Watlow 942 User Manual

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Page 1

Series 942

TOTAL

CUSTOMER

SATISFACTION

User's Manual

CUSTOMER

SATISFACTION

1241 Bundy Blvd., P.O. Box 5580, Winona, MN 55987-5580, Phone: 507/454-5300, Fax: 507/452-4507

W942-XUMN Rev. R00 June, 1995

Supersedes: W942-MA40-9305

1/4 DIN

Microprocessor-Based

Ramping Control

Watlow Controls Watlow Controls

Watlow Controls

Watlow Controls Watlow Controls

Made in the U.S.A.

$10.00

Printed on Recycled Paper

Page 2

WATLOW Series 985 User's Manual Appendix

Page 3

Page Item

Chapter 1

4 Starting Out With The Watlow Series 942-

4 General Description 5 Opening the 942 5 Set the DIP Switches

Chapter 2

6 How To Install And Wire The Series 942-

6 System Planning 6 Installation Information 7 Dimensional Information 8 Wiring The Series 942 8 Sensor Installation Guidelines 9 Input Wiring 11 Output 1 Wiring 15 Output 2 Wiring 17 Auxiliary Wiring 20 System Wiring Example

Chapter 3

21 How To Use the Keys And Displays

Chapter 4

22 How To Setup The Series 942

22 Entering The Setup Menu 23 Setup Parameters 28 Operation Menu and Parameters

Chapter 5 31 Programming the Seres 942 31 Program Menu

32 Program Parameters 34 Running the Series 942 35 Resume a Profile 36 Event Outputs 37 Multiple Profiles 37 Jumploops 38 Programming a Ramping Profile 38 Running Your Profile 39 Editing Your Profile

Chapter 6

How To Tune and Operate

40 Tuning - Automatic and Manual 42 Changing the Auxiliary Jumper Position 42 Using Alarms 44 Error Code Messages & Actions

Appendix 1

46 Specification 48 Model Number Information

Appendix 2

49 Installation Guidelines For Preventing Noise 51 Eliminating Noise 52 Checking For Ground Loops 52 Noise Suppression Devices Available… 53 Line Filtering Configurations For Controls

Appendix 3

54 Entering the Calibration Menu 56 Calibration Procedures 64 Glossary 66 Index 67 Warranty/Returns

Figures, Tables, Charts Page Item Figure

4 Series 942 Input & Output Overview 1 5 How to Open the Series 942 2 5 DIP Switch Location and Orientation 3 6 Overview of the Series 942 4 8 Series 942 Faceplate Dimensions 5 8 Series 942 Panel Cutout Dimensions 6 8 Series 942 Sideview Dimensions 7 9 120 VAC Power Wiring 8 9 240 VAC Power Wiring 9 10 Thermocouple Wiring Diagram 10 10 RTD Wiring Diagram 11 11 0 - 5 Process Input Wiring Diagram 12 11 4 - 20 Process Input Wiring Diagram 13 12 Solid State Relay, Output 1 Wiring 14 12 DC (Open Collector) Output 1 Wiring 15 13 6 Amp Mechanical Relay, Output 1 Wiring 16 13 4 - 20mA Process, Output 1 Wiring 17 14 0 - 5VDC Process, Output 1 Wiring 18 14 S.S. Relay, w/o contact supp., Output 1 19 15 S.S. Relay, Output 2 Wiring Diagram 20 15 DC (open Collector), Output 2 Wiring 21 16 6A Mechanical Relay, Output 2 Wiring 22 16 S.S. Relay, w/o contact supp., Output 2 23 17 Auxiliary Option 1, 1 - 6 Amp Relay 24 17 Auxiliary Option 2, 2 - 6 Amp Relays 25 18 Auxiliary Option 3, 6 Amp Relay/0-5ret. 26 18 Auxiliary Option 4, 6 Amp Relay/4-20ret. 27 19 Auxiliary Option 5, None/0-5Retransmit 28 19 Auxiliary Option 6, None/4-20mA Retransmit 29 20 System Wiring Example 30 21 Series 942 Keys and Displays 31 22 Entering the Setup Menu 32 22 The Setup Menu 33 28 The Operation Menu 34 31 The Program Menu 35 34 The Run Menu 36 37 Guaranteed Soak Deviation Example 37 42 Auxiliary Jumper Location 38 43 Deviation Alarm Example 39 43 Alarm Display Examples 40 44 Error Code Display Example 41 53 Differential Mode Filter Wiring 42 53 Common Mode Filter Wiring 43 53 Combination Filter Wiring 44 54 The Calibration Menu 45 55 Calibration Parameters 46

Tables

26 Input Ranges 1 27 Setup MenuParameters/Description 2 30 Operation Menu Parameters/Description 3 38 Series 942 Ramp and Soak Profile 4 39 Editing Your Profile, steps 4 - 7 5 52 Noise Suppression Device Ratings 6 57 RTD Settings 7

Charts

35 Master Step Chart 1

Appendix WATLOW Series 985 User's Manual

Page 4

Starting Out

Chapter 1 The Watlow Series 942,

A Microprocessor-Based Control

Figure 1 Series 942 Input and Output Overview.

Single Input Type J, K, T, N, R, S, B, C or Pt2 Thermocouple, RTD or Process

RS-422A, RS423A (RS-232C compatible), or EIA-485 Optional Computer Interface

Dual Outputs-

PID or ON/OFF, User Selectable Output 1

Heat or Cool

Output 1 Auto-tuning (Heat only)

Output 2 Heat, Cool or None

Dual Alarms/Events

Retransmit Output

(Up to 10 Slaves)

Process Set Point

General Description

Welcome to the Watlow Series 942, a 1/4 DIN microprocessor-based ramping temperature control. It is a single input, dual output, auto-tuning control with 24 step program capability and easy fixed set point operation. The 942 accepts a Type J, K, T, N, R, S, B, C or Platinel 2 thermocouple, RTD, or process input. The primary output is heating or cooling, while the secondary output can be heating, cooling or none.

With the Series 942 you can select either PID or ON/OFF for Output 1 or 2. You can input a complete set of PID parameters for both outputs, including proportional band, reset/integral and rate/derivative. You can also select automatic tuning for Output 1 while in the heating mode. By setting either output's proportional band to zero, the Series 942 becomes a simple ON/OFF control with the switching differential selectable under the HYS Setup parameter.

Two optional auxiliary outputs may be alarms or events. An event is an ON/OFF mechanical relay output. Events are based on time, and can trigger peripheral equipment or processes. An optional retransmit output is offered in lieu of one of the auxiliary outputs. Select either retransmit of process variable or set point.

Operator-friendly features include automatic LED indicators to aid in monitoring and setup, as well as a calibration offset at the front panel. The Watlow Series 942 automatically stores all information in a non-volatile memory.

WATLOW Series 942 User's Manual

Getting Started, Chapter 1

Page 5

How to Open the 942

Before going further, open the Series 942 and pull the control chassis from its case. Here's how:

The control chassis fastens to the case with a single standard screw located on the

LOCK

Three strip connector plugs, in the rear of the control chassis, feed power and signals through the back of the case to the terminal strips. These plugs will let go as you pull.

Starting Out Starting Out

Figure 2 How to Open the Series 942.

WARNING:

The front panel screw turns 90 only. Do not apply excessive force or turn the screw more than 90°.

When removing the Series 942 control from its case, pull firmly but gently. When returning the control to the case, be sure you have the top up to match the plugs with the case. The 942 will not fit in the case upside down, but check to be sure it is oriented correctly. Press the unit in firmly, then turn the front panel screw clockwise to secure it. This insures proper electrical contact.

How to Set the DIP Switches

The Watlow Series 942 has a Dual In-line Package (DIP) switch inside the control on the A007-1954 circuit board (middle board). The location of the board and switch appear below. The switches are clearly numbered. When Switch #1 is ON, the Setup parameters can be viewed but not changed. When Switch #2 is ON, it provides battery backup of the Run parameters. When the control leaves the factory, both switches are OFF.

1 Hardware lockout of

Hardware Lockout of

Setup parameters

SETUP Parameters

2 Battery backup of the

Battery Discharge for Storage

Run parameters

(Factory default is OFF)

Control Chassis - Top View

Figure 3 DIP Switch Location and Orientation.

NOTE: The lithium battery has a life of approximately ten years. When the battery expires, Pout and Run are affected (see Chapters 4 & 5). Return the unit to the factory for a replacement.

Getting Started, Chapter 1

WATLOW Series 942 User's Manual

Page 6

Installation

Chapter 2 How to Install and Wire the Series 942

System Planning

This chapter tells you how to install the Series 942. All mounting and wiring information is right here. Because Watlow controls are thoroughly tested and "burned in" before leaving the factory, the Series 942 is ready to install when you receive it.

But before you begin working, read through this chapter to gain an understanding of the entire installation. Consider sensor installation carefully. For detailed information you'll need to look at the noise reduction guidelines in the Appendix of this manual before making your panel cutout.

Installation Information

NOTE: Removing the Series 942 chassis from its case may make mounting easier.

WARNING:

The front panel screw turns 90° only. Do not apply excessive force or turn the screw more than 90°.

The Series 942 mounts in a panel cutout with two brackets, shipped with your control. These brackets hold the case against the front panel. The Series 942 behind-panel dimensions are 3.6" (90 mm) high by 3.6" (90 mm) wide by 6" (152 mm) deep. Figure 5 on the next page shows the dimensions of the front panel bezel. The 942 weighs 2.75 lbs. (1.25 kg) max.

For dimensional and mounting information, including the location of mounting brackets and size of the front panel cutout, see Figures 5 through 7 on the next page. Your panel's thickness can be from 0.06" (1.5 mm) to 0.25" (6.3 mm).

Installation Procedure

Follow this procedure to mount the Watlow Series 942 Temperature Control:

1. Make a panel cutout per the dimensions in Figure 6.

2. Remove the 942 from its case by turning the front panel screw 90° counterclockwise (CCW). Grip the bezel firmly and pull the control chassis out of the case.

3. Place the case in the cutout you just made.

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

5. Tighten the mounting brackets securely against your panel.

WATLOW Series 942 User's Manual

6. Insert the control chassis into its case and press the bezel to seat it. Turn the front panel screw 90° clockwise (CW) to lock the control in place. The hardware installation is complete. Proceed to the wiring section from here.

Install and Wire, Chapter 2

Page 7

3.81" sq.

(97 mm)

Dimensions

3.81" sq. (97 mm)

Figure 4 Series 942 Dimensions.

0.92"

(23 mm)

Your Panel

Thickness

Thickness:

0.06" to 0.25"

0.06 to 0.25

(1.52 to 6.35mm)

(1.524 to 6.35mm)

6.0"

(152 mm)

Bezel

Mounting Bracket

3.622 to 3.653

3.62" to 3.65"

(92.00 to 92.79mm)

(92 to 93 mm)

Panel

Cutout

3.63" X 3.63"

3.625 x 3.625

(92.08 X 92.08 mm)

(92.08 x 92.08mm)

Nominal

(90 mm ± 0.381)

3.62" to 3.65"

(92 to 93 mm)

(97 mm)

3.6" ± 0.015"

3.622 to 3.653 (92.00 to 92.79m

3.8"

Figure 5 Series 942 Panel Cutout Dimensions.

Install and Wire, Chapter 2

NOTE:

All dimensions in inches.

WATLOW Series 942 User's Manual

Page 8

Power Wiring

NOTE: For 50 or 60Hz operation, no adjustment or jumper placement is necessary.

Figure 6 120 VAC Power Wiring.

How to Wire the Series 942

The Series 942 wiring is illustrated by model number option. Check the terminal designation sticker on the control and compare your model number to those

shown here and to the model number breakdown in the Appendix of this manual. Series 942 internal circuits appear "inside" the line drawing of the 942, while

connections and terminal designations appear "outside" the line drawing. All outputs are referenced to a de-energized state. The final wiring figure is a typical system example.

When you apply power without sensor inputs on the terminal strip, the Series 942 displays "- - - -" in the Upper display, and Er7 in the Lower display. This error indicates an open sensor or A/D error. Remove power to the control and connect the sensor properly, see Page 10. All wiring and fusing must conform to the National Electric Code and to any locally applicable codes as well.

Fuse

11 12

120 VAC

L1 L2

Earth Ground

CAUTION:

To avoid potential electric shock, use National Electric Code (NEC) safety practices when wiring and connecting this unit to a power source and to electrical sensors or peripheral devices.

Figure 7 240 VAC Power Wiring.

Fuse

12 13

240 VAC

Earth Ground

Sensor Installation Guidelines

We suggest 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 you want to control. The sensor should be thermally insulated from the sensor mounting.

WATLOW Series 942 User's Manual

Install and Wire, Chapter 2

Page 9

Thermocouple Input

Input Wiring

Model # 942A -

942A -

You must use an isolated or ungrounded thermocouple, if an external device with a nonisolated circuit common is connected to the 4-20mA or 0 - 5VDC output.

Extension wire for thermocouples must be of the same alloy as the thermocouple itself to limit errors.

1 _ _ _ - _ 000 942A - 3 _ _ _ - _ 000 2 _ _ _ - _ 000 942A - 4 _ _ _ - _ 000

Figure 8 Thermocouple Input Wiring.

RTD, 2 or 3 Wire

Model # 942A -

Long lead lengths create electrical resistance. There will be approximately +2°C input error for every 1Ω of lead length resistance, when using a two wire RTD. The resistance, when added to the resistance of the RTD element, will result in erroneous input to the instrument. To overcome this problem, use a three wire RTD sensor, which compensates for lead length resistance. When extension wire is used for a three wire RTD, all three extension wires must have the same electrical resistance. (i.e. same gauge, copper stranded).

2 _ _ _ - _ 000 942A - 3 _ _ _ - _ 000

Jumper #5 to #6

for 2-Wire RTD

4 5 6

Figure 9 2 or 3 wire RTD Input Wiring.

Install and Wire, Chapter 2 WATLOW Series 942 User's Manual

Page 10

Input Wiring

Figure 10 0 - 5VDC Process Input Wiring.

When using a process input such as 0 - 5VDC or 4 - 20mA, the rL and rH settings scale the display to match the measured range of the process signal.

An example of this is: A pressure transducer operates over a range of 0 - 300 PSI, delivering a 4 - 20mA output signal for this range. By setting rL = 0 and rH = 300, the Series 942 now displays a direct reading of pressure.

0 - 5VDC Process Input

Model # 942A - 2 _ _ _ - _ 000 942A - 3 _ _ _ - _ 000

2 3

NOTE: When using a 0 - 5VDC process input, the input impedance is 100KΩ.

Figure 11 4 - 20mA Process Input Wiring.

4 - 20mA Process Input

Model # 942A - 2 _ _ _ - _ 000 942A - 3 _ _ _ - _ 000

A jumper must be installed between Terminals #2 and 3.

1 2 3

NOTE: When using a 4 - 20mA process input, the input impedance is 249Ω.

WATLOW Series 942 User's Manual

Install and Wire, Chapter 2

Page 11

Solid State Relay With Contact Suppression, Output 1

Model # 942A - _ B _ _ - _ 000

Solid State Relay, Form A, 0.5 Amp

External

N.O.

COM.

Solid State Relay With Contact Suppression

Watlow's solid state relay changes state at zero volts, which is "zero-cross switching." They are also optically isolated, which means the output circuitry is energized by infrared light striking a photosensitive device. This results in a virtual absence of electrically generated noise, and provides electrical isolation between the input and output. For use in switching mercury relays or small AC loads. Off state impedance is 20KΩ minimum.

Load

Fuse

L2 L1

Output 1 Wiring

Figure 12 Solid State Relay With Contact Suppression, Output 1 Wiring.

NOTE: This output is supplied with an arc suppression snubber across the output terminals. High impedance loads may remain energized even though the output device is turned OFF.

Switched DC Output (Open Collector), Output 1

Model # 942A - _ C _ _ - _ 000

Switched DC, Open Collector, Non-Isolated

16 17

External

Load

Logic

Switch

Switched DC

Watlow's solid state switch is a low current DC output (open collector) used to switch an external power switching device such as an SSR or an electromechanical relay. The input specifications of the power switching device must match those listed for the SS switch output. The power switching device must provide isolation between the SS switch output and load power since the SS switch output is a non-isolated output. Minimum load resistance is 500Ω. Available current is 22mA maximum. Typical voltage drop across a 1KΩ load is 12 to 19 volts.

Figure 13 Switched DC (Open Collector), Output 1 Wiring.

Install and Wire, Chapter 2 WATLOW Series 942 User's Manual

Page 12

Output 1 Wiring

Figure 14 6 Amp Mechanical Relay, Output 1 Wiring.

NOTE: This output is supplied with an arc suppression snubber across the output terminals. High impedance loads may remain energized even though the output device is turned OFF.

Mechanical Relay, 6 Amp, Form C, Output 1

Model # 942A - _ D _ _ - _ 000

Mechanical Relay, Form C, 6 Amp

COM.

N.O.

17 18

N.C.

Mechanical Relay

The electromechanical relay is an electrical and mechanical device with moving parts. When power is applied to the relay solenoid, contact closure is created through movement of the "common" contact of the relay.

Off state impedance is 20KΩ minimum.

Fuse

External

Load

Figure 15 Process, 0 - 10VDC, Output 1 Wiring.

Process, 0 - 10VDC, Output 1

Model # 942A - _ E _ _ - _ 000

Process, 0-10VDC, Non-Isolated

16 17

External

Load

Process Output

Proportional value determined by the control to balance the sensor input and set point. This value will fall between 0 - 10VDC depending on the thermal characteristics of the system.

Load impedance is 10KΩ minimum.

WATLOW Series 942 User's Manual

Install and Wire, Chapter 2

Page 13

Process, 4 - 20mA, Output 1

Output 1 Wiring

Model # 942A - _

Process, 4-20 mA, Non-Isolated

Process Output

Proportional value determined by the control to balance the sensor input and set point. This value will fall between 4 - 20mA depending on the thermal characteristics of the system.

Load impedance is 600

F _ _ - _ 000

Ω maximum.

17 18

External

Load

Figure 16 Process, 4 - 20mA, Output 1 Wiring.

Process, 0 - 20mA, Output 1

Model # 942A - _

Process, 0-20 mA, Non-Isolated

Process Output

Proportional value determined by the control to balance the sensor input and set point. This value will fall between 0 - 20mA depending on the thermal characteristics of the system.

Load impedance is 600

G _ _ - _ 000

Ω maximum.

16 17

External

Load

Figure 17 Process, 0 - 20mA, Output 1 Wiring.

Install and Wire, Chapter 2 WATLOW Series 942 User's Manual

Page 14

Output 1 Wiring

Figure 18 Process, 0 - 5VDC, Output 1 Wiring.

Process, 0 - 5VDC, Output 1 Model # 942A - _ H _ _ - _ 000

Process, 0-5VDC, Non-Isolated

Process Output

Proportional value determined by the control to balance the sensor input and set point. This value will fall between 0 - 5VDC depending on the thermal characteristics of the system.

Load impedance is 10KΩ minimum.

External

Load

Figure 19 Solid State Relay Without Contact Suppression, Output 1 Wiring.

Solid State Relay Without Contact Suppression, Output 1

Model # 942A - _ K _ _ - _ 000

Solid State Relay, Form A, 0.5 Amp

External

N.O.

COM.

Solid State Relay Without Contact Suppression

Watlow's solid state relay changes state at zero volts, which is "zero-cross switching." They are also optically isolated, which means the output circuitry is energized by infrared light striking a photosensitive device. This results in a virtual absence of electrically generated noise, plus output to input electrical isolation. Off state impedance is nearly infinite and

should be used to switch high impedance non-inductive loads.

Load

Fuse

L2 L1

WATLOW Series 942 User's Manual

Install and Wire, Chapter 2

Page 15

Solid State Relay With Contact Suppression, Output 2

Model # 942A - _ _ B _ - _ 000

Solid State Relay, Form A, 0.5 Amp

N.O.

14 15

COM.

Solid State Relay With Contact Suppression

Ω minimum.

Fuse

External

Load

L2 L1

Output 2 Wiring

Figure 20 Solid State Relay With Contact Suppression, Output 2 Wiring.

NOTE: This output is supplied with an arc suppression snubber across the output terminals. High impedance loads may remain energized even though the output device is turned OFF.

Switched DC Output (Open Collector), Output 2

Model # 942A - _ _ C _ - _ 000

Switched DC, Open Collector, Non-Isolated

Logic

Switch

Switched DC

Watlow's solid state switch is a low current DC output (open collector) used to switch an external power switching device such as a SSR or an electromechanical relay. The input specifications of the power switching device must match those listed for the S.S. switch output. The power switching device must provide isolation between the S.S. switch output and load power since the S.S. switch output is a non-isolated output. Minimum load resistance is 500Ω. Available current is 9mA minimum and 22mA maximum.

14 15

External

Load

Figure 21 Switched DC Output (Open Collector), Output 2 Wiring.

Install and Wire, Chapter 2 WATLOW Series 942 User's Manual

Page 16

Output 2 Wiring

Figure 22 6 Amp Mechanical Relay, Output 2 Wiring.

Mechanical Relay, 6 Amp, Form A, Output 2

Model # 942A - _ _ D _ - _ 000

Mechanical Relay, Form A, 6 Amp

14 15

N.O.

COM.

External

Load

Fuse

L2 L1

NOTE: This output is supplied with an arc suppression snubber across the output terminals. High impedance loads may remain energized even though the output device is turned OFF.

Figure 23 Solid State Relay Without Contact Suppression, Output 2 Wiring.

Mechanical Relay

Ω minimum.

Solid State Relay Without Contact Suppression, Output 2

Model # 942A - _ _ K _ - _ 000

Solid State Relay, Form A, 0.5 Amp

14 15

N.O. COM.

Fuse

External

Load

L2 L1

WATLOW Series 942 User's Manual

Solid State Relay Without Contact Suppression

Watlow's solid state relays change state at zero volts, which is "zero-cross switching." They are also optically isolated, which means the output circuitry is energized by infrared light striking a photosensitive device. This results in virtual absence of electrically generated noise, while providing output to input electrical isolation. Off state impedance is nearly

infinite and should be used to switch high impedance non-inductive loads.

Install and Wire, Chapter 2

Page 17

For more information on alarms, alarm jumper selection and events, see Chapter 6.

Mechanical Relay

Ω minimum.

Mechanical Relay, 6 Amp, Single Form A or B, Auxiliary Output

Model # 942A- _ _ _ 1 - _ 000

Auxiliary Wiring

Figure 24 Auxiliary Option 1 Wiring.

Mechanical Relay, Form A or B, 6 Amp

Output #3

26 27

Load

L1 L2

Mechanical Relay, 6 Amp, Dual Form A or B, Auxiliary Output

Model # 942A- _ _ _ 2 - _ 000

Mechanical Relay, Form A or B, 6 Amp

Fuse

Output #4

Output #3

25 26

Load

Fuse

Load

L1 L2

NOTE: This output is supplied with an arc suppression snubber across the output terminals. High impedance loads may remain energized even though the output device is turned OFF.

Figure 25 Auxiliary Option 2 Wiring.

Install and Wire, Chapter 2 WATLOW Series 942 User's Manual

Page 18

Auxiliary Wiring

Mechanical Relay

Mechanical Relay, 6 Amp, Form A or B/0 - 5VDC Retransmit

Model # 942A- _ _ _ 3 - _ 000

Figure 26 Auxiliary Option 3 Wiring.

NOTE: This output is supplied with an arc suppression snubber across the output terminals. High impedance loads may remain energized even though the output device is turned OFF.

Process, 0-5VDC, Non-Isolated

25 26

Fuse

Load

External

Load

Mechanical Relay, Form A or B, 6 Amp

Output #4

Output #3

Load impedance 10K

Ω mimimum.

Mechanical Relay, 6 Amp, Form A or B/4 - 20mA Retransmit

Model # 942A- _ _ _ 4 - _ 000

L1 L2

Figure 27 Auxiliary Option 4 Wiring.

WATLOW Series 942 User's Manual

Process, 4-20 mA, Non-Isolated

Mechanical Relay, Form A or B, 6 Amp

Output #4

Output #3

Load impedance 600Ω maximum.

External

24 25

26 27

Fuse

Load

L1 L2

Install and Wire, Chapter 2

Page 19

Retransmit Output

When using a retransmit output such as 0 - 5VDC or 4 - 20mA, the rL and rH settings scale the range of the retransmit output.

An example of this is: By setting rL = 0, rH = 1000 and Ot4 = PrOC a process value of 500 will result in a retransmitted signal of 2.5VDC or 12mA.

0 - 5VDC Retransmit, Auxiliary Output

Model # 942A- _ _ _ 5 - _ 000

Process, 0-5VDC non-isolated

Auxiliary Wiring

Figure 28 Auxiliary Option 5 Wiring.

Load impedance 10KΩ mimimum.

4 - 20mA Retransmit, Auxiliary Output

Model # 942A- _ _ _ 6 - _ 000

Process, 4-20 mA, Non-Isolated

External

Load

Figure 29 Auxiliary Option 6 Wiring.

IDC

Load impedance 600

Install and Wire, Chapter 2 WATLOW Series 942 User's Manual

Ω maximum

24 25

External

Load

Page 20

Wiring Example

Figure 30 System Wiring Example

CAUTION:

All wiring and fusing must conform to the National Electric Code NFPA70. Contact your local board for additional information. Failure to observe NEC safety guidelines could result in injury to personnel.

WARNING:

Watlow mercury relays are designed to be used only with resistive loads.

945A-2DD0-A000

942A-1DD0-A000

Temperature Control

Type "J"

Thermocouple

Fuse

Load Power

(+)

(-)Red

7 9

Mercury

Relay for

Control

14 15

16 17

11 12 13

Fuse

Indicator ON

when limit trips

Fuse

ControlPower

120 VAC Earth Ground L1 L2

L1 L2

Terminal Functio

High Limit

Control Power

120 VAC

945A-2DD0-A000

942A-1DD0-A000

1 Not Used 2 Not Used 3 Not Used 4 Not Used 5 Not Used 6 Not Used 7 T.C. + 8 Not Used 9 T.C. 10 L1 240V 11 L1 120V 12 L2 13 Earth Ground 14 N.O. 15 Com. 16 Com. 17 N.O. 18 N.C.

Integral Setpot

Output #2

Output #1

Heat Load

T/C T/C

Process Sensor

WATLOW Series 942 User's Manual

Coil

High Limit Mechanical Contactor

Indicator ON when

limit trips

Limit Sensor

Normally Open

Momentary Switch

140A-16XX-6000 High Limit Control

(-)

(+)TC Input

Install and Wire, Chapter 2

Page 21

Chapter 3 How to Use the Keys and Displays

After 1 minute with no key activations, the control reverts to the process value in the Upper display and the set point in the Lower display, except when in the RUN menu.

Upper Display

Red, 0.56" (14 mm) high, seven segment, four digit LED display, indicating process variable (such as actual temperature) in addition to parameter values, or an open sensor. When powering up, the Process display will be blank for 8 seconds.

Keys/Displays

Figure 31 Series 942 Keys and Displays.

L 1 & L2

When lit, these LED's tell you when Output 1 or 2 is energized. L2 only appears if your unit has a #2 output.

Lower Display

Red 0.56" (14 mm) high, seven segment, four digit LED display, indicating the set point, menu parameters, and alarm or error codes.

UP/DOWN Keys

When pressed simultaneously for 3 seconds, the Setup Menu appears displaying the LOC parameter. At the LOC parameter, continue to press the UP/DOWN keys, and the Calibration Menu will appear.

UP Key

Increases the value of the displayed parameter. A light touch increases the value by one. Hold the key down to increase the value at a rapid rate. New data is self entering in 5 seconds.

DOWN Key

Decreases the value of the displayed parameter. A light touch decreases the value by one. Hold the key down to decrease the value at a rapid rate. New data is self entering in 5 seconds.

HOLD/RUN Key

Pressed once, it clears any latched alarms without altering the HOLD/RUN status. To run or halt a program see Chapter 5 for details.

L3 & L4

When lit, these LEDs indicate an energized alarm or event condition for Output 3 or 4. Only appears on those units with auxiliary option.

MODE Key

Steps the control through the Operating menu; also, automatically enters data changes before proceeding to the next parameter.

Keys and Displays, Chapter 3

Front Panel Locking Screw

Secures or releases the control chassis from its case.

HOLD/RUN LED

Lit when the control is RUNning. When blinking, press the HOLD/RUN key again to begin RUNning.

WATLOW Series 942 User's Manual

Page 22

Setup

Figure 32 Entering the Setup Menu.

Chapter 4 How To Setup The Series 942

Setting up the Series 942 is a simple process. First configure the 942's features to your application in the Setup Menu, enter values in the Operating Menu, and program your control. Use the MODE key to move through the menus and the UP/ DOWN keys to select data. At this point, enter the Calibration menu, and select US or SI under the dFL parameter if necessary. Rate, reset and °F appear with US, and integral, derivative and °C appear with SI. See Appendix III.

Entering the Setup Menu

The Setup Menu displays the parameters that configure the Series 942's features to your application. Enter the Setup Menu by pressing the UP/DOWN keys simultaneously for 3 seconds. The Lower display shows the LOC parameter, and the Upper display shows its current level. All keys are inactive until you release both keys. You can reach the LOC parameter from anywhere except the Run menu. While in the Setup menu, all outputs are OFF.

Use the MODE key to cycle through the menu, and the UP/DOWN keys to select Setup data. You will not see all parameters in this menu, depending on the unit's configuration, model number, and LOC parameter. After stepping through the menu it returns to the control set point parameter under the Operation menu.

Figure 33 The Setup Menu.

NOTE: The rL and rH parameters are used to scale the display for process inputs, and/or will scale the retransmit range for process output. rL and rH also limit the ramge of the set point.

[SP]

Loc In dEC

C_F rL

rH Ot1

HYS1 Ot2

HYS2 Ot3 AL1

LAt1 HYS3 SIL

( ) ( ) ( ) ( )

( ) ( ) ( )

[Set Point]

User lock out Input type Decimal plac

Celcius_Fahrenhei Range lo

Range high Output 1

Hysteresis 1 Output 2

Hysteresis 2 Output 3 Alarm 1

Latching for alarm 1 Hysteresis 3 Silence alarm

= Parameter may or may not appear

depending on control configuration.

( )

Ot4 AL2 LAt2

HYS4 rtd

PtYP gSd

Pout PStr

bAUd dAtA

Prot Addr

LOg Int tAg

( ) ( ) ( )

( ) ( ) ( ) ( )

( ) ( )

( ) ( ) ( )

( ) ( )

( )

Output 4 Alarm Latching for alarm

Hysteresis 4 RTD calibration curv

Program type Guaranteed soak deviation

Power outag Profile star

Baud rate Data bits and parit

Protocol type Address

Logging printout Time interva Variables to transmit

WATLOW Series 942 User's Manual

Setup, Chapter 4

Page 23

Setup Parameters

When you are at the top of the menu, the Series 942 displays the user level of operation in the Upper display, and the LOC parameter in the Lower display.

When you press the MODE key, the value of the next parameter appears in the Upper display, and the parameter appears in the Lower display.

Setup

Lock: Selects the level of operator lockout. Range: 0 - 3 Default: 0

LOC 0: All operating parameters may be viewed or changed. LOC 1: Locks out the PID parameters. Set point, process value and events are the

only visible operating parameters, set point is adjustable in this level. A profile can be viewed, changed, run or halted.

LOC 2: Locks out the PID parameters and the Program menu. Set point, process

value and events are the only visible operating parameters, set point is adjustable. A profile can be run or halted but not viewed or changed.

LOC 3: Locks out the entire Operating and Program menus. Set point and process

value are the only visible operating parameters, set point is not adjustable. A profile can be run or halted but not viewed or changed.

Input: Selects the sensor input type. Only those input types which are compatible with your unit will appear. See the model number information for your type. Chang-

ing this parameter erases all profile steps and defaults them to an End step. Range: J, K (appears as H), t, n, c, r, S, b, Pt2, rtd1, rtd.1, 0-5, 420 Default: J or r

Decimal: Selects the location of the decimal point for all process related data. This

parameter only appears if the In parameter is 0-5 or 420. Range: 0, 0.0, 0.00 Default: 0

LOC

dEC

Celsius _ Fahrenheit: Selects the units of temperature measurement for the control. This parameter only appears if In = T/C or RTD input. Changing this

parameter erases all profile steps and defaults them to an End step. Range: C or F Default: F

Range Low: Selects the low end of the set point range. See the model number

and specification information in the Appendix, and Table 1 on Page 26 for sensor range values. Also used to set the low end of the process input and/or the low end of the range for the retransmit output. 0.0VDC and 4mA represent Range Low (rL) for process inputs and outputs. Process inputs and outputs are linearly scaled between rL and rH. Changing this parameter erases all profile steps and

defaults them to an End step. Range: Sensor range low to rH Default: Low limit of sensor type

Range High: Selects the high end of the set point range. See the model number

and specification information in the Appendix, and Table 1 on Page 26 for your sensor range values. Also used to set the high end of the process input and/or the high end of the range for the retransmit output. 5.0VDC and 20mA represent Range High (rH) for process inputs and outputs. Process inputs and outputs are linearly scaled between rL and rH. Changing this parameter erases all profile steps and

defaults them to an End step. Range: Sensor range high to rL Default: High limit of sensor type

Setup, Chapter 4 WATLOW Series 942 User's Manual

C _ F

Page 24

Setup

Ot1

HYS1

Ot2

HYS2

Ot3

Output 1: Selects the output action for the primary output. Action in response to the difference between set point and process variable. Select ht (heat) for reverse acting or select CL (cool) for direct acting.

Range: ht, CL Default: ht Hysteresis 1: Selects the switching hysteresis for Output 1 when Pb1 = 0 (ON/

OFF). See Page 29 for the Pb1 parameter. Range: 1°F - 999°F 0.1°F - 99.9°F Default: 3°F

1°C - 540°C 0.1°C - 54.0°C 1Unit - 999 Units 0.1 Units - 99.9 Units

Output 2: Selects the output action for the secondary output. Action in response to the difference between set point and process variable. Select ht (heat) for reverse acting or select CL (cool) for direct acting. This parameter only appears if you have a secondary output. If Ot1 = ht: Range: CL, no If Ot1 = CL: Range: ht, no Default: CL

Hysteresis 2: Selects the switching hysteresis for Output 2 when 0 = (ON/OFF) under the Pb 2 parameter. See Page 29 for the Pb2 parameter. This parameter only appears if you have a secondary output. Range: 1°F - 999°F 0.1°F - 99.9°F Default: 3°F

1°C - 540°C 0.1°C - 54.0°C 1Unit - 999 Units 0.1 Units - 99.9 Units

Output 3: Selects Output 3 as an alarm or an event. This parameter only appears if you have at least one auxiliary output. Range: AL, Ent, no Default: AL

AL1

LAt1

HYS3

SIL

Alarm 1: Determines whether the alarm type for Alarm 1 is process or deviation. A process alarm is set at an absolute temperature to prevent over/underrange. This parameter only appears if you ordered auxiliaries with your unit and Ot3 = AL. See Chapter 6 for more information on alarms.

Range: Pr, dE Default: Pr Latching 1: Selects whether Alarm 1 is latching or non-latching. Latching

alarms must be cleared before the alarm output will reset. Non-latching automatically resets the alarm output when the condition clears. This parameter only appears if your unit has auxiliary outputs and Ot3 = AL. See Chapter 6.

Range: LAt or nLA Default: nLA Hysteresis 3: Selects the switching hysteresis for Output 3 and appears if

Ot3 = AL, and your unit has an auxiliary output. Range: 1°F - 999°F 0.1°F - 99.9°F Default: 3°F

1°C - 540°C 0.1°C - 54.0°C 1Unit - 999 Units 0.1 Units - 99.9 Units

SIL: Selects alarm silencing (inhibit) for Output 3. This parameter only appears when AL1 = dE, and Ot3 = AL. For more information see Chapter 6.

Range: On or OFF Default: OFF

WATLOW Series 942 User's Manual

Setup, Chapter 4

Page 25

Setup

Output 4: Selects Output 4 as an alarm (AL) or event (Ent) if Output 4 is an auxiliary output. Selects Output 4 as retransmit of Process (PrOC) or Set Point (StPt) if Output 4 is a retransmit output. Hardware must also be present. Scaling of the retransmit output is determined by rL and rH. Auxiliary Output: Range: AL, Ent, no Default: AL Retransmit Output:

Range: PrOC, StPt, no Default: PrOC Alarm 2: Determines whether the alarm type for Output 4 is process or deviation.

A process alarm is set at an absolute temperature to prevent over/underrange. This parameter only appears if you ordered auxiliaries with your unit and Ot4 = AL.

Range: Pr, dE Default: Pr Latching 2: Selects whether Alarm 2 is latching or non-latching. Latching alarms

must be cleared before the alarm output will reset. Non-latching automatically resets the alarm output when the condition clears. This parameter only appears if Ot4 = AL, and if your unit has alarms. Range: LAt or nLA Default: nLA

Hysteresis 4: Selects the switching hysteresis for Auxiliary 2 and appears if Ot4 = AL, and your unit has an auxiliary output. Range: 1°F - 999°F 0.1°F - 99.9°F Default: 3°F

1°C - 540°C 0.1°C - 54.0°C 1Unit - 999 Units 0.1 Units - 99.9 Units

Ot4

AL2

LAt2

HYS4

RTD: Selects the RTD calibration curve for RTD inputs. This parameter appears if In = rtd or rt.d. JIS = 0.003916Ω/Ω°C, DIN = 0.003850Ω/Ω°C.

Range: din or JIS Default: din Program Type: Selects the program type as time based (ti) or ramp rate (rAtE) in

degrees per minute. Changing this parameter erases all profile steps and defaults them to an End step. Range: ti (time based) or rAtE (ramp rate) Default: ti

Guaranteed Soak Deviation: Guarantees the actual temperature is being con-

trolled within a window around the set point. If this deviation is exceeded, the time clock stops and the lower display alternately flashes gSd and the current parameter until the process variable returns within the window. See Chapter 5 for more information on the guaranteed soak deviation parameter. Example: A guaranteed soak deviation of 3 equals a ± 3° deviation about the current set point. 0 = Guaranteed soak deviation not active. >0 = Active guaranteed soak Range: 0°F - 99°F 0.0°F - 9.9°F Default: 0°

0°C - 55°C 0.0°C - 5.5°C 0 - 99 Units 0.0 - 9.9 Units

Power Outage: Selects the profile status upon power restoration following a power loss. By selecting continue (Cont), your profile continues running from where it was interrupted. HOLd maintains the last set point prior to power loss. Abort (Abrt) quits running the profile, displays OFF in the lower display, and turns off all outputs. When Abrt or HOld are selected, the lower display alternately flashes Pout and the current parameter. rSET (Reset) causes a start from the beginning of your profile. Press the HOLD/RUN key to clear. Range: Cont (Continue), HOLd, Abrt (Abort), rSET (Reset) Default: Cont

rtd

PtYP

gSd

Pout

Setup, Chapter 4 WATLOW Series 942 User's Manual

Page 26

Setup

PStr

bAud

dAtA

Prot

Addr

LOg

Profile Start: Selects whether the profile starts at the current set point value or the current process value.

Range: Proc or StPt Range: StPt Baud: Represents the current baud rate for serial communications. This

parameter appears if your Series 942 has communications.

Range: 300, 600, 1200, 2400, 4800, 9600 Default: 1200 Data: Allows the user to select the data bits and parity for communication.

This parameter appears if your Series 942 has communications. Range: 7 o = 7 data bits and odd parity Default: 7 o

7 E = 7 data bits and even parity 8 n = 8 Data bits and no parity

Protocol: Selects the communication protocol. This parameter appears if your Series 942 has communications. FULL = ANSI X3.28 2.2 - A.3 On = XON - XOFF

Range: FULL or On Default: FULL Address: Selects the address for this unit if Prot = FULL. This parameter

appears if your Series 942 has communications.

Range: 0 to 31 Default: 0 Log: Selects the data logging function for a printout of the data. This parame-

ter appears if your Series 942 has communications, and Prot = On. Range: On or OFF Default: OFF

Int

tAg

NOTE:

* b t/c: Useable range is suggested to be 1598 to 3092°F

or 870 to 1700°C.

Range is at 32° to allow using at low temperatures without range low sensor errors.

Interval: Selects the time interval for the logging function This parameter

appears if your Series 942 has communications, Prot = On, and Log = On.

Range: 0.0 to 60.0 minutes Default: 0.0 Tag: Selects what variables are to be transmitted out during the data logging

function. This parameter appears if your Series 942 has communications, Prot = On, and Log = On. P = Process S = Set Point A = Auxiliary Status Range: PSA, PS-, P-A, P--, -SA, -S-, --A, --- Default: ---

Table 1- Input Ranges

Input Type Sensor Range Low Sensor Range High

J32°F/0°C 1382°F/750°C K (appears as H) -328°F/-200°C 2282°F/1250°C t -328°F/-200°C 662°F/350°C n32°F/0°C 2282°F/1250°C Pt2 32°F/0°C 2543°F/1395°C c 797°F/425°C 4200°F/2315°C r32°F/0°C 2642°F/1450°C S32°F/0°C 2642°F/1450°C b *32°F/0°C 3092°F/1700°C rtd (1°) -328°F/-200°C 1112°F/600°C rt.d (0.1°) -99.9°F/-99.9°C 392.0°F/200.0°C 0-5 (VDC) -5.00/-50.0/-500 35.00/350.0/3500 420 (mA) -5.00/-50.0/-500 35.00/350.0/3500

WATLOW Series 942 User's Manual

Setup, Chapter 4

Page 27

Use this page as a master copy for configuring your Series 942.

Do not enter any values here; make photocopies instead.

Table 2 Setup Menu Parametersand Descriptions.

Setup

Setup Parameters Value Range Factory Default

LOC 0 to 3 0 In J, K (appears as H), t, n, c, r, S, b, J or r

Pt2, rtd1, rtd.1, 0-5, 420 Dependent on model number.

dEC 0, 0.0, or 0.00 0

Dependent on input type.

C _ F C or F F

Will not appear if In = 0-5 or 420.

rL rL to rH Input selection dependent. rH rH to rL Input selection dependent. Ot1 ht or CL ht HYS1 1°F - 999°F, 1°C - 540°C, 1U - 999U 3°F

0.1°F - 99.9°F, 0.1°C - 54.0°C, 0.1U - 99.9U

Ot2 ht, CL or no CL HYS2 1°F - 999°F, 1°C - 540°C, 1U - 999U 3°F

0.1°F - 99.9°F, 0.1°C - 54.0°C, 0.1U - 99.9U

Ot3 AL, Ent or no AL AL1 Pr or dE Pr LAt 1 LAt or nLA nLA

Dependent on AL 1 = Pr or dE.

HYS3 1°F - 999°F, 1°C - 540°C, 1U - 999U 3°F

0.1°F - 99.9°F, 0.1°C - 54.0°C, 0.1U - 99.9U

SIL On or OFF OFF Ot4 AL, Ent, no, PrOC or StPt AL or PrOC AL 2 Pr or dE Pr

LAt 2 LAt or nLA nLA HYS4 1°F - 999°F, 1°C - 540°C, 1U - 999U 3°F

0.1°F - 99.9°F, 0.1°C - 54.0°C, 0.1U - 99.9U

rtd JIS or din din PtYP ti or rAtE ti

gSd 0 - 99°F, 0 - 55°C, 0 - 99U 0

0.0 - 9.9°F, 0.0 - 5.5°C, 0.0U - 9.9U

POUt Cont, HOLd, Abrt or rSET Cont PStr Proc or StPt StPt bAUd 300, 600, 1200, 2400, 4800, 9600 1200

dAtA 7 o = Odd parity, 7 E = Even parity 7 o

8 n = 8 data bits and no parity

Prot FULL or On FULL Addr 0 to 31 0 Log On or OFF OFF Int 0.0 to 60.0 minutes 0.0 tag PSA, PS-, P-A, P--, -SA, ---

-S-, --A, --P = Process, S = Set point A = Auxiliary Status

Setup, Chapter 4 WATLOW Series 942 User's Manual

Page 28

Operation

NOTE:

The Upper display always returns to the process value after 1 minute without key strokes.

Operation Menu

In the Operation menu, the 942 operates as a digital set point control. Select a set point and the 942 attains that value on a non-linear ramp. If your unit has auxiliary outputs programmed as events, they can be selected as ON or OFF. All outputs are turned OFF when set point is set to OFF.

Mode Key

Figure 34 The Operation Menu.

[SP]

Prog

Ent1 Ent2

Pb1 Pb2 rE1/It1

rE2/It2 rA1/dE1

rA2/dE2 ct1 ct2

db A1LO

A1HI A2LO A2HI

CAL Aut

[Set Point]

(no)

Program

( )

Event 1

( )

Event 2

( )

Proportional band 1

( )

Proportional band

( )

Reset 1/Integral 1

( )

Reset 2/Integral 2

( )

Rate 1/Derivative1

( )

Rate 2/Derivative 2

( )

Cycle time 1

( )

Cycle time

( )

Deadban

( )

Alarm 1 lo

( )

Alarm 1 hig

( )

Alarm 2 lo

( )

Alarm 2 hig

( )

Calibration offset

( )

Auto-tune

= Parameter may or may not appear

depending on control configuration.

Operation Parameters

[

]

Prog (no)

Ent1

WATLOW Series 942 User's Manual

Set Point: Sets the operating set point for the control outputs. "SP" does not appear, the control set point value will. Decrementing the set point below rL displays OFF in the lower display. This disables all outputs except deviation alarm outputs, which remain energized.

Range: OFF/ rL to rH Default: Dependent on input range Program: Select whether you want to enter the Program menu or enter the

Operation menu. By selecting no, you continue to the Operation menu.

Range: YES or no Default: no Ent1: Select whether Event 1 ( Output 3) is ON or OFF. When a profile is com-

plete or has been put on hold, it holds at its previous state. Only appears if Ot3 = Ent, and your unit has auxiliary outputs. For more information on events see Chapter 6. Range: On or OFF Default: OFF

Setup, Chapter 4

Page 29

Ent2: Select whether Event 2 (Output 4) is ON or OFF. When a profile is complete or has been put on hold, it will hold at its previous state. This parameter only appears if Ot4 = Ent, and your unit has auxiliary outputs. For more information on events see Chapter 6. Range: On or OFF Default: OFF

Operation

Ent2

Proportional Band 1: A proportional band expressed in degrees or process units, or % of span, within which a controller proportioning function is active for Output 1. When Pb1 = 0, it functions as an ON/OFF control. The switching differential is then determined by the HYS1 parameter. If dFL = US: Range: 0 to 999°F/0 to 555°C/0 to 999 Units; 0.0 to 99.9°F/0.0 to 55.5°C/0.0 to 99.9 Units Default: 25°F/2.5°F If dFL = SI: Range: 0 to 999.9% of span Default: 3.0% Span is defined as the operating range of the input sensor or rL to rH if the input type is 0-5 or 420.

Proportional Band 2: A proportional band expressed in degrees or process units, or in % of span, within which a controller proportioning function is active for Output

2. When Pb2 = 0, it functions as an ON/OFF control. The switching differential is determined by the HYS2 parameter. This parameter will not appear if your unit does not have a secondary output or Ot2 = no. If dFL = US: Range: 0 to 999°F/0 to 555°C/0 to 999 Units; 0.0 to 99.9°F/0.0 to 55.5°C/0.0 to 99.9 Units Default: 0° If dFL = SI: Range: 0 to 999.9% of span Default: 0.0%

Reset /Integral1: A reset (integral) control action for Output 1 automatically eliminating offset, or "droop," between set point and actual process temperature in a pro-portional control. Will not appear if your unit does not have a secondary output, or Pb1 = 0. Reset Range: 0.00 to 9.99 repeats/minute Integral Range: 0 and 00.1 to 99.9 minutes/repeat Default: 0.00

Reset /Integral 2: A reset (integral) control action for Output 2 that automatically eliminates offset, or "droop," between set point and actual process temperature in a proportional control. This parameter will not appear if your unit does not have a secondary output, or Pb 2 = 0, or if Ot 2 = no. Reset Range: 0.00 to 9.99 repeats/ minute Integral Range: 0 and 00.1 to 99.9 minutes/repeat Default: 0.00

Pb1

Pb2

rE1/It1

rE2/It2

Rate /Derivative 1: The rate (derivative) function for Output 1 of the Series 942. The rate is determined by how fast the error is changing. This parameter will not appear if Pb 1 = 0. Range: 0.00 to 9.99 minutes Default: 0.00

Rate/Derivative 2: Rate (derivative) function for Output 2. Rate is determined by how fast the error is changing. Does not appear if your unit does not have a secondary output, Pb 2 = 0, or Ot 2 = no. Range: 0.00 to 9.99 min. Default: 0.00

Cycle Time 1: Expressed in seconds, time for a controller to complete one ON/ OFF cycle for Output 1. Time between successive turn ons. This parameter will not appear if Pb 1 = 0, or Output 1 is a process output.

Range: 1 to 60 seconds Default: 5 Cycle Time 2: Expressed in seconds, time for a controller to complete one ON/

OFF cycle for Output 2. Time between successive turn ons. This parameter will not appear if your unit does not have a secondary output, Pb 2 = 0, or Ot 2 = no.

Range: 1 to 60 seconds Default: 5 Dead Band: The area between Output 1 and 2 where no heating or cooling takes

place in a heat/cool proportional control. This parameter only appears if your unit is set up as a ht/CL or CL/ht unit. Range: ±0 to 99°F/0 to 55°C/0 to 99 Units; or ±0.0 to 9.9°F/0.0 to 5.5°C/0.0 to 9.9Units Default: 0

Alarm 1 Low: Represents the low process alarm or low deviation alarm for Alarm

1. This parameter only appears if you have an auxiliary output and Ot3 = AL. See the model number. If AL 1 = Pr: Range: rL to A1HI Default: rL If AL 1 = dE: Range: 0 to -999°F/0 to -999°C/0 to -999 Units Default: -999°F

Setup, Chapter 4 WATLOW Series 942 User's Manual

rA1/dE1

rA2/dE2

Ct1

Ct2

A1LO

Page 30

Operation

A1HI

Alarm 1 High: This parameter represents the high process alarm or high deviation alarm for Alarm 1. This parameter appears if your unit has an auxiliary output and Ot3 = AL. See the model number. If AL 1 = Pr: Range: A1LO to rH Default: rH AL 1 = dE: Range: 0 to -999°F/0 to -999°C/0 to -999 Units Default: -999°F

A2LO

Alarm 2 Low: Represents the low process alarm or low deviation alarm for Alarm 2. Appears if your unit has an auxiliary output and Ot4 = AL. See the model number. If AL 2 = Pr: Range: rL to A2HI Default: rL If AL 2 = dE: Range: 0 to -999°F/0 to -999°C/0 to -999 Units Default: -999°F.

A2HI

Alarm 2 High: Represents the high process alarm or high deviation alarm for Alarm 2. Appears if your unit has an auxiliary output and Ot4 = AL. See the model number. If AL 2 = Pr: Range: A2LO to rH Default: rh If AL 2 = dE: Range: 0 to -999°F/0 to -999°C/0 to -999 Units Default: -999°F

CAL

Calibration Offset: Adds or subtracts degrees from the input signal. Range: -99°F to 99°F/-55°C to 55°C/-99 Units to 99 Units; or -99.9°F to

99.9°F/-55.5°C to 55.5°C Default: 0

AUt

Table 3 Operation Menu Parameters and Descriptions.

Auto-Tune: This parameter initiates auto-tune for Output 1 in the heating mode

only. This parameter appears if Ot1 = ht. For more information on Tuning see Chapter 6. Range: 0 = off, 1 = slow, 2 = medium, 3 = fast Default: 0

Operation Parameters Value Range Factory Default

SP OFF/rL to rH 75°F Prog YES or no no Ent1 On or OFF OFF Ent2 On or OFF OFF Pb1 If dFL = US: 0 - 999°F/0 - 555°C/0 - 999 Units 25°F

0 - 99.9°F/0 - 55.5°C/0 - 99.9 Units If dFL = SI: 0 to 999.9% 3.0% 0 = ON/OFF control. HYS1 = switch. diff.

Pb2 Same as Pb1. Will not appear if Ot 2 = no. 0° rE1/It1 Reset: 0.00 to 9.99 repeats/min. 0.00 repeats/min.

Integral: 0 and 00.1 to 99.9 min./repeat

0.00 = no reset. Will not appear if Pb1 = 0.

rE2/It2 Same as rE1. Will not appear if Pb2 = 0. 0.00 repeats/min. rA1/dE1 0.00 to 9.99 min. 0.00 min.

0.00 = No Rate. Will not appear if Pb1 = 0

rA2/dE2 Same as rA1. Will not appear if Pb2 = 0. 0.00 min. Ct1 1 to 60 seconds 5 seconds

Won't appear if Pb1 = 0, or output 1 is 4-20

Ct2 1 to 60 seconds 5 seconds

Will not appear if Pb2 = 0 or Ot2 = no.

db ± 0 - 99°F/± 0 - 55°C/0 - 99 Units. 0

± 0.0 - 9.9°F/0.0 - 5.5°C/0.0 - 9.9 Units

Appears if ht/CL or CL/ht.

A1LO - Deviation dE -999° to 0° -999°

Process Pr rL to A1HI rL

Appears if auxiliary output and Ot3 = AL.

A1HI - Deviation dE 0° to 999° 999°

Process Pr A1LO to rH rH

Appears if auxiliary output and Ot3 = AL.

A2LO- Deviation dE -999° to 0° -999

Process Pr rL to A2HI rL

Appears if auxiliary output and Ot4 = AL.

A2HI- Deviation dE 0° to 999° 999°

Process Pr A2LO to rH rH

Appears if auxiliary output and Ot4 = AL.

CAL ± 99°F/± 55°C/± 99 Units 0 AUt 0 to 3 0

WATLOW Series 942 User's Manual

Setup, Chapter 4

Page 31

PROGRAM Menu

)

Chapter 5 How to Program & Run the Series 942

We begin this chapter by introducing the Program menu. Each parameter is clearly defined. A description of a few Series 942 features follows, along with a sample profile to experiment with programming the Series 942. You will quickly grasp the necessary terms and concepts by entering and observing your profiles. Enter your profile values in the Master Step Chart at the end of the chapter.

PROGRAM Menu

Create your profiles here in the Program menu. Your profile can have up to 24 steps. Choose one step type per step.

Figure 35 The Program Menu.

[SP]

PrOg(YES)

( )

StEP

( )

StYP

(StPt)

( )

HOUr

( )

min

( )

SEC

( )

rAtE

( )

Ent1

( )

Ent2 rtn

(nO)

(YES)rtn

[Set Point] Program

Step numbe Step type

(Set Point) Set Point

Hou Minute

Second Rate

Event 1 Event 2

Return

(SoAh)

HOUr min

SEC Ent1 Ent2 rtn

( ) ( )

( ) ( ) ( ) ( )

(Soak

Hou Minute

Second Event 1

Event 2 Return

= Parameter may or may not appear

depending on your control's configuration.

JS JC rtn

(JL)

( ) ( )

( )

(Jumploop

Jump count Return

(End)

End rtn

( ) ( )

(End Step) End ProgramJump step

Return

Programming, Chapter 5

WATLOW Series 942 User's Manual 31

Page 32

Program

Program Parameters

Prog (YES)

StEP

StYP

(StPt)

HOUr

Min

Program: Select whether you want to enter the Operation or the Program menu. Selecting YES continues into the Program menu.

Range: YES or no Default: no Step: Represents the current step of the profile to be edited or viewed. When

selecting Step 1, you will not see the JL step type.

Range: 1 to 24 Default: 1 then automatic increment Step Type: Choose from four different step types.

Range: StPt, SoAh, JL or End Default: End

Set Point Step (StPt) : The following parameters are associated with the set point step.

Set Point: Represents the temperature the system tries to achieve. This is done

linearly, producing a ramp from a beginning set point to an end set point. Range: rL to rH Default: 75°F/24°C or rL value if rL ≥ 75°F/24°C or if rH≤ 75°F/24°C

Hour: The number of hours, in combination with the Min and SEC parameters, equaling total step time to achieve the temperature under the StPt step type. This parameter only appears if PtYP = ti.

Range: 0 to 23 Default: 0 Minutes: The number of minutes, in combination with the HOUr and SEC param-

eters, equaling total step time to achieve the temperature under the StPt step type. This parameter only appears if PtYP = ti. Range: 0 to 59 Default: 0

SEC

rAte

Ent1

Ent2

rtn

Seconds: The number of seconds, in combination with the HOUr and Min parameters, equaling total step time to achieve the temperature under the StPt step type. This parameter only appears if PtYP = ti.

Range: 0 to 59 Default: 0 Rate: Represents the rate at which the set point changes in degrees per minute.

This parameter only appears if PtYP = rAte.

Range: 0 to 360°F/0 to 200°C or 0.0 to 360.0°F/0.0 to 200.0°C Default: 0.0 Event 1: Selects whether Event 1 is on or off. This parameter only appears if

Ot3 = Ent.

Range: On or OFF Default: OFF Event 2: Selects whether Event 2 is on or off. This parameter only appears if

Ot4 = Ent.

Range: On or OFF Default: OFF Return: Select no and you return to the StEP parameter to continue programming.

By selecting YES, you exit the program menu and return to the control set point.

Range: YES or no Default: no

32 WATLOW Series 942 User's Manaul

Programming, Chapter 5

Page 33

Program

Soak (SoAh) : The following parameters are associated with the soak step. Hour: The number of hours, in combination with the Min and SEC parameters,

equaling total step time to achieve the temperature under the SoAh step type. This parameter only appears if PtYP = ti.

Range: 0 to 23 Default: 0 Minutes: The number of minutes, in combination with the HOUr and SEC param-

eters, equaling total step time to achieve the temperature under the SoAh step type. This parameter only appears if PtYP = ti.

Range: 0 to 59 Default: 0 Seconds: The number of seconds, in combination with the HOUr and Min param-

eters, equaling total step time to achieve the temperature under the SoAh step type. This parameter only appears if PtYP = ti.

Range: 0 to 59 Default: 0 Event 1: Selects whether Event 1 is on or off. Only appears if Ot3 = Ent.

Range: On or OFF Default: OFF Event 2: Selects whether Event 2 is on or off. Only appears if Ot4 = Ent.

Range: On or OFF Default: OFF Return: Select no and you return to the StEP parameter to continue programming

the 942. By selecting YES, you exit the program menu and return to the control set point. Range: YES or no Default: no

(SoAh)

HOUr

Min

SEC

Ent1

Ent2

rtn

Jumploop Step (JL) : The following parameters are associated with the jumploop step. When StEP = 1, JL will not appear.

Jump Step: The Series 942 jumps backwards to any step in your file. Range: 1 to 23 Default: 1

Jump Count: The number of times the Series 942 jumps to the step specified by

the JS (jump step) parameter. 0 = infinite number of jumps.

Range: 0 to 100 Default: 0 Return: Select no and you return to the StEP parameter to continue programming

the Series 942. By selecting YES, you exit the program menu and return to the control set point. Range: YES or no Default: no

End Step (End) : The following parameters are associated with the end step. End: When HOLd is selected, the control and auxiliary outputs are enabled and

maintain the same state as in the last set point and/or soak step before the End step was encountered. When selected as OFF, the control and auxiliary outputs (except for deviation alarms) are de-energized and OFF is shown in the lower display. When selected as OFFA, the control outputs are de-energized and OFF is shown in the lower display. Deviation alarms are inactive (relay energized) and process alarms are active (relay energized in non-alarm conditions). Range: HOLd or OFF Default: HOLd

(JL)

rtn

(End)

End

Return: Select no and you return to the StEP parameter to continue programming the 942. By selecting YES, you exit the program menu and return to the control set point. Range: YES or no Default: no

Programming, Chapter 5

WATLOW Series 942 User's Manual 33

rtn

Page 34

RUN Menu

)

Running a Series 942 Profile

You can run your Series 942 profile from anywhere except the Setup menu. Press the HOLD/RUN key. The RUN LED begins flashing, and the lower display flashes and asks what StP (step) to begin on. Use the UP/DOWN key to enter the step and press the HOLD/RUN key once again, your profile begins, and the RUN LED is lit. If the HOLD/RUN key is not pressed twice within 1 minute, the RUN function will abort. While the profile is RUNning, you can only view the RUN menu. Press the MODE key to advance you through the RUN menu. For more information on Pout (power outages) see Page 25.

Resume a Profile

To resume a halted profile, press the HOLD/RUN key once. Press the MODE key to advance to the rESU parameter, and press the HOLD/RUN key again, the profile resumes, and the RUN LED is lit. You can only resume at the exact step you left off on. If you halt a running profile and make changes, you cannot resume running. The rESU parameter only appears when a running profile is halted.

To Run your profile... Press the key twice. To Stop a running profile... Press the key once. To Resume a halted profile... Press the key, press the

key to advance to the rESU parameter, and press the key.

Figure 36 The Run Menu.

NOTE: Shaded parame-

ters may not appear on your control. These parameters are dependent on how your control is configured.

34 WATLOW Series 942 User's Manaul

StP rESU

rtn

EnSP HOUr MIn

SEC rAtE

Ent1 Ent2 EJC

[SP]

( ) ( ) ( )

( ) ( )

( ) ( ) ( ) ( )

H/R

Step (# to start at)

Resume (step # Return

Current Set Poin End Set Poin

Hour remaining Minutes remaining

Seconds remaining Rate Event 1

Event 2 Elapsed jump coun

H/R

= MODE Key = HOLD/RUN Key = UP/DOWN Key

Programming, Chapter 5

Page 35

Master Step Chart

Chart 1 - Master Step Chart

Step # √ Step Type Values Time On Events OFF

StPt SP HOUr Min SEC Ent1 Ent2

rAtE SoAh HOUr Min SEC Ent1 Ent2 JL JS JC End OFF OFFA HOLd

Step # √ Step Type Values Time On Events OFF

StPt SP HOUr Min SEC Ent1 Ent2

rAtE SoAh HOUr Min SEC Ent1 Ent2 JL JS JC End OFF OFFA HOLd

Step # √ Step Type Values Time On Events OFF

StPt SP HOUr Min SEC Ent1 Ent2

rAtE SoAh HOUr Min SEC Ent1 Ent2 JL JS JC End OFF OFFA HOLd

Make photocopies, keep original clean.

Step # √ Step Type Values Time On Events OFF

StPt SP HOUr Min SEC Ent1 Ent2

rAtE SoAh HOUr Min SEC Ent1 Ent2 JL JS JC End OFF OFFA HOLd

Step # √ Step Type Values Time On Events OFF

StPt SP HOUr Min SEC Ent1 Ent2

rAtE SoAh HOUr Min SEC Ent1 Ent2 JL JS JC End OFF OFFA HOLd

Step # √ Step Type Values Time On Events OFF

StPt SP HOUr Min SEC Ent1 Ent2

rAtE SoAh HOUr Min SEC Ent1 Ent2 JL JS JC End OFF OFFA HOLd

Programming, Chapter 5

WATLOW Series 942 User's Manual 35

Page 36

Events

Event Outputs

One of the features of the Series 942 is its capability for two event outputs. An "event output" is simply a pre-programmed ON/OFF event per profile step. The event may turn any number of peripheral devices ON or OFF to assist you in controlling your process, system or environment.

For instance, in an environmental chamber, you might wish to circulate air at a given time in your profile 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.

Ent1 and Ent2 are not visible under the Operation menu unless your unit has auxiliary outputs and you Setup Ot3 and Ot4 as events.

To select auxiliary outputs as events, enter the Setup menu by pressing the UP/ DOWN keys simultaneously for 3 seconds. The LOC parameter appears. Press the MODE key until you reach the Ot3 parameter. The default for Ot3 is AL (alarms). Change the value to Ent (event) if it hasn't already been done. Press the MODE key to continue on to the Ot4 parameter. Do the same for this parameter also. Continue pressing the MODE key to exit the Setup menu.

If you return to the Operation menu, Ent1 and Ent2 are visible, and can be turned ON or OFF from here. Ent1 and Ent2 can also be viewed under the StPt (Set Point) and SoAh (Soak) parameters in the Program menu.

These event outputs are mechanical relays rated at 6 amps up to 240VAC.

Guaranteed Soak Deviation

The Series 942 Guaranteed Soak Deviation (gSd) feature insures that the actual temperature tracks a programmed profile within a window around set point. See the example on the next page. If the deviation is exceeded, the time clock stops and the lower display alternately flashes gSd and the current parameter until the process variable returns within the window. Programmed in degrees or units, gSd is located in the Setup menu. Entering a value of (0) disables the Guaranteed Soak Deviation function.

36 WATLOW Series 942 User's Manaul

Programming, Chapter 5

Page 37

Set Point

Jumploop

Set Point

Guaranteed Soak Deviation Window Around Set Point

Time

Multiple Profiles

The Series 942 is a single profile control, but can be programmed for multiple profiles. To do this, enter your first profile; the next step you enter following the End step is the start of another profile. You can continue entering profiles until you run out of steps, remember there are a total of 24 steps.

Jumploop

Figure 37 Guaranteed Soak Deviation Example

The Series 942 can only jump backwards. A jump forces you to a step already performed. The Jump Step (JS) must be less than the current step. You cannot jumploop to the step that you are on.

Step 2 StPt Step 3 StPt Step 4 StPt Step 5 Jumploop JS - 02 JC - 01 Step 6 End

Your Jump Count (JC) can be anything from 0 - 100. If you enter 0, this will be an infinite loop and never progresses to Step 6.

Programming, Chapter 5

WATLOW Series 942 User's Manual 37

Page 38

Sample Program

Programming a Ramping Profile

Our first step in programming is to make a short ramp and soak profile. Step 1 initializes the set point to a known starting point for the ramp, Step 2 is a short ramp, and Step 3 is a soak step, which holds the programmed set point constant for the programmed time. Step 4 is an end step signalling the end of the profile.

1. When the lower display reads set point, press MODE once and you see the Prog

2. The Series 942 asks you for a StEP. The upper display reads (1).

3. Press the MODE key and you are asked for a step type (StYP). The default is

4. Use Table 4 to enter the corresponding parameters and values. The parameters

This is a sample program. Depending on your application and parameter settings, your system may not respond like this.

parameter. Select YES in the upper display. Press the MODE key once again.

End. Use the UP/DOWN keys to select StPt (set point) then press MODE if it is not already there.

appear from left to right on the table. Remember that the MODE key is used to progress through the menu, and the UP/DOWN keys are used to select parameters and values.

Table 4 Series 942 Ramp and Soak Profile

NOTE: If auxiliary

outputs are not present or Ot3 and Ot4 are selected as alarms, the Ent1 and Ent2 parameters will not appear in the program menu.

StEP StYP SP HOUr Min SEC Ent1 Ent2 End rtn

(Step Type) (Set Point) 1 StPt 75 0 0 1 OFF OFF -- nO 2 StPt 100 0 0 25 On OFF -- nO 3 SoAh -- 0 0 25 On OFF -- nO 4 End OFF YES

125

Step 4

A stop step.

An end step.

Temp/°F

100

Step 2

Step 1

Initializes

Set Point.

0 5 10 15 20 25 30 35 40 45 50

Ramps from

75 to 100°F.

Time (seconds)

Step 3

A soak step

holds set

point at 100°F.

point at 75°F.

Running Y our Profile

1. Start your profile by pressing the HOLD/RUN key. You can be at any point except the Setup menu.

2. The RUN LED begins flashing. The upper display shows the step to begin on, and the bottom display shows the StEP parameter.

3. Press the HOLD/RUN key again. If not pressed within approximately 1 minute, the RUN procedure will abort. The profile starts running.

38 WATLOW Series 942 User's Manual

Programming, Chapter 5

Page 39

Sample Program

The RUN LED is continually lit. The upper display shows the PROCESS value, and the lower display shows the current set point.

You may step through the Run menu parameters with the MODE key to see what the step type is and what the parameters are set at. At any time you may press the HOLD/RUN key to stop the profile. To resume running the profile where it was stopped, press the HOLD/RUN key once; the RUN LED begins flashing. Now, press the MODE key to advance to the rESU parameter; once again, press the HOLD/RUN key. After the profile has ended the Run LED is off and the lower display reads OFF. This means the End step was selected as OFF, disabling all outputs.

Editing Y our Profile

Now let's try editing the profile by expanding it with another ramp and soak step, adding a jumploop and programming the End step to hold. We'll jump to Step 1 and repeat Steps 1 through 6 two more times. This is accomplished by programming a Jump Step (JS) = 1 and Jump Count (JC) = 2. This means that once the 942 goes through the profile and reaches Step 6, it jumps back to Step 1 and repeats the profile two more times (Steps 1 - 5). It then continues to Step 7 and holds the set point and event status of the last step of the profile before the end step was encountered.

By this time you should understand the basic concept of the Series 942 and be able to get around on your own. Remember that the MODE key takes you through the menus and the UP/DOWN keys select parameters and values.

1. Return to the PROGRAM menu by selecting YES when Prog appears.

2. Press the MODE key and select (4) when StEP appears. We are going to change this step type from an End step to a Set Point step. This is our second ramp. Use Table 5 to enter values into the corresponding parameters.

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

Table 5 Editing Your Profile,

Steps 4 - 7.

StEP StYP SP HOUr Min SEC Ent1 Ent2 JS JC End rtn

(Step Type) (Set Point)

4 StPt 125 0 0 25 OFF On -- -- -- nO 5 StPt 125 0 0 25 On OFF -- -- -- nO 6JL -- ----------12--nO 7 End -- -- -- -- -- -- -- -- HOLd YES

NOTE: If auxiliary out-

puts are not present or Ot3 and Ot4 are selected as alarms, the Ent1 and Ent2 parameters will not appear in the Program menu.

Temp/°F

125

Step 2

Ramps

100

Step 1 Initializes

Set Point.

0 10 20 30 40 50 60 70 80 90 100...

Step 4 Ramps

Step 3 Soaks

Edit Program

Time (seconds)

Step 5 Soaks

Step 6 Jumps to Step 1 and repeats program twice.(JC-2), then continues to HOLd set point.

Step 7

Holds Set Point.

300

Programming, Chapter 5

WATLOW Series 942 User's Manual 39

Page 40

Tuning

Chapter 6

How to Tune and Operate

Tuning - Automatic

Auto-tuning: The Series 942 can automatically tune the PID parameters to fit the

characteristics of your particular thermal system. The auto-tuning procedure operates on a thermal response value — slow, medium,

or fast. Use the slow thermal response when your process does not need to reach set point too rapidly, or if it usually does not exceed set point. A fast thermal response produces a rapid temperature change over a short period of time.

Once the auto-tune sequence has begun, the heat proportional band is set to 0 and the control goes into an ON/OFF mode of control at 90% of the established set point. The displayed set point remains unchanged.

The cool output remains off for the duration of tuning. Once the control finishes "learning" the system, it returns to a standard PID control with the heat PID values automatically set as a result of auto-tuning. Tuning is complete within 80 minutes. Any change of set point, while in auto-tune, re-initiates the auto-tune procedure.

To start auto-tuning:

1. Press the MODE key until the AUt parameter appears in the data display.

The AUt parameter will not appear under the Operation menu if the set point value is OFF.

2. Select a thermal response value, 1 = slow, 2 = medium, and 3 = fast, using the UP/DOWN keys. A thermal response value of 2 satisfactorily tunes most thermal systems.

3. Press the MODE key. While the control is in the tuning mode, the lower display alternately displays the normal information and the AUt parameter. The time between alternations is 1 second.

4. When tuning is complete, the displays return to their previous state and AUt reverts to 0. The 942 installed the appropriate PID tuning parameters and saved them in the non-volatile memory.

To abort auto-tuning, reset the AUt parameter to 0, or cycle power off and on. In all cases, aborting auto-tune restores all original values.

WATLOW Series 942 User's Manual

Tuning and Operating, Chapter 6

Page 41

Tuning - Manual

For optimum control performance, tune the Series 942 to the thermal system. The tuning settings here are for a broad spectrum of applications; your system may have somewhat different requirements. NOTE: This is a slow proce-

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

1. Apply power to the Series 942 and enter a set point. Begin with these Operation Parameters: Pb1 = 1, rE1/It1 = 0.00, Ct1 = 5, rA1/dE1 = 0.00, CAL = 0, AUt= 0.

2. Proportional Band Adjustment (Output 1): Gradually increase Pb1 until

the Upper display temperature stabilizes to a constant value. The process temperature will not be right on set point because the initial reset value is

0.00 repeats per minute. (When Pb1 = 0; rE1 and rA1 are inoperative, and the 942 functions as a simple ON/OFF control.) The HYSX parameter determines the switching differential value.

3. Reset/Integral Adjustment: Gradually increase rE1/It1 until the upper display temperature begins to oscillate or "hunt." Then slowly decrease rE1/It1 until the Upper display stabilizes again near set point.

Tuning

NOTE: The cycle time (Ct1) parameter will not appear if Output 1 (Ot1) is a process output.

4. Cycle Time Adjustment: Set Ct1 as required. Faster cycle times some-

times achieve the best system control. 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 quality of control you want.

5. Rate/Derivative Adjustment: Increase rA1/dE1 to 1.00 minute. Then raise set point by 20° to 30°F, or 11° to 17°C. Observe the system's approach to set point. If the load temperature overshoots set point, increase rA1/dE1 to 2.00 minutes.

Then raise set point by 20 to 30°F, or 11 to 17°C and watch the approach to the new set point. If you increase rA1/dE1 too much, 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.

6. Calibration Offset Adjustment: You may want your system to control to a temperature other than the value coming from the input sensor, such as when the sensor cannot directly measure the process. If so, measure the difference between that temperature (perhaps at another point in the system) and the process value showing in the Upper display. Then enter the CAL offset value you want. Calibration offset adds or subtracts degrees from the value of the input signal.

NOTE:

An X applies to either Hysteresis 1 or 2.

Tuning and Operating, Chapter 6

WATLOW Series 942 User's Manual

Page 42

Auxiliary

Changing the Position of an Auxiliary Jumper

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

1. Remove power from the Series 942. Turn the front panel screw 90° counterclockwise.

2. 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.

3. Set the jumper to the position you want. See Figure 38 for jumper location.

4. 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.

Options Board

A007-1954

Figure 38 Auxiliary Jumper Location.

NOTE: Depending on the unit you order, your control may have 0, 1, or 2 auxiliary jumpers.

AUX1

A007-1828

Control Chassis - Top View

AUX2

N.O. Contacts (Form A)

N.C. Contacts (Form B)

Auxiliary 1 (Output 3) Auxiliary 2 (Output 4)

The auxiliary output de-energizes upon an alarm or power interruption to the 942's power supply. When you select N.O. Contacts, the contact is open when an alarm occurs. When selecting N.C. Contacts, the contact closes when an alarm occurs. When an event is ON the N.O. contacts close and the N.C. contacts open. If the L3 or L4 LED on the front panel are lit, this indicates an energized event or alarm condition for Output 3 or 4.

WATLOW Series 942 User's Manual

Using Alarms

The Series 942 has two alarm types, Process or Deviation. A Process alarm sets an absolute temperature. When the process exceeds that absolute temperature limit an alarm occurs. The Process alarm set points may be independently set high and low.

Tuning and Operating, Chapter 6

Page 43

A Deviation alarm alerts the operator when the process strays too far from set point. The operator can enter independent high and low alarm settings. The reference for the deviation alarm is the set point. Any change in set point causes a corresponding shift in the deviation alarm. Example: If the set point is 100°F, and a deviation alarm is set at +7°F as the high limit, and -5°F as the low limit, the high alarm trips at 107°F, and the low alarm at 95°F. If you change the set point to 130°F, the alarms follow the set point and trip at 137°F and 125°F.

AH 2

AH 1

Temp

New SP1

SP1

Actual

0°C

Time

AL 1

AL 2

Both Process and Deviation alarms can be latching or non-latching. When the alarm condition is removed a non-latching alarm automatically clears the alarm output. The operator must manually clear a latching alarm before the alarm disappears. The alarm condition must also be removed before the alarm can be cleared.

Flashing 'LO" or "HI" in the lower display indicates an alarm. The Lower display alternately shows information from the current parameter and the "LO" or "HI" alarm message at one second intervals. The alarm output is de-energized and the L3 or L4 LED is lit.

Alarms

Figure 39 Deviation Alarm Example

NOTE: For Deviation alarms: When the End step in the Program menu is OFF or OFFA, the deviation alarms are active (relay energized).

For Process alarms: When the End step is OFF, process alarms are disabled in a deenergized position. When OFFA is selected, the process alarm works normally.

To clear an alarm…

• First correct the alarm condition, then…

• If the alarm is latching…

Clear it manually; press the HOLD/RUN key once as soon as the process temperature is inside the alarm limit according to the HYSX parameter.

• If the alarm is non-latching…

The alarm will clear itself automatically as soon as the process temperature is inside the alarm limit according to the HYSX parameter.

Press once -

Clear

a latched

and

corrected

alarm.

Alarm Silencing for auxiliary output 3 is available with the deviation alarm. If it is a

non-latching alarm, this overrides the normal alarm output functions only during initial power up. If latching, press the HOLD/RUN key once to override the alarm output function. With alarm silencing, the alarm message and alarm LED's show the alarm condition but the output remains in a non-alarm state until the process value is within the safe region of the deviation band. Any future deviation outside this safe band triggers an alarm.

NOTE: An X applies to either Hysteresis 3, or 4.

Figure 40 Alarm Display Examples

WARNING:

An alarm display will be masked by an error condition or when the control is in the Calibration or Setup Menus.

Tuning and Operating, Chapter 6

WATLOW Series 942 User's Manual

Page 44

Error Codes

Figure 41 Error Code Display Example

WARNING:

Electrical noise or a noise event, vibration or excess environmental moisture or temperature may cause Series 942 errors to occur. If the cause of an error is not otherwise apparent, check for these.

Error Code Messages

Four dashes, "- - - -", in the upper display indicate a Series 942 error.

• The error code is visible in the lower display.

• Error code definitions and actions…

Er 1 - Sensor overrange error

The sensor input generated a value that was higher than that allowed for the range of the sensor, or the A/D circuitry malfunctioned. Enter a valid input. The A/D value is above the range limits, but within the A/D conversion limits. Make sure the In parameter matches your sensor.

Er 2 - Sensor underrange error

The sensor input generated a value that was lower than that allowed for the range of the sensor, or the A/D circuitry malfunctioned. Enter a valid input. The A/D value is below the range limits, but within the A/D conversion limits. Make sure the In parameter matches your sensor.

Er 3 - Ambient error

Check the specification for the ambient temperature range.

Er 4 - Configuration error

The unit's microprocessor is faulty; call the factory.

Er 5 - Non volatile checksum error

The nonvolatile memory checksum discovered a checksum error. Unless a momentary power interruption occurred while the unit was storing data, the nonvolatile memory is bad. Call the factory.

Er 6 - A/D underflow error

The A/D circuit is underrange. An open or reversed polarity sensor is the most likely cause. Check the sensor; if the connection is good, and the sensor functions properly, call the factory. The A/D underrange voltage is too low to convert an A/D signal. Make sure the In parameter matches your

sensor.

Er 7 - A/D overflow error

The A/D circuit is overrange. An open or reversed polarity sensor is the most likely cause. Check the sensor; if the connection is good, and the sensor functions properly, call the factory. The A/D underrange voltage is too high to convert an A/D signal. Make sure the In parameter matches your sensor.

WATLOW Series 942 User's Manual

Tuning and Operating, Chapter 6

Page 45

Error Code Actions

• Error codes Er 1, Er 2, Er 3, Er 6, and Er 7 will result in these conditions:

• Control outputs turn OFF.

• The auxiliary output (if present and programmed as an alarm) will be in the alarm state (LED lit). If programmed as an event, the output turns OFF.

• The Upper display will read "- - - -".

• The Lower display indicates the error code.

• The HOLD/RUN and MODE keys are inactive. The UP/DOWN keys may be used together to enter the Setup Menu.

• To clear a corrected error…

• Cycle power to the control, or MODE through the SETUP menu until you return to the set point.

• If an error occurs while in the RUN mode, the program cannot be resumed. Set point defaults to the previous value.

Errors/Outputs

• Error codes Er 4 and Er 5 will result in these conditions:

• Control outputs turn OFF.

• The auxiliary outputs, if present, are in their alarm state (de-energized with the LED lit).

• The Upper display indicates "- - - -".

• The Lower display indicates the error code.

• All Keys are inactive.

• All Setup Menu parameters return to default values.

• The above conditions will occur regardless of the value of LOC, or the presence of the Setup or Calibration Menus.

• To clear a corrected error…

• Cycle power to the control.

Tuning and Operating, Chapter 6

WATLOW Series 942 User's Manual

Page 46

Specifications

NOTE: An X applies to either Hysteresis 1, 2, 3, or 4.

Appendix 1

Control Mode

• 24 step ramping control or programmer.

• Simple, non-ramping set point.

• Single input, dual outputs.

• Optional dual auxiliary outputs, selectable as alarms or time based events.

• Optional retransmit of set point or process variable.

• RS-422A, RS-423A, or EIA-485 data communications available.

• Control outputs: User selectable as: Heat, Heat/Cool, Cool, Cool/Heat

• Outputs independent, related via dead band for Heat/Cool.

• ON/OFF: Selectable per Outputs 1 and 2.

• Proportional band: 0 to 999°F/0 to 555°C/0 to 999 Units or % of span Reset: 0.00 to 9.99 repeats per minute. Integral: 0 and 00.1 to 99.9 minutes per repeat. Rate/Derivative: 0.00 to 9.99 minutes. Cycle time: 1 to 60 seconds.

• Dead band: ± 99°F, ± 55°C or ± 99 Units (± 9.9°F, ± 5.5°C or ±9.9 units for rtd.1 and process units)

Operator Interface

• Membrane front panel.

• Dual, four digit 0.56" (14 mm) LED displays.

• MODE, HOLD/RUN, UP, and DOWN keys.

NOTE:

* B t/c: Useable range is suggested to be 1598 to 3092°F or 870 to 1700°C. Range is at 32° to allow using at low temperatures without range low sensor errors.

Input

• Thermocouple, RTD, and electrical process input.

• Automatic cold junction compensation for thermocouple.

• RTD input 2 or 3 wire, platinum, 100 ohm @ 0°C, software selectable: JIS curve #3916 (0.003916 Ω/Ω/°C) or DIN curve #3850 (0.003850 Ω/Ω/°C).

• Sensor break protection de-energizes control outputs to protect system.

• Grounded or ungrounded sensors.

• °F, °C, or process variable units are user selectable.

• J t/c: 32 to 1382°F or 0 to 750°C K t/c: -328 to 2282°F or -200 to 1250°C T t/c: -328 to 662°F or -200 to 350°C N t/c: 32 to 2282°F or 0 to 1250°C C t/c: 797 to 4200°F or 425 to 2315 °C PT 2 (Platinel 2) 32 to 2543°F or 0 to 1395°C R t/c: 32 to 2642°F or 0 to 1450°C S t/c: 32 to 2642°F or 0 to 1450°C *B t/c: *32 to 3092°F or 0 to 1700°C 1° RTD: -328 to 1112°F or -200 to 600°C

0.1° RTD: -99.9 to 392.0°F or -99.9 to 200.0°C 0-5VDC: -500 to 3500 Units 4-20mA: -500 to 3500 Units

Primary Output (Heating or Cooling)

• Solid state relay, Form A 0.5A @ 24VAC min., 264VAC maximum, optoisolated, zero cross switching. Off state impedance is 20KΩ minimum for 942A-XBXX-X0000 units, and infinite impedance for 942A-XKXX-X000 units.

• Electromechanical relay, Form C, 6A @ 120/240VAC, 6A @ 28VDC, 1/8 hp. @ 120VAC, 125VA @ 120VAC. Off state impedance is 20KΩ min.

• Switched DC Open collector, 500Ω minimum load resistance, 1KΩ load, 9mA minimum, 22mA maximum, non-isolated.

• 0-20mA or 4-20mA reverse or direct into a 600Ω maximum load impedance, non-isolated.

• 0-10VDC or 0-5VDC reverse or direct into a 1KΩ minimum load impedance, non-isolated.

WATLOW Series 942 User's Manual Appendix

Page 47

Secondary Output (Heat, Cool or None)

• Electromechanical relay, Form A, 6A @ 120/240VAC, 6A @ 28VDC, 1/8 hp. @ 120VAC, 125VA @ 120VAC. Off state impedance is 20KΩ min.

• Switched DC, Open collector, 500Ω minimum load resistance, 1KΩ load, 9mA minimum, 22mA maximum, non-isolated.

Auxiliary Outputs

• Electromechanical relay, Form A (N.O.) or B (N.C.), 6A @ 28VDC, 1/8 hp. @ 120VAC, 125VA @ 120VAC. Off state impedance is 20KΩ minimum.

• Latching or non-latching.

• Process or deviation.

• Separate high and low values.

• Alarm silencing (inhibit) on power up for Alarm 1.

Retransmit Output

• 4-20mA into a 600Ω maximum load, non-isolated. Retransmit of process or set point. User selectable range.

• 0-5VDC into a 10KΩ minimum load, non-isolated. Retransmit of process or set point. User selectable range.

Accuracy

• Calibration Accuracy and Sensor Conformity: ± 0.1% of span, ± 1 LSD, 77°F ± 5°F (25°C ± 3°C) ambient & rated line voltage ± 10%.

• Accuracy Span: 1000°F or 540°C minimum.

• Temperature Stability: 0.1°F/°F (0.1°C/°C) change in ambient.

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

Specifications

Communications

• Serial data communications.

• RS-422A or RS-423A (RS-232C compatible) or EIA-485, user selectable.

• ANSI X3.28 protocol, or XON/XOFF protocol.

• Isolated.

• Data logging.

• #6 compression type screw terminals.

Agency Approvals

• UL and CSA pending.

Terminals

• #6 compression type screw terminals.

Power

• 120/240VAC +10%, -15%, 50/60Hz, ± 5%.

• 16VA maximum.

• Data retention upon power failure via nonvolatile memory.

Operating Environment

• 32 to 149°F/0 to 65°C.

• 0 to 90% RH, non-condensing.

Dimensions

• Height: 3.8 in 97 mm

• Width: 3.8 in 97 mm

• Overall depth: 7.0 in 178 mm

• Behind panel depth: 6.0 in 153 mm

• Weight: 2.5 lb max. 0.4 kg

Appendix

WATLOW Series 942 User's Manual

Page 48

Model No.

Control Series 942 = 1/4 DIN, single input,

Inputs Type

Series 942 Model Number Information

The Series 942 Model Number, listed on your unit sticker, is defined below.

405A

dual output, dual auxiliary outputs, dual digital displays.

1 = Type J, K, T, N, C, PT 2 thermocouple 2 = Type J, K, T, N, C, PT 2 thermocouple,

RTD 1°, 4 - 20mA, 0-5VDC

3 = Type J, K, T, N, C, PT 2 thermocouple,

RTD 0.1°, 4 - 20mA, 0-5VDC

4 = Type R, S, B thermocouple

#1 Output Type

B = Solid State Relay, Form A, 0.5A C = Switched DC, Open Collector, non-isolated D = Mechanical Relay, Form C, 6A E = Process 0 - 10VDC, non-isolated F = Process 4 - 20mA, non-isolated G = Process 0 - 20mA, non-isolated H = Process 0 - 5VDC, non-isolated K = Solid State Relay without contact suppression

Form A, 0.5A

#2 Output Type

A = None B = Solid State Relay, Form A, 0.5A C = Switched DC, Open Collector, non-isolated D = Mechanical Relay, Form C, 6A K = Solid State Relay without contact suppression

Form A, 0.5A

Auxiliary Outputs

0 = None 1 = Single, Mechanical Relay, 6A, Form A or B 2 = Dual, Mechanical Relay, 6A, Form A or B 3 = Single, Mechanical Relay, 6A/0 - 5VDC retransmit 4 = Single, Mechanical Relay, 6A/4 - 20mA retransmit 5 = No auxiliary output/0 - 5VDC retransmit 6 = No auxiliary output/4 - 20mA retransmit

Communications

A = None B = Isolated RS-423/RS-422 D = Isolated EIA-485

WATLOW Series 942 User's Manual Appendix

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Appendix 2

Noise and Installation Guidelines

Installation Guidelines For Preventing Noise

For improved electrical noise immunity, install the Series 942 as far away as possible from motors, relays, and other similar electrical noise generators.

Do not run low power (sensor input) lines in the same bundle as AC power lines. Grouping these lines in the same bundle can create electrical noise interference which may result in error codes in the Series 942.

The Culprit

Install - Wire

Most noise problems stem from wiring practices. They're the major means of coupling noise from its sources to the control circuit. The following information will tell you how to eliminate or decrease noise.

An Information Resource

For wiring guidelines , refer to the IEEE Standard No. 518-1982, available from IEEE, Inc. 345 East 47th Street, New York, NY 10017.

Noise Sources

• Switches and relay contacts operating inductive loads such as motors, coils, solenoids, and relays, etc.

• Thyristors or other semiconductor devices which are not zero crossoverfired (randomly-fired or phase angle-fired devices).

• All welding machinery.

• Heavy current carrying conductors.

• Fluorescent and neon lights.

How To Decrease Noise Sensitivity

• Physical separation and wire routing must be given careful consideration in planning the layout of the system. For example, A.C. power supply lines should be bundled together and physically kept separate from input signal lines (sensor lines). A 12" (305 mm) minimum separation is usually effective. Keep all switched output signal lines (high power level) separate from input signal lines (sensor lines). Cross other wiring at 90° angles whenever crossing lines is unavoidable.

Appendix

WATLOW Series 942 User's Manual

Page 50

Wiring Guide

• Another important practice is to look at the system layout; identify and locate electrical noise sources such as solenoids, relay contacts, motors, etc. Route the wire bundles and cables as far away as possible from these noise sources. Don't mount relays or switching devices close to a microprocessor control. Don't have phase angle-fired devices in the same electrical enclosure or on the same power line with the control.

• Shielded cables should be used for all low power signal lines to protect from magnetic and electrostatic coupling of noise. Some simple pointers are:

◊ Whenever possible, run low level signal lines unbroken from signal source

to the control circuit.

◊ Connect the shield to the control circuit common at the control end only.

Never leave the shield unconnected at both ends. Never connect both shield ends to a common or ground.

◊ Maintain shield continuity at daisy chain connection points by reconnecting

the broken shield.

◊ Assume no electrostatic shielding when using the shield as a signal return.

If you must, use triaxed cable (electrostatically shielded coaxial cable).

• Twisted pair wire should be used any time control circuit signals must travel over two feet, or when they are bundled in parallel with other wires.

• The size or gauge of wire should be selected by calculating the maximum circuit current and choosing the gauge meeting that requirement. Using greatly larger wire sizes than required generally will increase the likelihood of electrostatic (capacitance) coupling of noise.

• Ground loops must be eliminated in the entire control system. There are obvious loops which can be spotted by studying the "as-built" wiring diagram. There are also the not-so-obvious ground loops that result from connecting internal circuit commons in the manufacturer's equipment. An example is a control circuit designed to work with a grounded sensor input.

• Do not daisy chain A.C. power (or return) lines, or output signal (or return) lines to multiple control circuits. Use a direct line from the power source to each input requiring A.C. power. Avoid paralleling L1 (power lead) and L2 (return lead) to load power solenoids, contactors, and control circuits. If an application uses L1 (power lead)to switch a load, L2 (return lead) has the same switched signal and could couple unwanted noise into a control circuit.

• Grounding the chassis of each piece of equipment in the system is very important. Here is a simple practice that works best. 1) Connect each individual equipment to the over-all chassis immediately adjacent to that piece.

2) Tie all major chassis ground terminals together with one lead (usually green wire) tied to ground at one point. Don't connect ground to the control case if the control is in a grounded enclosure (preventing ground loops).

WATLOW Series 942 User's Manual

• Do not confuse chassis grounds (safety ground) with control circuit commons or with A.C. supply L2 (return or neutral line). Each return system wiring must be separate. Absolutely never use chassis ground (safety) as a conductor to return circuit current.

Appendix

Page 51

How To Eliminate Noise

• Use "snubbers" ("QUENCHARC™") to filter out noise generated by devices such as relays, relay contacts, solenoids, motors, etc. A snubber is a simple filter device using a 0.1µf, 600 volt, non-polarized capacitor in series with a 100 ohm, 1/2 watt resistor. The device can be used on A.C. or D.C. circuits to effectively dampen noise at its source.

• The general purpose Watlow snubber, described above, is 0804-0147-0000. For other "QUENCHARC" sizes contact:

PAKTRON P.O. Box 5439 Lynchburg, VA 24502 Phone: 804/239-6941

• A Metal Oxide Varistor (MOV) can be used to limit voltage "spikes" that occur on the A.C. supply lines as a result of lightning strikes, switching large motors, etc. The MOV is available in several varieties and for 115 or 230 volt lines. The device dissipates the voltage "spikes" to ground and in doing so repeatedly, deteriorates its ability to function. MOVs have a limited life. Watlow stocks several MOVs. See Table 7.

Wiring Guide

• "Islatrols" and other similar power line filters are designed to carry the power for the control circuit and "buffer" the control circuit from A.C. line noise. Devices like the Islatrol use media (electromagnetic filtering) other than electric circuits to filter out electrical noise. Take care in matching the power capabilities of the filter with power demands of the circuit. Keep line filters as close to the control as possible to minimize the area for interference pick up.

• Islatrols are available from: Control Concepts Corporation

328 Water Street P.O. Box 1380 Binghamton, NY 13902-1380 Phone: 607/724-2484

I - 101 (1A, 120VAC) I - 202 (2.5A, 208/240VAC) I - 105 (5A, 120VAC) I - 207 (7.5A, 208/240VAC) I - 115 (15A, 120VAC)

• The ultimate protection is an "uninterruptable" power supply. This "senses"

the A.C. power line; when the line fluctuates, a battery powered 60Hz inverted circuit takes over, supplying power within one-half to one cycle of the A.C. line; very expensive.

Appendix

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Page 52

Noise Guidelines

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 connected. The ohmmeter should read a high ohm value. If you have a low ohm value across this gap, there is at least one ground loop present in your system.

Or check for continuity; your reading should be "open." If you do find continuity, you must now begin looking for the ground loops. Begin disconnecting ground 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.

Table 6 Noise Suppression Device Ratings

Item Electrical Ratings Part Number

Differential Mode Line Filter Refer to the Islatrol listing above. Metal Oxide Varistor 150V, 80 Joule 0802-0273-0000 MOV130V, 38 Joule 0802-0304-0000 MOV275V, 75 Joule 0802-0266-0000 MOV275V, 140 Joule 0802-0405-0000

WATLOW Series 942 User's Manual

Appendix

Page 53

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. For very dirty or critical applications - use a microcomputer-regulated power supply or Uninterruptable Power Supply (U.P.S.). Don't fasten common mode line filters or filters with metal cases to metal that is at ground potential. This prevents ground loops and maintain filter effectiveness.

Noise Guidelines

L1 L2

Ground

L1 L2

Ground

D.M. Line Filter

Line Load

C.M. Line Filter

Line Load

Shield

Figure 42 Differential Mode Filter Wiring

NOTE: Keep filters 12" (305 mm) or less from the control. Minimize the line distance where noise can be reintroduced to the control.

Figure 43 Common Mode Filter Wiring

NOTE: To prevent ground loops do not fasten common mode line filters or filters with metal that is at ground potential. Doing so will reduce filter effectiveness.

L1 L2

Ground

Appendix

C.M. Line Filter

Line

Load

mov

D.M. Line Filter

Line Load

Figure 44 Combination Differential/Common Mode Filter Wiring

WATLOW Series 942 User's Manual

Page 54

Calibration

Figure 45 Entering the Calibration Menu.

Appendix 3

Before attempting to calibrate, make sure you have the proper equipment called for in each procedure.

Entering the Calibration Menu

In the Calibration Menu, various input signals must be supplied in order for the control to go through its auto calibration. The calibration menu can only be entered from the LOC parameter in the Setup menu. Press the UP/DOWN keys simultaneously for 3 seconds (± 1 second). The CAL parameter appears in the lower display with "no" in the upper display.

NOTE: Calibration values are not retained unless you are in the RUN mode. Do not enter the RUN mode until you are at the correct input parameters.

NOTE:

While in the Calibration Menu, all outputs are OFF, except the process output.

WARNING: Improper calibration will affect the accuracy of your control. A factory restore (rst) feature is provided at the end of the Calibration menu.

WATLOW Series 942 User's Manual Appendix

Any inadvertent change in the displayed data, when pressing the UP/DOWN keys, is ignored. Calibration values are not retained unless you are in the RUN mode. Press the UP/DOWN keys to change the upper display to “YES.” Press the MODE key to enter the calibration sequence.

Upon entering the calibration menu, the top display window indicates CAL. The upper display continues to indicate CAL (with the exception of calibration of the process outputs) while the operator walks through the entire calibration parameter list. While calibrating a process output, the upper display contains a numeric value to be slewed up or down until the output value is correct. The control uses the lower display to prompt the user as to what the input should be

The rSt parameter restores the factory calibration values to the Series 942.

If you calibrate your control incorrectly, you have the option to default to the original values. Once you leave the CAL menu, the values are entered.

The dFL parameter allows you to select either U.S. parameters which include displaying the proportional band in degrees or units, rate, reset, and °F. Or you can select SI (System International); those parameters displayed are proportional band in % of span, integral, derivative, and °C.

Once the information has been properly established and maintained for 5 to 10 seconds, the MODE key can be used to display the next parameter. After the final input is established, press the MODE key to return the unit to the configuration menu at the top of the parameter list.

Page 55

Calibration Menu

( )

CAL tCL tCH tC

rLO rHI

0 U 5 U 4 A 20A O1LO O1HI 4tYP O4LO O4HI

rst dISP

dFL MEM

YES to calibrate, No skips to display test.

( )

Input 0.00mV for low thermocouple input.

( )

Input 50.00mV (or 16.035 for r, S or b units) for high thermocouple input.

( )

Connect a "J" T/C compensator, with inputs shorted. T/C units only.

( )

Connect the JIS RTD low resistance per model number.

( )

Connect the JIS RTD high resistance per model number.

( )

Set the voltage source to 0.000 volts.

( )

Set the voltage source to 5.000 volts.

( )

Set the current source to 4.00mA.

( )

Set the current source to 20.00mA.

( )

Press the UP/DOWN keys until Output 1 reads process low.

( )

Press the UP/DOWN keys until Output 1 reads process high.

( )

Factory select for Output 4 type.

( )

Press the UP/DOWN keys until Output 4 reads process low.

( )

Press the UP/DOWN keys until Output 4 reads process high.

( )

Restores factory calibration values.

( )

Factory use only. Select US (prop. band in ° or units, rate, reset, °F) or

( )

SI (prop. band in % of span, integral, derivative, °C).

( )

Factory use only.

Calibration

Figure 46 Calibration Menu

NOTE: The Output 4 rELY parameter is for alarms or events, and the PrOC parameter is for retransmit output.

Appendix

WATLOW Series 942 User's Manual

Page 56

T/C Calibration

Thermocouple Field Calibration Procedure

Before attempting to calibrate, make sure you have the proper equipment called for in each procedure.

Equipment Required

• Type "J" or "R" reference compensator with reference junction at 32°F/0°C, or Type "J" or "R" thermocouple calibrator set at 32°F/0°C.

• Precision millivolt source, 0 - 50mV minimum range, 0.01mV resolution

NOTE: Before calibration on an installed control, make sure all data and parameters are documented. See the Setup and Operation Tables, and the Master Step Chart, Pages 27, 30 and 35.

NOTE: Not all parameters will appear. They are dependent on your unit type. Use only the steps that apply to your unit.

Setup And Calibration

1. Connect the AC line voltage L1, L2, and ground to the proper terminals on the 942. See Chapter 2.

2. Connect the millivolt source to Terminal #9 Negative and Terminal #7 Positive on the Series 942 terminal strip. Use regular 20 - 24 gauge wire.

3. Apply power to the unit and allow it to warm up for 15 minutes. After warm-

up put the unit in the CAL menu. See Page 54.

IMPORTANT:

When the RUN LED is ON the unit is automatically calibrating. Your sequence is VERY important. Always move to the next parameter before changing the calibration equipment. When you have completed all of the thermocouple calibration parameters, press the HOLD/RUN key twice. Failure to do so will result in inaccurate calibration values.

4. Press the HOLD/RUN key twice to enter the RUN mode. The unit is calibrating when the RUN LED is ON. Make sure the unit is in the RUN mode only when you are in the correct parameters. See Page 55.

5. At the tCL parameter, enter 0.00mV from the millivolt source to the control. Allow at least 10 seconds to stabilize. Press the MODE key.

6. At the "CH parameter, enter 50.00mV for type "J" units or 16.035mV for type "R" units from the millivolt source to the Series 942. Allow at least 10 seconds to stabilize. Press the MODE key.

7. At the tC parameter, disconnect the millivolt source, and connect the reference compensator or T/C calibrator to Terminal #9 Negative, and Terminal #7 Positive on the Series 942 terminal strip. Allow 10 seconds for the control to stabilize. The unit will leave the CAL mode if 1 minute passes between key activations. Press the HOLD/RUN key twice to exit the RUN mode. To conclude the thermocouple calibration, advance the MODE key to the next parameter or exit the Calibration menu by pressing the HOLD/RUN key twice.

WATLOW Series 942 User's Manual Appendix

Page 57

RTD Field Calibration Procedure

Before attempting any calibration procedure, make sure you have the proper equipment called for in each procedure.

Equipment Required

•1KΩ precision decade resistance box with 0.01 ohms resolution.

Setup And Calibration

1. Connect the AC line voltage L1, L2, and ground to the proper terminals of the 942. See Chapter 2.

2. Connect the decade resistance box to Terminal #4, 5 and 6 on the terminal strip. Use regular 20 - 24 gauge wire of the same length and type.

3. Apply power to the unit and allow it to warm up for 15 minutes. After warm-up put the unit in the CAL menu. See Page 54. Press the MODE key until the rLO parameter is displayed.

RTD Calibration

NOTE:

Before calibration on an installed control, make sure all data and parameters are documented. See the Setup and Operation Tables, and the Master Step Chart, Pages 27, 30 and 35.

IMPORTANT:

When the RUN LED is ON the unit is automatically calibrating. Your sequence is VERY important. Always move to the next parameter before changing the calibration equipment. When you have completed all of the RTD calibration parameters, press the HOLD/RUN key twice. Failure to do so will result in inaccurate calibration values.

4. Press the HOLD/RUN key twice to enter the RUN mode. The unit is calibrating when the RUN LED is ON. Make sure the unit is in the RUN mode only when you are in the correct parameters. See Page 55.

5. At the rLO parameter, set the decade resistance box to the correct low setting. See the table below. This parameter can be calibrated to JIS or DIN. Allow at least 10 seconds to stabilize. Press the MODE key.

Calibration Low High

942A-2XX0-0000 942A-3XX0-0000

6. At the rHI parameter, set the decade resistance box to the correct high setting. Allow at least 10 seconds to stabilize. The unit will leave the CAL mode if 1 minute passes between key activations. Press the HOLD/RUN key twice to exit the RUN mode. To conclude the RTD calibration, advance the MODE key to the next parameter or exit the Calibration menu by pressing the HOLD/RUN key twice.

1° 17.31 317.33

0.1° 59.59 177.13

NOTE: Not all parameters will appear. They are dependent on your unit type. Use only the steps that apply to your unit.

Table 7 RTD Settings.

Appendix

WATLOW Series 942 User's Manual

Page 58

0 - 5 Volt Input

0 - 5 Volt Input Field Calibration Procedure

Before attempting any calibration procedure, make sure you have the proper equipment called for in each procedure.

Equipment Required

• Precision voltage source 0-5 volt minimum range with 0.001 volt resolution.

NOTE:

Before calibration on an installed control, make sure all data and parameters are documented. See the Setup and Operation Tables, and the Master Step Chart, Pages 27, 30 and 35.

NOTE: Not all parameters will appear. They are dependent on your unit type. Use only the steps that apply to your unit.

Setup And Calibration

1. Connect the AC line voltage L1, L2, and ground to the proper terminals on

the 942. See Chapter 2.

2. Connect the voltage/current source to Terminal #1 and #3 on the Series

942 terminal strip. Use regular 20 - 24 gauge wire.

3. Apply power to the unit and allow it to warm up for 15 minutes. After

warm-up put the unit in the CAL menu. See Page 54. Press the MODE key until the OU parameter is displayed.

IMPORTANT:

When the RUN LED is ON the unit is automatically calibrating. Your sequence is VERY important. Always move to the next parameter before changing the calibration equipment. When you have completed all of the 0 - 5 Volt input calibration parameters, press the HOLD/RUN key twice. Failure to do so will result in inaccurate calibration values.

4. Press the HOLD/RUN key twice to enter the RUN mode. The unit is

calibrating when the RUN LED is ON. Make sure the unit is in the RUN mode only when you are in the correct parameters. See Page 55.

5. At the 0U parameter, set the voltage/current source to 0.000volts. Allow

at least 10 seconds to stabilize. Press the MODE key.

6. At the 5U parameter, set the voltage/current source to 5.000 volts. Allow

at least 10 seconds to stabilize. The unit will leave the CAL mode if 1 minute passes between key activations. Press the HOLD/RUN key twice to exit the RUN mode. To conclude the 0 - 5 Volt input calibration, advance the MODE key to the next parameter or exit the Calibration menu by pressing the HOLD/RUN key twice.

WATLOW Series 942 User's Manual Appendix

Page 59

4-20mA Input Field Calibration Procedure

Before attempting any calibration procedure, make sure you have the proper equipment called for in each procedure.

Equipment Required

• Precision current source 0-20mA minimum range with 0.01 mA resolution.

4-20mA Input

Setup And Calibration

1. Connect the AC line voltage L1, L2, and ground to the proper terminals on

the Series 942. Jumper for correct line voltage. See Chapter 2.

2. Connect the voltage/current source to Terminal #1 and #3. Jumper

Terminal #2 to #3 on the Series 942 terminal strip. Use regular 20 - 24 gauge wire.

3. Apply power to the unit and allow it to warm up for 15 minutes. After

warm-up put the unit in the CAL menu. See Page 54. Press the MODE key until the 4A parameter is displayed.

IMPORTANT:

When the RUN LED is ON the unit is automatically calibrating. Your sequence is VERY important. Always move to the next parameter before changing the calibration equipment. When you have completed all of the 4 - 20mA input calibration parameters, press the HOLD/RUN key twice. Failure to do so will result in inaccurate calibration values.

4. Press the HOLD/RUN key twice to enter the RUN mode. The unit is

calibrating when the RUN LED is ON. Make sure the unit is in the RUN mode only when you are in the correct parameters. See Page 55.

NOTE

Before calibration on an installed control, make sure all data and parameters are documented. See the Setup and Operation Tables, and the Master Step Chart, Pages 27, 30 and 35.

NOTE: Not all parameters will appear. They are dependent on your unit type. Use only the steps that apply to your unit.

5. At the 4A parameter, set the mA source to 4.00mA. Allow at least 10

seconds to stabilize. Press the MODE key.

6. At the 20A parameter, set the voltage/current source to 20.00mA. Allow

at least 10 seconds to stabilize. The unit will leave the CAL mode if 1 minute passes between key activations. Press the HOLD/RUN key twice to exit the RUN mode. To conclude the 4-20mA input calibration, advance the MODE key to the next parameter or exit the Calibration menu by pressing the HOLD/RUN key twice.

Appendix

WATLOW Series 942 User's Manual

Page 60

0-5/0-10 V olt Output

0-5 or 0-10 Volt Output Field Calibration Procedure

Before attempting any calibration procedure, make sure you have the proper equipment called for in each procedure.

Equipment Required

• 20KΩ, 1/4 watt, 10% resistor

• 4 1/2 digit Digital Multimeter.

Setup and Calibration

1. Connect the AC line voltage L1, L2, and ground to the proper terminals of

NOTE

Before calibration on an installed control, make sure all data and parameters are documented. See the Setup and Operation Tables, and the Master Step Chart, Pages 27, 30 and 35.

2. Connect the multimeter across the 20KΩ resistor to Terminal #17 (+) and

3. Apply power to the unit and allow it to warm up for 15 minutes. After

IMPORTANT:

When the RUN LED is ON the unit is automatically calibrating. Your sequence is VERY important. Always move to the next parameter before changing the calibration equipment. When you have completed all of the 0 - 5 Volt output calibration parameters, press the HOLD/RUN key twice. Failure to do so will result in inaccurate calibration values.

the 942. See Chapter 2.

#18 (-)for 0-5Volt units on the Series 942 terminal strip. Use Terminal #17 (+) and #16 (-) for 0-10Volt units. Use regular 20 - 24 gauge wire.

warm-up put the unit in the CAL menu. See Page 54. Press the MODE key until the O1LO parameter is displayed.

4. Press the HOLD/RUN key twice to enter the RUN mode. The unit is calibrating when the RUN LED is ON. Make sure the unit is in the RUN mode only when you are in the correct parameters. See Page 55.

5. At the O1LO parameter, the multimeter should read approximately 0.000V. Allow at least 10 seconds to stabilize.

6. Use the UP/DOWN keys (reverse acting) to adjust the reading on the multimeter for -0.2V ±0.1V on 0-5Volt units and 0.0V ± 0.1V for 0-10Volt units. Press the MODE key.

7. At the O1HI parameter, the multimeter should read approximately 5.000V. Allow at least 10 seconds to stabilize. The unit will leave the CAL mode if 1 minute passes between key activations.

8. Use the UP/DOWN keys (reverse acting) to adjust the reading on the multimeter for 5.2V ± 0.1V for 0-5Volt units and 5.0V ± 0.1V for 0-10Volt units.

9. Press the HOLD/RUN key twice to exit the RUN mode. To conclude the output calibration, advance the MODE key to the next parameter or exit the Calibration menu by pressing the HOLD/RUN key twice.

WATLOW Series 942 User's Manual Appendix

Page 61

0-20/4-20mA Output

0-20/4-20mA Output Field Calibration Procedure

Before attempting any calibration procedure, make sure you have the proper equipment called for in each procedure.

Equipment Required

• 470Ω, 1/2 watt 10% resistor.

• 4 1/2 digit Digital Multimeter.

Setup and Calibration

1. Connect the AC line voltage L1, L2, and ground to the proper terminals of the 942. See Chapter 2.

2. Connect the multimeter in series with the 470Ω resistor to Terminal #17 (+) and #18 (-) for 4-20mA units, on the Series 942 terminal strip. Use Terminal # 17 (+) and #16 (-) for 0-20mA units. Use regular 20 - 24 gauge wire.

3. Apply power to the unit and allow it to warm up for 15 minutes. After warm-up put the unit in the CAL menu. See Page 54. Press the MODE key until O1LO parameter is displayed.

IMPORTANT:

When the RUN LED is ON the unit is automatically calibrating. Your sequence is VERY important. Always move to the next parameter before changing the calibration equipment. When you have completed all of the 4-20mA output calibration parameters, press the HOLD/RUN key twice. Failure to do so will result in inaccurate calibration values.

NOTE

Before calibration on an installed control, make sure all data and parameters are documented. See the Setup and Operation Tables, and the Master Step Chart, Pages 27, 30 and 35.

4. Press the HOLD/RUN key twice to enter the RUN mode. The unit is calibrating when the RUN LED is ON. Make sure the unit is in the RUN mode only when you are in the correct parameters. See Page 55.

5. At the O1LO parameter, the multimeter should read approximately 0mA for 0-20mA units and 4mA for 4-20mA units. Allow at least 10 seconds to stabilize.

6. Use the UP/DOWN keys (reverse acting) to adjust the reading on the multimeter for 0.0mA ± 0.10mA on 0-20mA units, and 3.85mA ± 0.10mA on 4-20mA units. Press the MODE key.

7. At the O1HI parameter, the multimeter should read approximately 20mA. Allow at least 10 seconds to stabilize. The unit will leave the CAL mode if 1 minute passes between key activations.

8. Use the UP/DOWN keys (reverse acting) to adjust the reading on the multimeter for 20.0mA ± 0.10mA on 0-20mA units and 20.15mA ±0.10mA on 4-20mA units.

9. Press the HOLD/RUN key twice to exit the RUN mode. To conclude the output calibration, advance the MODE key to the next parameter or exit the Calibration menu by pressing the HOLD/RUN key twice. Press the HOLD/ RUN key twice to exit the RUN mode.

Appendix

WATLOW Series 942 User's Manual

Page 62

0-5V Retransmit

0 - 5 Volt Retransmit Field Calibration Procedure

Before attempting any calibration procedure, make sure you have the proper equipment called for in each procedure.

Equipment Required

• 20KΩ, 1/4 watt, 10% resistor.

• 4 1/2 digit Digital Multimeter.

Setup and Calibration

NOTE

Before calibration on an installed control, make sure all data and parameters are documented. See the Setup and Operation Tables, and the Master Step Chart, Pages 27, 30 and 35.

1. Connect the AC line voltage L1, L2, and ground to the proper terminals of the 942. See Chapter 2.

2. Connect the multimeter across the 20KΩ resistor to Terminal #25 Positive and #24 Negative on the Series 942 terminal strip. Use regular 20 - 24 gauge wire.

3. Apply power to the unit and allow it to warm up for 15 minutes. After warm-up put the unit in the CAL menu. See Page 54. Press the MODE key until the O4LO parameter is displayed.

IMPORTANT:

When the RUN LED is ON the unit is automatically calibrating. Your sequence is VERY important. Always move to the next parameter before changing the calibration equipment. When you have completed all of the 0 - 5 Volt retransmit calibration parameters, press the HOLD/RUN key twice. Failure to do so will result in inaccurate calibration values.

4. Press the HOLD/RUN key twice to enter the RUN mode. The unit is calibrating when the RUN LED is ON. Make sure the unit is in the RUN mode only when you are in the correct parameters. See Page 55.

5. At the O4LO parameter, the multimeter should read approximately 0V. Allow at least 10 seconds to stabilize.

6. Use the UP/DOWN keys (reverse acting) to adjust the reading on the multimeter for 0.0 volts. Press the MODE key.

7. At the O4HI parameter, the multimeter should read approximately 5V. Allow at least 10 seconds to stabilize. The unit will leave the CAL mode if 1 minute passes between key activations.

8. Use the UP/DOWN keys (reverse acting) to adjust the reading on the multimeter for 5.0 volts. Press the MODE key.

9. Press the HOLD/RUN key twice to exit the RUN mode. To conclude the 0 - 5 volt retransmit calibration, advance the MODE key to the next parameter or exit the Calibration menu by pressing the HOLD/RUN key twice.

WATLOW Series 942 User's Manual Appendix

Page 63

4-20mA Retransmit Field Calibration Procedure

Before attempting any calibration procedure, make sure you have the proper equipment called for in each procedure.

Equipment Required

• 470Ω, 1/2 watt 10% resistor.

• 4 1/2 digit Digital Multimeter.

Setup and Calibration

4-20mA Retransmit

1. Connect the AC line voltage L1, L2, and ground to the proper terminals of the 942. See Chapter 2.

2. Connect the multimeter in series with the 470Ω resistor to Terminal #25 Positive and #24 Negative on the Series 945 terminal strip. Use regular 20 - 24 gauge wire.

3. Apply power to the unit and allow it to warm up for 15 minutes. After warm-up put the unit in the CAL menu. See Page 54. Press the MODE key until the O4LO parameter is displayed.

IMPORTANT:

When the RUN LED is ON the unit is automatically calibrating. Your sequence is VERY important. Always move to the next parameter before changing the calibration equipment. When you have completed all of the 4 - 20mA retransmit calibration parameters, press the HOLD/RUN key twice. Failure to do so will result in inaccurate calibration values.

4. Press the HOLD/RUN key twice to enter the RUN mode. The unit is calibrating when the RUN LED is ON. Make sure the unit is in the RUN mode only when you are in the correct parameters. See Page 55.

5. At the O4LO parameter, the multimeter should read approximately 4mA. Allow at least 10 seconds to stabilize.

NOTE

Before calibration on an installed control, make sure all data and parameters are documented. See the Setup and Operation Tables, and the Master Step Chart, Pages 27, 30 and 35.

6. Use the UP/DOWN keys (reverse acting) to adjust the reading on the multimeter for 4.00mA. Press the MODE key.

7. At the O4HI parameter, the multimeter should read approximately 20mA. Allow at least 10 seconds to stabilize. The unit will leave the CAL mode if 1 minute passes between key activations.

8. Use the UP/DOWN keys (reverse acting) to adjust the reading on the multimeter for 20.00mA.

9. Press the HOLD/RUN key twice to exit the RUN mode. To conclude the 4 - 20mA retransmit calibration, advance the MODE key to the next parameter or exit the Calibration menu by pressing the HOLD/RUN key twice.

Appendix

WATLOW Series 942 User's Manual

Watlow 942 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Series 942

Contents

Starting Out

How to Open the 942

How to Set the DIP Switches

Installation

Dimensions

Power Wiring

Input Wiring

Output 1 Wiring

Output 2 Wiring

Auxiliary Wiring

Wiring Example

Keys/Displays

Setup

Operation

PROGRAM Menu

Program

RUN Menu

Master Step Chart

Events

Jumploop

Sample Program

Tuning

Chapter 6

Auxiliary

Alarms

Error Codes

Errors/Outputs

Specifications

Appendix 1

Model No.

Appendix 2

Install - Wire

Wiring Guide

Noise Guidelines

Calibration

Appendix 3

T/C Calibration

RTD Calibration

0 - 5 Volt Input

4-20mA Input

0-5/0-10 V olt Output

0-20/4-20mA Output

0-5V Retransmit

4-20mA Retransmit