsp] is set to [~Pro].

[hour]

Countdown Time - Hours

Displays the number of hours remaining for the countdown time.

0 to 99 hours (0 to 99000)

375 R

Timer model only, SD31-XXXX-XTXX.

[`Ot1]

[`Ot2

]is set

[tim]

[Min]

Countdown Time - Minutes

Set the number of minutes remaining for the countdown time.

0 to 59 minutes (0 to 59000)

376 R

Timer model only, SD31-XXXX-XTXX.

[`Ot1]

[`Ot2

]is set

[tim]

[`Sec]

Countdown Time - Seconds

Set the number of seconds remaining for the countdown time.

0 to 59 seconds (0 to 59000)

377 R

Timer model only, SD31-XXXX-XTXX.

[`Ot1]

[`Ot2

]is set

[tim]

Press the Infinity Key ˆ at any time to go to the Home Page. Depending upon the controller’s status, you will see some combination of the parameters listed below. Normally,

you will see the Process Value in the display. See Home Page Overview in Chapter Three. After 60 seconds with no key presses, the controller reverts to the Home Page.

Watlow Series SD31 ■ 20 ■ Chapter 4 Home

Note: Some values will be rounded off to fit in the four-character display. Full values can be read with Modbus.

* Low numbers contain the two lower bytes; high numbers contain the two higher bytes of the four-byte integer. Decimal precision is set in another parameter.

Caution: Writing to registers continuously, such as ramping set points via comms, will damage the SD31 EEPROM memory. See page 59.

[rP;tg]

Ramp Target Set Point

The target set point for the ramp that is in process appears in the display after this prompt appears.

Set Point Low Limit

[SP;Lo]

to Set Point High

Limit

[SP;hi]

Same as Closed Loop Set Point

Controller is ramping.

[Er;In]

Input Error

Indicate an input error state.

None (0)

[----]

Error (1)

24 R

There is an analog input error.

[A1;Lo]

Alarm Low 1 Status

Indicate a low alarm at output 1.

None (0) Alarm (1)

29 R

There is an Alarm 1 low side alarm.

[A1;hi]

Alarm High 1 Status

Indicate a high alarm at output 1.

None (0) Alarm (1)

30 R

There is an Alarm 1 high side alarm.

[A2;Lo]

Alarm Low 2 Status

Indicate a low alarm at output 2.

None (0) Alarm (1)

31 R

There is an Alarm 2 low side alarm.

[A2;hi]

Alarm High 2 Status

Indicate a high alarm at output 2.

None (0) Alarm (1)

32 R

There is an Alarm 2 high side alarm.

Display Parameter Name

Description

Settings Range

(Integer values for Modbus

in parenthesis.)

Default Modbus*

(less 40,001

offset)

Read/Write

Appears if:

Watlow Series SD31 ■ 21 ■ Chapter 5 Setup

Note: Some values will be rounded off to fit in the four-character display. Full values can be read with Modbus.

Caution: Writing to registers continuously, such as ramping set points via comms, will damage the SD31 EEPROM memory. See page 59.

Display Parameter Name

Description

Settings Range

(Integer values for Modbus

in parentheses.)

Default Modbus*

(less 40,001

offset)

Read/Write

Appears if:

Setup Page

[`Sen]

[ SEn]

Sensor Type

Set the analog sensor type.

[``tc]

thermocouple (0)

[`rtd]

RTD (1)

[`MA]

milliam,ps (2)

[uolt]

volts (3)

[``tc]

(0)

70 R/W

Always active.

[`Lin]

[ Lin]

Thermocouple Linearization

Set the analog input thermocouple linearization.

[```J]

J (0)

[```D]

D (6)

[```H]

K (1)

[Pt11]

PTII (7)

[```t]

T (2)

[```R]

R (8)

[```E]

E (3)

[```S]

S (9)

[```n]

N (4)

[```B]

B (10)

[```C]

C (5)

[```J]

(0)

71 R/W

[`Sen]

is set to [``tc].

[`C-F]

[ C-F]

Temperature Units

Set the temperature units for thermocouple and RTD inputs.

[```F]

Fahrenheit (0)

[```C]

Celsius (1)

[```F]

(0)

40 R/W

[`Sen]

is set to [``tc]

or [`rtd].

[S;deC]

[S.dEC]

Temperature Decimal Places

Set the decimal places for the displayed input value for thermocouple and RTD types.

[```0]

(0)

[``0;0]

(1)

[```0]

(0)

41 R/W

[`Sen]

is set to [``tc]

or [`rtd].

[P;dEC]

[P.dEC]

Process Decimal Places

Set the decimal places for the displayed input value for process types.

[```0]

(0)

[``0;0]

(1)

[`0;00]

(2)

[0;000]

(3)

[```0]

(0)

42 R/W

[`Sen]

is set to

[`mA]

[uoLt]

[IS;En]

[IS.En]

INFOSENSE

Enable the sensor feature, which synchronizes the controller with a Watlow sensor.

[``no]

no (0)

[`Yes]

yes (1)

[``no]

(0)

91 R/W

Always active.

[IS;P1]

[IS.P1]

INFOSENSETM1

Set sensor point 1 code.

0 to 999

(0 to 999)

500

92 R/W

[IS;En]

is set to

[`yes]

[IS;P2]

[IS.P2]

INFOSENSETM2

Set sensor point 2 code.

0 to 999

(0 to 999)

500

93 R/W

[IS;En]

is set to

[`yes]

[IS;P3]

[IS.P3]

INFOSENSETM3

Set sensor point 3 code.

0 to 999

(0 to 999)

500

94 R/W

[IS;En]

is set to

[`yes]

[IS;P4]

[IS.P4]

INFOSENSETM4

Set sensor point 4 code.

0 to 999

(0 to 999)

500

95 R/W

[IS;En]

is set to

[`yes]

To go to the Setup Page, press both the Down ¯ and Up ¿ keys for three seconds from the Home Page.

[`SEt]

will appear in the display.

• Press the Down ¯ or Up ¿ keys to move through the Setup Page parameters.

• To view or change a parameter value, press and hold the ß Key.

• Press the Down ¯ or Up ¿ keys to change the parameter value.

• Press the Infinity Key ˆ at any time to return to the Home Page.

Watlow Series SD31 ■ 22 ■ Chapter 5 Setup

Display Parameter Name

Description

Settings Range

(Integer values for Modbus

in parentheses.)

Default Modbus*

(less 40,001

offset)

Read/Write

Appears if:

Note: Some values will be rounded off to fit in the four-character display. Full values can be read with Modbus.

Caution: Writing to registers continuously, such as ramping set points via comms, will damage the SD31 EEPROM memory. See page 59.

[Sc;Lo]

[Sc.Lo]

Process Scale Low

Set the low scale for process inputs.

0.00 to 20.00 mA: if

[`Sen]

is set to

[`mA]

(0000 to 20000)

0.00 to 10.00V: if

[`Sen]

set to

[uoLt]

(0000 to 10000)

4.00 mA

0.00V

*73, 74 R/W (mA) *77, 78 R/W (V)

[`Sen]

is set to

[`mA]

[uolt[.

[Sc;hi]

[Sc.hi]

Process Scale High

Set the high scale for process inputs.

0.00 to 20.00 mA: if

[`Sen]

is set to

[`mA]

(0000 to 20000)

0.00 to 10.00V: if

[`Sen]

set to

[uoLt]

(0000 to 10000)

20.00 mA

5.00V

*75, 76 R/W (mA) *79, 80 R/W (V)

[`Sen]

is set to

[`mA]

[uolt]

[rg;Lo]

[rg.Lo]

Units Scale Low

Set the low range for process input units.

-1999 to 9999 (-1999000 to 9999000)

(Set precision with

[P;dEC]

Process Decimal Places.)

-1999

*81, 82 R/W

[`Sen]

is set to

[`mA]

[uolt]

[rg;hi]

[rg.hi]

Units Scale High

Set the high range for process input units.

-1999 to 9999 (-1999000 to 9999000)

(Set precision with

[P;dEC]

Process Decimal Places.)

9999

*83, 84 R/W

[`Sen]

is set to

[`mA]

[uolt]

[SP;Lo]

[SP.Lo]

Set Point Low Limit

Set the low range for the set point.

Min. operating range (of sensor) to

[SP;Hi]

-0.100: if

{`sen}

is set to

{``tc}

-328 to

[SP;hi]

-0.100: if

{`sen] is set to {`rtd}

-1999 to

[SP;hi]

-0.001: if

{``sen}

is set to

[`MA]

[uolt]

(Set precision with

[P;dEC]

Process Decimal Places.)

Min. operating range (J type):

{``tc}

-328:

{`rtd}

-999:

[`MA]

and

[uolt].

*240, 241 R/W (thermocouple)

*244, 245 R/W (RTD)

*248, 249 R/W (mA or V)

Always active.

[sP;hi]

[SP.hi]

Set Point High Limit

Set the high range for the set point.

[rg;Lo]

to max. operating

range (of sensor): if

{`sen}

is set to

{``tc}

[SP;Lo]

+0.100 to 1472: if

{`sen}

is set to

{`rtd}

[SP;Lo]

+0.001 to 9999: if

{`sen}

is set to

[`MA]

[uolt]

(Set precision with

[P;dEC]

Process Decimal Places)

Max. operating range (J type):

{``tc}

1472:

{`rtd]

999:

[`MA]

and

[uolt]

*242, 243 R/W (thermocouple)

*246, 247 R/W (RTD)

*250, 251 R/W (mA or V)

Always active.

[Ftr;E]

[Ftr.E]

Input Filter

Select filtering action.

[`OFF]

no filtering (0)

[DiSP]

filter only the dis-

play value (1)

[Cont]

filter the

control input values (2)

[both]

(3) filter the display

and control input values

[`OFF] (0)

89 R/W

Always active.

[FLtr]

Filter Value

Set the input filter value.

0.0 to 60.0 seconds (0000 to 60000)

0.0

*87, 88 R/W

[Ftr;E] is not set to [`OFF]

Watlow Series SD31 ■ 23 ■ Chapter 5 Setup

Display Parameter Name

Description

Settings Range

(Integer values for Modbus

in parentheses.)

Default Modbus*

(less 40,001

offset)

Read/Write

Appears if:

Note: Some values will be rounded off to fit in the four-character display. Full values can be read with Modbus.

* Low numbers contain the two lower bytes; high numbers contain the two higher bytes of the four-byte integer. Decimal precision is set in another parameter.

** Timer model only (SD31-XXXX-XTXX)

[ti;En]

[ti.En]

Timer Enable

Set to enable the countdown timer function.

[`~no]

no (0)

[~YEs]

yes (1)

[`~no]

(0)

391 R/W

Timer model only, SD31-XXXX-XTXX.

[`Ot1]

[`Ot2

]is set

[tim]

[hour]

Countdown Time Hours

Set the number of hours for the countdown time.

0-99 hours (0 to 99000)

392 R/W

Timer model only, SD31-XXXX-XTXX.

[`Ot1]

[`Ot2

]is set

[tim]

[Min]

Countdown Time Minutes

Set the number of minutes for the countdown time.

0-59 minutes (0 to 59000)

393 R/W

Timer model only, SD31-XXXX-XTXX.

[`Ot1]

[`Ot2

]is set

[tim]

[`Sec]

[ SEc]

Countdown Time Seconds

Set the number of seconds for the countdown time.

0-59 seconds (0 to 59000)

394 R/W

Timer model only, SD31-XXXX-XTXX.

[`Ot1]

[`Ot2

]is set

[tim]

[ti;St]

[ti.St]

Timer Start Method

Select the method used to start the timer sequence.

[imd]

Immediate (0)

[~rdy]

Ready (1)

[rdy;A]

Ready Acknowledge

(2)

[PWr]

Power Up (3)

[imd]

(0)

399 R/W

Timer model only, SD31-XXXX-XTXX.

[`Ot1]

[`Ot2

]is set

[tim]

[ti;SP]

[ti.SP]

Timer Set Point

Select what set point is used during timing.

[~Off]

Off (0)

[trac]

Track (1)

[PrE;s]

Preset (2)

[trac]

(1)

401 R/W

Timer model only, SD31-XXXX-XTXX.

[`Ot1]

[`Ot2

]is set

[tim]

[`rdy]

[ rdY]

Ready Band

Set the deviation band, in degrees from set point, that would be considered a ready condition.

1-9999 degrees (1000 - 9999000)

10 (10000)

*395, 396 R/W

Timer model only, SD31-XXXX-XTXX.

[ti;St]

is set to

[~rdy]

or [

rdy;A].

[rdy;L]

[rdY.L]

Ready Light Enable

When enabled, the ready light will be lit if the process value is within the ready band.

[`~no]

no (0)

[~YEs]

yes (1)

[`~no]

(0)

400 R/W

Timer model only, SD31-XXXX-XTXX.

[ti;St]

is set to

[~rdy]

or [

rdy;A].

[Ot`1]

[Ot 1]

Output 1 Function

Set Output 1 function.

[`OFF]

Off (0)

[Pr;AL]

Process Alarm (1)

[dE;;AL]

Deviation Alarm (2)

[hEAt]

Heat Control (3)

[CooL]

Cool Control (4)

[rMt]

Retransmit (6)

[tim]

Timer (7)**

[hEAt]

(3)

143 R/W

Always active.

Watlow Series SD31 ■ 24 ■ Chapter 5 Setup

Display Parameter Name

Description

Settings Range

(Integer values for Modbus

in parentheses.)

Default Modbus*

(less 40,001

offset)

Read/Write

Appears if:

Note: Some values will be rounded off to fit in the four-character display. Full values can be read with Modbus.

Caution: Writing to registers continuously, such as ramping set points via comms, will damage the SD31 EEPROM memory. See page 59.

[Ctr1]

Control Method 1

Set output 1 control type. This parameter is only used with PID control, but can be set anytime.

[`Ftb]

Fixed Time Base (0)

[Urtb]

Variable Time Base

(1)

[`Ftb] (0)

144 R/W

[Ot`1]

is set to

[hEAt]

[CooL]

and output

type is

SD _ _ - _ C _ _ - _

_ _ _ or SD _ _ - _ K _ _ _ _ _ _ .

[Ftb1]

Fixed Time Base 1 (Cycle Time)

Set the time base for Fixed Time Base Control.

1.0 to 60.0 seconds if Output 1 is a mechanical relay (1000 to 60000)

0.1 to 60.0 seconds if Output 1 is not a mechanical relay (100 to 60000)

20.0: mech. relay

5.0: solidstate relay

1.0: switched dc

*145, 146 R/W

[Ot`1]

is set to

[hEAt]

[CooL],[Ctr1]

is set

[`Ftb]

and Output 1

is not a process output. (not SD_ _ - _ F _ _ _ _ _ _ )

[PL`1]

[PL 1]

Power Limit 1

Set the maximum power output for a control output

0.0 to 100.0% power (000 to 10000) (Two decimal places implied for Modbus.)

100.0%

160 R/W

[Ot`1]

is set to

[hEAt]

[CooL]

[PsL1]

[PSL1]

Output Power Scale Low 1

Set the low end of the range within which the output will scale.

0.0 to 100.0% (000 to 10000) (Two decimal places implied for Modbus.)

161 R/W

[Ot`1]

is set to

[hEAt]

[CooL],[Ctr1]

is set

[`Ftb]

and Output 1

is not a process output. (not SD_ _ - _ F _ _ _ _ _ _ )

[PSH1]

Output Power Scale High 1

Set the high end of the range within which the output will scale.

0.0 to 100.0% (000 to 10000) (Two decimal places implied for Modbus.)

100%

162 R/W

[Ot`1]

is set to

[hEAt]

[CooL],[Ctr1]

is set

[`Ftb]

and Output 1

is not a process output. (not SD_ _ - _ F _ _ -

_ _ _ _ )

[nLF1]

Output Nonlinear Function 1

Select a nonlinear output curve to match the response of your system.

[`OFF]

off (0)

[Cru1]

curve 1 (1)

[Cru2]

curve 2 (2)

[`OFF]

(0)

163 R/W

[Ot`1]

is set to

[hEAt]

[CooL]

[AO1;U]

[AO1.U]

Analog Output 1 Units

Set the analog output units.

[`mA]

milliamperes (0)

[uolt]

volts (1)

[`mA]

(0)

147 R/W

Output 1 is a process output. (SD_ _ - _ F _ _ - _ _ _ _ )

[O1;Lo]

[O1.Lo]

Analog Output 1 Scale Low

Set the low scale for the process output.

0.00 to 20.00 mA if output is set to mA (0000 to 20000)

0.00 to 10.00V if output is set to volts (0000 to 10000)

4.00 mA

0.00V

*148, 149 R/W (mA)

*152, 153 R/W (V)

Output 1 is a process output. (SD_ _ - _ F _ _ - _ _ _ _ )

[O1;hi]

[O1.hi]

Analog Output 1 Scale High

Set the high scale for the process output.

0.00 to 20.00 mA if output is set to mA (0000 to 20000)

0.00 to 10.00V if output is set to volts (0000 to 10000)

20.00 mA

10.00V

*150, 151 R/W (mA)

*154, 155 R/W (V)

Output 1 is a process output. (SD_ _ - _ F _ _ - _ _ _ _ )

[r1;So]

[r1.So]

Output 1 Retransmit Source

Set the control variable that the retransmit signal represents.

[Proc]

Process Value (0)

[~~SP]

Set Point (1)

[Proc]

(0)

305 R/W

Output 1 is a process output

(SD_ _ - _ _ _ F - _

_ _ _ ) and

[Ot`1]

is set

[rmt]

[r1;lo]

[r1.Lo]

Output 1 Retransmit Low Scale

Set the low scale for the retransmit output.

-1999.0 to 9999.0 (-1999000 to 9999000)

*306, 307 R/W

Output 1 is a process output

(SD_ _ - _ _ _ F - _

_ _ _ ) and

[Ot`1]

is set

[rmt]

Watlow Series SD31 ■ 25 ■ Chapter 5 Setup

Display Parameter Name

Description

Settings Range

(Integer values for Modbus

in parentheses.)

Default Modbus*

(less 40,001

offset)

Read/Write

Appears if:

Note: Some values will be rounded off to fit in the four-character display. Full values can be read with Modbus.

* Low numbers contain the two lower bytes; high numbers contain the two higher bytes of the four-byte integer. Decimal precision is set in another parameter.

** Timer model only (SD31-XXXX-XTXX)

Caution: Writing to registers continuously, such as ramping set points via comms, will damage the SD31 EEPROM memory. See page 59.

[r1;;hi]

[r1.hi]

Output 1 Retransmit High Scale

Set the high scale for the retransmit output.

-1999.0 to 9999.0 (-1999000 to 9999000)

*308, 309 R/W

Output 1 is a process output

(SD_ _ - _ _ _ F - _

_ _ _ ) and

[Ot`1]

is set

[rmt]

[r1;;CO]

[r1.CO]

Output 1 Retransmit Offset

Set the high scale for the process output.

-999.0 to 999.0 (-999000 to 999000)

20.0: mech. relay

5.0: solidstate relay

1.0: switched dc

*310, 311 R/W

Output 1 is a process output

(SD_ _ - _ _ _ F - _

_ _ _ ) and

[Ot`1]

is set

[rmt]

[ti;F1]

[ti.F1]

Output Timer Function 1

Select the states for a timer output during the timing sequence.

[dL;On]

Delay On (0)

[dL;OF]

Delay Off (1)

[S9;On]

Signal On (2)

[S9;OF]

Signal Off (3)

[dL;OF]

Delay Off (1)

410 R/W

Timer model only, SD31-XXXX-XTXX.

[`Ot1]

is set to

[tim]

[S;M1]

[S.M1]

Signal Time Minutes 1

Set the time in minutes for which an output will go to its signal state after the countdown completes.

0 to 99 minutes (0 - 99)

0 (0)

411 R/W

Timer model only, SD31-XXXX-XTXX.

[`Ot1]

is set to

[tim]

[`S;S1]

[ S.S1]

Signal Time Seconds 1

Set the time in seconds for which an output will go to its signal state after the countdown completes.

0 to 59 seconds (0 - 59)

0 (0)

412 R/W

Timer model only, SD31-XXXX-XTXX.

[`Ot1]

is set to

[tim]

[Ot`2]

[ Ot2]

Output 2 Function

Set Output 2 function.

[`OFF]

Off

[Pr;AL]

Process Alarm

[dE;AL]

Deviation Alarm

[hEAt]

Heat Control

[CooL]

Cool Control

[tim]

Timer**

[`OFF]

Output 2 is installed and is not a communications output.

[Ctr2]

Control Method 2

Set Output 2 control type. This parameter is only used with PID control, but can be set anytime.

[`Ftb]

Fixed Time Base

{Urtb]

Variable Time Base

[`Ftb] [Ot`2]

is set to

[hEAt]

[CooL]

and output

type is

SD _ _ - _ _ C _ - _

_ _ _ or SD _ _ - _ _K_ _ _ _ _ .

[Ftb2]

Fixed Time Base 2 (Cycle Time)

Set the time base for Fixed Time Base Control.

1.0 to 60.0 seconds if Output 2 is mechanical relay

0.1 to 60.0 seconds if Output 2 is not a mechanical relay

20.0: mech. relay

5.0: solidstate relay

1.0: switched dc

[Ot`2]

is set to

[hEAt]

[CooL]

, and

[Ctr2]

[`Ftb]

[PL`2]

[ PL2]

Power Limit 2

Set maximum power output for a control output.

0.0 to 100.0% power 100.0%

[Ot`2]

is set to

[hEAt]

[CooL]

[PsL2]

[PSL2]

Output Power Scale Low 2

Set the low end of the range within which the output will scale.

0.0 to 100.0% 0%

[Ot`2]

is set to

[hEAt]

[CooL],[Ctr2

] is set

[`Ftb]

and Output 2 is not a communications output. (not SD_ _ - _ _ U _ -

_ _ _ _ )

Watlow Series SD31 ■ 26 ■ Chapter 5 Setup

Display Parameter Name

Description

Settings Range

(Integer values for Modbus

in parentheses.)

Default Modbus*

(less 40,001

offset)

Read/Write

Appears if:

Note: Some values will be rounded off to fit in the four-character display. Full values can be read with Modbus.

Caution: Writing to registers continuously, such as ramping set points via comms, will damage the SD31 EEPROM memory. See page 59.

[PSH2]

Output Power Scale High 2

Set the high end of the range within which the output will scale.

0.0 to 100.0% 100.0%

[Ot`2]

is set to

[hEAt]

[CooL],[Ctr2]

is set

[`Ftb]

and Output 2 is not a communications output. (not SD_ _ - _ _ U _ -

_ _ _ _ )

[nLF2]

Output Nonlinear Function 2

Select a nonlinear output curve to match the response of your system.

[`OFF]

off

[Cru1]

curve 1

[Cru2]

curve 2

[`OFF] [Ot`2]

is set to

[hEAt]

[CooL]

[ti;F2]

[ti.F2]

Output Timer Function 2

Select the states for a timer output during the timing sequence.

[dL;On]

Delay On

[dL;OF]

Delay Off

[S9;On]

Signal On

[S9;OF]

Signal Off

[dL;OF]

Delay Off

Timer model only, SD31-XXXX-XTXX.

[`Ot2]

is set to

[tim]

[S;M2]

[S.M2]

Signal Time Minutes 2

Set the time in minutes for which an output will go to its signal state after the countdown completes.

0 to 99 minutes

0 Timer model only,

SD31-XXXX-XTXX.

[`Ot2]

is set to

[tim]

[`S;S2]

[ S.S2]

Signal Time Seconds 2

Set the low end of the range within which the output will scale.

0 to 59 seconds

0 Timer model only,

SD31-XXXX-XTXX.

[`Ot2]

is set to

[tim]

[hyS1]

Alarm 1 Hysteresis

Set the hysteresis for an alarm. This determines how far into the safe region the input needs to move before the alarm can be cleared.

0.0 to 999.0 (0000 to 999000)

1.0

*106, 107 R/W

[Ot`1]

is set to

[dE;AL]

[Pr;AL]

[Lgc1]

Alarm 1 Logic

Select the alarm output condition in the alarm state.

[AL`C]

closed on alarm (0)

[AL`O]

open on alarm (1)

[AL`C]

(0)

164 R/W

[Ot`1]

is set to

[dE;AL]

[Pr;AL]

[LAt1]

Alarm 1 Latching

Turn alarm latching on or off.

[nLAt]

off (0)

[`LAt]

on (1)

[nLAt]

(0)

108 R/W

[Ot`1]

is set to

[dE;AL]

[Pr;AL]

[SiL1]

Alarm 1 Silencing

Turn alarm silencing on or off.

[`OFF]

off (0) - no silencing

[``On]

on (1) - silencing

[`OFF]

(0)

109 R/W

[Ot`1]

is set to

[dE;AL]

[Pr;AL]

[dSP1]

Alarm 1 Message

Displays an alarm message when an alarm is active.

[`OFF]

off (0) - no message

[``On]

on (1) - message

[``On]

(1)

110 R/W

[Ot`1]

is set to

[dE;AL]

[Pr;AL]

[hyS2]

Alarm 2 Hysteresis

Set the hysteresis for an alarm. This determines how far into the safe region the input needs to move before the alarm can be cleared.

0.0 to 999.0 1.0

[Ot`2]

is set to

[dE;AL]

[Pr;AL]

Watlow Series SD31 ■ 27 ■ Chapter 5 Setup

Display Parameter Name

Description

Settings Range

(Integer values for Modbus

in parentheses.)

Default Modbus*

(less 40,001

offset)

Read/Write

Appears if:

Note: Some values will be rounded off to fit in the four-character display. Full values can be read with Modbus.

** Timer model only (SD31-XXXX-XTXX)

Caution: Writing to registers continuously, such as ramping set points via comms, will damage the SD31 EEPROM memory. See page 59.

[Lgc2]

Alarm 2 Logic

Select the alarm output condition in the alarm state.

[AL`C]

closed on alarm

[AL`O]

open on alarm

[AL`C] [Ot`2]

is set to

[dE;AL]

[Pr;AL]

[LAt2]

Alarm 2 Latching

Turn alarm latching on or off.

[nLAt]

non-latching - off

[`LAt]

latching - on

[nLAt] [Ot`2]

is set to

[dE;AL]

[Pr;AL]

[SiL2]

Alarm 2 Silencing

Turn alarm silencing on or off.

[`OFF]

off - no silencing

[``On]

on - silencing

[`OFF] [Ot`2]

is set to

[dE;AL]

[Pr;AL]

[dSP2]

Alarm 2 Message

Displays an alarm message when an alarm is active.

[`OFF]

off - no message

[``On]

on - message

[``On] [Ot`2]

is set to

[dE;AL]

[Pr;AL]

[ACLF]

AC Line Frequency

Set the frequency of the applied AC line power source.

[``50]

50 (0)

[``60]

60 (1)

[``60]

(1)

276 R/W

If [Ctr1] or [Ctr2] is set to {

Urtb]

[Unit]

Units of Measurement

Set the type of units used for the PID control parameters.

[``US]

US (0)

[``SI]

SI (1)

[``US]

(0)

45 R/W

Always active.

[I;Err]

[I.Err]

Input Error Latching

Turn input error latching on or off.

[nLAt]

non-latching (0) - off

[`Lat]

latching (1) - on

[nLAt]

(0)

90 R/W

Always active.

[FAIL]

Input Error Failure Mode

Set the input error failure mode when an error is detected and the control changes to manual mode.

[`OFF]

off (0) - 0% power

[bPLS]

bumpless (1) -

current power level

[Man]

manual (2) - fixed

power level

[bPLS]

(1)

252 R/W

Always active.

[MAn]

Input Error Power

Set the manual power level when an input error causes a change to manual mode.

-100.0 to 100.0% (-10000 to 10000)

0.0%

253 R/W

[FAIL}

is set to

[Man]

[`dSP]

[ dSP]

Display Default

Select which display appears normally and which display requires pressing the ß Key to access.

[`Set]

set point normally

appears, press ß Key to view process value (0)**

[`Pro]

process normally ap-

pears, press ß Key to view set point value (1)**

[aC;Ti]

timer normally ap-

pears, press ß key to view process value (2)**

[ti;Ac]

process normally ap-

pears, press ß key to view timer value (3)**

[ti;SP]

set point normally

appears, press ß Key to view timer value (4)**

[to;tt]

press ß key to

toggle between process and timer values (5)**

[~Pro]

(1)

44 R/W

Always active.

Watlow Series SD31 ■ 28 ■ Chapter 5 Setup

Display Parameter Name

Description

Settings Range

(Integer values for Modbus

in parentheses.)

Default Modbus*

(less 40,001

offset)

Read/Write

Appears if:

Note: Some values will be rounded off to fit in the four-character display. Full values can be read with Modbus.

Caution: Writing to registers continuously, such as ramping set points via comms, will damage the SD31 EEPROM memory. See page 59.

[``rP]

[ rP]

Ramping Mode

Select when the control set point ramps to the defined end set point.

[`OFF]

off (0)

[`Str]

ramps on start-up

only (1)

[``On]

ramps at start-up or

any set point change (2)

[`OFF]

(0)

266 R/W

Always active.

[rP;Sc]

[rP.Sc]

Ramp Scale

Select the scale of the ramp rate.

[hour]

degrees/hour (0)

[Min]

degrees/minute (1)

[hour]

(0)

267 R/W

[``rP]

is set to

[`Str]

[``On]

[rP;rt]

[rP.rt]

Ramp Rate

Set the rate for the set point ramp.

0 to 9999 (0000 to 9999000)

100

*268, 269 R/W

[``rP]

is set to

[`Str]

[``On]

Does not appear if

[``rP]

is set to

[`OFF]

[Addr]

Modbus Device Address

Set the device address for communications. Every controller on a network must have a unique address.

1 to 247 1

This can only be set from the controller front panel.

Output 2 is a communications output.

(SD_ _ - _ _ U _ - _ _ _ _ )

[bAud]

Baud Rate

Set the baud rate at which the communications occurs.

[9600]

9600 baud

[`19;2]

19,200 baud

[`38;4]

38,400 baud

[9600]

This can only be set from the controller front panel.

Output 2 is a communications output.

(SD_ _ - _ _ U _ - _ _ _ _ )

[`LOC]

[ LOC]

Lockout

Set the security level for the user interface.

[```0]

(0) No lockout

[```1]

(1) Set Point,

Auto/Manual, alarms only

[```2]

(2) Set Point,

Auto/Manual, only

[```3]

(3) Set Point only

[```4]

(4) Full lockout See the Features Chapter for details.

[```0]

(0)

43 R/W

Always active.

Watlow Series SD31 ■ 29 ■ Chapter 6 Operations

Note: Parameters appear on the Operations Page only if activated from the Programming Page. See page 16 for Operations Page defaults.

Note: Some values will be rounded off to fit in the four-character display. Full values can be read with Modbus.

Caution: Writing to registers continuously, such as ramping set points via comms, will damage the SD31 EEPROM memory. See page 59.

Display Parameter Name

Description

Settings Range

(Integer values for Modbus

in parentheses.)

Default Modbus*

(less 40,001

offset)

Read/Write

Appears if:

Operations Parameters Table

These parameters can be selected to appear on the Operations Page. Select parameters to appear on the Operations Page on the Programming Page.

To go to the Operations Page, press and hold the Infinity Key ˆ for three seconds from the Home Page.

[Oper]

will appear in the display.

• Press the Down ¯ or Up ¿ keys to move through the Operations Page parameters.

• To view or change a parameter value, press and hold the ß Key.

• Press the Down ¯ or Up ¿ keys to change the parameter value.

• Press the Infinity Key ˆ at any time to return to the Home Page.

[Po;ht]

[Po.ht]

Power Heat

Displays the current heat control power.

0.0 to 100.0% power (000 to 10000) (Two decimal places implied for Modbus.)

256 R

[A-M] is set to [auto] and at least one output is set to [hEAt].

[Po;CL]

[Po.CL]

Power Cool

Displays the current cool control power.

0.0 to 100.0% power (000 to 10000) (Two decimal places implied for Modbus.)

257 R

[A-M] is set to [auto] and at least one output is set to [Cool].

[A-m]

[A-M]

Auto-Manual Mode

Set the control mode.

[auto] auto mode (0) [Man] manual mode (1)

[auto] (0)

25 R/W

Always appears.

[`Aut]

[ Aut]

Autotune

Start an autotune.

[`OFF] off (0) [``On] on (1)

[`OFF] (0)

215 R/W

At least one output is set to [hEAt] or

[Cool].

[`Cal]

[ CAL]

Calibration Offset

Offset the input reading.

-999 to 999 (-999000 to 999000)

0.0

*85, 86 R/W

Always appears.

[ht;m]

[ht.M]

Heat Control Method

Set the heat control method.

[`OFF] off (0) [`PID] PID (1) [on;of] on-off (2)

[`PID] (1)

213 R/W

At least one output is set to [hEAt].

[Pb;ht]

[Pb.ht]

Proportional Band Heat

Set the proportional band for the heat outputs.

1 to 999°F, if [`Sen] is set to [``tc] or [`rtd] (1000 to 999000)

0.000 to 999 units, if [`Sen] is set to [`mA] or [uolt]. (0000 to 999000)

*216, 217 R/W

*220, 221 R/W

At least one output is set to [hEAt] and

[ht;m] is set to [`PId].

[rE;ht]

[rE.ht]

Reset Heat

Set the PID reset in repeats per minute for the heat outputs.

0.00 to 99.99 repeats per minute (0000 to 99990)

0.00: disabled

0.00

*224, 225 R/W (Modbus value is integral, which is the inverse of reset.)

At least one output is set to [hEAt], [ht;m] is set to [`PId], and

[Unit]

is set to [``US].

[It;ht]

[It.ht]

Integral Heat

Set the PID integral in minutes per repeat for the heat outputs.

0.00 to 99.99 minutes/per repeat (0000 to 99990)

0.00: disabled

0.00

*224, 225 R/W

At least one output is set to [hEAt], [ht;m] is set to [`PId], and

[Unit]

is set to [``SI].

Watlow Series SD31 ■ 30 ■ Chapter 6 Operations

Display Parameter Name

Description

Settings Range

(Integer values for Modbus

in parentheses.)

Default Modbus*

(less 40,001

offset)

Read/Write

Appears if:

Note: Parameters appear on the Operations Page only if activated from the Programming Page. See page 16 for Operations Page defaults.

Note: Some values will be rounded off to fit in the four-character display. Full values can be read with Modbus.

Caution: Writing to registers continuously, such as ramping set points via comms, will damage the SD31 EEPROM memory. See page 59.

[rA;ht]

[rA.ht]

Rate Heat

Set the PID rate time in minutes for the heat output.

0.00 to 9.99 minutes (0000 to 9990)

0.00: disabled

0.00

*228, 229 R/W

At least one output is set to [hEAt], [ht;m] is set to [`PId], and

[Unit]

is set to [``US].

[dE;ht]

[dE.ht]

Derivative Heat

Set the PID derivative time in minutes for the heat outputs.

0.00 to 9.99 minutes (0000 to 9990)

0.00: disabled

0.00

*228, 229 R/W

At least one output is set to [hEAt], [ht;m] is set to [`PId], and

[Unit]

is set to [``SI].

[dB;ht]

[dB.ht]

Dead Band Heat

An offset of the heating proportional band from the set point.

0 to 999 (0000 to 999000)

*279, 280 R/W

At least one output is set to [hEAt] and

[ht;m] is set to PID.

[h;hyS]

[h.hyS]

Heat Hysteresis

Set the control switching hysteresis for on-off control. This determines how far into the “on” region the input needs to move before the output actually turns on.

1 to 999 degrees, if [`Sen] is set to [``tc] or [`rtd] (1000 to 999000)

0.000 to 999.999 units, if

[`Sen] is set to [`ma] or [uolt]

(0000 to 999999)

1.0

1.000

*232, 233 R/W

*234, 235 R/W

At least one output is set to [hEAt], and

[ht;m] is set to [on;oF].

[CL;m]

[CL.M]

Cool Control Method

Set the Cool Control Method

[`OFF] off (0) [`PId] PID (1) [on;oF] on-off (2)

[`OFF] (0)

214 R/W

At least one output is set to [CooL].

[Pb;CL]

[Pb.CL]

Proportional Band Cool

Set the proportional band for the cool outputs.

1 to 999°F if [`Sen] is set to [``tc] or [`rtd] (1000 to 999000)

0.000 to 999.0 if [`Sen] is set to [`ma] or [uolt] (0000 to 999000)

25.000

*218, 219 R/W

*222, 223 R/W

At least one output is set to [Cool], and

[CL;m] is set to [`PId].

[re;Cl]

[rE.CL]

Reset Cool

Set the PID reset in repeats per minute for the cool output.

0.00 to 99.99 repeats per minute (0000 to 99990)

0.00: disabled

0.00

*226, 227 R/W (Modbus value is integral, which is the inverse of reset.)

At least one output is set to [CooL], [Cl;m] is set to [`PId], and

[Unit]

is set to [``US].

[It;CL]

[It.CL]

Integral Cool

Set the PID integral in minutes per repeat for the cool outputs.

0.00 to 99.99 minutes per repeat (0000 to 99990)

0.00: disabled

0.00

*226, 227 R/W

At least one output is set to [CooL], [CL;m] is set to [`PId], and

[Unit]

is set to [``SI].

Watlow Series SD31 ■ 31 ■ Chapter 6 Operations

Display Parameter Name

Description

Settings Range

(Integer values for Modbus

in parentheses.)

Default Modbus*

(less 40,001

offset)

Read/Write

Appears if:

Note: Parameters appear on the Operations Page only if activated from the Programming Page. See page 16 for Operations Page defaults.

Note: Some values will be rounded off to fit in the four-character display. Full values can be read with Modbus.

** This value multiplied by 100 equals the percent power.

Caution: Writing to registers continuously, such as ramping set points via comms, will damage the SD31 EEPROM memory. See page 59.

[rA;Cl]

[rA.CL]

Rate Cool

Set the PID rate time in minutes for the cool outputs.

0.00 to 9.99 minutes (0000 to 99990)

0.00: disabled

0.00

*230, 231 R/W

At least one output is set to [CooL], [Cl;m] is set to [`PId], and

[Unit]

is set to

[``US].

[dE;CL]

[dE.CL]

Derivative Cool

Set the PID derivative time in minutes for the cool outputs.

0.00 to 9.99 minutes (0000 to 99990)

0.00: disabled

0.00

*230, 231 R/W

At least one output is set to [CooL], [CL;m] is set to [`PId], and

[Unit]

is set to

[``SI].

[dB;Cl]

[db.CL]

Dead Band Cool

An offset of the cooling proportional band from the set point.

0 to 999 (0000 to 999000)

*281, 282 R/W

At least one output is set to [Cool] and

[CL;m] is set to [`PId].

[C;hyS]

[C.hyS]

Cool Hysteresis

Set the control switching hysteresis for on/off control. This determines how far into the “on” region the input needs to move before the output actually turns on.

1 to 999°F if [`Sen] is set to [``tc] or [`rtd] (1000 to 999000)

0.000 to 999.9 if [`Sen] is set to [`ma] or [uolt] (0000 to 999000)

1.000

*236, 237 R/W

*238, 239 R/W

At least one output is set to [CooL] and

[CL;m] is set to [on;oF].

[ProP]

Proportional Term

View the active proportional term for PID diagnostics.

0.000 to 1.000** (0000 to 1000)

258 R

Any output is set to

[heat] or [Cool].

[``it]

[ it]

Integral Term

View the active integral term for PID diagnostics.

0.000 to 1.000** (0000 to 1000)

259 R

Any output is set to

[heat] or [Cool].

[``dE]

[ dE]

Derivative Term

View the active derivative term for PID diagnostics.

0.000 to 1.000** (0000 to 1000)

260 R

Any output is set to [heat] or [Cool].

Watlow Series SD31 ■ 32 ■ Chapter 6 Operations

Display Parameter Name

Description

Settings Range

(Integer values for Modbus

in parentheses.)

Default Modbus*

(less 40,001

offset)

Read/Write

Appears if:

Note: Parameters appear on the Operations Page only if activated from the Programming Page. See page 16 for Operations Page defaults.

Note: Some values will be rounded off to fit in the four-character display. Full values can be read with Modbus.

Caution: Writing to registers continuously, such as ramping set points via comms, will damage the SD31 EEPROM memory. See page 59.

[A1;hi]

[A1.hi]

Alarm 1 High

Set the high alarm set point.

Deviation: 0 to 9999 (0000 to 9999000)

Process: range of sensor, if

[`SEN] is set to [``tc] or [`rtd]

-1999 to 9999 if [`SEN] is set to [`Ma] or [uolt]. (-1999000 to 9999000)

999 (dev)

1500 (pro)

*100, 101 R/W

(dev)

*104, 105 R/W

(pro)

[Ot`1] is set to [dE;AL] or [Pr;AL].

[A1;Lo]

[A1.Lo]

Alarm 1 Low

Set the low alarm set point.

Deviation: -1999 to 0 (-1999000 to 0000)

Process: range of sensor, if

[`SEN] is set to [``tc] or [`rtd]

-1999 to 9999 if [`SEN] is

set to [`Ma] or [uolt]. (-1999000 to 9999000)

-999 (dev)

32 (pro)

*98, 99 R/W

(dev)

*102, 103 R/W

(pro)

[Ot`1] is set to [dE;AL] or [Pr;AL]

[A2;hi]

[A2.hi]

Alarm 2 High

Set the high alarm set point.

Deviation: 0 to 9999

Process: range of sensor, if

[`SEN] is set to [``tc] or [`rtd]

-1999 to 9999 if [`SEN] is set to [`Ma] or [uolt].

999 (dev)

1500 (pro)

[Ot`2] is set to [dE;AL] or [Pr;AL].

[A2;Lo]

[A2.Lo]

Alarm 2 Low

Set the low alarm set point.

Deviation: -1999 to 0

Process: range of sensor, if

[`SEN] is set to [``tc] or [`rtd]

-1999 to 9999 if [`SEN] is set to [`Ma] or [uolt].

-999 (dev)

32 (pro)

[Ot`2] is set to [dE;AL] or [Pr;AL].

[hour]

Countdown Time - Hours

Displays the number of hours remaining for the countdown time.

0 to 99 hours (0 to 99000)

375 R

Timer model only, SD31-XXXX-XTXX.

[`Ot1]

[`Ot2

]is set

[tim]

[Min]

Countdown Time - Minutes

Set the number of minutes remaining for the countdown time.

0 to 59 minutes (0 to 59000)

376 R

Timer model only, SD31-XXXX-XTXX.

[`Ot1]

[`Ot2

]is set

[tim]

Watlow Series SD31 ■ 33 ■ Chapter 6 Operations

Display Parameter Name

Description

Settings Range

(Integer values for Modbus

in parentheses.)

Default Modbus*

(less 40,001

offset)

Read/Write

Appears if:

Note: Parameters appear in the Operations Page only if activated from the Programming Page.

Note: Some values will be rounded off to fit in the four-character display. Full values can be read with Modbus.

* Low numbers contain the two lower bytes; high numbers contain the two higher bytes of the four-byte integer. Decimal precision is set in another parameter.

[`Sec]

[SEc]

Countdown Time - Seconds

Set the number of seconds remaining for the countdown time.

0 to 59 seconds (0 to 59000)

377 R

Timer model only, SD31-XXXX-XTXX.

[`Ot1]

[`Ot2

]is set

[tim]

[Ct;SP]

[Ct.SP]

Closed Loop Timer Set Point

Set the set point to be used during the timer sequence if the controller is in the auto mode.

Set Point Low Limit

[SP;Lo]

to Set Point High

Limit

[SP;hi]

[`Off] Stop controlling to

SP (-200000001)

*404, 405 R/W

Timer model only, SD31-XXXX-XTXX.

[`Ot1]

[`Ot2

]is set

[tim]

[Ot;SP]

[Ot.SP]

Open Loop Timer Set Point

Set the power level to be used during the timer sequence if the controller is in the manual mode.

-100.0 to 0.0% if any output is set to cool; 0.0 to 100.0% if any output is set to heat (-10000 to 0000, 0000 to

10000. Two decimal places implied for Modbus.)

406 R/W

Timer model only, SD31-XXXX-XTXX.

[`Ot1]

[`Ot2

]is set

[tim]

[`rdy

[ rdY]

Ready Band

Set the deviation band, in degrees from set point, that would be considered a ready condition.

1-9999 degrees (1000 - 9999000)

10 (10000)

*395, 396 R/W

Timer model only, SD31-XXXX-XTXX.

[ti;St]

is set to

[~rdy]

or [

rdy;A].

[CC;SP]

[CC.SP]

Closed Loop Control Set Point

Set the control set point to be used when the timer is not active and the controller is in the auto mode.

Set Point Low Limit

[SP;Lo]

to Set Point High

Limit

[SP;hi]

[`Off] Stop controlling to

SP (-200000001)

*27, 28 R/W

Control mode is [auto] and there is no input error.

[OC;SP]

[OC.SP]

Open Loop Control Set Point

Show the current open loop (manual) control set point. The % indicator light is on when the controller is in open loop (manual control).

-100.0 to 0.0% if any output is set to cool; 0.0 to 100.0% if any output is set to heat (-10000 to 0000, 0000 to

10000. Two decimal places implied for Modbus.)

0.0%

26 R/W

Control mode is [Man] and there is no input error.

[hour] / [Po;ht]

48 R/W

[Min] / [

A-m

]

49 R/W

[`Sec] / [`Aut]

50 R/W

[`rdy] / [~CAL]

51 R/W

[Ct;SP] / [ht;m]

52 R/W

[Po;ht] / [pb;ht]

53 R/W

[`Aut] / [re;ht]

54 R/W

[`CAL] / [ra;ht]

55 R/W

[ht;M] / [h;hys]

56 R/W

[pb;ht]

[CL;m]

57 R/W

[re;ht]

[pb;Cl]

58 R/W

[ra;ht]

[re;CL]

59 R/W

[CL;m]

ra;Cl]

60 R/W

[pb;Cl]

[C;hys]

61 R/W

re;CL]

[A1;hi]

62 R/W

ra;Cl]

[A1;Lo]

63 R/W

[A1;hi]

[A2;hi]

64 R/W

[A1;Lo]

[A2;Lo]

65 R/W

[A2;hi]

[none]

66 R/W

[A2;Lo]

[none]

67 R/W

Watlow Series SD31 ■ 34 ■ Chapter 7 Programming

Display Parameter Name

Description

Settings Range

(Integer values for Modbus in paren-

theses.)

Default-

Timer ** /

Standard

Modbus*

(less 40,001

offset)

Read/Write

Appears if:

Programming Page

The Programming Page allows you to select what parameters appear on the Operations Page. To go to the Programming Page, press the ß key and Infinity ˆ keys for six seconds from the Home Page. {Prog} will appear in the display.

• Press the Up ¿ or Down ¯ keys to move through the parameter prompts, P1-P20.

• To change a parameter value, press and hold the ß key, and press the Up ¿ or Down ¯ keys to change the

value.

• Release the ß key and press the Up ¿ or Down ¯ keys to move through the parameter prompts, P1-P20.

• Press the Infinity Key ˆ at any time to return to the Home Page.

[~~P1]

Parameter Location 1

[~~P2]

Parameter Location 2

[~~P3]

Parameter Location 3

[~~P4]

Parameter Location 4

[~~P5]

Parameter Location 5

[~~P6]

Parameter Location 6

[~~P7]

Parameter Location 7

[~~P8]

Parameter Location 8

[~~P9]

Parameter Location 9

[~P10]

Parameter Location 10

[~P11]

Parameter Location 11

[~P12]

Parameter Location 12

[~P13]

Parameter Location 13

[~P14]

Parameter Location 14

[~P15]

Parameter Location 15

[~P16]

Parameter Location 16

[~P17]

Parameter Location 17

[~P18]

Parameter Location 18

[~P19]

Parameter Location 19

[~P20]

Parameter Location 20

Note: All parameter locations have the same range of possible values.

** Timer version only (SDXX-XXXX- XTXX)

All parameter locations always appear on the Programming Page.

**Only appears when the timer option is present. (SD31-XXXXXTXX)

[none] (0) None [`CAL] (1) Calibration Offset [`C-F] (2) Temperature Units (Setup Page) [A1;Lo] (3) Alarm 1 Low [A1;hi;] (4) Alarm 1 High [A2;Lo] (5) Alarm 2 Low [A2;hi] (6) Alarm 2 High [hys1] (9) Alarm Hysteresis 1 (Setup Page) [hys2] (10) Alarm Hysteresis 2 (Setup Page) [addr] (12) Modbus Device Address (Setup

Page)

[`Aut] (13) Autotune [A-m] (14) Auto-Manual [Po;ht] (15) Power Heat [Po;CL] (16) Power Cool [ht;M] (17) Heat Control Method [Pb;ht] (18) Prop. Band Heat [It;ht] (19) Integral Heat OR [re;ht] (19) Reset Heat [dEht] (20) Derivative Heat OR [ra;ht] (20) Rate Heat [db;ht] (21) Dead Band Heat [h;hys] (22) Heat Hysteresis [CL;M] (23) Cool Control Method [Pb;Cl] (24) Prop. Band Cool [It;Cl] (25) Integral Cool OR [rE;Cl] (25) Reset Cool [dE;Cl] (26) Derivative Cool OR [ra;Cl] (26) Rate Cool [db;Cl] (27) Dead Band Cool [C;hys] (28) Cool Hysteresis [prop] (29) Proportional Term [``It] (30) Integral Term [``dE] (31) Derivative Term [rP;rt] (32) Ramp Rate (Setup Page) [hour] (33) Countdown Timer Hours* [Min] (34) Countdown Timer Minutes* [`Sec] (35) Countdown Timer Seconds* [Ct;SP] (36) Closed Loop Timer Set Point* [Ot;SP] (37) Open Loop Timer Set Point* [`rdy] (38) Ready Band* [CC;SP] (39) Closed Loop Control Set Point* [OC;SP] (40) Open Loop Control Set Point*

Watlow Series SD31 ■ 35 ■ Chapter 7 Programming

Programming Page Example

An oven manufacturer wants users of their ovens to have easy access to the Series SD PID parameters. They also want to limit access to other parameters they do not want users to change. This can be achieved by customizing the Operations Page. The Programming Page configuration determines which parameters appear on the Operations Page. The static set point version (SD_C-_ _ _ _- _ _ _ _) has 20 Programming Page locations, P1 to P20. The profiling version (SD_R-_ _ _ _- _ _ _ _) has 23 Programming Page locations, P1 to P23.

The oven manufacturer wants only these parameters to appear on the Operations Page:

• Heat Output Power

• Fahrenheit/Celsius

• Autotune

• Modbus Device Address

To go to the Programming Page, press the ß key and Infinity ˆ keys for six seconds from the Home Page.

{Prog} will appear in the display.

• Press the Up ¿ or Down ¯ keys to move through the parameter prompts, P1-P20.

• To change a parameter value, press and hold the ß key, and press the Up ¿ or Down ¯ keys to change the

value.

• Release the ß key and press the Up ¿ or Down ¯ keys to move through the parameter prompts, P1-P20.

• Press the Infinity Key ˆ at any time to return to the Home Page.

On the Programming Page, select the following settings:

[Po;ht] [~C-F] [~Aut] [Addr] [none] [none] [~~P1] [~~P2] [~~P3] [~~P4] [~~P5] thru [~P20]

To access the Operation Page parameters, press the Infinity ˆ key to return to the Home Page. Press the ß

key to see the Operation Page parameters. Only the parameters selected on the Programming Page appear on the Operations Page.

[~~50] [~~~F] [~Off] [~~~1} [Po;ht] [~C-F] [~Aut] [Addr]

Watlow Series SD31 ■ 36 ■ Chapter 8 Timer

The optional countdown timer (SD31-XXXX-XTXX only) provides a versatile timer function that allows countdown timing that can toggle set points and trigger outputs based on timer settings. During timing, the controller can automatically change to a different set point, and then revert to the original set point after timing completes. Either or both of the SD31's outputs can be designated for the timer output function, which will allow the timer to manipulate the output before, during, and after timing. Timing can also be linked to the ready band, which can stop the timer sequence if the process temperature deviates from the current controller set point. The timer can be used in either the automatic mode or the manual mode, with setting support for both open loop and closed loop set point presets.

Timer Sequence

The timer can always be started by pressing the Down ¯ key from the Home Page. A timer sequence can include:

• Switching to a timer set point.

• Counting down the time.

• Triggering a timer output.

• Stopping the countdown using the ready band.

Countdown Timer Keys

• To start the timer sequence - Press the Down ¯ key

• To re-start the timer sequence at the beginning - Press the Down ¯ key

• To acknowledge the ready state when using the ready with acknowledge method - Press the Down ¯ key

• To stop the timer sequence before it is complete - Press the Up ¿ key

Countdown Timer Displays

Timer Colon - The colon helps to indicate the status of the timer function. The colon blinks when timing is occurring and is lit steady when timing is paused or not occurring.

Time Display - The time for the countdown timing is recorded in terms of hours, minutes, and seconds. The display of the time is a floating display that will display in hours and minutes until the hours countdown to zero, at which time the display will shift to displaying minutes and seconds.

Colon Blinks Colon Steady

During timer countdown Before and after timing

After countdown, but during signal timing When waiting on the Ready Band

Countdown Timer

Watlow Series SD31 ■ 37 ■ Chapter 8 Timer

Prompt Timer Related Settings

Timer Enable

{ti;En}

[ti.En]

Set to {~~On} to enable the timer.

Hours

{hour}

[hour]

Set the number of hours for the countdown time.

Minutes

[Min]

Set the number of minutes for the countdown time.

Seconds

[~Sec]

[ Sec]

Set the number of seconds for the countdown time.

Timer Start Method

[ti;St]

[ti.St]

[Imd] Immediate Method - Timer sequence starts on a Down ¯ key press at the Home Page. Timer countdown starts immediately. Timer does not make use of the Ready Band.

[~rdy] Ready Method - Timer sequence starts on a Down ¯ key press at the Home Page. Timer countdown is linked to the ready status. Timing is automatically paused until the process value is within the Ready Band. Timing is automatically continued once the process value returns to within the Ready Band.

[rdyA] Ready with Acknowledge Method - Timer sequence starts on a Down ¯ key press at the home page. Timer countdown is linked to the ready status. Actual timer countdown does not start until the Down ¯ key is pressed again while the process value is within the ready band. The timer will operate as described in the ready method.

[PWr] Power Up Method - Timer sequence starts on initial power up of the controller without a key press. Timer does not make use of the Ready Band. After the completion of the first timer sequence, a press of the Down ¯ key at the Home Page, will repeat the timer sequence.

Watlow Series SD31 ■ 38 ■ Chapter 8 Timer

Prompt Timer Related Settings

Timer Set Point

[ti;SP]

[ti.SP]

[~Off] Set Point Off - The normal control set point will continue to be displayed, but the SD31 will use a set point of "Off" during the timing sequence.

[trAc] Set Point Tracking - Uses the same set point both in and out of the timer sequence.

[Pre;S] Preset Set Point - Allows programming of a set point for use in the timer sequence and a separate set point for use outside of the timer sequence.

Ready Band Value

{~rdy}

[ rdY]

Select the acceptable +/- range for process value deviation from the set point and still be considered in a ready status. If enabled, the Rdy LED is lit when the process value is within the ready band range of the set point. The Ready band is also linked to the Ready and Ready with Acknowledge timer methods, to limit timer countdown to within the ready band.

Ready Light Enable

{rdy;L}

[rdY.L]

Set to {~~On] to enable the lighting of the Ready Light when the process temperature is within the Ready Band window.

Output1 or Output 2 Function {~Ot1} , {~Ot2} [ Ot1], [ Ot2]

Set Output 1 or Output 2 to timer, [tiM] , to designate an output as a timer output. This allows the timer sequence to manipulate the output's state.

Preset

• SP is used when not timing

• Preset is used during the timer sequence

RDY

Watlow Series SD31 ■ 39 ■ Chapter 8 Timer

Prompt Timer Related Settings

Timer Output Function [ti;F1], [ti;F2] [ti.F1] , [ti.F2]

Each timer output can independently have its timer output function selected. Delay On, Delay Off, Signal On, and Signal Off.

Delay On

[dl;On]

[dl.On]

Output is energized before timer sequence; de-energized during timer sequence; energized after timer sequence.

[dl;On]

Delay Off

[dl;OF]

[dl.OF]

Output is de-energized before timer sequence; energized during timer sequence; de-energized after timer sequence

[dl;Of]

Signal On

[Sg;On]

[Sg.On]

Output is de-energized before timer sequence; de-energized during timer countdown; energized for the signal time, de-energized after signal time

[Sg;On]

Signal Off

[Sg;OF]

[Sg.OF]

Output is energized before timer sequence; energized during timer countdown; de-energized for the signal time, energized after signal time.

[SG;OF]

Delay ON

Timer

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

Delay OFF

Timer

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

Signal ON

Signal Time

Timer

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

Signal OFF

Signal Time

Timer

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

Watlow Series SD31 ■ 40 ■ Chapter 8 Timer

Prompt Timer Related Settings

Signal Time - Minutes [S;M1], [S;M2] [S.M1], [S.M2]

Set the number of minutes for the signal time. Signal time appears with the Signal On and Signal Off timer output functions. This is the time for which a timer output will either be energized or de-energized at the end of the timer countdown. Each timer output can independently have a signal time programmed.

Signal Time -Seconds [~S;S1], [~S;S2] [ S.S1], [ S.S2]

Set the number of seconds for the signal time. Signal time appears with the Signal On and Signal Off timer output functions. This is the time for which a timer output will either be energized or de-energized at the end of the timer countdown. Each timer output can independently have a signal time programmed.

Display Default

[~Dsp]

[ dSP]

When the timer is enabled, four additional choices exist for the display default. The primary display is the normal display prompt. The secondary display, if available, will display the secondary prompt for five seconds after a press of the ß key and then return to the primary prompt.

Actual Process / Time

[Ac;ti]

[Ac.ti]

Countdown time is the primary display. The actual process value is the secondary display.

Time / Actual Process

[ti;Ac]

[ti.Ac]

Actual process value is the primary display. The countdown time is the secondary display.

Time / Set Point

[ti;SP]

[ti.SP]

Set point is the primary display. The countdown time is the secondary display.

Time / Actual Process (toggle)

[to;tt]

[to.tt]

Toggles between actual process value and countdown time with a press of the ß key. There is no secondary value.

Watlow Series SD31 ■ 41 ■ Chapter 8 Timer

Prompt Timer Related Settings

Closed Loop Timer Set Point

[Ct;SP]

[Ct.SP]

Sets the set point that will be used during the timer sequence when the controller is in the automatic control mode and the Timer Set Point, [ti;SP] , is set to Preset Set point, [Pre;S].

Open Loop Timer Set Point

[Ot;SP]

[Ot.SP]

Sets the manual power level that will be used during the timer sequence when the controller is in the manual mode and the Timer Set Point, [ti;SP] , is set to Preset Set point, [Pre;S].

Closed Loop Control Set Point

[CC;SP]

[CC.SP]

Sets the set point that will be used outside of the timer sequence when the controller is in the automatic control mode and the Timer Set Point, [ti;SP] , is set to Preset Set point, [Pre;S]. If [ti;SP] is not set to [Pre;S], then this set point is always used for closed loop control in the automatic mode.

Open Loop Control Set Point

[OC;SP]

[OC.SP]

Sets the manual power level that will be used outside of the timer sequence when the controller is in the manual control mode, and [ti;SP] is set to [Pre;S]. If [ti;SP] is not set to [Pre;S], then this set point is always used for manual power level in the manual mode.

Watlow Series SD31 ■ 42 ■ Chapter 8 Timer

Timer Example

Convection Oven Application

A master chef bakes bread at 350 F for 30 minutes. She wants the oven at the proper temperature with an indication when it is ready to begin baking. She isn't concerned if the oven is 10 degrees cool at first. After she loads the oven, the chef wants to start the countdown time by pressing a key. When the baking time is complete, she wants a 10-second audible indication that the bread is done. She would also like to easily be able to monitor both the countdown time and the temperature during the baking process.

Recommended Controller

Series SD31 controller part number of SD31-HCJA-AT0R.

• Output 1 is a switched DC output connected to a Din-A-Mite solid state power controller to control the oven's heaters.

• Output 2 is an electromechanical relay connected to an audible indicator to provide the completion indication.

In the Setup Page, program the following parameters:

[~C-F] = [~~~F] Set the controller to Fahrenheit [ti;En] = [~~On] Enable the Timer Function [hour] = 0 Set the hours of countdown timing to 0. [Min] = 30 Set the minutes of countdown timing to 30. [~Sec] = 0 Set the seconds of countdown timing to 0. [ti;St] = [rdyA] Configure the timer for Ready with Acknowledge. [ti;SP] = [Pre;S] Use the preset set point for the timing sequence. [~rdY] = 10 Set the ready band at 10 . [rdY;L] = [~~On] Enable the ready light for the "begin baking" indication. [~Ot2] = [TiM] Configure Output 2 as a timer output. [ti;F2] = [sg;On] Select "signal on" to provide the completion signal. [S;M2] = 0 Set the signal time minutes to 0. [~S;S2] = 0 Set the signal time seconds to 0. [~dsp] = [to;tt] Set to toggle between countdown time and process temperature using ß key. [Ct;SP] = 350 Set the timer sequence set point to 350 . [CC;SP] = Off Set the set point to Off when not timing.

Operator/Control Actions

• With the oven "off", the chef starts the preheat cycle by pressing the Down ¯ key. The RDY LED is off. Series SD31 begins to control to the 350°F bake set point.

• The chef can press the ß key to toggle between the process temperature and the timer countdown. Viewing the temperature, the chef should see it progressing up toward 350°F. Toggling over to the countdown time, she should see the countdown paused and the colon having a steady indication.

• When 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 the Down ¯ key to acknowledge the Ready Band, starting the bake cycle.

• Time starts counting down. The countdown time displays a flashing colon.

• If the 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 Up ¿ key. The Series SD31 then automatically shifts to the idle set point, Off .

Watlow Series SD31 ■ 43 ■ Chapter 9 Factory

Display Parameter Name

Description

Settings Range

(Integer values for Modbus

in parentheses.)

Default Modbus*

(less 40,001

offset)

Read/Write

Appears if:

Factory Page and Calibration

To go to the Factory Page, press both the Down ¯ and Up ¿ keys for six seconds from the Home Page.

[`SEt]

will

appear in the display after three seconds. Continue to hold both keys until [FAct] appears in the display.

• Press the Down ¯ or Up ¿ keys to move through the Factory Page parameters.

• To view or change a parameter value, press and hold the ß Key.

• Press the Down ¯ or Up ¿ keys to change the parameter value.

• Press the Infinity Key ˆ at any time to return to the Home Page.

[AMb]

Ambient Temperature

Displays the current calculated ambient temperature.

-50.0 to 300.0°F (-50000 - 300000)

277 R 278 R

Always active.

[A;mn]

[A.Mn]

Minimum Recorded Ambient Temperature

Displays the minimum recorded ambient temperature.

-50.0 to 300.0°F (-50000 - 300000)

NA NA Always active.

[A;ma]

[A.MA]

Maximum Recorded Ambient Temperature

Displays the maximum recorded ambient temperature.

-50.0 to 300.0°F (-50000 - 300000)

NA NA Always active.

[DSPL]

[dSPL]

Display Intensity

Increase or decrease the brightness of the upper and lower display.

15 to 100% duty 100

Always active.

[A;Ot1]

[A.Ot1]

Output 1 Process Value

Monitors Process Output 1 value via Modbus.

00.00 to 22.00 units (0000 to 2200)

283 R

Process output installed for Output 1

[rESt]

Restore Factory Calibration

Replaces the user calibration parameters with the factory calibration parameters.

[~~no] (0) [~yES] (1)

[~~no] (0)

208 R/W

Always active.

[Usr;r]

[Usr.r]

Restore User Settings

Restores the customer’s configured settings.

[~~no] (0) [~yES] (1)

[~~no] (0)

209 R/W

Always active.

[USr;S]

[USr.S]

Save User Settings

Saves the current customer-configured settings.

[~~no] (0) [~yES] (1)

[~~no] (0)

210 R/W

Always active.

[dFLt]

Default Parameters

Reset all parameters to their default values.

[~~no] (0) [~yES] (1)

[~~no] (0)

207 R/W

Always active.

[O;ty1]

[O.ty1]

Output 1 Type

Displays the hardware type for Output 1.

[nonE] none (0) [~~DC] DC/open collect. (1) [rLAY] mech. relay (2) [~SSr] solid-state relay (3) [Proc] process (4)

[none] (0)

202 R

Always active.

Watlow Series SD31 ■ 44 ■ Chapter 9 Factory

Display Parameter Name

Description

Settings Range

(Integer values for Modbus

in parentheses.)

Default Modbus*

(less 40,001

offset)

Read/Write

Appears if:

[O;ty2]

[O.ty2]

Output 2 Type

Displays the hardware type for Output 2.

[nonE] none (0) [~~DC]

DC/open collect. (1)

[rLAY] mech. relay (2) [~SSr] solid-state relay (3) [COM]

communications (5)

[nonE] (0)

203 R

Always active.

[`S;id]

[ S.id]

Software ID

Displays the software ID number.

0 to 9999 (0 - 9999)

10 R

Always active.

[S;UEr]

[S.VEr]

Software Version

Displays the firmware revision.

0.00 to 99.99 (0 - 9999)

11 R

Always active.

[S;bLd]

[S.bLd]

Software Build Number

Displays the software build number.

0 to 9999 Build Number (0 - 9999)

13 R

Always active.

[PWr]

Power Type

Displays the type of input power.

[~~AC] high voltage [LOW] low voltage

*NA

Always active.

[`Sn-]

[ Sn-]

Serial Number 1

Displays the first four characters of the serial number.

0 to 9999 (0 - 9999)

7, 8 R

Always active.

[`Sn_]

[ Sn_-]

Serial Number 2

Displays the last four characters of the serial number.

0 to 9999 (0 - 9999)

7, 8 R

Always active.

[tc;50]

[tc.50]

Thermocouple, 50mV

Calibrate the thermocouple input to 50mV (see “Calibrating the Series SD31”).

[``no] [`yes]

[``no]

*NA

Always active.

[tc;00]

[tc.00]

Thermocouple, 0mV

Calibrate the thermocouple input to 0mV (see “Calibrating the Series SD31”).

[``no] [`yes]

[``no]

*NA

Always active.

[tc;32]

[tc.32]

Thermocouple, 32°F

Calibrate the thermocouple input to 0°C (32°F) (see “Calibrating the Series SD31”).

[``no] [`yes]

[``no]

*NA

Always active.

[`r;15]

[ r.15]

RTD, 15 ohm

Calibrate the RTD input to 15 ohm (see “Calibrating the Series SD31”).

[``no] [`yes]

[``no]

*NA

Always active.

[r;380]

[r.380]

RTD, 380 ohm

Calibrate the RTD input to 380 ohms. (see “Calibrating the Series SD31”).

[``no] [`yes]

[``no]

*NA

Always active.

[``U;1]

[ v.1]

Input Calibrate, 1.0 Volt

Calibrate the process voltage input to 1.0 Volt (see “Calibrating the Series SD31”).

[``no] [`yes]

[``no]

*NA

Always active.

[``U;9]

[ v.9]

Input Calibrate, 9.0 Volt

Calibrate the process voltage input to 9.0 Volt (see “Calibrating the Series SD31”).

[``no] [`yes]

[``no]

*NA

Always active.

Watlow Series SD31 ■ 45 ■ Chapter 9 Factory

Display Parameter Name

Description

Settings Range

(Integer values for Modbus

in parentheses.)

Default Modbus*

(less 40,001

offset)

Read/Write

Appears if:

[``A;4]

[ A.4]

Input Calibrate, 4.0 mA

Calibrate the process current input to 4.0 mA (see “Calibrating the Series SD31”).

[``no] [`yes]

[``no]

*NA

Always active.

[`A;16]

[ A.16]

Input Calibrate, 16.0 mA

Calibrate the process current input to

16.0 mA.

[``no] [`yes]

[``no]

*NA

Always active.

[O1;1u]

[O1.1v]

Output 1 Calibrate, 1.0 Volt

The voltage process output transmits

1.000V.

[``no] [`yes]

[``no]

*NA

Process output installed for Output 1.

[O1;9u]

[O1.9v]

Output 1 Calibrate, 9.0 Volt

The voltage process output transmits

9.000V.

[``no] [`yes]

[``no]

*NA

Process output installed for Output 1.

[O1;4A]

[O1.4A]

Output 1 Calibrate, 4.0 mA

The current process output transmits

4.000 mA.

[``no] [`yes]

[``no]

*NA

Process output installed for Output 1.

[O1;16]

[O1.16]

Output 1 Calibrate, 16.0 mA

The current process output transmits

16.000 mA.

[``no] [`yes]

[``no]

*NA

Process output installed for Output 1.

* The Series SD31 controller can be calibrated only with the front panel controls. These parameters are not accessible through serial communications.

Watlow Series SD31 ■ 46 ■ Chapter 9 Factory

Calibrating the Series SD31

Warm up the unit for 20 minutes. To reach the cali-

bration parameters, enter the Factory Page by pressing and holding both the Down Key ¯ and Up Key ¿ for six seconds. Once on the Factory Page [FACT], use the Down Key ¯ to select a parameter. Press and hold the ß Key to view or change the parameter value. The last parameters on the Factory Page are the input and output calibration parameters.

You can restore the original factory calibration with

Restore Factory Calibration [rESt] (Factory Page).

*Note: INFOSENSETMshould be turned off while verifying calibration of the controller with a calibration source.

Thermocouple Input Procedure

Equipment

• Type J reference compensator with reference junction at 0°C (32°F), or type J thermocouple calibrator to 0°C (32°F).

• Precision millivolt source, 0 to 50 mV minimum range, 0.002 mV resolution.

Input Setup and Calibration

1. Connect the correct power supply to terminals 1 and 2 (see Chapter Two).

2. Connect the millivolt source to terminals 11 (-) and 10 (+) with copper wire.

3. Enter 50.00 mV from the millivolt source. Allow at least 10 seconds to stabilize. Press the Down Key ¯ until the Thermocouple Calibration 50 mV parameter [tc;50] appears. Press and hold the ß Key and change [`~no] to [`yES] by pressing the Down Key ¯. Release the ß Key and press the Down Key ¯ to store 50.000 mV input and move to the next parameter.

4. Enter 0.000 mV from the millivolt source. Allow at least 10 seconds to stabilize. At the Thermocouple Calibration 0 mV parameter [tc;00] , press and hold the ß Key and change [`~no] to [`yES] by pressing the Down Key ¯. Release the ß Key and press the Down Key ¯ to store 0.000 mV input and move to the next parameter.

5. Disconnect the millivolt source and connect the reference compensator or thermocouple calibrator to terminals 11 (-) and 10 (+). With type J thermocouple wire, if using a compensator, turn it on and short the input wires. When using a type J calibrator, set it to simulate 0°C (32°F). Allow 10 seconds for the controller to stabilize.Press the Down Key ¯ until the Thermocouple Calibration 32° parameter [tc;32] , appears. Press and hold the ß Key and change [`~no] to [`yES] by pressing the Down Key ¯. Release the ß Key and press the Down Key ¯ to store the 32° input. and move to the next parameter or press the Infinity Key ˆ to exit the Factory Page.

6. Rewire for operation and verify calibration.

RTD Input Procedure

Equipment

•1 kΩ decade box with 0.01Ω resolution.

Input Setup and Calibration

1. Connect the correct power supply to terminals 1 and 2 (see Chapter 2).

2. Connect the decade box to terminals 10 (S1), 11 (S3) and 8 (S2), with 20 to 24-gauge wire.

3. Enter 15.00Ω from the decade box. Allow at least

10 seconds to stabilize. Press the Down Key ¯ until

the RTD Calibration 15Ω parameter [`r;15] ap-

pears. Press and hold the ß Key and change [`~no] to [`yES] by pressing the Down Key ¯. Re- lease the ß Key and press the Down Key ¯ to

store 15Ω input and move to the next parameter.

4. Enter 380.00Ω from the decade box. Allow at least

10 seconds to stabilize. At the RTD Calibration

380Ω parameter [r;380] , press and hold the ß

Key and change [`~no] to [`yES] by pressing the Down Key ¯. Release the ß Key and press the

Down Key ¯ to store 380Ω input and move to the

next parameter or press the Infinity Key ˆ to exit the Factory Page.

5. Rewire for operation and verify calibration.

Voltage Process Input Procedure

Equipment

• Precision voltage source, 0 to 10V minimum range, with 0.001V resolution.

Input Setup and Calibration

1. Connect the correct power supply to terminals 1 and 2 (see Chapter Two).

Input

2. Connect the voltage source to terminals 11 (-) and 9 (+) of the controller.

3. Enter 1.00V from the voltage source to the controller. Allow at least 10 seconds to stabilize. Press the Down Key ¯ until the Input Calibrate 1V parameter, [``u;1] appears. Press and hold the ß Key and change [`~no] to [`yES] by pressing the Down Key ¯. Release the ß Key and press the Down Key ¯ to store 1.00V input and move to the next parameter.

4. Enter 9.00V from the voltage source to the controller. Allow at least 10 seconds to stabilize. At the Input Calibrate 9V parameter, [``u;9] , press and hold the ß Key and change [`~no] to [`yES] by pressing the Down Key ¯. Release the ß Key and press the Down ¯ to store 9.00V input and move to the next parameter or press the Infinity Key ˆ to exit the Factory Page.

5. Rewire for operation and verify calibration.

Watlow Series SD31 ■ 47 ■ Chapter 9 Factory

Current Process Input Procedure

Equipment

• Precision current source, 0 to 20 mA range, with

0.01 mA resolution.

Input Setup and Calibration

1. Connect the correct power supply to terminals 1 and 2 (see Chapter Two).

2. Connect the current source to terminals 11(-) and 8(+).

3. Enter 4.00 mA from the current source to the controller. Allow at least 10 seconds to stabilize. Press the Down Key ¯ until the Input Calibrate 4 mA parameter, [``A;4] appears. Press and hold the ß Key and change [`~no] to [`yES] by press- ing the Down Key ¯. Release the ß Key and press the Down Key ¯ to store the 4 mA input and move to the next parameter.

4. Enter 16.00 mA from the current source to the controller. Allow at least 10 seconds to stabilize. At the Input Calibrate 16 mA parameter, [`A;16] , press and hold the ß Key and change [`~no] to

[`yES] by pressing the Down Key ¯. Release the ß Key and press the Down Key ¯ to store the

16 mA input and move to the next parameter or press the Infinity Key ˆ to exit the Factory Page.

5. Rewire for operation and verify calibration.

Process Output Procedures

Equipment

• Precision volt/ammeter with 3.5-digit resolution.

Output 1 Setup and Calibration

1. Connect the correct power supply to terminals 1 and 2 (see Chapter Two).

Volts

2. Connect the volt/ammeter to terminals 7 (-) and 6 (+).

3. Press the Down Key ¯ until the Output 1 Calibrate 1 V parameter, [01;1u] appears. Press and hold the ß Key and change [`~no] to [`yES] by pressing the Down Key ¯. Release the ß Key. The voltage output value appears in the display. Press the Up ¿ or Down Key ¯ to adjust the display value to match the value from the volt/ammeter. The unit should stabilize within one second. Repeat until the volt/ammeter reads 1.00 V, ±0.1 V. Press the Down Key ¯ to store the value and move to the next parameter.

4. At Output 1 Calibrate 9 V parameter [01;9u], press and hold the ß Key and change [`~no] to

[`yES] by pressing the Down Key ¯. Release the ß Key. The voltage output value appears in the

display. Press the Up ¿ or Down Key ¯ to adjust the display value to match the value from the volt/ammeter. The unit should stabilize within one second. Repeat until the volt/ammeter reads 9.00 V, ±0.1 V. Press the Down Key ¯ to store the value and move to the next parameter or press the Infinity Key ˆ to exit the Factory Page.

5. Rewire for operation and verify calibration.

Milliamperes

6. Connect the volt/ammeter to terminals 7 (-) and 5 (+).

7. Press the Down Key ¯ until the Output 1 Calibrate 4 mA parameter, [01;4a] appears. Press and hold the ß Key and change [`~no] to [`yES] by pressing the Down Key ¯. Release the ß Key. The current output value appears in the display. Press the Up ¿ or Down Key ¯ to adjust the display value to match the value from the volt/ammeter. The unit should stabilize within one second. Repeat until the volt/ammeter reads 4.00 mA, ±0.1 mA. Press the Down Key ¯ to store the value and move to the next parameter.

8. At Output 1 Calibrate 16 mA parameter [01;16], press and hold the ß Key and change [`~no] to

[`yES] by pressing the Down Key ¯. Release the ß Key. The current output value appears in the

display. Press the Up ¿ or Down Key ¯ to adjust the display value to match the value from the volt/ammeter. The unit should stabilize within one second. Repeat until the volt/ammeter reads 16.00 mA, ±0.1 mA. Press the Down Key ¯ to store the value and move to the next parameter or press the Infinity Key ˆ to exit the Factory Page.

9. Rewire for operation and verify calibration.

Restoring Factory Calibration

• Press the Up ¿ and Down ¯ keys together for six seconds until [FaCT] appears in the display.

• Press the Down Key ¯ to step through the parameters until the [rESt] appears.

• Press and hold the ß Key and change [`~no] to

[`yES] by pressing the Down Key ¯. Release the ß Key and press the Infinity Key ˆ to exit the

Factory Page.

Watlow Series SD31 ■ 48 ■ Chapter 10 Features

Features

Saving and Restoring User Settings . . . . . . . . . . . . . . . . . . .49

Operations Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

Autotuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

Manual Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50

Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50

INFOSENSE™ Temperature Sensing . . . . . . . . . . . . . . . .50

Calibration Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50

Filter Time Constant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

Sensor Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

Access Lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

Set Point Low Limit and High Limit . . . . . . . . . . . . . . . . . .51

High Scale and Low Scale . . . . . . . . . . . . . . . . . . . . . . . . .51

High Range and Low Range . . . . . . . . . . . . . . . . . . . . . . .52

Control Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

Output Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

Auto-Manual Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

On-Off Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

Proportional Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

PI Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

PID Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

Dead Band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

Power limiting and power scaling . . . . . . . . . . . . . . . . . . . .54

Nonlinear output curve . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

Independent Heat and Cool PID . . . . . . . . . . . . . . . . . . . .55

Variable Time Base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

Ramping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

Process or Deviation Alarms . . . . . . . . . . . . . . . . . . . . . . .56

Alarm Set Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

Alarm Hysteresis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

Alarm Latching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

Alarm Silencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

Retransmit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

Setting Up a Modbus Network . . . . . . . . . . . . . . . . . . . . . .58

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60

Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62

Saving and Restoring User Settings

Recording setup and operations parameter settings for future reference is very important. If you unintentionally change these, you will need to program the correct settings back into the controller to return the equipment to operational condition.

After you program the controller and verify proper operation, use [USr;S] to save the settings into a special section of memory. If the settings in the controller are altered and you want to return the controller to the saved values, use [USr;R] to recall the saved settings.

To save the Setup and Operations parameters:

1. Ensure all the settings that you want to store are

already programmed into the Setup Page and Operations parameters.

2. Press the Up ¿ and Down ¯ keys together for six

seconds until [Fact] appears in the display.

3. Press the Down Key ¯ to step through the parame-

ters until the [USr;S] parameter appears.

4. Press and hold the ß Key and change [`~no] to

[SEt1] or [SEt2] by pressing the Down Key ¯.

5. Release the ß Key and press the Infinity Key ˆ

to exit the Factory Page.

Note: Only perform the above procedure when you are sure that all the correct settings are programmed into the controller. Saving the settings overwrites any previously saved collection of settings. Be sure to document all the controller settings.

To restore a collection of saved settings:

1. Press the Up ¿ and Down ¯ keys together for six

seconds until [Fact] appears in the display.

2. Press the Down Key ¯ to step through the parame-

ters until the [USr;R] parameter appears.

3. Press and hold the ß Key and change [`~no] to

[SEt1] or [SEt2] by pressing the Down Key ¯.

4. Release the ß Key and press the Infinity Key ˆ

to exit the Factory Page.

Operations Page

Watlow’s patented user-defined menu system improves operational efficiency. The user-defined Operations Page provides you with a shortcut to monitor or change the parameter values that you use most often. You can go directly to the Operations Page from the Home Page by pressing and holding the Infinity Key ‰.

You can create your own Operations Page with as many as 20 of the active parameters from the list in the Keys and Displays chapter. When a parameter normally located on the Setup Page is placed on the Operations Page, it is accessible through both. If you change a parameter on the Operations Page, it is automatically changed in its original page. If you change a parameter in its original page it is automatically changed on the Operations Page.

The default parameters will automatically appear on

the Operations Page.

To change the list of parameters appearing on the

Operations Page, hold down the Infinity key ˆ, then press the Advance Key ‰, and hold both down for about six seconds until [Prog] appears in the display. This is the Programming Page.

Press the Down Key ¯ once to go to the first Pro-

gramming Page selection. The parameter choices P1P20 appear in the display. Press and hold the ß Key and use the Up ¿ or the Down ¯ Key to change the selected parameter for each Programming Page location. If you do not want a parameter to appear for that location, select [nonE]. To change the other 19 selections, release the ß Key and use the Up ¿ or the Down ¯ Key to select [``P1] to [`p20].

Changes made to the Operations Page will persist until changed by the operator or defaulted by full defaults or user defaults. User-defined parameters are not over-written by default parameters if those features become enabled. Only parameters supported by a controller’s particular hardware configuration and programming settings will appear.

Autotuning

The autotuning feature allows the controller to measure the system response to determine effective settings for PID control. When autotuning is initiated the controller reverts to on-off control. The temperature must cross the Autotune Set Point four times to complete the autotuning process. Once complete, the controller controls at the normal set point, using the new parameters.

To initiate an autotune, set Autotune [`Aut] (Operations parameters) to [``On].

Watlow Series SD31 ■ 49 ■ Chapter 10 Features

Autotune begins

Process Set Point

Autotune complete

Temperature

Autotune Set Point

(90 percent of Process Set Point)

Time

Manual Tuning

In some applications, the autotune process may not come up with PID parameters that provide the process characteristics you desire. If the autotune does not provide satisfactory results, you will have to perform a manual tune on the process:

1. Apply power to the Series SD31 and establish a

set point typically used in your process.

2. Go to the Operations Page, and establish values

for the PID parameters: Proportional Band = 5; Reset* =

0.00; Rate* = 0.00. Note: Autotune should be set to off.

3. When the system stabilizes, watch the process value. If this value fluctuates, increase the proportional band setting until it stabilizes. Adjust the proportional band in 3° to 5° increments, allowing time for the system to stabilize between adjustments.

4. When the Input has stabilized, watch the percent power , (Po.ht or Po.cl). It should be stable ±2%. At this point, the process temperature should also be stable, but it will have stabilized before reaching set point. The difference between set point and actual can be eliminated with reset.

5. Start with a reset* value of 0.01 (99.99)** and allow 10 minutes for the process temperature to get to set point. If it has not, double (halve) ** the setting and wait another 10 minutes. Continue doubling (halving) ** every 10 minutes until the process value equals the set point. If the process becomes unstable, the reset* value is too large (small) **. Decrease (increase) ** the reset value until the process stabilizes.

6. Increase Rate* to 0.10 minute. Then increase the set point by 11° to 17°C. Monitor the system's approach to the set point. If the process value overshoots the set point, increase Rate* to 0.50 minute. Increase the set point by 11° to 17°C and watch the approach to the new set point. If you increase Rate* too much, the approach to the set point will be very sluggish. Repeat as necessary until the system rises to the new set point without overshoot or sluggishness.

*With the [unit] parameter set at [SI] ( Setup

Page) Integral will appear in place of Reset and Derivative will appear in place of Rate.

**Integral is the reciprocal of reset. For Integral in-

stead of reset, use the values in parentheses.

For additional information about autotune and PID

control, see related features in this chapter.

Inputs

INFOSENSE™ Temperature Sensing

Watlow’s INFOSENSE™ feature can improve temperature sensing accuracy by 50%. Watlow’s INFOSENSE™ thermocouples and RTD temperature sensors must be used together to achieve these results.

Each INFOSENSE™ “smart” sensor contains four numeric values that are programmed into the SD mem-

ory. These values characterize Watlow sensors, for the controller to provide greater accuracy.

Turn the INFOSENSE™ feature on or off with

INFOSENSE™ Enable [IS;En] (Setup Page). Set the four numerical values supplied with Watlow’s INFOSENSE™ in the [IS;P1], [IS;P2], [IS;P3] and [IS;P4] parameters.

Contact your Watlow salesperson or Watlow authorized distributor for the pricing and availability of Watlow INFOSENSE™ products.

The four numerical values are found on the tag attached to the sensor.

Calibration Offset

Calibration offset allows a device to compensate for an inaccurate sensor, lead resistance or other factors that affect the input value. A positive offset increases the input value, and a negative offset decreases the input value.

The input offset value can be viewed or changed with Calibration Offset [`CAL] (Operations parameters).

Watlow Series SD31 ■ 50 ■ Chapter 10 Features

IS1 IS2 IS3 IS4

123 456 789 258

Negative Calibration Offset will

Temperature Reading

from Sensor

Temperature

Actual Process Temperature

compensate for the difference between the Sensor Reading and the Actual Temperature

Time

Filter Time Constant

Filtering smoothes an input signal by applying a first-order filter time constant to the signal. The displayed value, the controlled value or both the displayed and controlled values can be filtered. Filtering the displayed value makes it easier to monitor. Filtering the signal may improve the performance of PID control in a noisy or very dynamic system.

Select filter options with Input Filter [Ftr;E]. Select the Filter Value with [FLtr] (Setup Page).

Sensor Selection

You need to configure the controller to match the input device, which is normally a thermocouple, RTD or process transmitter. When you select an input device, the controller automatically sets the input linearization to match the sensor. It also sets high and low limits, which in turn limit the set point range-high and rangelow values.

Select the sensor type with Sensor Type [`Sen] (Setup Page).

Access Lockout

The user’s access to the Operations Page can be controlled through the [`loc] parameter. The [`loc] parameter appears at the end of the Setup Page. It does not affect the Setup, Factory or Programming Pages.

[``0] All the Operations Page parameters may be viewed or changed.

[``1] The set point, process value, auto-manual selection and alarm settings are the only visible Operations Page parameters. Set point is adjustable in this level. Auto-manual selection and autotune are permitted. During manual operation, the percent power is adjustable.

[``2] The set point, process value, auto-manual selection and alarm settings are the only visible Operations Page parameters. Set point is adjustable in this level. Auto-manual selection is permitted. During manual operation, percent power is adjustable.

[``3] The set point, process value and alarm settings are the only visible Operations Page parameters. Set point is adjustable. Auto-manual selection is not permitted. During manual operation, percent power is adjustable.

[``4] The set point and process values are the only visible Operations Page parameters, set point is not adjustable. During manual operation, percent power is not adjustable.

Set Point Low Limit and High Limit

The controller constrains the set point to a value between a low limit and a high limit. The high limit cannot be set higher than the sensor high limit or lower than the low limit. The low limit cannot be set lower than the sensor low limit or higher than the high limit.

Set the set point range with Set Point Low [SP;Lo] and Set Point High [SP;hi] (Setup Page).

High Scale and Low Scale

When an analog input is selected as process voltage or process current input, you must choose the value of voltage or current to be the low and high ends. For example, when using a 4 to 20 mA input, the scale low value would be 4.00 mA and the scale high value would be 20.00 mA. Commonly used scale ranges are: 0 to 20 mA, 4 to 20 mA, 0 to 5V, 1 to 5V and 0 to 10V.

The Series SD31 allows you to create a scale range for special applications other than the standard ones listed above. Reversing of the scales from high values to low values is permitted for analog input signals that have a reversed action. For example, 50 psi = 4 mA and 10 psi = 20 mA.

Select the high and low values with Process Scale Low [Sc;lo] and Process Scale High [Sc;hi] (Setup Page).

Tem per

ture

Tem per

ture

Watlow Series SD31 ■ 51 ■ Chapter 10 Features

Unfiltered Input Signal

Time

Filtered Input Signal

Time

High Limit of selected Sensor Range

Range High Range (between High Limit of Sensor and Range Low)

Range High

Temperature

Set Point Range (must be between Range High and Range Low)

Range Low

Range Low Range (between Low Limit of Sensor and Range High)

Low Limit of selected Sensor Range

High Range and Low Range

With a process input, you must choose a value to represent the low and high ends of the current or voltage range. Choosing these values allows the controller’s display to be scaled into the actual working units of measurement. For example, the analog input from a humidity transmitter could represent 0 to 100 percent relative humidity as a process signal of 4 to 20 mA. Low scale would be set to 0 to represent 4 mA and high scale set to 100 to represent 20 mA. The indication on the display would then represent percent humidity and range from 0 to 100 percent with an input of 4 to 20 mA.

Select the high and low values with Units Scale Low [rg;Lo] and Units Scale High [rg;hi] (Setup Page).

Control Methods

Output Configuration

Each controller output can be configured as a heat output, a cool output, an alarm output or deactivated. No dependency limitations have been placed on the available combinations. The outputs can be configured in any combination. For instance, all three could be set to cool.

Analog outputs can be scaled for any desired current range between 0 and 20 mA or voltage range between 0 to 10V. The ranges can be reversed to high-to-low for reverse acting devices.

Heat and cool outputs use the set point and Operations parameters to determine the output value. All heat and cool outputs use the same set point value. Heat and cool each have their own set of control parameters. All heat outputs use the same set of heat control parameters and all cool outputs use the same set of cool output parameters.

Each alarm output has its own set of configuration parameters and set points, allowing independent operation.

Auto (closed loop) and Manual (open loop) Control

The controller has two basic modes of operation, auto mode and manual mode. Auto mode allows the controller to decide whether to perform closed loop control or to follow the settings of the Input Error Failure Mode parameter (Setup Page). The manual mode only allows open loop control. The Series SD controller is normally used in the auto mode. The manual mode is usually only used for specialty applications or for troubleshooting.

Manual mode is open loop control that allows the user to directly set the power level to the controller’s output load. No adjustments of the output power level occur based on temperature or set point in this mode.

In auto mode, the controller monitors the input to determine if closed loop control is possible. The controller checks to make certain a functioning sensor is providing a valid input signal. If a valid input signal is present, the controller will perform closed loop control. Closed loop control uses a process sensor to determine the difference between the process value and the set point. Then the controller applies power to a control output load to reduce that difference.

If a valid input signal is not present, the controller will indicate an input error message [Er;In] and then use the Input Error Failure Mode [fail] setting to determine operation. You can choose to have the controller perform a “bumpless” transfer, switch power to output a preset manual level, or turn the output power off.

Bumpless transfer will allow the controller to transfer to the manual mode using the last power value calculated in the auto mode if the process had stabilized at a ±5 percent output power level for two minutes prior to sensor failure, and that power level is less than 75 percent.

Input Error Latching [I;Err] (Setup Page) determines the controller’s response once a valid input signal returns to the controller. If latching is on [`Lat], then the controller will continue to indicate an input error until the error is cleared. To clear a latched alarm, press the Infinity Key ˆ. If latching is off [nLAt], the controller will automatically clear the input error and return to reading the temperature. If the controller was in the auto mode when the input error occurred, it will resume closed loop control. If the controller was in manual mode when the error occurred, the controller will remain in open loop control.

The Auto-Manual Control Indicator Light % is on when the controller is in the manual mode and it is off while in the auto mode. You can switch between modes if the Auto-Manual Mode [A-M] parameter is selected to appear on the Operations Page.

To transfer to manual mode from auto mode, press the Infinity Key ˆ to get to the Operations Page. Press the Down Key ¯ until [A-M] appears in the display. Press and hold the ß Key to display [Auto] for auto mode. Use the Up ¿ or Down ¯ keys to select [Man] . The manual set point value will be recalled from the last manual operation.

Watlow Series SD31 ■ 52 ■ Chapter 10 Features

Set Point

Temperature

100%

40%

Power

Actual Temperature

Output Power

Time

2 minutes

Sensor Break

Locks in Output Power

To transfer to auto mode from manual mode, press

the Infinity Key ˆ to get to the Operations Page. Press the Down Key ¯ until [A-M] appears in the display. Press and hold the ß Key to display [Man] for manual mode. Use the Up ¿ or Down ¯ keys to select [Auto] . The automatic set point value will be recalled from the last automatic operation.

Changes take effect after three seconds or immedi-

ately upon moving to the next parameter or by pressing the Infinity Key ˆ.

On-Off Control

On-off control switches the output either full on or full off, depending on the input, set point and hysteresis values. The hysteresis value indicates the amount the process value must deviate from the set point to turn on the output. Increasing the value decreases the number of times the output will cycle. Decreasing hysteresis improves controllability. With hysteresis set to 0, the process value would stay closer to the set point, but the output would switch on and off more frequently, and may result in the output “chattering.”

On-off control can

be selected with Heat Control Method [ht;m] or Cool Control Method [Cl;m] (Operations parameters).

NOTE: Input Error Failure Mode [fail] does not function in on-off control mode. The output goes off.

NOTE: In on-off control set Power Limit 1 and 2 ( [PL`1], and [PL`2] ) and Output Power Scale High 1 and 2 ([PSH1] and [PSH2] ) to 100%. Set Output Power Scale Low 1 and 2 ( [PSL1] and [PSL2] ) to 0%.

Proportional Control

Some processes need to maintain a temperature or process value closer to the set point than on-off control can provide. Proportional control provides closer control by adjusting the output when the temperature or process value is within a proportional band. When the value is in the band, the controller adjusts the output based on how close the process value is to the set point. The closer the process value is to the set point, the lower the output power. This is similar to backing off on the gas pedal of a car as you approach a stop sign. It keeps the temperature or process value from swinging as widely as it would with simple on-off control. However, when the system settles down, the temperature or process value tends to “droop” short of the set point.

With proportional control the output power level equals (set point minus process value) divided by the proportional band value.

Adjust the proportional band with Proportional Band Heat [Pb;ht] or Proportional Band Cool [Pb;Cl] (Operations parameters).

Proportional plus Integral (PI) Control

The droop caused by proportional control can be corrected by adding integral (reset) control. When the system settles down, the integral value is tuned to bring the temperature or process value closer to the set point. Integral determines the speed of the correction, but this may increase the overshoot at startup or when the set point is changed. Too much integral action will make the system unstable. Integral is cleared when the process value is outside of the proportional band.

Integral is in effect if PID Units are set to SI, and is measured in minutes per repeat. A low integral value causes a fast integrating action.

Reset is in effect if PID Units are set to U.S., and is measured in repeats per minute. A high reset value causes a fast integrating action.

Adjust the integral with Integral Heat [It;ht] or Integral Cool [It;Cl] (Operations parameters).

Adjust the reset with Reset Heat [rE;ht] or Reset Cool [rE;CL] (Operations parameters).

Watlow Series SD31 ■ 53 ■ Chapter 10 Features

Set Point

Overshoot

The heating action switches off when the process

temperature rises above the set point.

Set Point

Temperature

Process Temperature

The heating action switches on when the process temperature

The heating action

switches on at startup.

The cooling action

switches

on at startup.

Process Temperature

Temperature

The cooling action switches off when the process

temperature drops below the set point.

drops below the set point minus the hysteresis.

The cooling action switches on when

the process temperature rises above

the set point plus the hysteresis.

Set Point

Time

Hysteresis

Proportional Band

Temperature

Time

Droop

Time

Proportional plus Integral plus Derivative (PID) Control

Use derivative (rate) control to minimize the overshoot in a PI-controlled system. Derivative (rate) adjusts the output based on the rate of change in the temperature or process value. Too much derivative (rate) will make the system sluggish.

Rate action is active only when the process value is within twice the proportional value from the set point.

Adjust the derivative with Derivative Heat [dE;ht] or Derivative Cool [dE;Cl] (Operations parameters).

Adjust the rate with Rate Heat [rA;ht] or Rate Cool [rA;CL] (Operations parameters).

Dead Band

In a PID application the dead bands above and below the set point can save an application's energy and wear by maintaining process temperature within acceptable ranges. Shifting the effective cooling set point and heating set point keeps the two systems from fighting each other.

Proportional action ceases when the process value is within the dead band. Integral action continues to bring the process temperature to the set point. When the dead band value is zero, the heating element activates when the temperature drops below the set point, and the cooling element switches on when the temperature exceeds the set point.

Adjust the dead bands with Dead Band Heat [db;ht] and Dead Band Cool [db;CL] (Operations parameters).

Power limiting and power scaling

Power limiting and power scaling are two methods of placing limitations on a control output. The functions can be used independently or together. An output level calculated from the PID algorithm first has the power limit applied, then the resulting value is processed using power scaling.

→→

Using both power limiting and power scaling would not usually be necessary. Power limiting provides a basic static cap on power, while power scaling provides a more dynamic range of power limitation.

Note: When output power must be limited, in most cases power scaling will provide better autotune performance than power limiting.

NOTE: In on-off control set Power Limit 1 and 2 ( [PL`1] and [PL`2] ) and Output Power Scale High 1 and 2 ( [PSH1] and [PSH2] ) to 100%. Set Output Power Scale Low 1 and 2 ( [PSL1] and [PSL2] ) to 0%.

The power limit sets the maximum power for a heat or cool control output. Each control output has its own power limit. For heating outputs it determines the maximum level of heat power and for cool outputs it determines the maximum level of cooling power. A power limit of 100% in effect disables the power limit. If the PID calculations yield a power level that is greater than the power limit setting, then the output power level will be the power limit setting. For example, with a power limit setting of 70%, a PID-calculated power output of 50% would result in an actual output power level of 50%. But if the PID calculated power output is 100%, then the power level will be 70%.

Power scaling establishes the maximum power output and the minimum power output. The output power is then linearly scaled within that range. The default values of Output Power Scale Low of 0% and Output Power Scale High of 100% in effect disable power scaling.

Linear scaling allows the controller to do calculations over the full range of power (0 to 100%) and adjust that calculation within the actual output span. For instance, if scale low is set to 15% and scale high is set to 80%, the output power will always be between 15 and 80%. If the PID calculation is 100%, the output power will be 80%, which is the same result you would get from a power limit of 80%. However, if the PID calculation for heat is 50%, the output will be 50% of the allowable range, which scales to an actual output of 47.5%.

Power limiting and power scaling affect the specified output at all times, including in on-off control, manual mode and during autotuning.

Output Powe r scaled

Output power capped at Powe r Limit

Output power calculated using PID

Time

Temperature

Heating Set Point

Heating Proportional Band

Cooling Dead Band

Cooling Set Point

Cooling Proportional Band

Watlow Series SD31 ■ 54 ■ Chapter 10 Features

Set Point

Reduced Overshoot

Proportional Band

Proportional Band x 2

Heating Slows

Temperature

Time

The Power Limit 1and 2 ( [PL`1] and [PL`2] ) and Output Power Scale Low 1 and 2 ([PSL1] and [PSL2]) and Output Power Scale High 1 and 2 ( [PSH1] and [PSH2] ) appear on the Setup Page. The calculated PID heat and cool power values can be viewed with Power Heat [Po;ht] and Power Cool [Po;CL] parameters on the Operations Page.

Nonlinear output curve

A nonlinear output curve may improve performance when the response of the output device is nonlinear. If Output Nonlinear Function is set to curve 1 [Cru1] or curve 2 [Cru2], a PID calculation yields a lower actual output level than the linear output provides. These output curves are used in plastics extruder applications. Curve 1 is for air cooled extruders and curve 2 is for water cooled extruders.

Change the linearity for each output with Output Nonlinear Function 1 or 2 ( [nLf1] or [nlf2] ) on the Setup Page.

Independent Heat and Cool PID

In an application with one output assigned to heating and another assigned to cooling, each will have a separate set of PID parameters and separate dead bands. The heating parameters take effect when the process temperature is lower than the set point and the cooling parameters take effect when the process temperature is higher than the set point.

Adjust heat and cool PID parameters are Operations parameters.

Variable Time Base

Variable time base is the preferred method for controlling a resistive load, providing a very short time base for longer heater life. Unlike phase-angle firing, variable-time-base switching does not limit the current and voltage applied to the heater.

With variable time base outputs, the PID algorithm calculates an output between 0 and 100%, but the output is distributed in groupings of three ac line cycles. For each group of three ac line cycles, the controller decides whether the power should be on or off. There is no fixed cycle time since the decision is made for each group of cycles. When used in conjunction with a zero cross (burst fire) device, such as a solid-state power controller, switching is done only at the zero cross of the ac line, which helps reduce electrical noise (RFI).

Variable time base should be used with solid-state power controllers, such as a solid-state relay (SSR) or silicon controlled rectifier (SCR) power controller. Do not use a variable time base output for controlling electromechanical relays, mercury displacement relays, inductive loads or heaters with unusual resistance characteristics.

100

Watlow Series SD31 ■ 55 ■ Chapter 10 Features

Percent Power Output

Power Limit 100% Power Scale Low 15% Power Scale High 80%

Power Limit 70% Power Scale Low 15% Power Scale High 80%

Power Limit 100% Power Scale Low 0% Power Scale High 100%

Power Limit 70% Power Scale Low 0% Power Scale High 100%

Time ➔

100

Cooling Side Proportional Band

Set Point

Temperature

Cooling Side Dead Band

Heating Side Dead Band

Heating Side Proportional Band

Time

Linear

Actual Output Power

Curve 1

Curve 2

PID Calculation

The combination of variable time base output and a solid-state relay can inexpensively approach the effect of analog, phase-angle fired control.

You must select the AC power line frequency [ACLF], 50 or 60 Hz.

Ramping

Ramping protects materials and systems that cannot tolerate rapid temperature changes. The value of the ramp rate is the maximum degrees per minute or hour that the system temperature can change.

Select Ramping Mode [``rP] (Setup Page):

[`OFF] ramping not active. [`Str] ramp at startup. [``On] ramp at startup or when the set point

changes.

Select whether the rate is in degrees per minute or degrees per hour with Ramp Scale [rP;sc] (Setup Page). Set the ramping rate with Ramp Rate [rp;rt] (Setup Page).

Alarms

Alarms are activated when the process value or temperature leaves a defined range. A user can configure how and when an alarm is triggered, what action it takes and whether it turns off automatically when the alarm condition is over.

Configure alarm outputs on the Setup Page before setting alarm set points.

Process or Deviation Alarms

A process alarm uses one or two absolute set points to define an alarm condition.

A deviation alarm uses one or two set points that are defined relative to the control set point. High and low alarm set points are calculated by adding and/or subtracting offset values from the control set point. If the set point changes, the window defined by the alarm set points automatically changes with it.

Select the alarm type with the Setup Page parameters. View or change process or deviation set points with the Operations parameters.

Alarm Set Points

The alarm high set point defines the process value or temperature that will trigger a high side alarm. It must be higher than the alarm low set point and lower than the high limit of the sensor range.

The alarm low set point defines the temperature that will trigger a low side alarm. It must be lower than the alarm high set point and higher than the low limit of the sensor range.

View or change alarm set points with the Operations parameters.

Watlow Series SD31 ■ 56 ■ Chapter 10 Features

Set Point

Temperature

Temperature reaches Set Point quickly

Time

Set Point

degrees

Temperature

per minute

Temperature ramps to Set Point at a set rate

Time

Alarm Hysteresis

An alarm state is triggered when the process value reaches the alarm high or alarm low set point. Alarm hysteresis defines how far the process must return into the normal operating range before the alarm can be cleared.

Alarm hysteresis is a zone inside each alarm set point. This zone is defined by adding the hysteresis value to the alarm low set point or subtracting the hysteresis value from the alarm high set point.

View or change alarm hysteresis Alarm 1 or 2 Hysteresis, [hyS1] or [hyS2] (Setup Page).

Alarm Latching

A latched alarm will remain active after the alarm condition has passed. To clear a latched alarm, press the Infinity Key ˆ. It can only be deactivated by the user. An alarm that is not latched (self-clearing) will deactivate automatically when the alarm condition has passed.

Turn alarm latching on or off with Alarm

1 or 2

Latching[LAt1] or [LAt2] (Setup Page).

Alarm Silencing

Alarm silencing has two uses:

1. It is often used to allow a system to warm up after it has been started up. With alarm silencing on, an alarm is not triggered when the process temperature is initially lower than the alarm low set point. The process temperature has to enter the normal operating range beyond the hysteresis zone to activate the alarm function.

2. Alarm silencing also allows the operator to disable the alarm output while the controller is in an alarm state. The process temperature has to enter the normal operating range beyond the hysteresis zone to activate the alarm output function.

If the Series SD31 has an output that is functioning as a deviation alarm, the alarm is blocked when the set point is changed, until the process value re-enters the normal operating range.

Turn alarm silencing on or off with Alarm 1

or 2

Si-

lencing [Sil1] or [Sil2] (Setup Page).

Retransmit

The retransmit feature allows a process output to provide an analog signal that represents the set point or actual process value. The signal may serve as a remote set point for another controller or as an input for a chart recorder to document system performance over time. Any process output can be configured as a retransmit output.

Watlow Series SD31 ■ 57 ■ Chapter 10 Features

ure

empera

High Side Alarm Range

Alarm Hysteresis

Normal Operating Range

Alarm Hysteresis

Low Side Alarm Range

Time

Alarm High Set Point

Alarm Low Set Point

The alarm state begins when the temperature reaches the Alarm High Set Point

Alarm Hysteresis

Normal Operating Range

The alarm state continues until the

Temperature

Process

temperature drops to the Alarm High Set Point minus the hysteresis. A latching alarm could be turned off by the operator at this point. A nonlatching alarm would turn off automatically.

Alarm High Set Point

Alarm Low Set Point

Alarm High Set Point

Hysteresis

Normal Operating Range

Hysteresis

Alarm

triggered

here

Time

Alarm Low Set Point

Alarm

enabled

here

Temperature

Process

Temperature

Startup,

Alarm

disabled

Time

Communications

Overview

A Series SD31 controller can also be programmed and monitored by connecting it with a personal computer or programmable logic controller (PLC) via serial communications. To do this it must be equipped with an EIA/TIA 485 (SD_ _ - _ _ U_ - _ _ _ _) communications option for Output 2. Your PC or PLC must have available an EIA/TIA-485 interface or use an EIA/TIA-232 to EIA/TIA-485 converter. See “Selecting an EIA/TIA-232 to EIA/TIA-485 converter” in Chapter 2. The EIA/TIA485 option directly supports communication with up to 32 devices on a network or up to 247 devices using a 485 repeater.

Basic communications settings must first be configured on the controller on the Setup Page. Match the Baud Rate [baUd] to that of the computer and select a unique Address [Addr] for each Series SD31.

To view or change controller settings with a personal computer, you need to run software that uses the Modbus RTU protocol to read or write to registers in the controller. See the parameter tables for information about the Modbus registers. These registers contain the parameter values that determine how the controller will function and current input and output values of the system. The address in the tables have been offset by subtracting 40,001 from each one.

Two consecutive registers are addressed for 32-bit data types. The first word, or lower register number, contains the two higher bytes. The second word, or higher register number, contains the two lower bytes of the four byte integer value.

Setting Up a Modbus Network

1. Wire the controllers.

The Series SD31 uses an EIA/TIA-485 serial port, which is not typically found in a PC, but can be found on many PLC’s. The type of port found in a typical PC is an EIA-232 port. Internal EIA/TIA-485 PC ports are available, but the most common way for a PC to communicate using a EIA-485 port is with an EIA/TIA-232 to EIA/TIA-485 converter. See “Selecting an EIA/TIA-232 to EIA/TIA-485 converter” in Chapter 2.

The advantages of EIA/TIA-485 are that it is less susceptible to noise and it allows a PC or PLC to communicate with multiple controllers on the same port to form a network. It is important when using EIA/TIA485, to install the termination resistors along with pullup and pull-down resistors to ensure reliable communications.

Some newer PCs may only have a USB port. USB-toserial adapters (usually EIA/TIA 232) are available from a variety of different PC vendors. Some companies offer adapters to convert from USB to EIA/TIA-485 directly.

2. Configure each controller’s communications parameters on the Setup Menu using the front panel.

Only a couple of communications parameters need to be configured on the controller, Baud Rate and Modbus Address. The choices for Baud Rate are 9600 bps, 19200 bps or 38400 bps. 38400 baud allows for the fastest communication. For compatibility with other devices, reducing noise susceptibility, or increasing communications distance, 9600 bps could be chosen. When using EIA/TIA-485, all devices connected to that port must use the same Baud Rate. The Modbus address is used to identify each controller on the network. With EIA/TIA485, every controller on the network must have a unique address.

3. Choose a device to communicate with the controller.

The controller can communicate with devices, such as a computer running a software program, a PLC (Programmable Logic Controller) or an OIT (Operator Interface Terminal). Whichever device is chosen, it needs to be able to communicate using the Modbus RTU Protocol. OITs would need to be ordered with Modbus RTU support. PLCs would either have Modbus RTU as a standard feature or it can be made available with an I/O module. On a computer, the software package to be used would need to have the Modbus RTU capability.

4. Select a software package for the computer.

Select the software package based on what is required from the application. For basic communications (such as reading the process value or setting the set point), Watlow has the Comm7 software package. This is mainly used for diagnostics and basic communications.

The WATVIEW™ software package offers more advanced features. WATVIEW™ is available in three editions, each offering increasing levels of functionality. If you need functionality beyond WATVIEW™ or need to interface with an existing software package, many other third party software packages can interface with the Series SD31.

When purchasing a third-party software package, be sure to look for a package that is Modbus RTU compatible or has Modbus RTU drivers. Most third-party packages require you to specify the Modbus registers of the controller to setup the package.

Another option is to custom-create a software package. Using the Modbus register and data information in this user’s manual, a software package can be created and tailored to the desired application. To assist in application development, Watlow offers WATCONNECT™, which is a Windows-based software library for Modbus RTU communications. For further information on WATVIEW™ software packages, the WATCONNECT™ software library, or to download the Comm7 software, go to the Watlow web site at http://www.watlow.com.

Watlow Series SD31 ■ 58 ■ Chapter 10 Features

5. Configure the software’s communications

parameters.

A software package, (be it software for a Computer, a PLC or an OIT) will need to be configured just as the controller was configured, setting the Baud Rate and Address to match. The software package may have additional parameters to set, such as number of data bits, parity and stop bits. For Watlow controllers using modbus, these should always be set at 8 data bits, no parity, and 1 stop bit. This is often written as “8N1”. Some software packages may give the option to control the activity of the RTS, CTS and DTR lines, which are sometimes used by EIA-232 to EIA-485 converters. On packages where the Modbus registers for the controller need to be defined, these values can be entered at this time. Be sure to account for offsets.

6. Test the communications.

Once communications is configured, test the link to the controller for verification that everything is wired and configured properly. Check the wiring and configurations if things aren’t working. One misplaced wire or one incorrect setting will keep communications from working. When using an EIA-232 to EIA-485 converter, be sure to follow the configuration instructions provided with the converter, as some may require special jumper/switch settings, external power supply requirements or special signals from the software. Some software packages have built-in routines for testing the communications or use Comm6 to help diagnose problems.

7. Start communications with the controller.

With the communications successfully verified, the software is now ready for use with the controller. The above guidelines are the general steps to establishing communications with controllers using Modbus. Some applications may require other steps not mentioned, but would follow the same general process.

8. Programming and configuring the controllers.

When programming and configuring the controllers with a software program, a couple of things must be kept in mind. If the software allows changing Setup parameters such as Input Type, other parameter values that are dependent on that setting may be automatically changed. Some software packages may warn you of this possibility and others may not.

Also, some controllers require that any changes made by the software program to controller parameters that need to be retained in the controller memory must be saved in the non-volatile memory writes register. Any settings not saved to controller memory will be lost when the controller’s power is turned off.

Writing to Non-Volatile Memory

The Series SD31 stores parameter values in nonvolatile EEPROM memory. This type of memory has a finite life of approximately 100,000 write cycles. In some applications, you might need to constantly write new values to a particular register. Examples might be the writing of ramping set points or repetitive loops through serial communications. Continuous writes may result in premature controller failure and system downtime.

To prevent premature failure of the EEPROM when frequently writing register values, write a 0 to register

17. Any values written after that, will not be stored to EEPROM. However, this data is lost when power is removed. Register 17 defaults to a value of 1 after each power cycle, writing values to EEPROM again. You must write a 0 to register 17 upon power up to prevent data from being written to EEPROM.

Watlow Series SD31 ■ 59 ■ Chapter 10 Features

Watlow Series SD31 ■ 60 ■ Chapter 10 Features

Indication Probable Cause(s) Corrective Action

No power. Controller appears dead. No display indication in either

window.

Power to unit may be off. Fuse may be blown. Breaker may be tripped. Safety interlock door switch, etc. may be acti-

vated. Separate system limit control may be latched. Wiring may be open. Input power may be incorrect.

Check switches, fuses, breakers, interlocks, limit devices, connectors, etc. for energized condition and proper connection.

Measure power upstream for required level. Verify supply power requirements using the part number.

Check wire size. Check for bad connections.

Set point value not displayed

Display Default [~dsp] (Setup)

is not set to

[`Set]

. Press

key to access set point.

Verify that

[~dSP]

is at the desired setting.

Process value not displayed

Display Default [~dsp] (Setup)

is not set to

[proc]

. Press

key to access process val-

ue.

Verify that

[~dSP]

is at the desired setting.

Cannot establish serial data communications with the controller.

Address parameter may be incorrectly set. Baud rate parameter may be incorrectly set.

Unit-to-unit daisy chain may be disconnected. Communications wiring may be reversed,

shorted or open.

EIA-485 converter box may be incorrectly wired.

Computer’s COM port may be incorrectly set up.

Communications software setup or address may be incorrect.

PC software’s protocol or parity may be wrong. Parity should be 8, n, 1.

Application software is not working properly.

May need termination, pull-up and pull-down resistors.

Check Setup Page and set to correct address. Check Setup Page and set to correct baud

rate. Look for a break in the daisy chain. Verify correct connections and test wiring

paths. Check converter box wiring and its documen-

tation. Reconfigure computer’s COM port setup and

verify that communications are ok. Check the communication card documentation

for settable variables and operational testing. Restart PC software and check for settings

agreement. Verify the COM bus is active. Verify operation with Watlow communications

tool available at www.watlow.com. Add termination resistors for EIA/TIA-485

(see Install and Wire chapter).

Output signal is on when it should not be.

Output wiring is incorrect. Verify the output wiring.

Output parameters are set incorrectly. Verify the output parameter settings.

DC voltage applied to output option “K” (solidstate relay output).

Solid-state relay option can be used with alternating current (ac) voltage only.

Output signal is not on when it should be.

Output wiring is incorrect. Verify the output wiring.

For solid-state relay (option “K”) and mechani- cal relay (option “E” or “J”), power must be applied.

Verify that power is applied to the output. The output simply acts as a switch.

Output parameters are set incorrectly. Verify the output parameter settings.

Troubleshooting

Watlow Series SD31 ■ 61 ■ Chapter 10 Features

Indication Probable Cause(s) Corrective Action

Getting alarm message

[A1hi],[A2hi],[A1Lo]

,or

[A2Lo]

The process value is beyond an alarm set point.

Determine when alarms messages will display and the proper response to an alarm message.

Alarm is occurring when it should not.

Alarm settings are incorrect. Adjust the alarm settings to be correct for the

application.

Input may be in an error condition. See error messages.

Alarm may be latched.

Press the Infinity Key ˆto unlatch an alarm.

Alarm output indication is incorrect.

Alarm settings are incorrect. Adjust the alarm settings to be correct for the

application.

Alarm may be silenced. See the Features Chapter for information on

alarm silencing.

Alarm is not occurring when it should.

Alarm settings are incorrect. Adjust the alarm settings to be correct for the

application.

Output cycles (turns on and off) too frequently.

Wrong control mode. PID control selected instead of On-Off control.

The cycle time is not set properly.

Select On-Off control mode (

[ht;m] or [CL;m]

Operations Page

)

and set the desired hystere-

sis value.

Adjust the cycle time.

Controller does not control close enough to the set point.

Wrong control mode. On-Off control selected instead of PID.

PID is not tuned properly.

Select PID control and perform tuning.

Run autotune or perform manual tuning.

Controller’s process value reading is decreasing but actual process is increasing.

Thermocouple polarity is reversed. Check thermocouple connections. All thermo-

couple connections, including thermocouple extension wire, must maintain the correct polarity for proper operation.

Analog voltage or analog current input scaling is reversed or incorrect.

Check the settings of the analog output scale low and scale high parameter (Setup Page).

Parameter(s) do not appear. Parameter is not active. See Setup and Operation chapters to deter-

mine when parameters should appear.

Parameter lockout is active. Set the correct level of lockout for access (Set-

up Page).

Operations Page is not configured properly. Select the desired parameters for the Program-

ming Page.

Cannot access Operation Page. Cannot change the set point.

Parameter lockout is active. Set the correct level of lockout for access (Set-

up Page).

Watlow Series SD31 ■ 62 ■ Chapter 10 Features

Indication Probable Cause(s) Corrective Action

[Er;In]

Input error

The sensor may be improperly wired. Sensor wiring may be reversed, shorted or

open. The input may be set to the wrong sensor

or the controller may not be calibrated. Calibration may have been corrupted.

Check sensor connections. Check sensor connections and sensor

wiring. Change Sensor Type

[`Sen] (Setup Page)

match the sensor hardware. Restore factory calibration. Press the Infinity Key

to reset latched

input errors.

[Er;Ab]

Ambient temperature error

Ambient temperature may be too hot or too cold.

Calibration may be corrupted.

Verify that the temperature surrounding the controller is -18 to 65°C (0 to 149°F).

Restore factory calibration. Cycle power.

[Er;CS]

Checksum error

Settings may have changed unexpectedly.

Press the Infinity Key ˆto clear the error.

Cycle power. Verify settings. If error message persists,

contact the factory.

Error Messages

Watlow Series SD31 ■ 63 ■ Appendix

Specifications

Controller

• 1/32 DIN, microprocessor-based, user-selectable control modes

• Heat and cool autotune for control outputs

• 1 Universal input, 2 outputs

• Control outputs user-selectable as on-off, P, PI, PID

• Display update: 10 Hz, adjustable digital filter

• Output update: burst, 0.1 to 999.9 seconds

• Communication output isolated

• Displayed in °C, °F or process units

Operator Interface

• Single 4-digit LED displays

• SET, Infinity (Home), Up Arrow, Down Arrow, tactile keys

Standard Conditions For Specifications

• Ambient temperature 25°C (77°F) ±3°C, rated line voltage, 50 to 60Hz, 0 to 90% RH non-condensing, 15-minute warm-up

Universal Input

• Sampling rate: 6.5 Hz.

Thermocouple

• Type J, K, T, E, N, C (W5), D (W3), PTII (F), R, S, B thermocouple types. Whole or tenth of a degree resolution.

• >20 MΩ input impedance

• Maximum 20 Ω source resistance

RTD

• 2- or 3-wire platinum, 100 Ω

• DIN curve (.00385 curve)

• Whole or tenth degree indication

• 390 µA nominal RTD excitation currrent

Process

• Range selectable: 0 to 10VÎ (dc), 0 to 5VÎ (dc), 1 to 5VÎ (dc), 0 to 20 mA, 4 to 20 mA. (Can reverse low and high values.)

• Voltage input impedance 20 kΩ

• Current input impedance 100 Ω

• Minimum current source resistance 1 MΩ

• Input resolution 50,000 bits (approximately) at full scale

Input Accuracy Span Ranges

Thermocouple Input

• Calibration accuracy: ±0.1% of input accuracy span ±1°C at standard conditions

• Temperature stability: ±0.2 degree per degree change in ambient for J, K, T, E, N, F

±0.3% for C and D ±0.4% for B, R (excluding 0 to 100°C) and S (excluding 0 to

100°C) ±0.5% for R and S (entire input accuracy range)

RTD Input

• Calibration accuracy ±0.1% of input accuracy span ±1°C at standard conditions

• Temperature stability: ±0.05 degree per degree change in ambient

Process Input

• Voltage input ranges

Accuracy ±10mV ±1 LSD at standard conditions Temperature stability ±100 ppm/°C maximum

• Milliamp input ranges

Accuracy ±20µA ±1 LSD at standard conditions

Temperature stability ±100 ppm/°C maximum

Allowable Operating Ranges

Output Types

• Output update rate: 6.5 Hz.

Switched DC

• Supply voltage minimum: 6VÎ (dc) @ 30 mA

• Supply voltage maximum: 12VÎ (dc) into an infinite load

Solid-state Relay

• Optically isolated

• Zero cross switched

• Without contact suppression

• Minimum load current: 10 mA rms

• Maximum current: 0.5A rms at 24 to 240VÅ (ac), resistive

• 20 VA pilot duty, 120/240VÅ (ac), inductive

• Must use RC suppression for inductive loads

• Maximum offstate leakage current: 100 µA rms

Type J: 32 to 1,500°F or 0 to 816°C Type K: -328 to 2,500°F or -200 to 1,371°C Type T: -328 to 750°F or -200 to 399°C Type E: -328 to 1,470°F or -200 to 799°C Type N: 32 to 2,372°F or 0 to 1,300°C Type C (W5): 32 to 4,200°F or 0 to 2,316°C Type D (W3): 32 to 4,200°F or 0 to 2,316°C Type PTII (F): 32 to 2,543°F or 0 to 1,395°C Type R: 32 to 3,200°F or 0 to 1,760°C Type S: 32 to 3,200°F or 0 to 1,760°C Type B: 32 to 3,300°F or 0 to 1,816°C RTD (DIN) -328 to 1,472°F or -200 to 800°C Process -1,999 to 9,999 units

Appendix

Type J: 32 to 1,382°F or 0 to 750°C

Type K: -328 to 2,282°F or -200 to 1,250°C

Type T: -328 to 662°F or -200 to 350°C

Type E: -328 to 1,470°F or -200 to 799°C

Type N: 32 to 2,282°F or 0 to 1,250°C

Type C (W5): 32 to 4,200°F or 0 to 2,316°C

Type D (W3): 32 to 4,200°F or 0 to 2,316°C Type PTII (F): 32 to 2,540°F or 0 to 1,393°C

Type R: 32 to 2,642°F or 0 to 1,450°C

Type S: 32 to 2,642°F or 0 to 1,450°C

Type B: 1,598 to 3,092°F or 870 to 1,700°C

RTD: -328 to 1,472°F or -200 to 800°C

Process: -1,999 to 9,999 units

Watlow Series SD31 ■ 64 ■ Appendix

Electromechanical Relay, Form A

• Minimum load current: 10 mA

• 2 A @ 240VÅ (ac) or 30VÎ (dc) maximum, resistive

• 125 VA pilot duty, 120/240VÅ (ac), inductive

• Must use RC suppression for inductive loads

• Electrical life 100,000 cycles at rated current

Process

• Range selectable: 0 to 20 mA, 4 to 20 mA, 0 to 5VÎ (dc), 1 to 5VÎ (dc), 0 to 10VÎ (dc)

• Reverse or direct acting

• 0 to 10VÎ (dc) voltage output into 1,000 Ω minimum load resist-

ance

• 0 to 20 mA current output into 800 Ω maximum load resistance

• Resolution:

dc ranges: 2.5 mV nominal mA ranges: 5 µA nominal

• Calibration accuracy:

dc ranges: ±15 mV mA ranges: ±30 µA

• Temperature stability: 100 ppm/°C

Communications

EIA/TIA-485

• Isolated

• Modbus™ RTU protocol

• 9600, 19200 and 38400 baud rates

• A maximum of 32 units can be connected (with additional 485

repeater hardware, up to 247 units may be connected)

• Sampling rate: 20 Hz

Timer Accuracy

• ± 1 second/hour

Agency Approvals

• UL Listed Process Control UL3121® (UL 61010C-1), c-UL, CE, IP65 (NEMA 4X). File # E185611.

UL®is a registered trademark of the Underwriter’s Laboratories, Inc.

• CSA approved C22.2#24, File 158031

• NSF2 approved for type E, J, K, T, and RTD sensors. File 49660-

0002-000

Terminals

• Touch-safe

• Input power and control outputs: 0.2 to 4 mm2 (22 to 12 AWG),

6 mm (0.25 in) strip length

• Sensor inputs and process outputs: 0.1 to 0.5 mm

(28 to 20

AWG), 8 mm (0.30 in) strip length

• Solid or tinned wire recommended for spring clamp style connectors.

• Torque: terminal blocks 1 to 6 (SD _ _ - _ [C, K or J] _ _ - _ _ _ _) and 1 to 4 (SD _ _ - _ F _ _ - _ _ _ _ ) are 0.8 Nm (7 in-lb).

Power

• 100 to 240VÅ (ac) +10%; -15%; 50/60 Hz, ±5%

• 24V‡ (ac/dc) +10%; -15%; 50/60 Hz, ±5%; Class 2 power source

is required for low-voltage model.

• 10VA maximum power consumption

• Data retention upon power failure via nonvolatile memory

Operating Environment

• -18 to 65°C (0 to 149°F)

• 0 to 90% RH, non-condensing

• Storage temperature: -40 to 85°C (-40 to 185°F)

Dimensions

• Height - 29.7 mm (1.17 in) Width - 52.6 mm (2.07 in) Behind panel - 97.8 mm (3.85 in

Functionality Matrix

Note: These specifications are subject to change without prior notice.

Universal

Input

Control Alarm Process 485 Comm

Input 1

Output 1

Output 2

Watlow Series SD31 ■ 65 ■ Appendix

Ordering Information and Model Numbers

For more information, go to www.watlow.com or contact your Watlow representative.

S D 3 1 — —

Power Supply H or L

100 to 240VÅ (ac)

24V‡ (ac/dc)

Output 1 C, K, F or J

Switched DC

Solid-state Relay Form A, 0.5 Amp

Universal Process

Mechanical Relay Form A, 2 Amp

Output 2 A, C, K, J or U

None

Switched DC

Solid-state Relay Form A, 0.5 Amp

Mechanical Relay Form A, 2 Amp

EIA/TIA-485 Modbus Communications

Timer Option A or T

None

Timer

Display Color and Custom Options

Red Display, Standard Overlay withWatlow Name

Green Display, Standard Overlay withWatlow Name

Red Display, without Watlow Name

Green Display, without Watlow Name

Custom Options

AC Line Frequency 27 AC Power Wiring 6 Access Lockout 28, 51 Active Output Indicator Lights 14 Address 28, 58 Adjust the set point 15 Adjusting the set temperature 15 Advance Key 14 Agency Approvals 64 Alarm 1 High 32 Alarm 1 Hysteresis 26 Alarm 1 Latching 26 Alarm 1 Logic 26 Alarm 1 Low 32 Alarm 1 Message 26 Alarm 1 Silencing 26 Alarm 2 High 32 Alarm 2 Hysteresis 26 Alarm 2 Latching 27 Alarm 2 Logic 27 Alarm 2 Low 32 Alarm 2 Message 27 Alarm 2 Silencing 27 Alarm High 1 Status 20 Alarm High 2 Status 20 Alarm Hysteresis 57 Alarm Latching 57 Alarm Low 1 Status 20 Alarm Low 2 Status 20 Alarm Message 15 Alarm Set Points 56 Alarm Silencing 57 Alarm Features 56 Ambient Temperature 43 Ambient temperature error 62 Analog Output 1 Scale High 24 Analog Output 1 Scale Low 24 Analog Output 1 Units 24 Appendix 63 Auto and Manual Control 52 Auto (closed loop) control 52 Auto-Manual Control Indicator Light 14 Automatic Mode 15, 52 Automatic Send Data control 11 Auto-Manual Mode 29 Autotune 29 Autotuning features 49 B&B Converter 11 Back View 4 Baud Rate 28, 58 Biasing and termination 11 Calibration 43 Calibration Offset 29, 50 Checksum error 62 Closed Loop 52 Closed Loop Control Set Point 19 Closed Loop Timer Set Point 33, 41 CMC Converter 11 Communications features 58 Communications specifications 64 Connectors 4 Control Method 1 24 Control Method 2 25

Control Methods features 52 Cool Control Method 30 Cool Hysteresis 31 Countdown Time Hours 23 Countdown Time Minutes 23 Countdown Time Seconds 23 Current Process Input Calibration 47 Current Ramp Set Point 19 Cycle Time - see fixed time base Dead Band 54 Dead Band Cool 31 Dead Band Heat 30 Default Parameters 43 Delay Off 25, 26, 39 Delay On 25, 26, 39 Derivative Cool 31 Derivative Heat 30 Derivative Term 31 Deviation Alarms 56 Dimensions 4 Dimensions specifications 64 Display Default 27 Display Intensity 43 EIA 232 to 485 Converter 11 EIA/TIA-485 Communications 56, 64 EIA/TIA-485 wiring 10 EM Gateway 12 Error condition 15 Error Messages 62 Ethernet Gateway 12 Factory Page 42 Factory Page Overview 18 Features and Benefits 2 Filter Time Constant 51 Filter Value 22, 51 Filtered Process Value 19 Fixed Time Base 1 (Cycle Time) 24 Fixed Time Base 2 (Cycle Time) 25 Functionality Matrix 64 Greenlee 4 Heat Control Method 29, 53 Heat Hysteresis 30 High Range and Low Range 52 High Scale and Low Scale 51 Home Page 15, 19 Home Page Overview 15 Hours 19, 23, 32, 37 Immediate Method 37 Independent Heat and Cool PID 55 Infinity Key 14 Index 66 INFOSENSE 21, 50 INFOSENSE 1-4 21 INFOSENSE Temperature Sensing 3, 50 Input Accuracy 63 Input Accuracy Span Ranges 63 Input Calibrate, 1.0 Volt 44 Input Calibrate, 16.0 mA 45 Input Calibrate, 4.0 mA 45 Input Calibrate, 9.0 Volt 44 Input Error 15, 20, 27, 52, 62 Input Error Failure Mode 27, 52 Input Error Latching 27, 52

Input Error Power 27 Input Filter 22, 51 Input Power Wiring 6 Input ranges 63 Inputs 50 inputs and outputs 2 Install and Wire 4 Installation 5 Integral Cool 30, 53 Integral Heat 29, 53 Integral Term 31 IP65/NEMA 4X seal 4, 5 Isolation 6, 7, 9, 10, 11 Isolation Blocks 6 Keys and Displays 14 Latching Input Error 27, 52 Latching Alarm 26, 27, 57 Lockout 28, 51 Low Voltage AC Power Wiring 6 Manual (open loop) Control 19, 33, 41, 52 Manual Mode 14, 52 Maximum Recorded Ambient Temp. 43 Measured Value 19 Minimum Recorded Ambient Temp. 43 Minutes 19, 22, 25, 26, 32, 36 Modbus Device Address 27 Modbus Network 58 Modbus RTU protocol 58 Model Numbers 64 National Electric Code (NEC) 6, 7, 8, 9, 10 NEMA 4X 4, 5 Non-latching Alarm 57 Non-latching Input Error 27 Nonlinear output curve 24, 25, 55 On-Off Control 30, 52 Open Loop 19, 33, 52 Open Loop Output Power 19 Open Loop Control Set Point 33, 41 Open Loop Timer Set Point 33, 40 Operating Environment 63 Operating Ranges 63 Operations Page 16, 29, 49 Operations Page Overview 16 Operations Parameters Table 29 Operator Interface 14, 63 Ordering Information 65 Output 1, Switched DC wiring 9 Output 1 Calibrate, 1.0 Volt 45 Output 1 Calibrate, 16.0 mA 45 Output 1 Calibrate, 4.0 mA 45 Output 1 Calibrate, 9.0 Volt 45 Output 1 Function 23 Output 1, Mechanical Relay wiring 8 Output 1 Process Value 43 Output 1, Process wiring 9 Output 1, Solid-state Relay wiring 8 Output 1 Type 43 Output 2 EIA/TIA-485 wiring 10 Output 2 Function 25, 38 Output 2, Mechanical Relay wiring 9 Output 2, Solid-state Relay wiring 10 Output 2, Switched DC Wiring 10 Output 2 Type 44

Watlow Series SD31 ■ 66 ■ Appendix

Index

Output Configuration 52 Output Nonlinear Function 1 24, 55 Output Nonlinear Function 2 26, 55 Output Power Scale High 1 24, 54 Output Power Scale High 2 26, 54 Output Power Scale Low 1 24, 54 Output Power Scale Low 2 26, 54 Output Timer Function 1 25 Output Timer Function 2 26 Output Types 63 Overview 2 Paktron 8, 9, 10 PI Control 53 PID Control 54 Power Cool 29, 55 Power Limit 1 24 Power Limit 2 25 Power limiting 54 Power scaling 54 Power specifications 64 Power Type 44 Power Up Method 37 Power Wiring 6 Preset Set Point 38 Process Alarms 56 Process Decimal Places 21 Process Input, 0 to 20 mA wiring 8 Process Input, 0 to 10V wiring 7 Process Output Calibration 47 Process Scale High 22, 51 Process Scale Low 22, 51 Process Value 14, 19 Programming Page Overview 18 Prompt Index 68 Proportional Band Cool 30, 53 Proportional Band Heat 29, 53 Proportional Control 53 Proportional + Integral (PI) Control 53 Proportional + Integral + Derivative (PID)

Control 54 Proportional Term 31 Quencharc 8, 9, 10 Ramp Rate 28, 56 Ramp Scale 28, 56 Ramp Target Set Point 20 Ramping 15, 56 Ramping Home Page display 15 Ramping Mode 28, 56 Rate Cool 31, 53 Rate Heat 30, 53 Ready Band 23, 33, 36, 37, 38 Ready Band Value 38 Ready Light 14, 23, 38 Ready Light Enable 23, 38 Ready Method 37 Ready with Acknowledge Method 36, 37 Removal 5 Reset Cool 30, 53 Reset Heat 29, 53 Restore Factory Calibration 43, 46 Restore User Settings 43 Restoring Factory Calibration 47 Restoring User Settings 49 RTD Input Wiring 7 RTD Input Calibration 46 RTD, 15 ohm 44, 46

RTD, 380 ohm 44, 46 Save User Settings 43, 49 Saving and Restoring User Settings 49 Seconds 23, 26, 33, 36 Sensor Selection 51 Sensor Type 21, 51 Serial Number 1 44 Serial Number 2 44 Set Point High 51 Set Point High Limit 22, 51 Set Point Low 51 Set Point Low Limit 22, 51 Set Point Off 38 Set Point Tracking 38 Setting Up a Modbus Network 58 Setup Page 21 Setup Page Overview 17 Signal Off 25, 39 Signal On 25, 39 Signal Time Minutes 1 25, 42 Signal Time Minutes 2 26, 42 Signal Time Seconds 1 25, 42 Signal Time Seconds 2 26, 42 Software Build Number 44 Software ID 44 Software Version 44 Specifications 63 Standard Conditions For Specifications 63 Table of Contents 1 Temperature Decimal Places 21 Temperature set point 15 Temperature Units 21 Terminals 64 Thermocouple Input Wiring 7 Thermocouple Input Calibration 46 Thermocouple Linearization 21 Thermocouple, 0mV 44 Thermocouple, 32°F 44 Thermocouple, 50mV 44 Timer Enable 23, 37 Timer Set Point 23, 38, 41 Timer Start Method 23, 37 Timer indication 14 Troubleshooting 60 Two-wire capability 11 Units of Measurement 27 Units Scale High 22, 52 Units Scale Low 22, 52 Universal Input 63 Up and Down Keys 14 Variable Time Base 24, 25, 55 Voltage Process Input Calibration 46 WATCONNECT™ 58 Watlow web site 58 WATVIEW™ 2, 12, 58 Wiring

0 to 10V Process Input 7 0 to 20mA Process Input 8 EIA/TIA 232-485 Converter 11 EM Gateway 12 High Voltage AC Power Wiring 6 Low Voltage AC Power Wiring 6 Output 1 Mechanical Relay 8 Output 1 Process 9 Output 1 Solid-state Relay 8 Output 1 Switched DC 9

Output 2 EIA-485 10 Output 2 Mechanical Relay 9 Output 2 Solid-state Relay 10 Output 2 Switched DC 10 RTD Input 7 Thermocouple Input 7

Watlow Series SD31 ■ 67 ■ Appendix

[``A;4] 45, 47 [`A;16] 45, 47 [A1;hi] 20, 32 [A1;Lo] 20, 32 [A2;hi] 20, 32 [A2;Lo] 20, 32 [ACLF] 27, 56 [Ac;ti] 27, 40 [Addr] 28, 58 [A;ma] 43 [AMb] 43 [A;mn] 43 [A-m] 29, 52 [AO1;U] 24 [A;Ot1] 43 [`Aut] 29, 49 [bAud] 28, 58 [`Cal] 29, 50 [CC;SP] 41, 42 [`C-F] 21 [C;hyS] 31 [CL;m] 30, 53 [Ctr1] 24 [Ctr2] 25 [Ct;SP] 33, 41 [dB;Cl] 31, 54 [dB;ht] 30, 54 [``dE] 31 [dE;Cl] 31, 54 [dE;ht] 30, 54 [dFLt] 43 [dL;OF] 25, 39 [dL;On] 25, 39 [`dSP] 27 [dSP1] 26 [dSP2] 27 [DSPL] 43 [Er;Ab] 62 [Er;Cs] 62 [Er;In] 15, 20, 52, 62 [FAIL] 27, 52, 53 [Fact] 43 [FLtr] 22, 51 [Ftb1] 24 [Ftb2] 25 [Ft

E] 22, 51 [h;hyS] 30 hour] 19, 23, 28, 32, 37 [ht;m] 29, 53 [hyS1] 26, 57 [hyS2] 26, 57 [I;Err] 27, 52 [Imd] 23, 37 [IS;En] 21, 50 [IS;P1] 21, 50 [IS;P2] 21, 50 [IS;P3] 21, 50 [IS;P4] 21, 50 [``it] 31 [It;CL] 30, 53 [It;ht] 29, 53 [LAt1] 26, 57

[LAt2] 27, 57 [Lgc1] 26 [Lgc2] 27 [`Lin] 21 [`LOC] 15, 28, 51 [MAn] 27, 29, 52 [[Min] 19, 23, 28, 32, 37 [nLF1] 24, 55 [nLF2] 26, 55 [O1;16] 45, 47 [O1;1u] 45, 47 [O1;4A] 45, 47 [O1;9u] 45, 47 [O1;hi] 24 [O1;Lo] 24 OC;SP] 33, 41 [OPer] 16, 29 [Ot;SP] 33, 41 [O;ty1] 43 [O;ty2] 44 [Ot`1] 23 [Ot`2] 25 [P;dEC] 21 [Pb;CL] 30, 53 [Pb;ht] 29, 53 [PL`1] 24, 53, 54, 55 [PL`2] 25, 53, 54, 55 [Po;CL] 29, 55 [Po;ht] 29, 55 [PrE;s] 23, 38, 41,42 [ProP] 31 [Prog] 18, 34 [PSH1] 24, 53, 54, 55 [PSH2] 26, 53, 54, 55 [PsL1] 24, 53, 54, 55 [PSL2] 25, 53, 54, 55 [PWr] 23, 37, 44 [`r;15] 44, 46 [r;380] 44, 46 [rA;Cl] 31, 54 [rA;ht] 30, 54

[`rdy] 23, 38 [rdy;L] 23, 38

[re;Cl] 30, 53 [rE;ht] 26, 41 [rESt] 43, 46, 47 [rg;hi] 22, 52 [rg;Lo] 22, 52 [``rP] 15, 19, 27, 56 [rP;rt] 28, 56 [rP;Sc] 28, 56 [rP;tg] 15, 20 [S;bLd] 44 [S;deC] 21 [Sc;hi] 22, 51 [Sc;Lo] 22, 51 [~Sec] 37 [`SEn] 21, 51, 62 [Sg;OF] 39 [Sg;On] 39 [`S;iD] 44 [SiL1] 26, 57

[SiL2] 27, 57 [S;M1] 25, 40 [S;M2] 26, 40

[`Sn-] 44 [`Sn_] 44 [sP;hi] 22, 51 [SP;Lo] 22, 51

[`S;S1] 25 [`S;S2] 26

[S;Uer] 44 [``tc] 21 [tc;00] 44, 46 [tc;32] 44, 46 [tc;50] 44, 46

[ti;Ac] 27, 40 [ti;En] 23, 37

[ti;F1] 24, 39 [ti;F2] 26, 39 [tim] 23, 25 [ti;SP] 23, 27, 38, 40, 41 [ti;St] 23, 37

[to;tt] 27, 40 [``U;1] 44, 46 [``U;9] 44, 46 [Unit] 27, 50 [Usr;r] 43, 49 [USr;S] 43, 49

Watlow Series SD31 ■ 68 ■ Appendix

Prompt Index

Series SD

Watlow Winona, Inc.

1241 Bundy Blvd. Winona, MN 55987 USA

Declares that the following product:

Declaration of Conformity

Designation: Model Numbers: SD(3, 4, 6, 8 or 9)(Any letter or number) – (H or L)(C, F, J or K)(A, C, J,

Classification: Temperature control, Installation Category II, Pollution degree 2 Rated Voltage and Frequency: Rated Power Consumption: 10 VA maximum

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

Series SD

K or U) (A, C, E, F or K) – (A, D or R)(any three letters or numbers)

100 to 240 V~ (ac 50/60 Hz) or 24 to 28 V (ac 50/60 Hz or dc)

89/336/EEC Electromagnetic Compatibility Directive

EN 61326 1997 With A1:1998

A2:2002

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

EN 61000-3-2 2000 ED.2. Harmonic Current Emissions EN 61000-3-3 1995 With A1:1998 Voltage Fluctuations and Flicker

Electrical equipment for measurement, control and laboratory use – EMC requirements (Industrial Immunity, Class B Emissions).

Immunity

73/23/EEC Low-Voltage Directive

EN 61010-1 2001 Safety Requirements of electrical equipment for mea-

surement, control and laboratory use. Part 1: General requirements

Raymond D. Feller III Winona, Minnesota, USA Name of Authorized Representative Place of Issue

General Manager May 2005 Title of Authorized Representative Date of Issue

Signature of Authorized Representative

How to Reach Us

Corporate Headquarters in the U.S.:

Watlow Electric Manufacturing Co. 12001 Lackland Road St. Louis, Missouri, USA 63146 Telephone: +1 (314) 878-4600 Fax: +1 (314) 878-6814

Europe:

Watlow GmbH Industriegebiet Heidig Lauchwasenstr. 1, Postfach 1165 Kronau 76709 Germany Telephone: +49 (0) 7253-9400 0 Fax: +49 (0) 7253-9400-44

Watlow France S.A.R.L. Immeuble Somag,16 Rue 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. 3rd F. Taehong Bldg. 20-6, Seocho-gu Yangjae-dong Seoul, Korea 137-130 Telephone: +82 (2) 575-9804 Fax: +82 (2) 575-9831

Watlow Malaysia Sdn Bhd 38B Jalan Tun Dr Awang 11900 Bayan Lepas Penang Malaysia Telephone: +60 (4) 641-5977 Fax: +60 (4) 641-5979

Watlow Singapore Pte. Ltd. Ayer Rajah Crescent #03-23, Ayer Rajah Industrial Estate Singapore 139949 Telephone: +65 773 9488 Fax: +65 778 0323

Watlow Electric Taiwan 10F-1 No. 189 Chi-Shen 2nd Road, Kaohsiung, Taiwan Telephone: +886 (7) 288-5168 Fax: +886 (7) 288-5568

Your Authorized Watlow Distributor:

TOTAL

CUSTOMER

SATISFACTION

3 Year Warranty

Watlow SD31 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual