Watlow 920 User Manual

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Page 1

Series 920

Microprocessor-Based

Ramping Control

User’s Manual

Watlow

Controls, 1241 Bundy Blvd., Winona, MN 55987, Phone:

W920-MA60-9302 January, 1993

Supersedes:

W920-MC5A-8944

507/454-5300,

Made in the U.S.A.

Printed

Fax:

507-452-4507

$10.00

Recycled

Paper

Page 2

First...

This manual will

tion is a good way to become familiar with the Series 920. Here’s an overview:

make

your

job

easier.

Reading it and applying the

informa-

Starting Front Panel

Running a Program lnstall/Wire

Tune

Programming

Alarms Appendix

Quick Reference

Out

Introduction, Chapter 1. Keys and Displays, Chapter 2.

Sample Program, Chapter 3.

Installation and Wiring, Chapter 4.

How to Tune, Chapter 5. How to Program, Chapter 6.

How to Use Alarms, Chapter 7.

Specifications Glossary Calibration Warranty

Series 920 error codes and prompts, inside and outside back covers.

Notes

The user’s manual contains informational notes to alert you to important details. When you see a note

icon,

look for an explanation in the margin.

or fl NOTE:

Details of a

appear here, in the

narrow box on the outside of each page.

Details of a “Caution”

appear here, in the

narrow box on the outside of each page.

Details of a “Warning” appear here, in the narrow box on the

outside of each page.

“Note”

CAUTION:

WARNING:

WATLOW

Series 920

Safety Information

Boldface safety information protects both you and your equipment.

them. Here are explanations:

The CAUTION symbol (exclamation point) in the wide text column alerts you to a

TION”,

a safety or functional hazard which could affect your

A full explanation is in the narrow column on the outside of the page.

equipment

Please be attentive to

‘CAU-

or its performance.

The WARNING symbol (lightning bolt) in the wide text column alerts you to a ‘WARNING”,

A full explanation is in the

P.0. Box

5580,

Winona,

Techni-

MN 55987-5580,

are

bir

0193

a safety hazard which could affect you and the equipment.

narrow

column

on the outside of the page.

Your comments or suggestions on this manual are welcome, please send them to: cal Writer,

or phone

User's

Watlow

507/454-5300.

Manual

Controls, 1241 Bundy Blvd.,

The Watlow Series 920 User’s Manual and integral software

Page 3

Page

Item

7 7 8 8

10 10

11 11

12 13 13

14 14

15 15 16 16 17 17 18

I8 19 19

Starting out with the Watlow Series 920 - Chapter 1

General Description Packing List

Put Your Control to Work-Three Steps How to Open the 920 How to Set the DIP Switches

Changing the Position of a DIP Switch Overview of the Three Operating Modes Where To Go From Here

How to Use the Keys and Displays - Chapter 2

Display, Key and LED-Location and Explanation Front Panel Information

Actual and Alphanumeric Display Area

Keyboard Area Where To Go From Here

Learning the Series 920

A Brief

Overview

Chapter 3

Clear Memory, Set DIP Switches Enter Real Time of Day

Before Entering Your Program Programming File 1 Running Your Program Editing Your Program

Adding an

LIN

King Files

The

AUTOSTART

WAITFOR

Step Type

Step Running Your Series 920 Where To Go From Here

Starting Out

Front Panel

Sample Program

20 20 21 22 22 22 24 24

25 26 27 27 28 30 32

Contents

How to Install and Wire the Series 920 - Chapter 4 Sensor Installation Guidelines

Input Power Wiring

The Do’s and

Don’ts

of Clean Input Power How to Check for Ground Loops Noise Suppression Devices Available from Watlow Line Filtering Configurations For Controls Installation Information

Installation Procedure How to Wire the Series 920 Power Wiring

Input Wiring Auxiliary Output Wiring Output 1 Wiring Output 2 Wiring

System Wiring Example

Install and Wire

WATLOW Series 920 User’s Manual

Page 4

Page

Item

Tuning

Programming

Alarms

33 33 33

34 35 35

36 37 37 38 39 40 42 49

54 54

54 55 56 57 58 58

How to Tune the Series 920 - Chapter

Recommended Tuning Reference Using a Chart Recorder Load

LEDs Tuning The LOPWR and

HIPWR

Parameters

Where To Go From Here

to Program the Series 920 - Chapter

Write Out Your Program

Programming in General Select the Proper DIP Switch Settings

Event Ouputs Guaranteed Soak The Four

JUMPLOOP

Types Rules to Follow SYSTEM Menu SETUP Menu PROGRAM Menu

How to Use the Series 920 Alarms - Chapter

Alarm

Relay Configuration Number of Alarms Alarm Types The Operating Band Alarm

Limits

Alarm

Function, Latching or Non-Latching Clearing an Alarm Message An Alarm And The State Of The Alarm Relay

Appendix

Terminology

Quick Reference

WATLOW Series 920 User’s

59 59

60 62 63 64 66 67 75

77 77 77 78 80

Appendix Specifications

Model Number Information

J, K, & T Thermocouple Field Calibration Procedure

R, S, &

B Thermocouple Field Calibration Procedure RTD Field Calibration Procedure Process Field Calibration Procedure Glossary Index

Warranty

Returning Merchandise Shipping Claims Series 920 Error Codes/Alarms Series 920 Quick Reference

Manual

Contents

Page 5

Figures, Tables and Charts

Page

6 8 9

10 12 12 13

19 23 23 23

25 26 27 27

30 30

37 40 42 49

Item Series 920 Input and Output Overview How to Open the Series

920 DIP Switch Location and Orientation Overview

of the Three Operating Modes Series 920 Front Panel Information Actual and Alphanumeric Display Front Panel Information Keyboard Front Panel Information

RUN Key Flow Diagram Differential Mode Filter Diagram

Common Mode Filter Diagram Combination Differential-common Mode Filter Diagram Series 920 Faceplate Dimensions Series 920 Dimensions (side view) Series 920 Panel Cutout Dimensions Series 920 Power Wiring

Input Options Wiring Diagram Auxiliary Wiring Diagram Output 1, S.S. Relay, Wiring Diagram Output 1, S.S. Switch, Wiring Diagram Output 1, Output 1,

Output

Mech.

Relay, Wiring Diagram

Triac,

Wiring Diagram

1,4-20mA,

Wiring Diagram

No Output 2 Output 2, S.S. Relay, Wiring Diagram Output 2, S.S. Switch, Wiring Diagram Output 2,

Mech. Relay,

Wiring Diagram

System Wiring Example Guaranteed Soak (GS) Example

SYSTEM Key Flow SETUP Key Flow

PROGRAM Key Flow Alarm Type for

Alarm 1

is “process” alarm Alarm Type for Alarm 1 is a “deviation” alarm Alarm limits for Alarms 1 and 2 with “process” type alarm Alarm limits for Alarms 1 and 2 with “deviation” type alarm J, K, T Reference Compensator to 920 Connection Diagram “R"

Reference Compensator to 920 Connection Diagram Decade Resistance Box to Series 920 Connection Diagram Voltage/Current Source to Series 920 Connection Diagram

Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14

Figure 15

Figure 16

Figure 17 Figure 18 Figure 19 Figure 20 Figure 21 Figure 22 Figure 23 Figure

Figure 25

Figure 26 Figure 27 Figure 28 Figure 29 Figure 30 Figure 31 Figure 32 Figure 33 Figure 34 Figure 35 Figure 36 Figure 37 Figure 38 Figure 39

16 17 17

18 18 22

41 43

50 56 65

Contents

DIP Switch Selection

Series 920 Ramp and Soak Program

Editing Your Program, Steps 4-7

Adding the AUTOSTART Step

LlNKing

The

to Another File

WAITFOR

Step Noise Suppression Device Ratings SYSTEM Prompts and Description SETUP Prompts and Description

Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9

PROGRAM Prompts and Description Table 10

Operating Band Limits and Ranges

RTD Calibration Settings for

JIS

Master Step Chart

Table 11 Table 12

Chart 1

WATLOW Series

920

User’s

Manual

Page 6

Figure Series

output

920 Input

Overview

Selectab RTD,

T/C

Process

and

Chapter 1 Starting out with the

Watlow Series 920:

A Microprocessor-Based Control

Dual

PID

ON/OFF

outputs

Two Auxiliary Outputs

RS-422A

Optional Computer Interface

RS-423A (RS-232C

Compatible)

General Description

Congratulations, you’re about to become a fully-qualified user of the Watlow Series simple to learn. A ramp progresses from one set point to another set point over a period of time. 920 and its operation.

Figure 1 is a simplified view of the Series microprocessor-based, 1/4 DIN-sized ramping temperature control. The 920 accepts a single, front panel-selectable input. This includes Type

or B thermocouple input, a 1° or 0.1°

has a full control temperature range, offset calibration, and a front panel lock-out feature.

WATLOW Series 920

User’s

920!

This versatile microprocessor-based ramping control is powerful, yet

In this chapter of the user’s manual, you’ll get an overview of the

920’s

capabilities. It is a dual output,

K, T, R, S,

RTD

input, or one of two process inputs. It

Starting

Out,

Chapter

Manual

Page 7

The Series 920 is a

PID

controller. You may input two complete sets of

PID parameters on the front panel for heat/cool applications. This includes rate, reset, proportional band and cycle time. By setting the proportional band(s) to zero, the Series 920 becomes a simple

ON/OFFcontrol

with a

3°F

1.7°C

switching differential. The 920s auxiliary outputs may be alarms or events. An event is an ON/OFF

auxiliary output relay signal. You can use events, based on time, temperature,

or other process variables, to trigger peripheral equipment or processes. Operator-friendly features include automatic entry codes or “prompts” to aid in

setup. When there’s a power outage, the Watlow Series 920 stores all information in a non-volatile memory.

When you first apply power, the unit will “come up” with default values for set points, alarm points and control

parameter.

These default values provide

minimum operating information for the control until you program in the desired

data. The default values are listed in the Master Step Menus and Charts,

pp.

41-50.

Remove the Series 920 carefully from its shipping container. Be sure to set this literature aside where it will not be discarded.

Packing List

Included with your Watlow Series 920 are two mounting brackets with integral

screws, and this manual.

If your unit has communications, the “How to Use

Data Communications with the Watlow Series 922” manual is also included.

Put Your Control to Work-Three Steps

Once your control is installed and wired, getting the Series 920 “up and run-

ning” is a three-part process:

First, match the control’s “personality”, to your system in what we call the SETUP menu; input type, units of measure, range, calibration offset, output action, alarm type, lock-out.

Second, tune the control making final

Third, enter up to ten separate profiles in the PROGRAM menu.

PID

entries.

WATLOW Series 920 User’s Manual

Page 8

How to Open the 920

The front panel screw turns only. Do not apply excessive force or turn the screw more than

CAUTION:

90°

90°.

Before going further, open the Series

case. Here’s how: The control chassis fastens to the case with a single screw located on the

lower front panel. See Figure

Three or four strip connector

power and signals through the back of the casing to the triple terminal strip.

These plugs will let go as you pull.

When removing the Series When returning the control to the case, be sure you have the top up to match the plugs with the case. The 920 will not fit in to the case upside down. Always check to see that it is oriented correctly. the front panel screw clockwise to secure it.

plugs, in the rear of

920

control from its case, pull firmly but gently.

920

and pull the control chassis from its

Turn the screw counterclockwise to loosen it.

the control chassis, feed

Press the unit in firmly, then turn

Figure 2 How to Open the Series 920.

How to Set the DIP Switches

The Watlow Series 920 has a Dual In-line Package (DIP) switch inside the control on circuit board

appear in Figure 3. The switches are clearly numbered from left to right. You will use DIP switches #1 and 3 - 8; #2 is not used. Table 1 on the next page shows the DIP switch selections.

AOO7-1699.

The locations of the board and switch

WATLOW Series 920 User’s Manual

Starting Out Chapter 1

Page 9

Figure 3 DIP Switch Location and

Orientation.

DIP

SW#

2 3

7 8

Cold Start Not Used Tenths of units displayed 0-5VDC/0-20mA

Primary output is LEDs

are load indicators Selected SPCLFUNC promts Factory Test/Calibrate

DIP switch #1 determines a warm or cold start. A grammed information in the 920s memory back-up protection. A “cold” start is a “clean” startup condition; all user-programmed information is lost. The Series 920 leaves the factory programmed for a warm start.

DIP switch #2 is not used. DIP switch #3 determines if the decimal point is displayed in tenths of units for

process inputs.

DIP switch #4 is for DIP switch #5 is for units with

set switch #5 ON for the Primary output.

DIP switch #6 determines the function of the front panel actual display. When ON, these or system troubleshooting, see Page 12 and 33.

DIP switch #7 is OFF, all SPCLFUNC prompts are displayed, when ON, factory selected prompts appear. See Page 42. DIP switch #8 is a factory calibrate switch.

Function

input

4-20mA

0-5VDC/0-20mA

4-20mA

LEDs

Normal Operating

OFF

Warm Start

Not Used No decimal displayed l-5VDC/4-20mA

Primary output is not 4-20

LEDs

are °F or All SPCLFUNC prompts Normal

input or

output.

can be used as a diagnostic tool for tuning

Operation

l-5VDC/4-20mA

input

°C

“warm”

If your unit has

LEDs

Position

OFF

OFF Choose Choose Model # Choose Choose OFF

start saves all pro-

input selection.

4-20mA

to the right of the

Dep,

output,

only

test/

Changing the Position of a Switch

Whenever you change the position of a DIP switch, follow this procedure:

Remove power from the 920. Turn the front panel screw

Grip the front panel bezel and pull it straight out from the control case. The control chassis will come out of the case as you pull the bezel.

90°counterclockwise.

Table 1

DIP Switch

Selection.

For units with

process input only.

If have process input, DIP Switch #3 should be in the OFF position.

Dokg

will cause all setup

parameters and files to be lost. DO NOT put DIP switch #1 in the ON position unless all programmed information is to be cleared.

NOTE:

your unit does not

WARNING:

a cold start

user-

Set the DIP switch to the position you want.

Return the control chassis to the case. Be sure you have it oriented correctly. It will not fit in upside down, but check just the same. Press

firmly, but gently, to seat the chassis.

Secure the front

Starting

Out,

Chapter 1

panel

screw and re-apply power to the 920.

WATLOW Series 920

User’s Manual

Page 10

Overview of the Three Operating Modes

Operating

Before getting into the details of the Series 920s keys and displays, take a look at Figure 4 showing the three different modes. After you feel comfortable with the names of the modes and their functions, go ahead to learn the keys and

displays.

Figure

Overview of the Series 920

perating

Series 920: Three Mode Types

Manually Control outputs

Enter

Program Steps & View

Program

Set Up

Your

System

SYSTEM

PROGRAM

SETUP

SYSTEM

Generates a

ramping set point

(fixed), and can manipulate events, clear alarms and error codes.

Mode

non-

PROGRAM Mode

Enter or view step type,

program loops, wait for...

points, auxiliary

(event) outputs ON/OFF,

and step duration.

conditions,

set

SETUP Mode

Set up or change system-operating parameters such as real time, high/low range, alarm points, settings, RS-422 address.

alarm

types,

PID

10 WATLOW

Where To Go From Here:..

You are now ready to find out more about the Series 920s keys and displays.

Continue to Chapter 2.

Series

920 User’s Manual

Page 11

Chapter

How to Use the Keys and Displays

This chapter will show you the Series 920 front panel, and the function of each display, key and LED. Figures 6

Display, Key and LED-Location and Explanation

The

Watlow

ACTUAL display at the top of the unit, and the smaller alphanumeric display

below. You set up the Series 920s characteristics in the alphanumeric display

window. On the right of the ACTUAL display there is a red OF LED and a red

°C

LED, indicating the temperature scale ACTUAL is displaying. If neither of these Units

The 920 has five touch-membrane keys along the bottom edge of the front

panel: (from left to right) a MODE key, an UP key, a DOWN key, an ENTER key, and a RUN/HOLD key.

Series 920 Ramping Control has two main displays, the process

LEDs

are showing, the ACTUAL display is showing Process Variable

(PVU’s).

and 7

explain the 920 front panel.

The MODE key steps the processor through the entry prompts. The UP and DOWN keys increase and decrease or change values in the

alphanumeric display. A single touch to either of these keys will change the least significant digit by one. Continuous pressure will change the value in the alphanumeric display at an increased rate. The ENTER key places the value, in the alphanumeric display, into the processor’s memory.

An alphanumeric display value will flash (when changed with the UP or DOWN keys) until you press ENTER, placing the value in the processor

The RUN/HOLD key will execute or halt a program.

memory.

Front Panel Information

Use Figures 6 and 7 to assist you in learning the locations and functions of the

front panel components.

How

to Use Keys and Displays, Chapter 2

WATLOW Series 920

User’s

Manual

Page 12

Use the following figures to learn the nature and function of the Series 920s

keys and displays.

Figure 5 Series 920 Front Panel Information.

ACTUAL Display

Shows the actual value of the process variable up to four digits.

Figure 6 Actual and Alphanumeric

Display Front Panel lnformation.

Actual and Alphanumeric Display Area

°F

LED When DIP switch #6 is OFF, it indicates the value

in the ACTUAL display is

temperature in degrees

Fahrenheit. When DIP switch #6 is ON, it indicates Output 1 is energized.

When DIP switch #6 is OFF, both °F and

LEDs is displaying Process

Variable Units

°C

LED

When DIP switch #6 is

OFF, it indicates the value

in the ACTUAL display is

Alphanumeric Display

Shows entry prompts and the parameter values in alphanumerics.

temperature in degrees

Celsius. When DIP switch

is ON, this LED indicates

Output 2 is energized.

°C

are OFF. The 920

(PVUs).

WATLOW Series 920

User's

Manual

How to Use Keys

and

Displays, Chapter

Page 13

Keyboard Area

MODE Key

This key steps the Series 920 in sequence

DOWN Key

Acts opposite the UP key. Decreases the value in the alphanumeric display. A light touch decreases the value by one digit. Hold the key down to

decrease the displayed value at a rapid rate.

Figure 7 Keyboard Panel Information.

Front

RUN/HOLD Key

Executes or holds a program from the SYSTEM menu.

Run/Hold

When the HOLD LED is

ON steady, the 920 is in a HOLD condition. When the HOLD LED flashes, the unit is

holding for a Increases the value in the alphanumeric display. A light

touch increases the value by one digit.

Hold the key down

to increase the

displayed value at a rapid rate.

90°

Front Panel Screw

Secures the control chassis in its case with a

1/4

turn clockwise or

releases the chassis with a

1/4

turn counter-

clockwise.

ENTER Key

Enters selected (flashing) data into the microprocessor memory, or will mask an error code or latched alarm for

minute.

condition, or a guaranteed soak condition. When the RUN LED is ON the 920 is in the RUN condition.

Where To Go From Here

Now that you have a good idea where everything is on the faceplate of the Series 920, continue to Chapter 3 for the Sample Program. If you skip the sample program, do not forget to check the position of DIP switch #1 before you begin programming your control after installation. With DIP switch #1 OFF, the 920 saves your program whenever power is removed (warm start). With DIP switch #1 ON, the 920 will clear its memory of all programmed information whenever power is removed, substituting default values (cold start).

How to Use Keys and Displays, Chapter

WATLOW Series 920 User’s Manual

LEDs

WAITFOR

Page 14

Chapter

WARNING:

Doing a cold start will cause all setup parameters and files to be lost. DO NOT put DIP switch #1 in the ON position

unless all

programmed information is to be cleared.

user-

Learning

the Series 920

A Sample Program in Action

This chapter can quickly grasp the necessary terms and concepts by entering and exercise.

If you feel that your

program to learn the Series 920, skip this chapter.

A Brief Overview

This sample program wilt teach you the fundamentals of creating a ramping profile, along with ways to expand that profile to its greatest versatility.

The program example will start with a simple ramp and soak profile. A ramp progresses from one set point to another set point over a period of time, or ramp rate, expressed in degrees/time. Soaking then controls the length of time the temperature

is held at this level.

We will, then expand it to form an AUTOSTART, LINK to another profile, and finally perform a

At this point make copies of your Master Step Chart on Page 53. to keep track of your program as you go.

exactly what you want your program to do.

will

guide you through an easy sample program for the Series 920. You

knowledge

multiple

observing

of profiling controllers does not require a sample

ramp and soaks, add

It is also a good idea to sit down and define

JUMPLOOP

functions, per-

It is a good practice

WAITFOR

this

step.

WATLOW

Enter Real Time of Day

First, set the Series 920s “real time-of-day, key is used to progress through the menus. The UP/DOWN keys are used to select parameters and values, and remain flashing until you press the ENTER key.

Press the MODE key until the SETUP menu appears. Press the ENTER key.

At ACCESS, enter (0) with the UP/DOWN keys; press ENTER. This is your

Series

calibration

Press the MODE key until HOUR appears in the alphanumeric display and press ENTER. Note that hours are in a 24 hour format.

920 User’s

Manual

(CALIB)

menu.

24-hour

clock.” Remember the MODE

Sample

Program, Chapter

Page 15

Use the UP/DOWN keys to place hours into the display. The display will flash until you press ENTER.

Press MODE to continue to the rect value for minutes and press ENTER.

Press the MODE key several times to return to the top of the ACCESS (0) menu.

At the top of the ACCESS (0), which is the

Time (Tl) displayed.

Continue to press MODE until SYSTEM.

Before Entering Your Program

Before we begin to program your Series parameters to enter. Verify that DIP switch #7 is OFF. If you have not tried any programming since your cold start, the C/F/U (Celsius/Fahrenheit/Units) and GS

(Guaranteed Soak) parameters are set to their appropriate values.

sary for a more detailed definition.

parameters and entering values, it might be a to see that the values are correct.

Press the MODE key until SETUP appears. Press ENTER. Once again you see the ACCESS parameter. Use the UP/DOWN keys to enter (5) and press ENTER; this is the Special Function (SPCLFUNC) menu.

MIN

parameter and press ENTER.

CALIB

menu, you

you

reach RETURN. Press ENTER to return to

Enter the cor-

will

see the Real

920,

there are a few other initial SETUP

Refer to the glos-

If you have already tried stepping through the

good

idea to go back and double check

NOTE:

When either the hours or minutes are entered, seconds are set to 0.

DIP switch #7 must

be OFF to access all SPCLFUNC ters.

internal

NOTE:

parame-

Press MODE again until you see the C/F/U parameter. This parameter will defautt

to F. Use the UP/DOWN keys to enter degrees F (Fahrenheit). Press ENTER..

Continue through the SPCLFUNC menu Enter a value of (0); press ENTER. This parameter has a default of 0.

Press the MODE key to move to the RETURN parameter. Press ENTER to return

to SYSTEM.

Good job! You have completed the initial setup, and are ready to program the 920.

Programming. File

Our first step in programming will be to make a short ramp and soak program. Step

initializes the set point to a known starting point for the ramp, Step 2 is a short ramp, Step 3 is a soak step, which holds the programmed set point constant for the pro-

grammed time.

From the SYSTEM menu, press MODE until you see the PROGRAM menu. Press ENTER.

The Series 920 asks you for a FILE?. Your 920 should already say (I), but if you

have entered any values, it may be different. Make sure it says (1). Press ENTER.

Step 4 will be a STOP step which signals the end of a file.

until you see GS

(Guaranteed Soak).

Press the MODE key and you are asked for a STEP. ENTER (1) if it is not already

there.

Sample Program, Chapter 3

WATLOW Series 920 User’s Manual

Page 16

Press the MODE key. Use the UP/DOWN keys to select the step type and

4. values.

Use Table 2 to enter the corresponding parameters and values. The parameters

5. appear from progress through the menus. After the step # is selected, use the UP/DOWN keys to select a step type. Press ENTER. Use the UP/DOWN keys to select parameters and values, they remain flashing until you press the ENTER key.

At the end of each menu, rather than pressing ENTER to go back to SYSTEM, press

MODE for the STEP prompt. The 920 automatically increments to the next step number, with the step number flashing. Press ENTER.

left

to right on the table.

Remember that the MODE key is used to

Table 2 Series 920 Ramp and Soak Program.

Step 4 must be

entered

even though it defaults to a STOP step.

NOTE:

as a step

125

Running Your Program

Return to SYSTEM using the ENTER key at the RETURN prompt.

RUN/HOLD key.

Press

the

The Series 920 now asks you what not already entered.

Press the MODE

3. Again, press (1) if it is not already there, and press ENTER.

The Series 920

LED is now lit. After each step is completed, the next step that the Series 920 performs will appear.

You may step through the parameters to see what the step-type is and what the parameters are set at. The Time Remaining is also displayed at the end of the menu. Once the Time Remaining reaches 00:00:00, it will show you what step it has progressed to. Refer to the Run menu on Page

WATLOW Series 920 User's Manual

quickly

FlLE?

you would like to run. Enter (1) if it is

key. The 920 asks you what step you would like to start on.

shows you the SP (Set Point) and jumps to Step 1. The

19.

Sample Program, Chapter 3

RUN

Page 17

Editing Your Program

Let’s try editing the program by expanding it with another ramp and soak step and adding a jump loop. We’ll jump to Step 1 and repeat Steps 1 - 6 two more times. This is accomplished by programming a Jump Step (JS) = 1 and Jump Count (JC) = 2. When your 920 goes through the program and reaches Step 6, it jumps back to Step and repeats the program two more times.

By this time you should understand the basic concept of the Series 920 and be able to

get around on your own. Remember that the MODE key takes you through the menus.

Use the UP/DOWN keys to select parameters and values, and press ENTER.

Return to the PROGRAM menu.

Enter FILE?

step to a

(1),

Step (4). We are going to change this step type from a STOP

SETPOINT

step. This will be our second ramp. Use Table 3 to enter

values into the corresponding parameters.

Once you have edited your program, run it again and watch its progress.

Table 3 Editing

Program,

Steps 4-7.

Your

Adding an AUTOSTART Step Type

The Series 920 can also automatically start your program, or a step, on a specified day and time. When you use AUTOSTART, it stops your program, and waits for the day and time you entered under the AUTOSTART step type. The Series 920 then executes the next sequential step. AUTOSTART allows you to wait up to seven days in the future; day 0 is always the current day.

1 every time the Real Time clock goes from 2359 to

DAY, and the Real Time clock is greater than the programmed AUTOSTART time, the AUTOSTART waits 6 days along with the programmed time. If day is left blank, the program begins each day at the real time programmed, regardless of the day.

Go to the PROGRAM menu.

Edit Step 7 from a STOP step to an AUTOSTART step. Follow the table below for input values. This step will wait for approximately five minutes in the future.

The

days accumulated increases by

0O:OO.

If 0 is programmed for

FILE

1 1

STEP#

STEP TYPE DAY

AUTOSTART 0 STOP

HOUR

Current Hours

MIN

Current Minutes +

Run this file starting at Step 7 and observe. The Series 920 will now wait until the real time of day matches the programmed value.

Sample Program, Chapter 3

WATLOW Series 920 User’s Manual

Table 4 Adding the AUTOSTART Step.

Page 18

LlNKing

Files

Table 5

LlNKing

Another File.

The Series 920 enables you to link

files

together. The LINK step allows you to link the

last step of a profile to the first step of another profile. Lets edit the program again by adding a LINK step at the end of the profile. But first,

lets create another file. you’ll receive

ER2

If you run your program with a LINK going to a

non-existing

file,

0036, the “no file found“ error. Follow Table 5 to add a LINK and a

new FILE to your program.

FILE? STEP STEP SP HOUR

TYPE

5 5 2

5. 3

5 4

8 1

--_-

LINK .._ SETPOINT SETPOINT SETPOINT SETPOINT SETPOINT STOP

_I75

175 0 100 0 100 0 75 0

----_

&___-._.

MIN

SEC

. 0 1

0 0

50.. 20

15 10

EVl

EV2 FILE?

ON ON

ON ON ON OFF ON OFF

OFF OFF

..~--

Run your program again beginning at FILE 1, STEP 8. Step through the menu to see the step type you’re on, and time remaining. See what happens at the end of File

Table 6 The

WAITFOR

Step.

WATLOW Series 920 User’s

The

WAITFOR

FILE STEP

The last step type we will work with is the

Step

5 6

5 7

STEP

NPE

WAITFOR

STOP

WPV

WHR

WAITFOR

step. This is a test step.

WMN

It compares a specified temperature with the process temperature, before continuing the program.

It also waits for programmed time to elapse before continuing with the pro-

gram. After the test is successful, the program continues to the next sequential step.

Return to PROGRAM and enter FILE? (5). Add a

WHR and WMN are unprogrammed. To program a for WHR and WMN. The programmed WAITFOR taneously. Once a

process variable (WPV), and time

WAITFOR

condition is satisfied, it won’t have to be performed again.

WAITFOR

step to the end of that file.

time, enter your values

time waits that time duration. Both

(WHR,WMN)

can be programmed simul-

Run your program from FILE 5, STEP 1. If you don’t want to go through the entire program, START your program at any STEP in FILE 1 or 5. When the program reaches FILE 5, STEP 6, the HOLD LED begins flashing. This means the program is still running, but is

HOLDing,

Manual

WAITFOR

the ACTUAL temperature to equal the

Sample Proqram Chapter

Page 19

WAITFOR Your program then continues to the last step, a STOP step, and HOLD

To change a programmed step, return to the PROGRAM menu, and enter the FILE and STEP number to change. and press ENTER. Under a step type, to clear all parameters of the current values,

return to that step type and press ENTER. All parameters will return to

Process Variable

(WPV).

When equal, the HOLD LED stops flashing.

again.

Use the UP/DOWN keys to select another step type

their

defaults.

Running Your Series 920

To run the Series 920, you must be at one of the three main level operating parameter

menus, SYSTEM, PROGRAM, or SETUP. Press the RUN/HOLD key. The Series 920 asks you what file the file and step number, the program begins and the RUN LED is lit. While in the

RUN mode, you can only view the current file and step.

you’d like

to run, and asks what step to begin with. After entering

To change your program, you must be in the HOLD mode. To any time, press HOLD. When returning to your program, the Series 920 asks if

like to

been changed, generates an

the START prompt and begin the program again.

When in the PROGRAM menu, SP is programmed to the steps ending set point. When in

the

RESUME? on the step you left off on. Trying to RESUME on a file that has

“ER2

0040”; this is a “Change File Error.” Advance to

the

RUN mode it shows the current set point. In the RUN mode, SE

steps ending set point. Refer to Pages 51 - 52 for definitions of other prompts.

At the SYSTEM prompt, Press @ to enter the PROGRAM parameter values, or

press @ to continue to SETUP.

Graphics Key

1 aa=

One of the three step types will be displayed

JUMPLOOP, STOP, and LINK step types are immediate, and will not be visible.

depending on the type of step

= =

pressm

MODE Key ENTER Key

UP/DOWN

stop your

program

you’d

shows

to continue to PROGRAM mode.

PROGFMMmed.

Figure 8 RUN Key Flow Diagram.

Shaded parameters may not your control.

parameters are dependent on how your control is

configured. See

Chapter 6

information.

NOTE:

appear on

for

These

Sample Program, Chapter 3

WATLOW

Series 920 User’s

ManuaI

Page 20

Chapter 4

How to Install and Wire the Series 920

This chapter tells you how to install the Series 920. information is right here. “burned in” before leaving the factory, the Series 920 is ready to install when you

receive it.

But before you begin working or cutting holes in

chapter to gain an understanding of the entire installation. Consider sensor installation carefully. You’ll need to look at the noise reduction guidelines before making your panel cutout.

Because

Watlow

controls are thoroughly tested, and

All

mounting and wiring

panels,

read through this

Sensor Installation Guidelines

We suggest that you mount the sensor at a location in your process or system

where it reads an average temperature. Put the sensor as near as Possible to the material or space that you want to control. Air flow past this sensor should be moderate. The sensor should be thermally insulated from the sensor mounting.

Excessive lead length

combat this, use a three wire sensor in long lead applications.

in a two-wire

RTD

sensor can create indication

errors.

Input Power Wiring

Microprocessors are in a way

like trout...

WATLOW Series

They require a clean environment to be successful and to prosper. A clean environment means on one level an environment that is free of excessive dust,

moisture and other airborne pollutants. But primarily it means a “clean” source of input power from which to base all its operations. What is “clean power”?

Clean power is simply a steady, noise-free line voltage source that rating specifications of the hardware using it. Wiihout clean power to the integrated circuitry, any microprocessor chip

Just as the water you get from a tap nowadays may not be in some locales, so the line voltage coming into your facility may not be acceptable for your microprocessor devices. You may have to fitter or “clean” the water or the power. In industrial environments, the potential for pollutants increases, especially electrical noise due to high level power occurring in one place.

The recommendations we are providing for you are ways to achieve a minimum level of clean input power protection. remove the potential for input power problems. ures and still do not get results, please feel free to call us at the factory. We are here to see that our control products work well and do the job they were designed to do.

920 User’s Manual

In almost all cases these

isdoomed

If you’ve applied these meas-

to failure.

acceptable

HoHow w to Install and Wire, Chapter 4

How to Install and Wire, Chapter 4

meets

to drink

consumption

guidelines

the

Page 21

Definitions

Ground Loop - A condition created when two or more paths for electricity are

created in a ground line, or when one or more paths are created in a shield.

Earth Ground - The starting point for safety and computer grounds.

a copper rod driven into the earth. Safety Ground - A ground line run with electrical power wiring to protect personnel.

Computer Ground

or microprocessor-based systems. This line is isolated from safety ground.

Common Mode Line Filter - A

power

line legs with respect to ground.

Differential Mode Line Filter - A device to filter noise signals present

between the two power lines themselves.

The D

interference pick up. Do use twisted pair wire and possibly shielded wire from line filters to the control to

keep the line “clean”.

Do keep low power control wires physically separated as far as possible from line voltage wires. Also keep all controller wiring separate from other nearby wiring.

Physical separation is extremely effective. A 12 inch

usually effective.

and

keep line filters as close to the control as possible to minimize the area for

A ground line for the ground connections to computers

device

to filter noise signals present on both

Don’ts

of Clean Input Power

(304.8mm)

It is usually

minimum separation is

Do use common mode, differential mode or a combination of the two filters

wherever power may have electrical interferences.

Do cross other wiring at Do have a computer ground line separate from all other ground lines. This computer

ground line should terminate at the ground rod where the electrical service is grounded.

Don’t connect computer ground to safety ground or any other ground points in

the electrical system, except at the ground rod.

Don’t

mount relays or switching devices close to a microprocessor control.

Don’t run wires carrying line voltage with signal wires (sensor, communications or other low power lines) going to the control.

Don’t use conduit for computer ground. Don’t

have phase angle-fired devices in the same electrical enclosure or on the

same power line with the control. Don’t

connect ground to the control case if the control is mounted in a grounded

enclosure (prevent ground loops). Don’t fasten common mode line filters or filters with metal cases to metal that is at

ground potential. This prevents ground loops and maintains filter How to Install and Wire, Chapter 4

90°

angles whenever crossing lines is unavoidable.

effectiveness.

WATLOW Series

920 User's

Manual

Page 22

How to Check for Ground Loops

To check for ground loops, disconnect the ground wire at the ground termination. Measure the resistance from the wire to the point where it was The ohmmeter should read a high ohm value. If you have a low ohm value across this gap, that means there is at least one ground loop present in your system.

connected-

Table 7

Noise Device Ratings.

Suppression

Also, check for continuity; your reading should be “open”.

If you do find conti-

nuity, you must now begin looking for the ground loops. Begin disconnecting grounds in the system one at a time, checking for continuity after each disconnection. When continuity reads “open” you have eliminated the ground loop(s). Also as you reconnect grounds, keep making the continuity test. It is possible to reconnect a ground loop.

Noise Suppression Devices Available from Watlow

Watlow Controls stocks a few key noise suppression parts. You may order these by calling your local Watlow distributor.

Item

Common Mode Line Filter

Metal

Oxide

Varistor

MOV

Electrical

250V,

15OV,

130V,

275V, 275V,

Ratings

3 Amp

Joule 38 Joule 75 Joule 140 Joule

Part Number 0804-0196-0000

0802-0273-0000

1 0802-0304-0000 1

0802-0266-0000 0802-0405-0000

NOTE:

For

very

“dirty” or critical use micro-computer-regulated power Uninterruptable Power Supply (U.P.S.)

applications,

supply

WATLOW

Line Filtering Configurations For Controls

These three diagrams show you filter configurations for removing input power noise. Choose the one best suited for your system if you are unsure which one

to use.

920 User's

Series Manual

Maual

Page 23

Ground

D.M. Line Filter

Keep filters

inches

(304.8mm)

less from the control. Minimize the line distance

where noise can be

w-introduced to the

control.

Control

Figure 9 Differential Mode

Filter Diagram.

Ground

C.M.

Line

C.M.Line Filter

Filter

Load

- 1

rL-___L:_k_-&~

D.M.

Line

Filter

Control

Figure I0

Common Mode Filter Diagram.

prevent

ground loops, do not fasten common mode line filters or filters with metal cases to metal that is at ground potential. Doing so will reduce filter effectiveness.

Figure 11

Combination

Differential-Common

Mode Filter Diagram.

WATLOW

Series

920 User’s

Manual 23

Page 24

Installation Information

The front panel screw turns

only. Do not apply excessive force or turn the screw more than

CAUTION:

90°

90°.

The Series 920 mounts in a hold

the case against are 3.56 in. deep.If your unit has a

Figure 12 shows the dimensions of the front lbs. (1.25Kg).

For unit dimensional and mounting information, including the location of mounting brackets and size of the front panel’s thickness can be from 0.06

(90.42mm)

panel

cutout with two brackets. These brackets

the

front

panel.

The Series 920 behind-panel dimensions

high by 3.56 in.

triac

output, add another 2.5 in

(90.42mm)

panel

cutout, see Figures 13 and 14. Your

(1.5mm)

wide by 6.0 in.

panel bezel.

to 0.25 in.

(152.4mm)

(63.5mm)

The 920 weighs 2.75

(6.3mm).

to the depth.

Installation Procedure

this procedure to mount the

Make a

Remove the 920 from its case by turning the front clockwise the case.

Place the case in

Attach the mounting brackets either to the top and bottom, or to both sides of the unit.

Tighten the mounting brackets securely against your panel.

panel

cutout per the dimensions in Figure 14.

(CCW).

Grip the bezel

the

cutout you just made.

Watlow

firmly

Series 920 Temperature Control:

panel

and

screw

pull

the control chassis out of

90°

counter-

Figure 12

Series 920 Faceplate

Dimensions.

Insert the the front

hardware installation is complete. Go on to the wiring section from here.

control

panel

chassis into its case and press the bezel to seat it. Turn

screw

90°

clockwise (CW) to

3.81 Sq.

(96.77mm) ‘-1

lock

the control in place. The

3.81 Sq.

(96.77mm)

WATLOW

Series

920

User’s

Manual

How to

Install

and Wire, Chapter 4

Page 25

(23.37mm)

&-Bezel

3.56 ±

0.015

(90.42mm

3 ±0.381

3.81 (96.77mm)

Your Panel

Thickness

0.06 to 0.25

(1.524 to

Mounting

6.35mm)

Bracket

3.622 to 3.653

(92.00 to

Panel

cutout

3.625 x 3.625

(92.08 x

Nominal

92.79mm)

92.08mm)

3.622 to 3.653

(92.00 to

92.79mm)

How to Wire the Series 920

This section has all the information you need to

the Series 920 and your system. Please read the Safety Information in the

narrow column on the outside of each page. You will find internal circuits on the left in the following diagrams, and external circuits on the right. output options are listed by model number. Refer to the unit sticker on your

control to be sure that you are wiring from the corresponding diagram. We

suggest that you read through the entire section

Then proceed, starting with the sensor inputs, auxiliary outputs, then control

outputs, data communications, and finally, power wiring.

complete

before

a good wiring job on

beginning your hookup.

In addition,

It is very important to enter a system set point in the Series 920 before

power to the load circuitry.

applying

Figure 13 Series 920 Dimensions. (side

Figure 14 Series 920

Panel Cutout Dimensions.

To shock, make all connections on the back before

power to the control. Also, disconnect power before

opening

920.

load power to the output circuits until you have entered a

system set

view)

WARNING:

avoid electric

of the control

connecting

the

Series

Do not apply

point

In all wiring diagrams, internal circuits are on the left and external

circuits

How to Install and Wire, Chapter 4

are on the right.

WATLOW Series 920 User's Manual

Page 26

To electric shock, use National Electric Code safety practices when wiring and connecting this

source and to

WARNING:

avoid potential

unit to a power electrical sensors or

peripheral devices.

Power Wiring

NOTE:

For

jumper 18

230VAC,

NOTE:

For jumper 17 to 19

and jumper l8 to 20

115VAC,

2 WARNING:

To avoid electric shock, connect the chassis ground terminal to “Earth

Ground.”

Figure 15 Series 920 Power Wiring.

Remove the short green ground

jumper on the back

of the 920 your control is mounted in a metal panel connected to safety (chassis) ground. Removing the jumper will prevent ground

loops. OR

Leave the short green ground jumper in place if the Series 920 case is not connected to safety (chassis) ground.

CAUTION:

(T-21)

Chassis

GND

Green GND

Wire

Disconnecting the green ground jumper

present on the metal case.

Connect the AC power lines and the jumper wires to the power supply terminal strip of the Series 920. Study the strip connections carefully before beginning. Be sure to use these jumpers on the power supply

jumper 18 to 19. For

All wiring and fusing should conform to the National Electric Code and to any locally applicable codes also.

When you apply power without sensor inputs on the Signal Conditioner termi-

nal strip, the Series 920 alternately flashes from SYSTEM to is an error code indicating an open sensor. These are unit without sensors.

Before applying power, open the Series 920 and set DIP Switch #1 “ON” for a Cold Start.

the unit. (This clears all previously entered information from the 920; it is a

“clean” or “cold” start.) Now remove power again, open the unit, and set the Switch #1 to OFF, (This

will make the next

information in the processor’s memory.) Close the 920.

3 WARNING:

Replace the control chassis in the enclosure and apply power to

start

Ground

wire

could allow A.C. voltages to be

115VAC,

jumper 17 to 19 and jumper 18 to 20.

a “warm” one, retaining all subsequently entered

terminal

normal

strip.

ERl

displays for a

Ground

For

230VAC,

00XX. This

WATLOW Series 920 User's Manual

How to Install and Wire, Chapter 4

Page 27

Input Options: Terminals 1 - 8 Apply One Input Only

RTD

l For

RTD

input, use

Terminals 1,2

and 3.

NOTE:

For a

two-wire use Terminals 1 and 2 for the RTD, and jumper Terminal 2 to Terminal 3.

RTD,

l For

0-5VDC, 0-20mA

1-5VDC, 4-20mA

input, use Terminals

4 and 5.

T.C. Compensation

For T/C input, use

Terminals 6 and 8.

Front-Panel Input Selection Also Required

Auxiliary Output: Terminals 9 - 13

Figure 16 input Options

Wiring Diagram.

See model number

information, p. 61, for the input option that applies to your

unit.

Figure 17

Auxiliary Wiring

Diagram.

See model number

information, p. 61,

for the alarm output

option that applies

to your unit.

Terminals 9 & 10

are Auxiliary Output

NOTE:

Auxiliary outputs go to a de-energized state when in an

How to Install and Wire, Chapter 4

alarm

condition.

WATLOW Series 920 User's Manual

#2.

12, & 13 are iary

NOTE:

Terminals 11,

Auxil-

Output

#1.

Page 28

Output #1 Option B, Terminals 22 - 24

Figure 18 Output 1, S.S. Relay, Option "B", Wiring

Diagram.

Figure 19

Output 1

S.S. Switch,

Option

Wiring Diagram

"C",

Model#92OA-_

S.S.

B _

m ,

_-_000

output

#1 to

Load from

S.S. Relay,

23 N.O.

(MT2)

0.5A

Output #1 Option C, Terminals 22 - 24

Model #92OA-_

C _ _-_000

WATLOW Series 920 User’s

Manual

Output

Load from

S.S. Switch, 20mA

Switched DC (open

Unreg.

#1 to

collector)

(20VDC @ 20mA

max.)

Switched

+ 3-32VDC

Solid State

Page 29

Output #1 Option D, Terminals 22 - 24

Model #92OA-_

D_ _-_000

Output #1 to

Load

from

6A SPDT Relay

;~~~~~~~~~~~~_~_~_______, i

Mechanical

Relay

:t : :

I : :

I.1

I : :

Output #1 Option E, Terminals 22 - 24

/?\

Figure 20 Output 1 Relay, Wiring Diagram.

If you use normally closed

the mechanical relay, you may need to add an external snubber (Watlow

Part #

0000) across the normally closed

contacts to avoid

Option "D",

CAUTION:

contacts

0804-0147-

Mech.

RF noise and potential malfunction.

mally

open contacts

are

protected

internally.

Nor-

Model #92OA-_

_-_000

Back of the control

15ATriac

Figure 21Output 1, Trlac, Option “E", Wiring Diagram.

NOTE:

Terminal #24

not

have load wires

connected to it. It is

used

only

for the

gate of the

located

on the back

of the control.

should

triac

How

to Install and Wire,

Chapter

WATLOW

Series 920

User's Manual 29

Page 30

NOTE:

Current for the

4-20mA sourced the control.

Use ungrounded

sensors only.

Figure 22 output

Option Wiring Diagram.

loop

internal to

1,4-20mA "F",

Output, #l

Option F, Terminals 22 - 24

Model #920A-_

F _ _-_000

Output #1 to

Load from

4-20mA

source

Figure 23 No Output 2.

Figure 24 output 2 Option

Diagram.

S.S. Relay,

"B",

Wiring

Output #2 Option A, Terminals 14 -

Model #92OA-

A_-_000

14 Not Used 16 Not Used

Output #2 Option B, Terminals 14 - 16

Model #920A-

B_-_000

Output

Load from

S.S.

Relay,

#2 to

0.5A

WATLOW Series 920 User’s

Manual How to Install and Wire, Chapter 4

D I

I D

14 N.O.

(MT2)

16 COM (MT1)

LOT+*

Page 31

Output #2 Option C, Terminals 14 - 16

Model #920A- _ _ C - _ 000

Output

Load

S.S.

14 Switched DC

15+ Unreg. (20VDC @ 20mA max.

#2 to

from

Switch,

20mA

(optn collector

Figure 25

Output 2 S.S.

Option "C", Wiring Diagram.

switched

+ 3-32VDC

Input

Switch,

3 to 32VDC

input

Output #2 Option D, Terminals 14 - 16

Model #92OA-

_ _D_-_000

6A SPDT Relay

you

closed contacts of

the

relay,

snubber Part #

0000) normally closed contacts to RF noise and potential tion. open contacts

protected

Figure

Output 2

Relay, Option

Wiring Diagram.

CAUTION:

use normally

mechanical

you may need

add

an external

(Watlow

0804-01479

across the

avoid

malfunc-

Normally

are

internally.

Mech.

“D”,

How

to Install and

Wire, Chapter 4

WATLOW Series 920

User's Manual

Page 32

System Wiring Example

Figure 27 System Wiring Example.

This example shows a typical Series 920 wiring scheme. of many output configurations.

92OA-2DDO-A003

Temperature Conrol

Control

Power

L 2 115VAC

Earth Ground

it represents only one

High Limit

Control Power

120 VAC

140A-16XX-6000

High Limit Control

WATLOW

Series 920

User's Manual

How to Install and Wire, Chapter4

Page 33

Chapter

How to Tune the Series 920

This chapter will explain tuning the Series 920 to the system it controls.

Recommended Tuning Reference

There are a number of quality references on the art of tuning electronic control-

lers

to the systems they control. qualified to tune thermal systems, we suggest that you obtain and become familiar with the reference below before attempting to tune your system.

Remember that the of control you

need.

time

you spend tuning your system is relative to the quality

If you are not an instrument technician

Process Control Instrumentation Technology - Third Edition

by Curtis D. Johnson

ISBN:

0-471-05789-4 approx. $37.00

“Its overall objective is to provide instructional material for a general understanding of process control characteristics such as elements, modes, and stability along with detailed knowledge of measurement technique, control mode implementation, and final control element functions.” Johnson

hard cover, 1982,497 pp.

Using A Chart Recorder

The tuning procedure will be greatly simplified if you use a chart recorder to assist in tuning the Series 920. While the Series 920 itself will not drive a chart recorder, there are several Watlow controls and indicators which will. Your Watlow sales engineer or distributor can help you select one. drive sensor near the Series 920 sensor so that the recorder is reading the same system response.

If you don’t have a chart recorder available, you can still plot the time vs. temperature system response. Record the 920’s ACTUAL display readings on graph paper with an x, y

Load

LEDs

axis to

accomplish the same thing.

Place the chart

The °F/°C

DIP Switch #6 to the ON position for load indication. The °F LED now tions as an LED for Load 1 and the °C LED functions as an LED for Load 2. These a constant rate. When determine the interaction between heating and cooling.

How To Tune The Series

LEDs

also function as load indicators. When tuning your control set

func-

help you

determine

used

920, Chapter

when the system has stabilized by cycling at

in a heat/cool application, these

LEDs

help

WATLOW Series 920

User's

Manual

Page 34

Tuning

For optimum control performance, tune the 920 to a thermal system. The tuning settings here are meant for a broad spectrum of applications; your system may have somewhat different requirements. grams and definitions on Pages

NOTE:

When tuning in the Heat

41,45 -

mode, use

point above ambient. When tuning in the Cool mode, use point below ambient.

Apply power to the Series 920 and enter a set point in the SYSTEM

menu. Next, go into the SETUP mode, and enter ACCESS (1), the parameter Using the MODE, UP/DOWN, and ENTER keys, set the ing Parameters initially: (Proportional Band) PB H (C) =

0.00, (Rate) RT H

0.00, (Cycle Time) CT H (C) = 5, (Rate band) RBH

Refer to the key flow charts and dia-

47 for prompt location and description.

PID

prompts followed by H. Set the set

PID

prompts followed by C. Set the set

PID

Operat-

0, (Reset) RS H (C)

Allow actual

process temperature to stabilize at or near Set Point

(SP). The

ACTUAL display will indicate when the load is stabilized near set point.

Proportional Band Adjustment: Gradually increase PB until the ACTUAL display temperature stabilizes to a constant value. The temperature will not be right on set point because the initial reset value is 0.00 repeats per minute. When tuning in the heat mode, the ACTUAL temperature will stabilize below the desired set point. When tuning in the cooling mode, the ACTUAL temperature stabilizes above set point. (When PB = 0,

RS, RT, and CT are inoperative, and the 920 functions as a simple ON/OFF control with a 3°F or 1.7°C switching

Reset Adjustment: Gradually increase

differential.)

until the ACTUAL display temperature begins to oscillate or “hunt”. Then slowly decrease RS until the ACTUAL display stabilizes again near set point NOTE: This is a slow

procedure, taking from minutes to hours to obtain optimum value.

Cycle Time Adjustment: Set CT as required. Optimum system control is always achieved with faster cycle times. However, if a mechanical contactor or solenoid is switching power to the load, a longer cycle time may be desirable to minimize wear on the mechanical components. Experiment until the cycle time is consistent with the

Rate Adjustment: Increase RT to 1.00 min. Then raise SP by

quality

of control you want.

20°

WATLOW

Series 920 User’s

Manual

HowToTune The Series 92O,Chapter5

Page 35

30°F,

or 11° to

17°C. Observe

the system’s approach to SP. If the load

temperature overshoots SP, increase RT to 2.00 minutes. Then raise SP by 20 to

the new set point.

30°F,

or 11 to

17°C

and watch the approach to

If RT is advanced too far, approach to the set point will be very sluggish. Repeat as necessary until the system rises to the new set point without overshooting or approaching the set point too slowly.

Calibration Offset Adjustment: You may want your system to control to a temperature other than the value coming from the input sensor. measure the difference (as much as perature,

perhaps at another point in the system, and

±90°F

±50°C)

between that tem-

the

process value

If so,

showing in the alphanumeric display. Then enter the amount of CAL offset you want. Calibration offset adds or subtracts degrees from the value of the input signal.

The LOPWR and HIPWR Parameters

The LOPWR and HIPWR parameters allow you to limit the duty cycle of the beat output to minimum and maximum values. The LOPWR parameter is used to generate a minimum duty cycle regardless of the duty cycle

the

PID

circuit.

LOPWR Example:

LOPWR = 20%

calculated

The

PID

circuit calls for a duty cycle of 10%. The LOPWR parameter overrides

the

PID

circuit and outputs a duty cycle of 20%.

For the HIPWR parameter, a maximum duty cycle is generated regardless the duty cycle calculated by the

HIPWR Example: The

PID

circuit calls for a duty cycle of 100%. The HIPWR parameter over-

rides the

PID

circuit and outputs a duty cycle of 80%. These two parameters

HIPWR = 80%

PID

circuit.

help insure that an “idle” duty cycle is always applied, or that the heaters

cannot apply full power to the thermal system.

Where To Go From Here

Once you have tuned your Series 920, continue to Chapter 6 to learn how to program your Series 920 for your system.

How To Tune The Series 920, Chapter

WATLOW

Series 920 User’s Manual

Page 36

Chapter 6

How To Program The Series 920

This chapter will enable you to set up the Series 920 quickly and easily. explain why it’s a good idea to write out your parameter values. shows you flow diagrams of the programming process.

Chapter 6 also

Write Out Your Program

The Watlow Series 920 controls temperature for a specific heating and/or cooling process. Your setup parameter values, when they’re entered, give the Series 920 orders for the work you want it to

Since the amount of information in the setup is extensive, we suggest that you write the value on a copy of the Master Step Chart on Page 53. This will enable you to set up the Series 920 quickly and without mistakes. The chart makes a good record of your values.

perform.

Programming in General

Programming the Series 920 is easy as 1 - 2 - 3:

1. Use the MODE key to select the alphanumeric display prompt you want.

2. Use the UP/DOWN keys to select data or prompts in the alphanumeric display.

3. Press ENTER.

It will

Select the Proper DIP Switch Settings

Prior to programming and operating the Series 920, you must set the DIP Switches. DIP Switch #1 sets a “warm” or “cold” start following power removal from the 920.

With the DIP switch in the OFF position for a “Warm Start”, the micro-processor uses

previously programmed information as if power had not been removed. A Cold Start starts “clean” or completely cleared of all user-programmed information when the DIP switch is in the ON position. All parameters will be empty or set to the default limits.

DIP switch #2 is not used. Set it to the OFF position. DIP switch #3 selects tenths of units displayed for process inputs. DIP switch #4 is ON for DIP switch #5 is for units with

position. DIP switch #6 determines whether the front panel LED’s to the right of the actual

display are load indicators or indicators.

DIP switch

factory selected parameters are displayed.

#7, when

0-5VDC/0-20mA

4-20mA

OF/%

OFF, displays all SPCLFUNC parameters. When ON, only

input & OFF for

output. If you have this unit, set #5 to the ON

indicators. When OFF, the

1-5VDC/4-20mA

LEDs

are

input.

°F/°C

WATLOW

Series 920

DIP switch #8 is for factory test and calibration, it must be OFF.

How To

User’s

Manual

Program

the Series 920, Chapter 6

Page 37

Event Outputs

Another feature of the Series

920

is its capability for two event outputs. An “event output” is simply a pre-programmed ON/OFF event per program step. The event may turn any number of peripheral devices ON or OFF to

assist you

controlling your process, system or environment. For instance, in an environmental chamber, you might wish to circulate air at a

given time in

your program

for one or more steps. You might want to turn lights

ON or OFF, or signals, or lock out your humidifier, or you could activate a video

recorder. EV1

and EV2 will not be visible

under

the SYSTEM menu until you SETUP

AUX1

and AUX2 as events (EV). Enter the SETUP menu, and enter ACCESS (5). This is the

cial Function) parameter. Press the MODE key until you reach the rameter and press ENTER. The default for

AUX1

and AUX2 is AL

SPCLFUNK

AUX1

(Alarms).

(Spe-

pa-

Change the value to EV (Events) if it hasn’t already been done.

If you return to the SYSTEM menu,

turned ON or OFF from here.

SETPOINT

parameter in the PROGRAM menu.

If the events are programmed

EV1

and EV2 will be visible,

EV1

and EV2 can also be

for one step and left unprogrammed for the next

viewed

and can be

under

the

step, the events will maintain the last programmed status.

These event outputs are mechanical relays rated at 6 amps up to

240VAC

Guaranteed Soak

The Series 920 Guaranteed Soak (GS) feature insures that the process temperature tracks a programmed ramp. The Guaranteed Soak acts as a alarm. The program clock halts if the ACTUAL temperature exceeds the Guaranteed Soak value. At this time the HOLD LED flashesand the clock starts once the process variable is within the GS deviation value. Programmed in degrees or process units, GS is in the SETUP menu under ACCESS (5). Entering a value of

(0)

disables the Guaranteed Soak function. Figure 28 is an example of the

Guaranteed Soak function.

Temperature

Guaranteed Soak

Window Around Set

Point

deviation

Programmed Ramp

Figure Guaranteed Soak (GS) Example

If the program is put in the HOLD mode while holding for a guaranteed soak and restarted at another step, the GS has to be met for the previous step, before the program can continue.

28 -

NOTE:

How To Program the Series 920, Chapter 6

Time

WATLOW

Series 920 User’s Manual

Page 38

The Four

JUMPLOOP

Types

The Series 920 gives you the capability to perform four basic your programming. The backward jump,

foward

jump, nested loops, and

jumploop

types in

intertwining loops. These are only definitions of the four loops. The Series 920 has very few rules concerning loops in your program.

Backward Jump

The Backward jump is the most common jump. A backward jump will force you to a step already performed. The Jump Step (JS) must be less than the current step. You cannot

Step

3 Step Step Step

The steps in sequence will be:

Your Jump Count (JC) can be anything from 0 - 100. an infinite looping and will never progress to Step 6.

JUMPLOOP

SETPOINT SETPOINT SETPOINT JUMPLOOP STOP

2,3,4,5,2,3,4,5,6.

to the step that you are on.

JS-02

JC-01

If you enter 0, this

will

Forward Jump

The next loop type is a

The Jump Step must be greater than this step.

The steps in sequence will be:

WATLOW Series 920 User’s Manual

Step Step Step Step Step

Forward

1 2 3 4 5

SETPOINT

JUMPLOOP

SETPOINT STOP

jump. By definition you can jump forward.

JS-05

JC-01

1,2,3,5.

How To

Program

the Series 920, Chapter 6

Page 39

Nested

LOOP

A “Nested” loop is a jump loop within a loop. You will be forced to a step either forwards or backwards from your present location. When nested loops are performed, they cannot break across other loops. Your JC can be from 0 - 100 with 0 being an infinite looping.

Step

Step Step Step Step Step

Step

1 2 3 4 5 6

SETPOINT SETPOINT JUMPLOOP

JS-02 JUMPLOOP JS-01 SETPOINT JUMPLOOP

JS-01

STOP

JC-01 JC-01

JC-01

The steps in sequence will be:

1,2, 3,2,3,4,1, 2, 3,2,3,4,5,6,1,2,3,2,3,

4,1,2,3,2,3,4,5,6, 7.

Intertwined

An “Intertwined”

Step Step Step Step Step

LOOP

loop can break across

SETPOINT SETPOINT JUMPLOOP JUMPLOOP JS-02

STOP

other

loops.

JS-01

JC-01 JC-01

Rules to Follow

The one basic rule that you must follow is that you can only have a

maximum of three consecutive jump loops.

Step 1 Step 2 Step 3 Step 4 Step 5

Step 6

SETPOINT JUMPLOOP JUMPLOOP JUMPLOOP JUMPLOOP

STOP

JS-01

JC-01

JS-01 JC-01

JS-01

JC-01

JS-01 JC-01

Your program will run until it reaches Step 5, and you will receive an

ER2 0039. This is the infinite looping error, and means that you have too

many consecutive loops. Another rule to follow is that you cannot

JUMPLOOP

to a step that you are on. You will receive an ER2 0039. Clear the error in the ER2 parameter under the SYSTEM menu and retransmit your data.

Use simple loops in your program!

How To

Progam

the Series 920, Chapter

WATLOW

Series 920 User’s

Manual

Page 40

The next pages will show you each of the Series 920 menus and their prompts

and values. Each section, SYSTEM, SETUP, and PROGRAM, has a menu graphic with a table of values, followed by prompt definitions. tables and charts here, but make copies to document your control.

Prompt definitions are also listed in the glossary.

Don’t write in the

SYSTEM Menu

The SYSTEM mode shows the status of the SYSTEM set point, event outputs, and error prompts for clearing errors. Step through the SYSTEM menu using

the key flow diagram below, and table on the following page. Note that several

parameters are only visible when they are entered under SETUP, or when errors exist.

Graphics Key

aa =

MODE Key

ENTER Key

UP/DOWN Key

r---

Figure 29 SYSTEM Key Flow

Shaded parameters

may not appear on your control. These parameters are dependent on how your control is configured. See Page 41 for more information.

NOTE:

To SYSTEM

Press a to enter SYSTEM menu.

After entering a value, continue to the next parameter by pressing

At any RETURN, you can press @ to return to

SYSTEM, or

pressm

to return to the first parameter.

WATLOW Series 920 User’s Manual

How To Program the Series

920,

Chapter

Page 41

Table 8

SYSTEM Prompts and

CLR

ALARM

RETURN

Displays Press

the

SYSTEM prompt

Press the MODE key to return to the

prompt.

Description.

the

current

ENTER

key to return to

alarm.

Make photocopies,

1-2

keeD original clean:

. . . . :,:.:.:.: : :., . ..

;f+Rpj .:.:.:.:.

h¥ . .

,g?#@~~:

:..

l?IIzIl

. .: ::

_1.:.,.:.. . . . . . . . . . . . ..,.:...::

g:“..:“.’

.: .

..,.. ..,.;.y..

One of three main

level operating menus. From the SYSTEM menu, you can generate a

non-

ramp set point (fixed), manipulate Events 1 and 2 ON or OFF, clear system errors, and clear

latching alarms.

Represents the current set point. Range:

This auxiliary output can be an

HOLD Range: OFF or ON

This auxiliary output can be an alarm or event. HOLD mode. Range: OFF

ER1 all outputs are turned off, and your program stops running. When an error occurs,

RAL

and RAH Default:

mode.

EV1

will only appear when

73°F

alarm

or event.

AUX1 = EV,

Events may be turned ON or OFF in the

under the SPCLFUNC menu.

Default: OFF

Events may be turned ON or OFF in the

EV2 will only appear when AUX2 =

or ON

Default: OFF

EV,

under the SPCLFUNC menu.

is considered a fatal error; your system will shut down. When the Serles 920 shuts down,

ER1

00XX alternately flashes with the SYSTEM parameter. When in either the RUN or HOLD mode, press the ENTER key to stop condition.

To clear an error, ENTER the SYSTEM mode, and scroll to the

Press ENTER; this clears the error unless it is a

Range: 0 -

ER2

unless it is a

considered

program

non-fatal. if you are in the RUN mode, your program continues running

error.

ER1

from flashing for 5 minutes. This will not clear the

ER2 00XX

re-occuring

appears, and flashes alternately along with the

error and has not been resolved.

ER1

parameter.

error

parameter you are presently on. When in either the RUN or HOLD mode, pressing the

ENTER key

Clear an

steps ER2

ER2

by pressing the ENTER key while in the RUN mode, or return to the

from flashing for 5 minutes. This will not clear the error condition.

ER2 parameter under the SYSTEM mode. Press ENTER. If the error persists, refer to the Error Code

list at the

Range: 0 -

Alarms 1

continue to run.

presently

from flashing for 5 minutes. This will not clear the alarm condition. ENTER the CLR

end of the manual to clear.

and

2 are considered non-fatal. If you are in the RUN mode, your program will

ALMX XX

appears and flashes alternately with the parameter you are

on. When in either the RUN or HOLD mode, press the ENTER key to stop

ER1

ALARM

parameter to clear a latching alarm. A non-latching alarm clears itself once it fails within the

alarm

limits.

Range:

- 2

RETURN 1

How To

Program

From any

RETURN,

the Series 920, Chapter 6

you can go

back to SYSTEM prompt.

WATLOW

Series 920 User’s Manual

Page 42

SETUP Menu

Figure 30

SETUP Key Flow

NOTE:

Shaded parameters may not appear on your

control.

parameters are dependent on how your control is

configured. See

Pages 43 - 48 for

more information.

These

While in the HOLD

mode,

press the MODE key until you see SETUP, press ENTER. These parameters are to setup the personality of your Series 920. Using the MODE to progress through the prompts, use the UP/DOWN keys to select parameters and values and press ENTER.

Select each ACCESS number. Follow that parameter sequence to enter values. You must return to SYSTEM before you can continue to the next ACCESS number.

’

Graphics Key

:I@

aa =

MODE Key

ENTER Key

UP/DOWN Key

At the SYSTEM prompt, press ato continue to SETUP.

Press @ to enter the SETUP menu.

NOTE:

Changing certain

parameter values

will default other

parameters and clear all programmed files. See Page 44 and 47 for details.

WATLOW

Series

To SYSTEM

920 User's Manual

Press

press

to return to SYSTEM,

to return to the first parameter.

How To Program the Series 920, Chapter 6

Page 43

Prompt

ACCESS = (0)

To enter Tl XX:XX HOUR MIN CAL Enter the Calibration Offset value A1H Al L A2H A2L

RETURN

Description

CALIB

parameters, use ACCESS (0) and ENTER. Read only. Displays the Enter the hours to display the system time-of-day clock. Enter the minutes to

Enter the Alarm 1 High value. Displayed if

Enter the Alarm 1 Low value.

Enter the Alarm 2 Enter the Alarm 2 Low value. Press the ENTER key to returnto the SYSTEM prompt Press the MODE key to return

High

Real Time.

display

value.

the

Displayed if

Displayed

svstem time-of-day

Displaved

to the CALIB

if AUX2 = AL

AUX1 = AUX1 = AUX2 =

prompt

clock.

Range

0-23 hours

0-59

minutes

-90 to

90°F, -50 J See Below.

See Below. See Below.

50°C

Default

RAL

RAH

RAL

Your Settings

AXH J

Range

Process Default Deviation Default

& High

Slew Limit

382°F/750°C

ifPB H=O.

999°F/555°C/U

AXL J

Range

Process Default

Low Slew

Limit

32°F/O°C -999°F/-555°C/U

Devlatlon Default

PBC RSC RTC CTC

RBC

RETURN

Prompt

How To Program the Series 920, Chapter 6

Not displayed if OUT = HT or CL Enter the Proportional Band Not displayed if OUT = HT. Enter the Reset Not dlsplayed if OUT =

Enter the Rate value, Cooling.

Not

displayed

Enter the Cycle

Not dlsplayed if PB H = 0.

Enter the Rate Band value, Not displayed if OUT = CL, and PB C = 0.

0 denotes rate is always

Press the ENTER key to return to the SYSTEM prompt

Press the MODE key to return to

value,

if OUT =

Time

value,

Cooling.

Coollng.

HT,

and PB C = 0.

HT, and

PB C = 0.

value, Coding.

Dependent on output & OUT.

cooling

functional.

the PID

Description

prompt.

0 -

900°F/0 - 500°C

0.00 - 5.00

0.00 - 5.00 minute 0.00

l-6Oseconds

O-7timesPBC

repeats/minute

Range

WATLOW Series 920 User’s Manual

45°F/7.22°C

0.00

5 0

Default1 Your Settings

Page 44

NOTE:

Changing these parameter values

will

default other parameters

clear all programmed files. See Page 47 for details.

and

LOCK CLR FlLE

RETURN

WATLOW Series 920 User’s Manual

Enter

the Press ENTER to display FILE?. Enter a file number to dear. Press Press

Front panel Lock code.

the

ENTER key to return to the SYSTEM prompt.

the

MODE

key to return to the SPCLFUNC prompt.

0-2 1 -

How To Program the Series 920,

Chapter

Page 45

One of three main change system-operating parameters such as alarm points, number to create the personality of your Series

level

PID

settings

operating menus.

and communications.

From the SETUP menu, you can setup or

real

time,

You must select each ACCESS

920.

high/low

range, alarm types,

1 ACCESS (0) 1

CALIB

00:00

CAL

()

ACCESS number (0) must be selected to enter the personality of your Series 920 into the

CALIB

parameters.

In the Series 920, when ACCESS (0) is entered under the SETUP menu, the parameters appear. These parameters set up the Real Time clock, alarms, and the calibration offset of the process variable.

Represents the Midnight = 0 hours and 0 minutes. A Read Only parameter.

Represents the SYSTEM 24 hour time-ofday

Range: 0 - 23 hours

The SYSTEM 24 hour

Range: 0 - 59 minutes Default: 0

An offset of the process variable. This number is added to the value that the system

derives. The final result is used for the control Range: -50 to

The Series 920 will display this parameter

deviation alarm for Alarm 1. Displayed only when AUX 1 = AL. See Page 43. This parameter represents the low process alarm or low deviation alarm for Alarm 1 of

the Series 920. Displayed only when AUX1 = AL See Page 43.

Represents the high process alarm or high deviation alarm for Alarm 2 of the Series

920. Displayed only when

current

Real Time hours and minutes of the Series 920s System.

clock

time-of-day

50°C/-90

Default: 0

clock setting for minutes.

9O°F

AUX2 =

for hours.

point.

Default: 0

represetin9

AL. See Page 43.

the high process alarm or high

Midnight = 0 hours.

CALIB

The low process only when AUX2 = AL. See Page 43.

From RETURN, you can go back to the SYSTEM prompt by pressing the ENTER key,

or return to ACCESS (0) menu by pressing the MODE key.

In the SETUP menu, ACCESS (1) must be selected to enter the

When ACCESS (1) is entered under the SETUP menu of the Series 920, the

parameters will appear. These parameters consist of reset), and Derivative (rate) actions.

A proportional temperature band expressed in degrees within which a temperature controller proportioning function is active for heating. Expressed in degrees. This parameter will not appear if OUT = CL.

Range: 0 to

A reset (integral) heating control action that between set point and actual process by repeats per minute. This parameter isn’t displayed if OUT = CL, or PB H is set to 0.

Range: 0.00 to 5.00 repeats/minute

The rate (derivative) heating function of the Series fast the error being corrected is increasing.

not appear if OUT=CL, or PBH=0.

Range: 0.00 to 5.00 minutes

How To Program the Series 920, Chapter 6

alarm

900°F/0

or low deviation alarm for

500°C

Default:

Default: 0.00

45°F/25°C

automatically

temperature in

Default: 0.00

Expressed in minutes. This parameter will

Alarm

2 of the

Proportional,

a proportional control. Expressed

920.

The rate is determined by how

Series

PID

parameters.

Integral (auto

eliminates offset, or “droop”,

WATLOW Series

Displayed

920.

PID

920 User’s Manual 45

Page 46

The heating cycle time usually expressed in seconds for a OFF cycle. Time between successive turn ons. This parameter will not appear if: OUT CL, or PB H = 0 or if your Series 920 has a Range: 1 to 60

seconds

Default:

4-2OmA

controller

output and OUT =

complete

one ON/

HT/CL.

A thermal control band for heating, that defines where the rate This band is in multiples of the heat OUT=CL, or PB H=0.

Range: 0 to 7 times PB H

The area where no heating or cooling takes displayed if OUT = HT or CL.

Range: -20 to

A temperature band expressed in degrees ing function is active for cooling. This parameter will not appear if OUT = HT.

Range: 0 to Reset (integral) cooling control action that automatically eliminates offset, or “droop”,

between set point and actual process temperature in a proportional

repeats per minute. This parameter will not appear if OUT = Range: 0.00 to 5.00 repeats/minute

The rate the

error

appear if OUT=HT, or PB C=O.

Range: 0.00 to 5.00 minutes

The cooling cycle time cycle. Time between successive turn ons. This parameter will not appear if: OUT =

PB C = 0. Your Range: 1 to 60 seconds

2O°F,

C or Units

900°F/0

500°C

(derivative)

being corrected is increasing.

cooling function of the

expressed in

Series

920 has a

proportional

Default: 0

Default:

Defauk

seconds for a controller to

4-20mA

Default: 5

band. This parameter

place

in a heat/cool proportional control. Not

within

which a

45°F/25°C

Default

Expressed in minutes. This parameter will not

0.00

output and OUT = CL or

0.00

Series

920. The rate is

(derivative)

temperature

control.

HT,

of PB C = 0.

determined

complete

CL/HT.

function begins.

will

not appear if

controller proportion-

Expressed in

by how fast

one ON/OFF

HT.

A thermal control band for cooling that defines where the rate

Use the same as RB H. This band is in

parameter will not appear if OUT= CL, or PB C = 0.

Range: 0 to 7 times PB C From RETURN, you can go back to the SYSTEM prompt by pressing

return to

In the SETUP menu, ACCESS (3) must be selected Here you can manually adjust percent power.

When ACCESS (3) is selected under the SETUP mode of the Series 920, the MANUAL

parameters appear. The outputs revert to manual percent power control at the percent power that they happen to be currently at.

Allows the operator to manually adjust the percent power output. The default value displayed and controlling at, is the value the

menu was entered. -100 to 100 represents full

ter will take priority over the LOPWR and

Range: -100 to 100

PID

by pressing the MODE key.

Default: % of power output when MANUAL is entered

multipIes

Default: 0

PID HIPWR

of the cool proportional band. This

to enter

calculated when the MANUAL parameter

cool

to full heat,

parameters.

(derivative)

the MANUAL parameters.

function begins.

the

ENTER key, or

respectively

This parame-

46 WATLOW

Series 920

User’s Manual

How

Program

the

Series

920,

Chapter

Page 47

From RETURN, you can go back to the SYSTEM prompt by pressing the ENTER key, or

return to ACCESS (3) menu by pressing the MODE key.

In the SETUP menu, ACCESS (5) must be selected to enter the SPCLFUNC parameters.

When ACCESS (5) is selected under the

Function parameters appear.

Here you can select the input type, degrees, output type,

SETUP

mode of the Series 920, the Special auxiliary, and alarm types among others. Selects the type of sensor used as an input to the Series 920. This parameter will not

appear if DIP switch #7 is ON. Changlng this parameter defaults parameters SP,

A1H,

and clears all programmed files.

Range: Dependent on model number.

Default: Dependent on input type.

A1L,

Accepts the sensor input and scales it to degrees Celsius, Fahrenheit, or Units of measure. This parameter will not appear if DIP switch #7 is ON.

Range: C, F, or U

Default: F

Select an output type. Action in response to the difference between set point and process variable.

This parameter will not appear if DIP switch #7 is ON.

Range:

Heat

PID

HeatPlD/Cool PID HT/CL

Cool PID Cool

PlD/Heat PID

CL CL/HT

Default: HT

Represents a low limit to set point. The

type. This parameter will not appear if DIP switch #7 is ON.

default

values are also the low limits of your input

Changing

this parameter

clears all files. Range: Input selection dependent.

Represents a high limit to set point. The default values are input type. This parameter will not appear if DIP switch

also

the high limits of your

is ON. Changing this param-

eter clears all files.

Range: Input selection dependent.

Allows a selection of program steps to run a ramp rate in either degrees/minute or time

duration. This parameter will not appear if DIP switch #7 is ON. Range: Time or Rate

This parameter determines whether Auxiliary Output 1 will be an alarm or event output for

the

Series

920. This parameter will not appear if DIP switch #7 is ON.

Range:

Alpha Display AUX1

AUX1

Default: AL

This parameter determines whether Auxiliary Output 2 will be an the Series 920. This parameter will not appear

Range:

Alpha Display AUX2

AUX2 EV

Default: AL

How To Program the Series 920, Chapter 6

Default: Time

Auxiliary Outout Alarm Output

1’s Function

defined

for AUX 1

Event Output defined for AUX 1

DIP switch #7 is ON.

. .

Auxiliarv

Output 1's

Fun&on

Alarm Output defined for AUX 2 Event Output

defined

for AUX 2

alarm

or event output for

WATLOW Series

920

User’s

Page 48

Determines whether the alarm type for Auxiliary Output 1 will be a process alarm for the Series

Range:

920. Alpha ALTYP1 ALTYP1

This parameter will not appear if

Display

P D

Alarm Type Process Alarm Deviation Alarm

AUX1 =

AL, or DIP switch #7 is ON.

Default: P

alarm

or a deviation

Determines whether the alarm type for Auxiliary Output 2 will be a process alarm. This parameter will not appear if AUX2 = AL, or DIP switch #7 is ON.

Range:

Selects alarms as latching or non-latching. Latching remains energized until you manually clear it. This parameter will not appear if DIP switch

Range:

Allows the operator to change the input gain of the will not appear if the input type is not RTD whole or RTD tenths, or DIP switch

Range:

Selects the minimum percent of power that the appear if DIP switch #7 is

Range: 0 to

Selects the

appear

if DIP switch #7 is ON.

Range: 0 to 100%

The Guaranteed Soak parameter guarantees the actual temperature is being controlled within a

window around set point. the actual temperature is within the soak window. Range: 0 to

Alpha

Display

ALTYP2 P

ALTYP2 D

LAT

NLAT

JIS

or DIN

100%

maximum percent of power that the

90°F/

Default:

ON,

Default: 0

Default: 100

50°C

NLAT

JIS

exceeded, the step time clock stops and the HOLD LED flashes until

Default: 0

Alm Type

Process Alarm

Deviation Alarm

Default: P

is ON.

RTD

Input for diierent curves. This parameter

Series

920 will output. This parameter will not

Series

920 will output. This parameter will not

alarm

or deviation

is ON.

RETURN 1

Represents the selection of the protocol type for serial communications. This selects protocol or ANSI X3.28 communication protocol. This parameter will not appear if your Series 920 does not have communications.

Range: STX or XON Represents the device identification number as required for the ANSI X3.28 communications

protocol for the Series 920. This parameter will not appear if your Series 920 does not have communications.

Range: 0 to 9

Allows for specific groups of parameters to be unaffected by the UP/DOWN and ENTER keys,

preventing these parameters from being changed accidentally. 0 = No lock, full access of all parameters.

1 = Prevents user from editing all parameters except the SYSTEM parameter group, the LOCK

parameter, the STEP and FILE parameter in the PROGRAM and

2 -Prevents user from editing all parameters except

and the LOCK, STEP and FILE parameter are in the PROGRAM and

Range: 0 - 2

Allows the operator to clear a file of the Series 920. Press ENTER, and choose the FILE? to clear.

Range: 1 - 10

From RETURN, you can go back to the SYSTEM prompt by pressing the ENTER key, or return to SPCLFUNC by pressing the MODE key.

Default: STX

Default: 0

Default:

COM

has been selected as

Refer

to the 920 Data Communications Manual.

ER1

ER2, & ALRM

pre-RUN

groups.

in the SYSTEM menu,

pre-RUN

XON/XOFF

menus.

XON,

or if

WATLOW Series

920 User’s Manual

How To

Proqram

the Series

920,

Chapter 6

Page 49

PROGRAM Menu

From the Program menu, you can create your files. There can be up to ten profiles; consisting of a total of 99 steps. You can only choose one step type per step.

Figure 31

PROGRAM Key Flow

Graphics

aa =

7’

Key

MODE Key

ENTER Key

UP/DOWN Key

At the SYSTEM prompt, press @ to continue to PROGRAM mode. Press @ to enter the PROGRAM menu.

Use the

to select

one

of the six step types

NOTE:

Shaded parameters may not appear on your control. These parameters are dependent on how

your control configured. See

Pages 50 - 52 for

lnformation.

To SYSTEM

to return to SYSTEM, or press

to return to the file prompt.

WATLOW

Series

920

User's Manual 49

4949

Page 50

Table 10

PROGRAM Prompts and Description.

PROGRAM

Prompt 1 Description

FILE?

STEP

Current system file to edit.

Select step number to view or edit. prompt. To key and press ENTER.

NOTES:

The Series 920 leaves the factory programmed for a warm start. STOP steps appear as a defautt until you program your 920.

Make photocopies, keep original clean.

change steptype

Press MODE for step-type

use

the increment/decrement

Range

1-10

1-99

Default

Your Settings

EV1 Ev2 RETURN

JUMPLOOP -

JS JC

RETURN

WAITFOR -

WPV WHR

Enter

the Event Output 1 status.

Enter

the Event Output 2 status.

Press the

Enter the step number the 920 will jump to. Enter indicated by JS.

Press the ENTER key to

Press the MODE key to return to the STEP prompt.

ENTER

StepType

number

key to return to the SYSTEM prompt.

Press the MODE key to return to the STEP prompt.

times

the 920

return to

will jump

the

to the step

SYSTEM

prompt

Step-Type

Enter a process variable to compare with the actual temperature.

Enter the hours the 920 will wait relative to the beginning

of the step.

WMN

RETURN

Enter the minutes the 920 will wait relative to the beglnnlng

of the step.

Press the ENTER key to return to the SYSTEM prompt

Press the MODE key to return to the STEP prompt.

AUTOSTART - Step-Type

DAY 1 Enter the number of days for the 920 to wait until HOUR

MIN

RETURN Press the ENTER key to return to the SYSTEM prompt.

AUTOSTART takes place.

Enter the number of hours for the 920 to wait for the

day dock

Enter the number of minutes for the 920 to wait for

day clock before AUTOSTART takes place.

Press the MODE key to return to the STEP prompt.

before

AUTOSTART takes place.

time-of-

Off or ON OFF or ON

1-99

0-100

RAL to RAH 0 - 23 hours 0 - 59

minutes

I I

6days

0 - 23 hours

0 - 59

minutes

---

STOP - Step-Type STOP

RETURN

LINK -

FILE? 1 The RETURN

Press ENTER to Press the ENTER key to return to the SYSTEM

Press the MODE key to return to the STEP prompt.

StepType

Step 1 in the file specified.

Press the ENTER key to return to the SYSTEM prompt. Press the MODE key to return to the STEP prompt

WATLOW

display

the

last step

of the program.

prompt.

current

system file will always link to

Series

920 User’s Manual

1-10

How To Program the

Serles

920, Chapter 6

Page 51

One of three main view step type, program loops, wait ON/OFF, and step duration.

Represents the current SYSTEM file of the Series 920 to be edited or reviewed. Range: 1 to 10 files

Represents the current step of a file of the Series 920 to be edited or reviewed. Range: 1 to 99 steps

level

operating menus. From the PROGRAM menu, you can enter or

for conditions, set points, auxiliary (event) outputs

Default: 1

~~.~~~

:+. . . . . . ..?..

. . . . . . .

:....

EIlIrEzq

.z..

One of six step types under the PROGRAM menu of the Series 920. grammed as a file or a

Represents the temperature that the system will try to achieve in the amount of time

given. This will be done linearly, producing a ramp from a beginning set point to an end

set point. In the RUN mode the SE prompt will appear. This represents the set

endpoint that the Series 920 is to achieve.

Range: RAL to RAH

The number of hours, in combination with the

equal the total step time to achieve the temperature under the

This parameter

Range: 0 to 23 hours

The number of minutes that equal total

Series 920.

TIME under the SPCLFUNC menu.

Range: 0 to 59 minutes

The number of seconds that equal total step time to achieve the temperature of the

Series 920. Under

TIME under the SPCLFUNC menu.

Range: 0 to 59 seconds Represents the rate at which the set point changes in a given time. This parameter only

appears if PRG = RATE. Range: 0.0 -

only

Under the

360.0°F10.0 - 200.0°C

step to achieve or maintain a set point.

Default: Unprogrammed

MIN

and SEC parameters, that

appears if PRG -

Default: Unprogrammed

SETPOINT

Default: Unprogrammed

the SEtPOINT steptype.

Default: Unprogrammed

TlME

under the SPCLFUNC menu.

step time to achieve the temperature of the

step-type. This parameter only appears if PRG

This parameter only appears if PRG

minimum per minute

Default: Unprogrammed

Can be pro-

SETPOINT

step-type.

How To

Program

This auxiliary output Auxiliary outputs can be alarms or events. Range: OFF or ON

This auxiliary output can be an alarm or event. Auxiliary outputs can be alarms or events. Range: OFF or

From RETURN, you can go back to SYSTEM prompt by pressing the ENTER key, or

return

to FILE? by pressing the MODE key.

One of six step types under the PROGRAM menu of the Series 920 that can be

programmed as a step or file.

The Series 920 will jump step to any step within your

to another step in another file. Range: 1 to 99

the Series

920,

Chapter 6

oan

be an alarm or event.

Default: Unprogrammed

Default:

Default

Unprogrammed

You can jump from one step to anothr within a file.

EV1

only appears when

EV2 only appears when

current

file.

WATLOW

Series

AUX1 =

AUX2 =

You cannot jump loop

920 User’s

EV.

Manual

Page 52

The number of

step. 0 - Infinite

Range: 0 to 100

times

number

that the

of jumps.

Default:

Series

920 0

will

jump to the step that was

specified

by the JS

From RETURN, you can go back to the SYSTEM prompt by

return

to FILE? by pressing the

One of six

step types

under the PROGRAM menu of the Series 920 that can be pro-

MODE

key.

grammed to wait for a specific amount of time, or for a Temperature

proceeding Range: RAL to RAH

that the system compares against the process variable, and wait for,

to the next step of the program.

Default:

Unprogrammed

desired

pressing

the ENTER

set point.

key,

before

The hours that the system will wait for relative to when the step began. This is not a

measure of

Range: 0 to 23 hours

Represents

This is not a measure of

Range: 0 to 59 minutes

time-of-day.

Default:

Unprogrammed

the minutes that the syste will wait for,

time-of-day.

Default:

Unprogrammed

relative

to when

the step

began.

From RETURN, you can go back to the SYSTEM prompt by pressing the ENTER key, or return to FILE? by pressing the MODE key.

One of six step types under

grammed

to automatically start at a

the

PROGRAM

certain

menu of the Series 920 that can be

time, depending on the DAY, HOUR, and

pro-

MIN

parameter settings.

Represents the number of days that the 920 waits until AUTOSTART takes time

00:00 is

achieved, one day has gone by.

Range: 0 to 6 days

Default: Unprogrammed

place.

Each

[RETURN 1

LINK

[RETURN

WATLOW

Series 920 User’s Manual

Stands for the hour that the 920 waits for the place. Under the AUTOSTART

Range: 0 to 23 hours

This parameter

represents

before AUTOSTART takes

Range: 0 to 59 minutes

steptype.

Default: Unprogrammed

the minutes that the 920 will wait for on the

Under the AUTOSTART

place.

Default: Unprogrammed

From RETURN, you can go back to the SYSTEM

retum

FlLE?

pressing

One of six step types end of any

file.

the

MODE

key.

under

the PROGRAM menu of the

From RETURN, you can go back to the SYSTEM prompt by retum

to FILE? by pressing th8

One of six step types under

Enter

the number

of the

file

Range: 1 to 10

MODE

key.

the

PROGRAM menu allowing you to link on8 file to another.

that you want to link to from here.

Default: 1

From RETURN, you can go back to the SYSTEM prompt by return to

FlLE?

pressing

the MODE

key.

time-of-day

promptly pressing

To Program

clock

before

AUTOSTART takes

steptype.

Series

920, that will indicate

pressing the

pressing

the Series

time-of-day

clock

the ENTER key, or

the

ENTER

key,

the ENTER key, or

920, Chapter 6

Page 53

Chart

Step

I-

Master

s $‘l’lOP

Step Chart

√◊

Step Type

L-l

SETPOlNT SP

AUTOSTART

STOP

LINK

Make photocopies, keep original clean.

Values

WPV

! I

To FILE?

HR RATE

WHR DAY

Time Events

ON or OFF

WMN

SEC

MIN

EV1

Ev2

Step

0 AUTOSTART

--J

Dl Step Type

STOP LINK

FlLE?

Values

DAY

Time

MIN

Events

ON or Off

u SETPOINT

JUMPLOOP JS

_ WAlTFOR WPV

AUTOSTART

s :ir

_sP

To FILE?

HR RATE

WHR DAY

MIN

WMN HR

SEC

MIN

Evl Ev2

How To Program the Series 920, Chapter 6 WATLOW Series 920 User’s Manual 53

Page 54

Chapter 7

How To Use the Series 920 Alarms

One of the most alarms. The alarms can be automatic signals for process error or temperature

related event-type

To use the alarms to their fullest extent, you need to understand what they are

and what they will do. again. Although you may already be aware of the alarms, notice how these parameters interact.

versatile features

actions

in your system.

Here’s an

of the

Watlow

overview

Series

of the different

920

is its capability for

alarm

parameters

Alarm Relay Configuration

Series 920 alarm relays are configured to de-energize when the ACTUAL value is beyond the alarm limits. temperatures are “OK.” That the control.

Normally

way

open contacts are thus closed when

alarm

conditions exist if power is lost from

Number Of Alarms

There are two alarms in the Series 920,

indicate an alarm condition, or a de-energized alarm relay with a flashing “ALMX

XX”

in the alphanumeric display. By retaining the previous alarm condition, an operator absent from the control panel can be aware that an alarm occurred. We’ll look more closely at that later in this chapter.

ALARM

1 and ALARM 2. They

indication

of a

WATLOW

Series 920 User’s Manual

How To Use The Alarms, Chapter 7

Page 55

Alarm Types

There are three Alarm Types for each alarm. ALTYPl and ALTYP2 are the

prompts for Alarm 1 and Alarm 2, respectively. The choices are:

alarm

(P),

or Deviation alarm (D).

For review, a “process” type alarm is one that is set at a fixed degree distance, either positive or negative, from the mean type alarm is always a fixed degree distance, positive or negative, from Set

Point (SP).

If we change SP, a process type alarm remains where it was originally set,

while a deviation type alarm will shift with SP the same number of degrees as

its value. The examples illustrate a plot of each alarm type.

Here we’ve added a process alarm function to the basic graph.

O°F

O°C.

Process

A “deviation”

Figure 32

SP1

,.................. . . . .

Actual

0°C

This graph shows a deviation alarm setting, and how it shifts with a change in SP.

Temp

/---

Deviation Alarm - Fixed Degree distance from

. . . . . . .. . . . .

Time

. . . . . .

Fixed Distance

from

O°

,.I

SP*

New SP

Alarm Type Alarm 1 is

alarm

Figure 33 Alarm

Alarm 1 is a

tion”

(ALTYP=D).

for

“process”

(ALTYP =P)

Type for

alarm

“devia-

SPl

Actual

Time

How To Use The Alarms, Chapter 7

WATLOW Series 920

User's

Manual 55

Page 56

The Operating Band

Now we need to set the alarm limits. In doing so, you’ll define an “operating

band” where you want system temperature (or your controlled variable) to be “OK” and alarm-free.

Table

11 -

Operating Band

Limits

and Ranges.

By selecting an alarm type (ALTYP), and then the alarm limits define the Operating Band. The extreme limits of the Operating Band are defined by the 920s high and low ranges, see the table below.

The following limits are enabled when default values.

value will also change to the

4-20mA,

value.

the process alarm value will change to their default value.

RAL

RAH

RAL

RAH

are changed, the corresponding process

RAL/RAH

are changed, the deviation alarm value will change to its default

RAL

and

value.

RAH

are at their maximum

If the input type is 0-5VDC or

(AXL, AXH),

alarm

you

WATLOW Series 920 User’s Manual

Page 57

Alarm Limits

You can set up alarm bands with the two available alarms. Each of the two alarms has a high and a low limit point, indicated by the You specify in the Operating Data where you want Al L, Al H,

The first two examples below show one band inside the other. However, you could use Al L-Al H as a band below both set point, and

‘I”

“H” A2L,

A2L-A2H.

designation.

and

A2H.

Temp

A2H AlH

New SP

AIL

. . .

A2L

. .

........................................................................................................

..............

................................................

.............................................................

...

. ..

......

. .

.........

.............................................................

.........................................................................................................................

.............................................................

............................................................

...........................................................

. . .

. . . . . .

. .. .. .

......

........

......

...

..........

. .

. . .

. .

...

. .. .. .

....

...

..............

Time

A2H

AlH

New SF

AlL

Figure 34

Alarm limits for Alarms 1 and 2 with “process” type alarm.

(ALlYPi

=P,

ALTYP2zP)

Figure 35 Alarm limits

f6r

Alarms 1 and 2

with “deviation” type alarm.

(ALTYP=D, ALTYP=D)

Actual

How To Use me

.....................................................

..................................................................

.........................................................

::::::~::::~~:::::::::::::::::::::::::::::

Alams,

Chapter 7

........................................

.......................................

...................................

Time

..................................

...................................

..................................

A2L’

WATLOW

Series

920

U&s hbmal

Page 58

Alarm function is either “latching” or “non-latching.” Latching is a means of

“saving” indication of an alarm event for the operator to clear manually. A

latching alarm requires the operator to manually clear it with the ENTER key when ACTUAL returns to within the limits. A non-latching alarm clears itself automatically when ACTUAL returns to within the limits. It’s your choice.

Here again is the

LAT

Alarms have a

Defines Alarm Function: NLAT = Non latching. Alarm relays are automatically energized when ACTUAL temperature returns to within the operating band (as defined by ALTYP X,

LAT = relays after ACTUAL temperature returns to within the operating band (as defined by ALTYP X.

"LAT”

information from the Operating Parameters:

AXL

and

AXH).

Latching. Requires the ENTER key to manually energize alarm

AXL

and

AXH).

3°F/1.7°C

switching differential.

Clearing An Alarm Message

When a latched alarm condition occurs, the ACTUAL display will flash an alarm code. You can to within the operating band.

While in either the RUN or HOLD mode, press the ENTER key to stop the alarm code from flashing for 5 minutes. This will not clear the alarm. The alarm must be cleared in the SYSTEM menu within the 5 minutes, or the alarm code will flash in the display again.

clear

the latched alarm when the ACTUAL display

value

returns

WATLOW

To clear an alarm, return to the SYSTEM prompt. be displayed. Press the MODE key until the CLR ALRM parameter is displayed. Press ENTER to clear the alarm.

A non-latching alarm cannot be cleared. A non-latching alarm clears itself when the ACTUAL display value returns to within the operating band.

An Alarm And The State Of The Alarm Relay

Simply stated, a flashing alarm on the 920 alphanumeric display indicates the

state of the alarm relay contacts. A flashing alarm means when an alarm condition is present (ACTUAL beyond an alarm limit), then the alarm relay is de-energized.

Series 920 User’s Manual

Press ENTER; SP XXXX will

Page 59

Appendix

Series 920 Specifications

Control

. .

Mode

Microprocessor-based, user selectable modes. Single input, dual control outputs, dual auxiliary outputs. 99 step programmer with up to 10 profiles. Control outputs: User selectable as: Heat, Heat/Cool, Cool, Cool/Heat.

Outputs independent, or related via dead band.

l ON/OFF:

PID

parameters. Proportional band: 0 to (0.0 to Reset: 0.00 to 5.00 repeats per minute. Rate: 0.00 to 5.00 minutes. Rate band: 0 to 7 times proportional band. Cycle time: 1 to 60 seconds.

Deadband:

Auxiliary outputs: User selectable as:

Event per step or alarm.

Process or

l Latching or non-latching.

Separate

3°F (1.7°C)

switching hysteresis.

900°F

50.0°C)

for

0.l° RTD inputs.

±36°F ±20°

deviation

high

and low values per output.

C), ± 20 units.

value per output.

(0 to

500°C),

or 0 to 500 units, 0.0 to

90.0°F

Operator interface

Membrane front panel.

Four digit

LED indication of

MODE, ENTER, UP, DOWN, and RUN/HOLD keys.

Eight character alphanumeric display of operating data.

1/2”

(13 mm)

LEDs

display actual process input value.

°F, °C,

or process variable units.

Input

Thermocouple,

Lead resistance effect for tance will cause less than specification on ohms per double foot for the type and gauge of wire used. Automatic cold junction compensation for thermocouple.

RTD input 2 or 3 wire, platinum, 100 ohms @ (0.003916 ohms/ohms/°C or DIN curve #3850 (0.003850 ohms/ohms/°C Se

lectable Sensor break protection de-energizes control outputs to protect system. Isolated or grounded sensor. Isolated sensors must be used with process inputs or outputs.

100K ohms input impedance for 0-5 volt input.

250 ohms input impedance for 4 - 20mA input.

Operating ranges user selectable.

t/c: K t/c: T t/c: -328 to R tic:

S t/c:

B t/c: 392 to 1°

RTD:

0.1° RTD: -99.9 to 0-5VDC: 4-20mA:

RTD

and electrical process input.

“J”

type thermocouple input:

1°F

error. Refer to the lead wire manufacturer’s

0°C,

2OO ohm

of lead resis-

calibrated to

JIS

in the RTD parameter under the SPCLFUNC menu

32 to

-328 to 32 to

32 to

-328 to

1382°F

2282°F

662°F 2642°F 2642°F

3092°F

1112°F

392.0°F

or 0 to

-200

or -200 to or 0 to or 0 to

or 200 to

or -200 to

or -99.9 to

200.0°C

750°C

1250°C

350°C

145O°C 1450°C 1700°C

600°C

-99 to 1800 units

curve

WATLOW Series

#3916

920 User’s Manual

Page 60

Offset of input signal, ±9.0°F (±5.0°C)

°F, °C,

or process variable

for

±90°F (±50°C), ±50 PVU’s,

0.l°

units

are user selectable

front panel adjustable

Output - Control (Single or Dual)

Output #2 user selectable as cool action

Solid state relay, Form A,

0.5A @ 24VAC

minimum, 264VAC maximum, 10mA minimum load, opto isolated, zero cross switching. OFF state impedance is 20K ohms minimum

Open collector, switched DC signal provides a minimum turn ON voltage of

3VDC into a minimum 500 ohm load; maximum ON voltage not greater than 32VDC into an infinite load

Electromechanical relay, Form C,

1/8

hp @

115VAC, 125VA piIot

SPDT;

duty @

6A @

115VAC.

115/23OVAC,

6A @

28VDC,

OFF state impedance is

ohms minimum

Triac 15A,

resistive @

23OVAC, 100mA

minimum load, mounted external on rear of case Process,

4-2OmA,

non-isolated, load impedance 600 ohms maximum

Output - Auxiliary

Electromechanical relay, 2

115/230VAC,

115VAC.

6A @

28VDC 1/8

OFF state impedance is 20K ohms minimum

ea;

Form C; #2 Form A, 6A. SPDT: 6A

hp @

115VAC, 125VA

pilot

duty

Accuracy

Calibration Accuracy: ±0.15% of span, ± digit at

77°F ±°F (25°C ±3°)

ambient & rated line voltage ± 10%

Accuracy Span: 1000°F Temperature Stability: ± 2uV°F (3.6uV/°C ambient referred to the input

Voltage Stability: ±0.01% of span / % of rated line voltage

(540°C)

minimum

Agency Approvals

UL recognized,

UL873,

File

#E43684

Terminals

compression type, universal bead screw terminals

Communications

Serial data communications RS-422A or

All operator indication and controls

ANSI X3.28 protocol, or

l Isolated

DB-15

female receptacle

RS-423A (RS-232C

XON/XOFF

compatible)

protocol

Power

120/240VAC ±

18VA

power consumption

Data retention upon power

10%,

50/60Hz ±5%.

failure

via nonvolatile memory.

WATLOW

Operating Environment

Series

920 User’s Manual

30 to

130°F

(0 to

55°C)

0 to 90% RH, noncondensing

Page 61

Series 920 Model Number Breakdown

Control Series 920

Input

#1 output

= =

output

|9|2|O|A|-|

Single channel, microprocessor based, dual output, ramping controller, 99 steps,

Type J, K, T thermocouple, Type J, K, T thermocouple, Type R, S, B thermocouple

Solid state relay, Form A, Switched DC, open collector, non-isolated

Electromechanical relay, Form C, 6A (Warranted to 100,000 cycles only)

Triac, 15A,

Process,

None Solid state relay, Form A, Switched DC, open collector, non-isolated

Electromechanical relay, Form C, 6A (Warranted to 100,000 cycles only)

resistive, external

4-20mA,

non-isolated

0-5VDC, 1° RTD

4-20mA, 0.1° RTD

0.5A,

RC Suppression

0.5A, RC

suppression

1/4

DIN.

|o|o|

Communications

A = None

B =Isolated

RS-422/RS-423

WATLOW

Series 920 User's Manual 61

Page 62

Figure 36

Type J, K, or T Reference Compensator-to-Series 920

Connection Diagram.

J, K, & T Thermocouple Field Calibration Procedure

Equipment Required

T/C calibrator set at Type

“J”, “K”,

0°C/32°F.

Type

“J”, “K”,

4-1/2

digit Digital Voltmeter (DVM).

Setup and Calibration

NOTE:

Before calibration on an installed control, make sure all data and parameters are documented.

Connect the input side of the thermocouple reference compensator, or output of the T/C calibrator to #6 Positive and #8 Negative on the Series 920 terminal strip. Short the output side of the compensator and turn on the compensator. See Figure 36.

5 (-)

0°C/32°F OR

“T”

Reference Compensator with reference junction at

“T”

T/C extension wire.

Series 920

Omega Model

MCJ-J

Open

Test

( )

(-)

Terminal

I I

Strip

WATLOW Series 920 User’s Manual

Copper Wires

Connect AC line voltage, Ll to

Set DIP switch #8 to ON. Apply power to the unit and for 15 minutes. The unit should be in the TEST mode.

Using the MODE key, advance until the INX parameter appears on the alphanumeric display. Using the UP/DOWN keys, advance to the thermocouple input type. Press the ENTER key.

Connect DVM common to TP84 and DVM positive to TP36 on the

1703 circuit board, (right most board) located on the top side behind the center chassis support. DVM should be set up for DC volts, and in a range capable of displaying 32.00 & 1

Press the MODE key until HOF

(The decimal will not appear on the display of your control.) Use the UP/

DOWN keys to adjust the alphanumeric display to match the reading on the

DVM. Once the two readings match, press ENTER.

Press the MODE key until parameter CJO

unit is now calibrated for Type J, K, and T

seconds for the unit to stabilize. The process reading on the ACTUAL display

should be

Remove power from the Series 920. Remove thermocouple wires from

and

#17,

0mV.

XX.XX

32°F (0°C).

#8.

Turn off the compensator. Set

T/C Wires

L2 to

#20,

ground to

appears on the alphanumeric display.

XXXX

appears. Press ENTER. The

themocouple

DIP

Switch #8 to the OFF position.

#21.

allow

it to warm up

AOO7-

inputs. Allow 10

Appendix

Page 63

R, S, & B Thermocouple Field Calibration Procedure

Equipment Required

Type

“R”

Reference Compensator with reference junction at 0°C/32° T/C calibrator.

Type

l Copper wire.

Precision Millivolt Source.

Setup and Calibration

Before calibration on an installed control, make sure all data and parameters are documented.

Connect the precision millivolt source to Terminals #6 and below.

F OR

“R”

T/C Extension Wire.

NOTE:

Series 920

Terminal Strip

#8.

See the figure

Figure 37

Type

"R"

Reference

Compensator-to-

Series 920 tion Diagram.

Connec-

2.3.Connect AC line voltage, L1 to

#17,

L2 to

#20,

ground to

#21.

Set DIP switch #8 to ON. Apply power to the unit and allow it to warm up for 15 minutes. The unit should be in the TEST mode.

Using the MODE key, advance until the IN

alphanumeric display. Using the UP/DOWN keys, advance to the

parameter appears on the

“R”

thermocouple input type. Press the ENTER key.

5.6.Press the MODE key until the Set the precision millivolt source for an output of 0.000 millivolts,

ATZ

prompt will appear.

(32°F/0°C).

Allow 10 seconds for the control to stabilize, and press ENTER.

Press the MODE key, the ATG prompt appears in the alphanumeric display.

Set the precision millivolt source for an output of 16.035 millivolts, 1400°C).

Allow 10 seconds for the control to stabilize and press ENTER.

(2552°F/

Disconnect the millivolt source and connect the input side of the thermocouple reference compensator, or output of the T/C calibrator, to #6 Positive and #8 Negative on the Series 920 terminal strip.

Connect the reference compensator to the 920. See Page 62, Figure 37.

Turn the compensator ON. Allow 10 seconds for the control to stabilize. Press the MODE key, advance until the CJ prompt appears in the display, press ENTER. The unit is now calibrated for R, S, and B T/C units.

11.

Remove power from the Series 920. Remove the T/C wires from #6 and

#8.

Turn off the compensator. Set DIP switch #8 to the OFF position.

Appendix

WATLOW

Series 920 User's Manual 63

Page 64

RTD

Field Calibration Procedure

Equipment Required

100 ohm precision decade resistance box with 0.00 ohms resolution.

4-1/2

digit, digital voltmeter (DVM).

Setup and Calibration

NOTE:

Before calibration on an installed control, make sure all data and

ters are documented.

Connect the precision decade box to #1 , terminal

strip as shown in the figure below.

#2,

and #3 of the Series 920

Series

920

Terminal Strip

parame-

Figure 38 -

Decade

Box-to-Series 920

Connection Diagram

Resistance

@)(sJ(g;

General Radio Model

Connect AC line voltage, L1 to

Set DIP switch #8 ON. Apply power to the Series 920 and allow it to warm up for 15 minutes. The unit should be in the TEST mode.

Using the MODE key, advance until the IN X parameter appears in the

4. alphanumeric display. Using the UP/DOWN keys, advance to your correct

RTD

input type. Press the ENTER key.

Connect DVM common to TP84 and DVM positive to TP36 on the

5. 1703 circuit board. Located on the top side behind the center chassis

support. displaying 32.00 millivolts ± 1

DVM should be set up for DC volts, and in a range capable of

#1433-T

#17, L2

0mV.

#20,

ground to

#21.

AOO7-

WATLOW Series 920 User’s Manual

Page 65

Press the MODE key until the HOF

XX.XX

parameter appears on the

alphanumeric display. (The decimal point will not appear on the display of

your control.)

Use the UP/DOWN keys to adjust the alphanumeric display on the 920 to match the reading on the DVM. Once the two readings match, press the ENTER key.

Press the MODE key until ATZ

XXXX

appears on the alphanumeric

display. Set the precision decade box to the correct LOW setting from

Table 12 that corresponds to the type of 920 unit you have. Allow 10 seconds for the unit to stabilize and then press the ENTER key.

Press the MODE key until ATG

XXXX

appears on the lower display. Set the precision decade box to the correct HIGH setting from Table 12 that corresponds to the type of 920 that you have. Allow 10 seconds to stabilize and then press the ENTER key. The unit is now calibrated for

Remove power from the Series 920. Remove wires from

Set DIP Switch

to the OFF

position.

#2,

RTD.

and

#3.

NOTE:

For a DIN curve

RTD, enter

SPCLFUNC

and use the

key to advance to

the

RTD

Select

the

MODE

parameter.

DIN.

Table 12

RTD

Calibration

Settings

for

JIS

WATLOW Series

920 User’s

Manual 65

Page 66

Process Field

Calibration

Procedure

Equipment Required

4-1/2

digit, digital voltmeter (DVM).

Precision voltage/current source.

Set-up and Calibration

NOTE:

Before calibration on an installed control, make sure all data and parame-

ters are documented.

Connect the voltage/current source to #4 Positive and #5 Negative on the Series 920 terminal strip. See the figure below.

Series 920

Terminal Strip

Figure 39 Voltage/Current Source to Series 920

Connection

Diagram

Voltage/Current

Source

Connect AC line voltage, L1 to

#17,

L2 to

#20,

ground to

#21

on the Series

920 terminal strip.

Set DIP switch #8 ON. Apply power to the 920 and allow it to warm up for 15

minutes. The unit should be in the TEST mode.

Using the MODE key, advance until the IN X parameter appears on the alphanumeric display. Using the UP/DOWN keys, advance to the correct input type. Press the ENTER key.

Connect DVM common to TP84 and DVM positive to TP36 on the

AOO7-

1703 circuit board. Located on the top side behind the center chassis support. DVM should be set up for DC volts, and in a range capable of displaying 32.00 ± 10mv.

Press the MODE key until HOF

XX.XX

appears on the

alphanumeric display. (The decimal point will not appear on the display of your control.) Use the UP/DOWN keys to adjust the alphanumeric display on the 920 to match the reading on the DVM. Once the two readings match, press the

ENTER key.

WATLOW Series 920 User’s

Press the MODE key until MA2 XXXX appears. input type, or 4mA for a

4-20mA

input type. Press the ENTER key.

Input 0 volts for a

0-5

volt

Allow

10 seconds for the unit to stabilize.

Press the MODE key until MAG

input type, or 20mA for a

XXXX

4-20mA

appears. Inpuy 5 volts for a 0-5 volt

input type. Press the ENTER key. The unit is now calibrated for process inputs. Allow 10 seconds to stabilize. The process reading on the ACTUAL display should be sitting at the RAH setting.

Remove power for the Series 920. Remove wires from #4 and

#5.

Set DIP

Switch #8 to the OFF position.

Manual

Appendix

Page 67

Glossary

This glossary includes general thermal system

ACCESS( ):

Actual display data:

Alarm:

ALTYP1 :

ALTYP2:

Antireset:

Automatic Prompts:

In the SETUP menu of the Series 920, an ACCESS number (0, 1, 3,5)

must be selected to enter the personality of your Series

920 into the ters.

Displayed information which gives the operator/programmer real or “Programmed display data.”

A condition generated by the process has exceeded or fallen below the limit point.

Present Determines whether the alarm type for Auxiliary Output 1 will

be a process alarm or a deviation alarm.

Present only when Determines

be a Process alarm or deviation alarm. Control feature that inhibits automatic reset action outside of

the proportional

Data entry points where a

“prompts” or asks the operator/programmer for information

input.

CALIB, PID,

"actual”

data, i.e., actual process temperature. See

only

when

AUX1 =

AUX2 =

whether the alarm type for Auxiliary Output 2 will

band.

control

MANUAL, and SPCLFUNC

Series

AL and DIP switch #7 is ON.

microprocessor-based

terms.

parame-

920, indicating that the

control

AUTOSTART

AUX1 :

AUX2:

A1H:

Al L:

A2H:

A2L:

One of six step types under the PROGRAM menu of the Series

920 that can be programmed to automatically start at a certain time, depending on the DAY, HOUR, and settings.

This parameter

an alarm or event output for the Series 920. Not displayed if

DIP switch #7 is ON. This parameter

an alarm or event output for the Series 920. Not displayed if

DIP switch #7 is ON.

When

’

AUX1 = representing the high process alarm or high deviation alarm for Alarm

This parameter represents the low process alarm or low deviation when AUX1 = AL.

Represents the high process alarm or high deviation alarm for

Alarm 2 of the Series 920.

The low process alarm or low deviation alarm for Alarm 2 of the

Series 920.

detemines

AL, the Series 920 will display this parameter

alarm

for Alarm 1 of the Series 920. Displayed only

Displayed only when

whether Auxiliary Output 1 will be

whether Auxiliary

Displayed only when

AUX2 =

MIN parameter

Output

AUX2 =

AL.

2 will be

AL.

CAL:

An offset of the process variable. This number is added to the value that the system derives. The final result is used for the set point as well as a front panel indication.

WATLOW Series

920 User’s

Manual

Page 68

CALIB:

When ACCESS (0) is entered under the SETUP menu, the CALIB

parameters appear. These parameters setup the

Real

Time and the calibration offset of the process variable.

C/F/U:

Closed loop:

CLR

FILE: Cold junction: Cold junction

compensation:

Cold start:

COM:

COM

ID:

Accepts the sensor input and

scales

it to degrees Celsius,

Fahrenheit, or Units of measure. This parameter will not appear

if DIP switch #7 is ON. Control system with a sensing device for process variable

feedback. Allows the operator to clear a file of the Series 920.

Point of connection between

thermocouple

metals ands

the

electronic instrument.

Electronic means used to compensate for the effect of the

temperature at the cold junction.

"Clean”,

or completely cleared-of-user-program-information,

start-up condition. (Factory settings.)

This parameter determines whether the communications

protocol will be STX/ETX or XON/XOFF. This parameter can be found in the SPCLFUNC menu. This parameter will not

appear if you do not have communications.

Represents the device identification number

ANSI X3.28

parameter will not appear if you do not have communications.

communications protocol for the Series

as required for the

920. This

CT C:

CT H:

Cycle time:

DAY:

DB:

Dead band: Derivative:

The Cooling Cycle Time expressed in seconds for a controller to complete one ON/OFF cycle. The time between turn ons. This parameter PB C = 0, 2. Your Series 920 has a CL or

CL/HT.

will not appear if: 1.

4-20mA

successive

OUT =

HT,

output and OUT

The Heating Cycle Time usually expressed in seconds for a controller to complete one ON/OFF cycle. Time between successive turn ons. This parameter will not appear if: 1. OUT

= CL,

or PB H = 0, 2. Your Series 920 has a

and OUT = HT or

HT/CL.

4-20mA

output

The time necessary to complete a full ON-through-OFF period

in a time proportioning control system. Represents the number of days that the 920 waits until AUTO-

START takes place. Each time

0O:OO

is achieved, one day has

gone by.

The Dead Band parameter representing the area where no

heating or cooling takes place in a

heat/cool

proportional

control. This parameter will not appear if OUT = HT or CL. A temperature band between heating and cooling functions. Anticipatory action that senses the rate of change of tempera-

ture, and compensates to minimize overshoot and undershoot. Also “rate.”

WATLOW Series 920 User’s Manual

Page 69

Deviation:

The difference between the value of the controlled variable and

the value at which it is being controlled.

Default parameters:

DIP switch: DIN:

Display capability:

Droop:

Duty cycle: ER1:

The parameters, or programmed instructions, which are permanently stored in microprocessor software to provide a data base.

A Dual In-line Package switch.

Deutsche Industrial Norms, a widely-recognized

German

standard for engineering units.

In a digital

indicating

instrument, the entire span that can be

indicated if fully utilized.

The difference in temperature between set point and stabilized

process temperature. Percentage of “load ON time” relative to total cycle time.

ER1

(Error 1) is

down. When the Series 920

and your program

considered

stops

a fatal error; your system will shut

shuts down, all events turn off,

running. When an

error

occurs,

ER1 OOXX alternately flashes with the parameter you are presently on. While in either

the RUN or HOLD

mode, press

ENTER to

stop the display from flashing the error code. This will not clear

the

error,

but stops the

To clear an

ER1

parameter. This clears your error unless it is a

error, return

error

code from flashing

the

SYSTEM

for 5 minutes.

mode

and ENTER the

reoccuring

error and has not been resolved.

ER2:

Events:

EV1 &

EV2:

FILE:

GS:

ER2 (Error 2) is considered non-fatal. mode, your program continues running unless it is a error. ER2

00XX

appears, and alternately flashes along with

If you are in the RUN

program

the parameter that you are presently on. While in either the

RUN or HOLD mode, press ENTER to stop the display from flashing the error code. This will not clear the error, but stops the error code from flashing

for 5

minutes. Clear an ER2 parameter under the SYSTEM mode. If the error persists, refer to the

Error

Code list on Page 78 to clear.

An event is an ON/OFF auxiliary output relay signal. You can

use events, based on time, temperature, or other process variables, to trigger peripheral equipment or process.

These auxiliary outputs only appear when

can

be alarms or events.

AUX1

and AUX2 = EV respectively. You

EV1

and EV2

can change the state of the events only in the HOLD mode. Auxiliary outputs can be

alarms

or events.

Represents the current SYSTEM file of the Series 920 to be

edited or reviewed.

Under the LINK parameter, FILE? stands

for the file that you want to link to. The Guaranteed Soak parameter guarantees that the actual

temperature is being controlled within a window around set point. If exceeded, the step time clock will stop until the actual temperature is within the soak window.

HIPWR:

Selects the maximum percent of power the Series 920 will

output.

Will

not appear if DIP switch #7 is ON.

Appendix WATLOW Series

920 User’s

Manual

Page 70

HOUR:

The HOUR parameter has three meanings, depending upon

which menu you are in.

Hysteresis:

Hunting:

IN:

Input: Integral:

Isolation:

JC:

PROGRAM menu - The number of hours, in

the

MIN

and SEC parameters, that equal the total step time to

achieve the temperature.

Under the AUTOSTART step type, the hours that the 920 will

wait for the time-of-day clock before AUTOSTART takes

SETUP menu - Represents the SYSTEM 24 hour clock. Midnight = 0 hours.

ON/OFF

change the output from full ON to full OFF. Oscillation or fluctuation of process

point and process variable.

Represents the input parameter. Selects the type of sensor

used as an input. Will not appear if DIP switch #7 is ON.

Process variable information being

Control action that automatically eliminates offset, or “droop”, between set point and actual process “reset”.

Electrical separation of sensor from high voltage circuitry. Allows for application of grounded or ungrounded sensing

element. The Jump Count parameter represents the number of times

that the Series 920 will jump to a

control, the temperature change necessary to

temperatures

supplied

specified

combination

time-of-day

between set

to the instrument.

temperature.

step.

Also

with

place.

JS:

JUMPLOOP:

LAT:

LINK:

LOCK:

LOPWR:

920

The Jump Step parameter of the Series

step within your current file.

step in another file.

One of six step types under the PROGRAM menu of the Series

920, that can be programmed as a step or a file. You can jump

from one step to another within a file.

Latches your alarm outputs when the Series

condition. Remain energized until you manually clear any

alarms.

Will not appear if DIP switch #7 is ON.

One of six step types under the PROGRAM menu of the Series

920, that allows you to link one file to another.

Allows for specific groups of parameters to be unaffected by the UP/DOWN and ENTER keys, preventing these parameters from being changed accidentally. 0 = No lock, full access of all

parameters. 1 =

except the SYSTEM parameter group, the LOCK parameter, and the STEP parameter in the PROGRAM group. 2

Prevents user from editing all parameters except ALRM

in the SYSTEM menu, the LOCK parameter, and the

STEP parameter in the PROGRAM menu. Selects the minimum percent of power that the Series 920 will

Prevents user from editing

You cannot Jump Step to another

will jump to any

920

has an alarm

all

parameters

ER1

ER2,

output.

WATLOW Series 920 User’s Manual

Page 71

MANUAL:

When ACCESS (3) is selected under the SETUP mode of the Series 920, the MANUAL parameter appears.

MN:

Offset:

ON/OFF control:

Open loop:

Operating

band:

The

MIN

parameter has three meanings depending upon which

parameter you are in. PROGRAM menu - The number of minutes that equal total

step time to achieve the temperature of the Series 920.

Under the AUTOSTART step type in the PROGRAM menu, it represents the minutes that the 920 will wait for on the time-ofday clock before AUTOSTART takes place.

SETUP menu - The SYSTEM 24 hour setting.

Adjustment to actual input temperature and to the temperature values the Series 929 uses for display and control.

Control of temperature about a set point by turning the output full ON below set point and full OFF above set point in the heat

mode.

Control system with no sensory feedback The 920 uses a

closed loop. The area around set point in the Series 920 where ACTUAL

temperature is deemed safe, or “OK”. The band is defined

under ACCESS

Alarm types

CALIB,

A2H, A2L.)

(5),

SPCLFUNC, under the SETUP menu by

(ALTYP1

Alarm

and ALTYP2) and under ACCESS

High and Low Limit Points (A1 H, A1L and

time-of-day

clock

(O),

OUT:

Output:

Overshoot:

PB H:

P control: Parameter:

PD control: PI control:

Select an output type. Action in response to the difference

between set point and process variable. This parameter will

not appear if DIP switch #7 is ON. Action in response to difference between set point and process

variable.

Condition whereby temperature exceeds set point due to initial power up or process changes.

A temperature band expressed in degrees within which a

temperature controller proportioning function is active for

cooling. This parameter will not appear if OUT = HT. A proportional temperature band expressed in degrees within

which a temperature controller proportioning function is active for heating. Expressed in degrees. This parameter will not appear if OUT = CL.

Proportioning control.

A physical property whose value determines the response of

an electronic control to given inputs.

Proportioning control with rate action. Proportioning control with auto-reset.

Appendix WATLOW Series

920

User's

Manual 71

Page 72

PID:

PID

control:

When ACCESS (1) is entered in the Series parameters will appear. These parameters consist of Proportional, Integral (auto reset), and Derivative (rate) actions.

Proportioning control with auto-reset and rate.

920,

the

PID

PRG:

Process

Programmed data:

Proportional

Proportioning control:

PWR:

RAH:

RAL:

Variable:

band:

display

point

and

set

HIPWR

parameters.

default

values are also

default values

are also

This parameter

ramp as a function of time or ramp rate.

Thermal system element to be regulated, such as time

temperature, relative

Displayed information which gives the operator/programmer the “programmed” or intended process information, i.e., intended set point, intended aiarm limit, etc. See displayed data”.

The span of temperature about the set point where time proportional control action takes place.

See Time proportioning control. Allows the operator to control the outputs manually . Full cool is

-100, 0

is cool and heat off, and 100 is full heat. This parame-

ter takes priority over the

Represents a high limit to set point. The the high limits of appear if DIP switch

Represents a low limit to set point. The the low limits of your input type. This parameter will not appear

if DIP switch #7 is ON.

determines

your

whether the

humidity,

etc.

LOPWR

input type. This parameter will not

is ON.

will

"Actual

Rate:

Rate Band:

WATLOW Series 920 User’s Manual

Anticipatory action that senses the rate of change of temperature and compensates to minimize overshoot. Also tive”.

A thermal control band that defines where the rate (derivative function begins. A Watlow rate band occurs centered on set

point at one or more times the width of the proportional band.

The thermal control band for cooling that defines where the

rate (derivative) function begins. This parameter will not

appear if OUT = CL or PBC = 0.

A thermal control band for heating that defines where the rate

(derivative) function begins. This parameter will

OUT = CL or PBH = 0.

Reset (integral) cooling control action that automatically

eliminates offset, or “droop”, between set point and actual

process temperature in a proportional control. Expressed in

repeats per minute. This parameter will not appear if OUT

HT or PBC = 0.

"deriva-

not

appear if

)

Appendix

Page 73

RS H:

A reset (integral) heating control action that automatically eliminates offset, or “droop”, between set point and actual process temperature in a proportional control. Expressed in

minutes. This parameter will not appear if OUT = CL or PB H is set to 0.

RT:

RT C:

RTD:

(parameter)

Reference junction:

Reset:

Reset windup

inhibit: RETURN:

RTD:

Represents the rate at which the set point changes in a given

time. The Rate (derivative) Cooling function

detemined

by how fast the error being corrected is increasing. Expressed in minutes. This parameter will not appear if OUT =

Allows the for different

operator

curves.

to change the input gain of the RTD input

This parameter will not appear if the input

HT,

or PB C = 0.

type is not RTD whole or RTD tenths, or DIP switch #7 is ON The Rate (derivative) for the Heating function that is deter-

mined by how fast the error being corrected is increasing. Expressed in minutes. This parameter will not appear if OUT

CL or PBH = 0.

Synonymous with cold junction. See “Cold junction.” Control action that automatically eliminates offset, or “droop,”

between set point and actual process temperature. Also “integral.

” Synonymous with anti-reset. See “Anti-reset.” From any RETURN parameter, you can go back to SYSTEM.

Resistance Temperature Detector. Resistive sensing device displaying resistance versus temperature characteristics.

Displays positive temperature coefficient.

SE:

Represents the set endpoint that the Series 920 will try to achieve in the amount of time given. This will be done linearly, producing a ramp from a beginning set point to an end set point. Seen only in the RUN mode.

SEC:

The number of seconds that equal total step time to achieve the temperature of the Series 920.

Set point: SETPOINT:

Intended value of the process variable.

One of six step types under the PROGRAM menu of the Series

920. Can be programmed as a file or a step to achieve or

maintain a set point.

SP:

Represents the current Set Point. Its primary function is as the

control point of the closed loop.

SPCLFUNC

When ACCESS (5) is selected under the SETUP mode of the

Series 920, the Special Function parameters appear. Here you

can select the input type, degrees, output type, auxiliary and

alarm types among others.

STEP:

Represents the current SYSTEM file step of the Series 920 to

be edited or reviewed.

STOP:

One of six step types under the PROGRAM menu of the

Series

920, that will indicate the end of any file.

Appendix

WATLOW Series 920

User’s

Manual

Page 74

SYSTEM:

Switching

sensitivity:

One of three main level operating parameters. From the

SYSTEM menu, you can generate a non-ramping set point (fixed), manipulate Events 1 and 2, clear error codes and latching alarms.

In ON/OFF controls, the temperature change necessary to change the Series 929).

output

from full ON to full OFF

(3°F

1.7°C

in the

Thermal System:

Thermocouple:

Thermocouple break protection:

Three

mode

control:

Time proportioning control:

Triac:

A regulated environment consisting of a heat source, heat transfer medium, sensing device and a process variable control

instrument. Temperature sensing device that is constructed of two dissimi-

lar metals wherein a measureable, predictable voltage is

generated corresponding to temperature.

Fail-safe operation that assures output shutdown upon an open

thermocouple

Proportioning control with reset and rate. Represents the

920's

system.

Action which varies the amount of ON and OFF time when “close” to the set point, i.e., in the proportional band. This variance is proportional to the diierence between the set point and the actual process temperature. In other words, the amount of time the output relay is energized depends on the system temperature.

Solid state switching device.

condition.

Real Time hours and minutes of the Series

WATLOW

Series

WAITFOR:

Warm start:

WHR:

WMN:

WPV:

Zero switching:

920 User’s Manual

One of six step types under the PROGRAM menu of the 920 that can be programmed to wait for a specific amount of time, or a process value.

Start-up bered by the instrument’s memory backup

The hour that the system will wait for relative to when the step

began. This is not a Represents the minutes that the system will wait for relative to

when the step began. This is not a measure of time-ofday.

Temperature that the system will compare against the process variable, and wait for, before proceeding to the next step.

Action which provides output switching only at the zero

crossing points of the AC line.

condition

where all program Information is remem-

protection.

measure

time-of-day.

Series

voltage

Page 75

A B

Accuracy, 60 Actual and Alphanumeric Display Area, 12, Fig. 6 Alarms,

Clearing,

Codes, 79

41,45,58,78

Configuration, 54.

Definition, 67 Function, 58 Limits, 57

Relays, 58 Rules, 78

Types, 55

ALTYP1 & 2, 48,67 AUTOSTART Step Type, Auxiliary Output, 27, Fig. 17 AUX1 & AXL,

CAL, Calibration, 62 C/F/U,

Chart Recorder, 33 Clean Input Power, The

Clearing CLR COM,

Combination Differential Common Mode Fitter

Communications, 60

Control Mode, 59

CT C, CT H,

Cycle Time,

CALIB, 45,

Cutout Panel, 25

DAY, 52 Dead Band Default Differential Mode Filter Wiring, 23, Fig. 9 Dimensions,

DIP Switch,

Editing Entering,

Error Codes, Event Outputs, EV1 & EV2,41,51

2,47,67

AXH, 45,67

45,67

12,47,68

Memory, 14 FILE, 48 COM

ID, 48,68

45,46

46,68

(DB), 46,68

Parameters,

Faceplates, Panel Cutout, 25, Fig. 14 Sideview,

Displays, 12 How to Set, Location, 9, Fig. 3 Selection, 9, Table Position, 9 Settings, 36

Operating Data And Operating Parameters,

Chapter 6,36 Real Time of Day, 15

Your

24, Fig. 12

25, Fig. 13

8,15

Program, 17

41,69,78

37,41,51,69

17,52,67

Do’s

and

Don’ts, 21

Filter, 23, Fig.

Wiring,

23, Fig. 10

41,43,44,50,69

1,40

Forward Jump, 38

Front Panel, 12

Glossary, 67 Ground Loops, 22 Guaranteed Soak

HIPWR, 35,48,70 HOUR, How To,

I IN, Index, 75 Input

Intertwined Loop, 39 Installation Procedure, 24

JC, JS, JUMPLOOP,

Keys, 13 Fig. 7

45,51,52

Check for Ground Loops, 22 Install And Wire The Series 920, Chapter Install the Series 920,24 Open the Program the 920, Chapter 6,36 Run the Set DIP Switches, Tune, Chapter Use Alarms, Chapter

Use the Keys and Displays, Chapter 2, 11

Use The Manual, 2

Wire The Series

47,70

Options, 27, Fig. 16

Output Overview, Fig. Power Wiring & Definitions, 20 - 21 Specification, 59

51, 52

Parameter, Rules to Follow, 39

Types, 38

LED’s,

12,33 Line Filtering Configuration, 22 LlNKing

Files,

LOCK,

44,70

LOPWR, 35,48,70 M

MANUAL, Master Step Chart, 53, Chart 1 Mechanical Relay,

MIN, 45,51,52 Model Number, 61 Modes,

46,71

Output 1 Wiring, 29, Fig. 20 Output 2 Wiring, 31, Fig. 26

Overview,1

(GS), 37,48,69

920, 8,

920,19,

5,33

51,70

18,52,70

Fig. 2 Fig. 8

8,15

7,54

920, 25

1,6

4,20

Appendix

WATLOW Series 920 User’s Manual

Page 76

Nested Loop, 39

NLAT,

Alarms, 58 No Output, 30, Fig. 23 Noise, Suppression Device Ratings, 22, Table 7

Open the

Operating,

Operator Interface, 59 OUT,

Output

Packing List, 7 Panel Cutout, 25 PB C & H, 45, PID,45,71, Power,

Preventing Noise, Installation Guidelines, 20

PRG,

Process,

PROGRAM,

Programming, 36

Proportional Band,

PWR,

Quick Reference, 82

RAL &

Rate

RB C & H, 45, 46

Real Time of Day,

Reset

Returns, 77

RTD,

920,

How to, 8, Fig. 2

Band, 56 Environment, 60

Modes,

AUX, Control, 60 Event, 37

Wiring,

Wiring, 26, Fig. 15

Specification,

Calibration, 66 Input, 27, Fig. 16 Variable Unit,

Description, Key Flow, 49 Menu, 49 Prompts, 50 Sample, 14

Calibration, 64 Parameter, 48

10,

47,71

RAH,

(RT),

45,46,51

(RS), 45,46

WATLOW

Fig. 4

4-2OmA,

44,72

Series 920 User's Manual

30, Fig. 22

Sensor Wring, 27 RUN Menu, 79 Running Your Series 920, 19, Fig. 8

Safety

Information, 2 Sample Program, Chapter SEC, 51 Sensor,

lnstallation,

Wiring, 27 Series 920 Input and Output Overview, 6, Fii. 1 Set DIP Switches, How to, 8 Set Point SETUP,

Description, 43 Key Flow, 42 Menu, 42

Prompts45

Shipping Claims, 77 SPCLFUNC, 47 Specifications, 59 SS Relay,

Output 1 Output 2 Wiring,

Switch,

Output 1 Wiring, 28, Fig. 19 Output 2 Wiring, 30, Fig. 25

Steps To Put Your Control To Work, 7 STOP, 52 SYSTEM,

Description, 41

Key Menu, 40

Prompts, 41

System Wiring T

Table of Contents, 3 Terminals, Thermocouple Calibration, 62, 63 Thermocouple Sensor Wiring, 27, Fig. 16 Tuning,

How to, 33

Procedure, 48

Reference, 33

Triac, 15A U

Using,

Manual, 2

Chart Recorder, 33

WAITFOR Step,18,52 Warranty, 77 Where To Go From Here, Wiring, 25

Example, 32, Fig. 27

Power, 26

Input, 27

Auxiliary Output, 27

WHR,

WMN, 52

(SP), 41,51

Wiring,

Flow,

Example, 32, Fig. 27

Output

1,29,

28,

30,

Fig. 24

Fig. 21

Fig. 18

3, 14

10,13,19,35

Appendix

Page 77

Warranty Information

The Watlow Series 920 is warranted to be free of defects in material and workmanship for 36 months after delivery to the first purchaser for use, provid-

ing that the units have not been misapplied. Since Watlow has no control over their use, and sometimes misuse, we cannot

guarantee against failure. Watlow’s obligations hereunder, at Watlow’s option, are limited to replacement; repair or refund of purchase price, any parts which upon examination prove to be defective within the warranty period specified. This warranty does not apply to damage

resulting

from transportation,

altera-

tion, misuse or abuse.

Returning Merchandise

The following procedure applies for any products returned to the factory:

You must call Watlow Customer Service,

Material Authorization (RMA) number before returning any item for repair.

We need this information:

l Ship to address

l Contact name

l Ship via

Symptoms and/or special instructions

Name and phone number of person returning the material.

Bill

to address

l Phone number

l Your P.0.

number

We will not accept a return without an

must appear on the outside of the carton and on all paperwork. Cartons

without

You need prior approval and an RMA number from the Customer

RMA

numbers will be returned. Ship on a freight prepaid basis.

Department when you are returning an unused product for credit. Also, we must apply a 20 percent restocking charge for all returned stock controls and accessories.

After we receive your return, we will enter a repair order, replacement

order, or issue credit for material.

In cases of manufacturing defect, we will return it to you with a letter of explanation.

Repair costs will not exceed 50 percent of the original cost.

507/454-5300,

RMA

number. The

for a Return

RMA

number

Service

Shipping Claims

When you receive your Watlow control, examine the package for any signs of external damage it may have sustained

either outside the box or to its contents, make a daim with the shipper immedi-

ately. Save the original shipping carton and the packing material.

Appendix

enroute.

If there is apparent damage

WATLOW Series 920 User’s Manual

Page 78

Series 920 Error Codes/Alarms

ER1

Error Codes and Actions

Internal RAM failure; consult factory. External RAM failure; consult factory. Bad battery error; consult factory. A/D

conversion error, or input sensor error.

For the input type selected, verify that the

corresponding sensor input is OK, (TC,

RTD, 0-5VDC

OK, consult factory.

High reference out of limit. Check calibra-

tion procedure. If not OK, consult factory.

Cold junction offset out of limit. Check calibration procedure. If not OK, consult factory.

RTD gain out of limit. Check calibration

procedure. If not OK, consult factory.

RTD zero out of limit. Check calibration

procedure. If not OK, consult factory.

0-5V/4-20mA

calibration procedure. If not OK, consult factory.

Interpolation/overrange. specification for sensor input range. Ambient temperature overrange. Check speci-

fication for ambient temperature range.

0-5VDC/4-20mA

Frequency/Voltage offset out of limit. Clear in the

SYSTEM menu.

Frequency/Voltage gain out of limit. Clear in the

SYSTEM menu.

Stack overflow error; consult factory.

ER2 Error Codes and Actions

920 transmit buffer overflow.

920 receiver buffer overflow.

Protocol or syntax violation, retransmit. Framing/overrun error. Check baud rate, parity,

stop bits.

Parity error. Check baud rate, parity, stop bits.

Talking out of turn. Protocol violation, retransmit.

6 7

Invalid reply error. Figure out communications, retransmit.

Command not found. Check your program.

Parameter not found. Check your program.

Incomplete command line. Syntax error, retrans-

mit.

Invalid character. Syntax error, retransmit.

Number of characters overflow. Numeric syntax error, retransmit.

Input out of limit. Transmitted value too large or

small, retransmit.

Read only command. Cannot input a value for

that parameter, retransmit.

Write only error. Attempted to read a parameter that can only be written to.

WATLOW

4-20mA).

out of limit. Check

offset out of limit.

Series 920 User’s Manual

If sensor is

Check

Request to run invalid. Verify a run condition. Request to hold invalid. Verify a hold condition.

Command invalid in run mode. Cannot enter values in run mode, retransmit.

Self test mode not active. Check to see that DIP switch #8 is ON.

Number of steps stored is > 99. Enter steps only to 99.

No file found. Check your program, retransmit. No step found. Check your program, retransmit.

37 38

No asterisk input allowed. Follow proper format for entering asterisks.

Infinite

tive loops, retransmit.

File change error. An attempt to resume a

changed file has occurred.

loop

error. Check the number of consecu-

Rules for Error Codes and Alarms

The priority for displaying errors is

ALM.

If an

ER1,

ER2, and an ALM condition occur simultaneously, the ACTUAL display. When the the

ER2

code will flash When the ER2 code is cleared, the ALM message will flash.

The lowest alarm code will take priority in an

ALM condition.

the code with the lowest value will flash. Once the alarm code is corrected in the SYSTEM menu, all alarm codes will be cleared. When two alarm codes occur simultaneously, the alarm with the

highest code will never be displayed. It is possible to read multiple alarms via com-

3. munications. For example, if “ALM2 LO” the front panel since it has an alarm code of 1. But

if the alarms are queried via communications, the result will be 9, which is

4.5The most recent error received will be displayed for an

ER2 20 occurs and is not cleared, then an ER2 20

will be

If an indication will flash on the ACTUAL display. In either the RUN or HOLD mode, press the ENTER key. This stops the display from flashing for 5 minutes. The error, or alarm must be cleared in the SYSTEM menu within five minutes or the condition will continue to flash.

are occurring,

ER1

or ER2 condition. For Example: If an

overwritten

ER1, ER2,

ER1

code will flash on the

ER1

the ACTUAL display.

If two alarm codes are occurring,

“ALM1

ALM1

HI and ALM2 LO.

by ER2 21.

or ALM condition occur, the

ER1,

ER2,

code is cleared,

“ALM1

HI” and

HI” flashes on

Appendix

Page 79

Series 920 Response to Error Codes

ER1

Codes Shut Down Outputs

The Series 920 will shut down its outputs whenever an

ER1

code occurs. An

sents a Series 920 malfunction.

Check These Items First

Anytime you see an these four items first, then follow the recommended

action listed by the code: a) Low line voltage b) Noisy environment, noise event c) Vibration d)

Temperature or moisture over specification

ER2 Codes Do Not Shut Down Outputs

ER2 error codes are data communication system related, or file programming related.

Alarm Messages

ALM1 ALM1 ALM2_Hl

ALM2_LO

HI occurring

_LO occurring

occurring

ER1

code usually repre-

ER1

error code, check for

Alarm Code

1 2 4 8

Clearing an Error Code

To clear an Error Code from the alphanumeric

display, first correct the problem, then return to the SYSTEM menu. Use the MODE keys to reach the ER1

ER2

parameter and press ENTER. ENTER or transmit a 0. the 920 replies to a data communicated “? “? ER2”

query with the same code, the problem still

If the code returns, or if

ER1 ”

exists. Refer to the Series 920 manual or the Series 920 Data Communications Manual.

ER1,

ER2, and ALM can only be cleared

when in the SYSTEM menu.

How to Clear an Alarm Code

An alarm code will alternately flash with the pa-

rameter that you are presently on. value is NLAT, your alarms are non-latching and will

clear automatically when the ACTUAL display

value returns to within the normal operating band.

If LAT =

LAT, the alarms are latching.

First correct the alarm condition and return to the SYSTEM menu . Press the MODE key until you

see the CLR ALARM parameter. Press ENTER to

clear latching condition.

alarms

that are no longer in an alarm

If the LAT alarm

Press

Appendix

SETPOINT

- 00:00:00

To SYSTEM Menu

RUN

One of the three step types will be displayed depending on the type of step

JUMPLOOP, STOP, and LINK step types are immediate, and will not

. . . . . ...” . . . . .

.....

PROGRAMmed.

.....

. . . . . . . . . . .

. . . .

E9!

. . . .

. . . . . . .

WATLOW Series 920 User’s Manual

be visible.

Page 80

Series 920 Quick

Reference

Main Menu

To SYSTEM Menu

SYSTEM Menu

To SYSTEM Prompt

To PROGRAM

To SETUP Menu

PROGRAM Menu

To SYSTEM

Watlow

Controls, 1241 Bundy Blvd. Winona, MN 55987, Phone: :

507/454-5300,

Fax:

507/452-4507

Watlow 920 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Safety Information

General Description

How to Open the 920

How to Set the DIP Switches

Changing the Position of a Switch

Overview of the Three Operating Modes

How to Use the Keys and Displays

Front Panel Information

Actual and Alphanumeric Display Area

Keyboard Area

Enter Real Time of Day

Before Entering Your Program

Programming. File

Running Your Program

Editing Your Program

Adding an AUTOSTART Step Type

Running Your Series 920

Sensor Installation Guidelines

Input Power Wiring

Definitions

How to Check for Ground Loops

Line Filtering Configurations For Controls

Installation Information

Installation Procedure

How to Wire the Series 920

Power Wiring

System Wiring Example

Recommended Tuning Reference

Using A Chart Recorder

Tuning

The LOPWR and HIPWR Parameters

Write Out Your Program

Programming in General

Select the Proper DIP Switch Settings

Event Outputs

Guaranteed Soak

SYSTEM Menu

SETUP Menu

PROGRAM Menu

Alarm Relay Configuration

Number Of Alarms

Alarm Types

The Operating Band

Alarm Limits

Clearing An Alarm Message

An Alarm And The State Of The Alarm Relay

Appendix

J, K, & T Thermocouple Field Calibration Procedure

R, S, & B Thermocouple Field Calibration Procedure

Glossary

Series 920 Error Codes/Alarms