PRECISION DIGITAL PD755, PD757, PD756 Instruction Manual

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PRECISION DIGITAL CORPORATION

19 Strathmore Road • Natick MA 01760 USA Tel (800) 343-1001 • Fax (508) 655-8990

www.predig.com

DIGITAL METERS

Large Display Temperature Meters Instruction Manual

• Handles Thermocouple and RTD Inputs with Simplicity

• J, K, T, E, R and S Thermocouples

• 100 Ω Platinum RTDs (0.00385 or 0.00392 curve)

• Large Display Readouts: 2.3", 1.0" and 0.8" High

• Display Resolution Thermocouples: 1°, Type T T/C Displayed to 1° or 0.1° RTDs Resolution: 1° or 0.1°, Field Selectable

• Displays °F or °C, Field Selectable

• No Calibration Necessary – Factory Calibrated

• Maximum/Minimum Temperature Display

• Input Offset Adjustment

• NEMA 4X and Explosion-Proof Enclosures

• 115 or 230 VAC Power, Field Selectable

• 24 VDC Powered Models, Optional

• 24 VDC Isolated Power Supply Standard on AC Models

• 4 Visual Alarm Points with Front Panel LED Status Indication

• 2 or 4 Relays and/or 4-20 mA Output Options

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Large Display Temperature Meters Instruction Manual

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Large Display Temperature Meters Instruction Manual

Table of Contents

INTRODUCTION ----------------------------------------------------------------------- 7

Ordering Information ------------------------------------------------------------------------7

Model PD755 --------------------------------------------------------------------------------7 Model PD756 --------------------------------------------------------------------------------7 Model PD757 --------------------------------------------------------------------------------8 Accessories ----------------------------------------------------------------------------------8

Safety Notice ----------------------------------------------------------------------------------- 9 Specifications-------------------------------------------------------------------------------- 10

Basic Temperature Meter -------------------------------------------------------------- 10 Options -------------------------------------------------------------------------------------- 12

Display Functions and Messages----------------------------------------------------- 14

SETUP AND PROGRAMMING -------------------------------------------------- 15

Overview--------------------------------------------------------------------------------------- 15 Disassembling the Meter----------------------------------------------------------------- 16

Disassembling the PD755 -------------------------------------------------------------- 16 Disassembling the PD756 -------------------------------------------------------------- 16 Disassembling the PD757 -------------------------------------------------------------- 17

Reassembling the Meter ----------------------------------------------------------------- 18

Reassembling the PD755 -------------------------------------------------------------- 18 Reassembling the PD756 -------------------------------------------------------------- 18 Reassembling the PD757 -------------------------------------------------------------- 18

Jumper Configuration--------------------------------------------------------------------- 19

Input Selection and Lockout Jumpers (Main PCB)------------------------------- 19 Relay Acknowledge Enable (Display PCB) ---------------------------------------- 19 Fail-Safe Operation of Relays (Options PCB)------------------------------------- 19

Power Selection----------------------------------------------------------------------------- 20

Overview------------------------------------------------------------------------------------ 20 Changing from 115 to 230 VAC Power --------------------------------------------- 20 Labeling Meter for 115 VAC, 230 VAC or 24 VDC------------------------------- 21

Connections---------------------------------------------------------------------------------- 21

Overview------------------------------------------------------------------------------------ 21 Wiring Instructions------------------------------------------------------------------------ 22 Power Connections ---------------------------------------------------------------------- 23 Signal Connections----------------------------------------------------------------------- 24 Enter, Acknowledgement, and Hold Connections -------------------------------- 26 Optional Relays & 4-20 mA Output Terminals ------------------------------------ 27 Isolated 4-20 mA Output Transmitter Connections ------------------------------ 28

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Large Display Temperature Meters Instruction Manual

Programming -------------------------------------------------------------------------------- 29

Overview------------------------------------------------------------------------------------ 29

Select Type of Input Signal T/C or RTD----------------------------------------- 29 ENTER Button Functionality ------------------------------------------------------- 30 ACK Button Functionality ----------------------------------------------------------- 30 Magnetic Reed Switch Functionality --------------------------------------------- 30

General Programming Description --------------------------------------------------- 31

Five Basic Digit/Display-Setting Instructions ----------------------------------- 31

Programming the Basic Meter--------------------------------------------------------- 32

Selecting Type of T/C or RTD (TYPE) -------------------------------------------- 33 Select °F or °C (f or C) ------------------------------------------------------------ 33

Alarm Setup and Set Points Programming----------------------------------------- 34

Overview -------------------------------------------------------------------------------- 34 Set Relays for Manual or Automatic Reset ------------------------------------- 34 Set Relays for Fail-Safe Operation ----------------------------------------------- 34 Setup for Latching or Non-Latching Relays (SetuP) ------------------------- 35 Alarm Set and Reset Points Programming ------------------------------------- 36 Programming Alarm Points Using Set Points (setpts) Menu ------------- 37 Alarm Set and Reset Programming Confirmation ---------------------------- 37

Isolated 4-20 mA Output Transmitter Option -------------------------------------- 38

4-20 mA Output Programming (output) ---------------------------------------- 38 4-20 mA Output Programming Confirmation ----------------------------------- 38

Input Offset Adjustment (OFFSEt) ---------------------------------------------------- 39 Lockout Jumper --------------------------------------------------------------------------- 39

OPERATION -------------------------------------------------------------------------- 40

Overview--------------------------------------------------------------------------------------- 40 Basic Meter Operation -------------------------------------------------------------------- 41

Overview------------------------------------------------------------------------------------ 41 Maximum/Minimum Temperature Display------------------------------------------ 41

Relays Operation --------------------------------------------------------------------------- 42

Overview------------------------------------------------------------------------------------ 42 Relays Auto Initialization---------------------------------------------------------------- 42 Fail-Safe Operation ---------------------------------------------------------------------- 42 Front Panel LEDs------------------------------------------------------------------------- 43 Acknowledging Relays ------------------------------------------------------------------ 45 Switching Inductive Loads-------------------------------------------------------------- 46 4-20 mA Output Operation ------------------------------------------------------------- 46

RECALIBRATION (CALIB) -------------------------------------------------------- 47

Calibration Error (error) --------------------------------------------------------------- 47

Recommended Calibration Points ---------------------------------------------------- 48

Minimum Input Span--------------------------------------------------------------------- 48

Calibration Verification ------------------------------------------------------------------- 48

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Large Display Temperature Meters Instruction Manual

INSTALLATION ---------------------------------------------------------------------- 49

Wall Mounting Instructions ------------------------------------------------------------- 49

PD755 Mounting -------------------------------------------------------------------------- 49 PD756 Mounting -------------------------------------------------------------------------- 49 PD757 Mounting -------------------------------------------------------------------------- 49

Panel Mounting Instructions------------------------------------------------------------ 50

PD755 Panel Mounting Instructions ------------------------------------------------- 50 PD757 Panel Mounting Instructions ------------------------------------------------- 51

Pipe Mounting Instructions for PD755 and PD756 ------------------------------ 53 Explosion-Proof Control Stations----------------------------------------------------- 55

OPTION CARD REMOVAL & INSTALLATION ----------------------------- 56

Option Card Installation in PD755 ---------------------------------------------------- 56 Option Card Installation in PD756 ---------------------------------------------------- 58 Option Card Installation in PD757 ---------------------------------------------------- 59

MODEL SENSITIVE ILLUSTRATIONS ---------------------------------------- 60

Removing the Display PCB ------------------------------------------------------------- 60 Locations of Connections and Jumpers-------------------------------------------- 61 Jumper Arrays and Status LEDs ------------------------------------------------------ 63 Front Panel Displays ---------------------------------------------------------------------- 65 Overall Dimensions ------------------------------------------------------------------------ 66 Wall Mounting Dimensions-------------------------------------------------------------- 67

PROGRAMMED PARAMETER SETTINGS ---------------------------------- 69 OTHER PRECISION DIGITAL PRODUCTS---------------------------------- 70

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Large Display Temperature Meters Instruction Manual

List of Figures

Figure 1. Input Power Label ................................................................. 21

Figure 2. Input Power Connections for 756 and 757 .......................... 23

Figure 3. Four-Wire RTD Connections ................................................ 24

Figure 4. Three-Wire RTD Connections............................................... 24

Figure 5. Two-Wire RTD Connections ................................................. 25

Figure 6. Thermocouple Connections................................................. 25

Figure 7. External Control Connections.............................................. 26

Figure 8. Relay and 4-20 mA Output Terminals.................................. 27

Figure 9. Output Loop Powered by Meter ........................................... 28

Figure 10. Output Loop Powered from External Power Supply........... 28

Figure 11. JP1 Input Signal Selection Array. ......................................... 29

Figure 12. Reed Switch Operation.......................................................... 30

Figure 13. AC and DC Loads Protection ................................................ 46

Figure 14. Low Voltage DC Loads Protection ....................................... 46

Figure 15. PD755 Panel Mounting .......................................................... 50

Figure 16. PD757 Panel Mounting .......................................................... 51

Figure 17. PD757 Panel Mounting Cutout Dimensions......................... 51

Figure 18. 755 Pipe Mounting Assembly................................................ 53

Figure 19. 756 Pipe Mounting Assembly................................................ 53

Figure 20. Pipe Mounting Plate............................................................... 54

Figure 21. Explosion-proof Control Station........................................... 55

Figure 22. Removing the PD755 Display PCB ....................................... 56

Figure 23. PD755 Options PCB Standoffs Location.............................. 56

Figure 24. PD755 Options PCB Installation ........................................... 57

Figure 25. PD756 Option PCB Installation ............................................. 58

Figure 26. PD756 Option PCB Installed ................................................. 58

Figure 27. PD757 Option PCB Installation ............................................. 59

Figure 28. Removing the Display PCB on PD755.................................. 60

Figure 29. Removing the Display PCB on PD756.................................. 60

Figure 30. Removing the Display PCB on PD757.................................. 61

Figure 31. PD755 Connectors and Jumper Location ............................ 61

Figure 32. PD756 Connectors and Jumper Location ............................ 62

Figure 33. PD757 Connectors and Jumper Location ............................ 62

Figure 34. PD755 Jumper Arrays and Status LED Identification ......... 63

Figure 35. PD756 Jumper Arrays and Status LED Identification ......... 63

Figure 36. PD757 Jumper Arrays and Status LED Identification ......... 64

Figure 37. PD755 Front Panel Display.................................................... 65

Figure 38. PD756 Front Panel Display.................................................... 65

Figure 39. PD757 Front Panel Display.................................................... 65

Figure 40. PD755 Overall Dimensions.................................................... 66

Figure 41. PD756 Overall Dimensions.................................................... 66

Figure 42. PD757 Overall Dimensions.................................................... 67

Figure 43. PD755 Wall Mounting Dimensions ....................................... 67

Figure 44. PD755 Wall Mounting Screw Installation ............................. 67

Figure 45. PD756 Wall Mounting Dimensions ....................................... 68

Figure 46. PD757 Wall Mounting Dimensions ....................................... 68

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Large Display Temperature Meters Instruction Manual

INTRODUCTION

The Large Display Temperature Meters are housed in rugged, NEMA 4X or explosion-proof enclosures. These meters handle temperature display and alarm applications with simplicity, accuracy, and reliability. They

accept the common thermocouples J, K, T, E, R, and S or 100 Ω platinum RTDs. Options include up to 4 relays for alarms as well as an isolated 4-20 mA transmitter output. An isolated 24 VDC power supply is available as standard feature on AC powered models to power the transmitter output.

Ordering Information

Model PD755

115/230 VAC MODEL

24 VDC MODEL

DESCRIPTION Option

Card*

PD755-N PD755-2-N No Options PD755-44 PD755-2-44 2 Relays PD474 PD755-45 PD755-2-45 4-20 mA Output PD475 PD755-46 PD755-2-46 2 Relays + 4-20 mA Output PD476 PD755-47 PD755-2-47 4 Relays PD477 PD755-48 PD755-2-48 4 Relays + 4-20 mA Output PD478

Model PD756

115/230 VAC MODEL

24 VDC MODEL

DESCRIPTION Option

Card*

PD756-N PD756-2-N No Options PD756-44 PD756-2-44 2 Relays PD474 PD756-45 PD756-2-45 4-20 mA Output PD475 PD756-46 PD756-2-46 2 Relays + 4-20 mA Output PD476 PD756-47 PD756-2-47 4 Relays PD477 PD756-48 PD756-2-48 4 Relays + 4-20 mA Output PD478

*Option Cards (When Ordered Separately)

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Large Display Temperature Meters Instruction Manual

Model PD757

115/230 VAC MODEL

24 VDC MODEL

DESCRIPTION Option

Card*

PD757-N PD757-2-N No Options PD757-34 PD757-2-34 2 Relays PD374 PD757-35 PD757-2-35 4-20 mA Output PD375 PD757-36 PD757-2-36 2 Relays + 4-20 mA Output PD376 PD757-37 PD757-2-37 4 Relays PD377 PD757-38 PD757-2-38 4 Relays + 4-20 mA Output PD378

*Option Cards (When Ordered Separately)

Accessories

Control Stations

Model Switches Labels

PDA2451-E 1 ENTER PDA2451-A 1 ACK PDA2451-R 1 RESET PDA2452-EA 2 ENTER and ACK PDA2452-ER 2 ENTER and RESET PDA2453-EAR 3 ENTER, ACK, and RESET

PDA-MAG Magnet Assembly for PD656 & PD756 PDA6504 Panel Mounting Kit for PD757** PDA6554 Panel Mounting Kit for PD755** PDA6545 2" Pipe Mounting Kit for PD755 and PD756

** These panel mounting kits are not intended to provide waterproof protection to

the panel.

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Large Display Temperature Meters Instruction Manual

Safety Notice

CAUTION: Read complete

instructions prior to installation and operation of the meter.

WARNING: Risk of electric shock.

Observe all safety regulations. Electrical wiring should be performed in accordance with all applicable national, state, and local codes to prevent damage to the meter and ensure personnel safety.

It is recommended to use this meter in a fail-safe system that accommodates the possibility of meter failure or power failure.

WARNING Hazardous voltages exist within enclosure. Installation and service should be performed only by trained service personnel.

AVERTISSEMENT Les pièces à l'intérieur du boîtier portent des tensions dangereuses. Seules des personnes qualifiées et bien entrainées devraient entreprondre l'ótalonnage et la maintenance.

Disclaimer

The information contained in this document is subject to change without notice. Precision Digital makes no representations or warranties with respect to the contents hereof, and specifically disclaims any implied warranties of merchantability or fitness for a particular purpose.

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Large Display Temperature Meters Instruction Manual

Specifications

Except where noted all specifications apply to operation at +25°C.

Basic Temperature Meter

INPUTS

Field selectable: type J, K, T, E, R, or S thermocouples with 1° resolution; type T to 0.1°; 100 Ω platinum RTD (0.00385 or

0.00392 curve) to 1° or 0.1° resolution.

DISPLAY

4½ digit, high efficiency red LED, automatic lead zero blanking, F or C displayed to indicate Fahrenheit or Celsius. Digit Size:

PD755– 1.0" (25.4 mm) high PD756– 0.8" (20.3 mm) high PD757– 2.3" (58.0 mm) high

COLD JUNCTION REFERENCE

Automatic, fixed, no user calibration needed.

INPUT IMPEDANCE

Greater than 100 kΩ

LOCKOUT

Jumper JP2, located on Main PCB, restricts modification of set values.

ACCURACY

Input Type

Range Accuracy

Type J T/C

–328° to 1382° F –200° to 750°C

±2°F ±1°C

Type K T/C

–328° to 2498°F –200° to 1330°C

±2°F ±1°C

Type T T/C

–330.0° to 760.0°F –200.0° to 404.0°C

±2°F ±1°C

Type E T/C

–328° to 1832°F –200° to 1000°C

±2°F ±1°C

Type R T/C

32° to 3213°F 0° to 1767°C

±5°F ±3°C

Type S T/C

40° to 3214°F 4° to 1768°C

±6°F ±3°C

100 Ω RTD –328.0° to 1382.0°F

–200.0° to 750.0°C

±0.7°F ±0.4°C

RECALIBRATION

All ranges are calibrated at the factory. Recalibration is recommended at least every 12 months.

INPUT OFFSET

Programmable to ±100% FS display. This parameter allows the user to apply an offset value to the input temperature being displayed.

SENSOR BREAK DETECTION

Open sensor circuit indicated by display flashing OPEn. All relays and alarm status LEDs go to alarm state.

MAX/MIN TEMPERATURE DISPLAY

The maximum and minimum temperature reached by the process is stored in memory until cleared (reset) by the user or until power to the meter is turned off. Max/min values are displayed via the ENTER button and

HI t, LO t menu functions, respectively.

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Large Display Temperature Meters Instruction Manual

ALARM POINTS

Four, any combination of high or low alarms. Latching or nonlatching.

ALARM POINT DEADBAND

0-100% of full scale, user selectable

ALARM STATUS INDICATION

Front panel LED

NON-VOLATILE MEMORY

All programming values are stored in non-volatile memory for a minimum of ten years if power is lost.

NORMAL MODE REJECTION

64 dB at 50/60 Hz

POWER

AC Power:115 VAC or 230 VAC ± 10%, 50/60 Hz, 12 VA DC Power: 22-28 VDC, 12 watts maximum

ENVIRONMENTAL

Operating temperature range: 0 to +65°C Storage temperature range: -40 to +85°C Relative humidity: 0 to 90% non-condensing

CONNECTIONS

Removable screw terminal blocks accept 22 to 12 AWG wire.

ENCLOSURE

PD755

Impact-resistant glass filled polycarbonate, NEMA 4X, modified specifically for PDC; two holes for ½" conduit provided at base.

PD756

Explosion-proof sand-cast aluminum – 0.3% max. copper content, NEMA 3, 4, 7, 9. For use in hazardous locations Class I Groups C & D, Class II Groups E, F & G (suitable for Division 1 and Division 2). Two ¾" NPT holes provided at opposite sides. Up to four holes can be provided for an additional charge.

PD757

Die cast aluminum, NEMA 4X, modified specifically for PDC; four holes for ½" conduit provided at base, 3 plugs provided.

MOUNTING

PD755

Enclosure contains four holes for wall mounting. Panel mounting and pipe mounting kits available.

PD756

Enclosure contains four 7/16" holes for wall-mounting, pipe mounting kit available.

PD757

Enclosure contains four ¼" holes for wall-mounting. Panel mounting kit available.

OVERALL DIMENSIONS

PD755

6.7" x 5.5" x 3.7" (170 mm x 140 mm x 95 mm)

PD756

8.0" x 8.0" x 5.7" (203 mm x 203 mm x 145 mm)

PD757

4.9" x 14.3" x 3.2" ( 125 mm x 362 mm x 81 mm)

WEIGHT

PD755

3.8 lbs (1.73 kg)

PD756

14.6 lbs (6.6 kg)

PD757

7.0 lbs (3.2 kg)

WARRANTY

1 year parts and labor

EXTENDED WARRANTY

Warranty may be extended an additional 12 months by returning the Product Registration Form within 2 months from date of purchase. Go to www.predig.com for online registration.

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Large Display Temperature Meters Instruction Manual

Options

Relays

RATING

2 or 4 SPDT (form C); rated 2 Amp @ 30 VDC or 2 Amp @ 250 VAC resistive load;

/14 HP @ 125 / 250 VAC for inductive loads.

RESET

User select via JP5 jumper array and SetuP menu.

Automatic reset only.

Manual reset only, at any time.

Automatic plus manual reset at any time.

Manual reset only after alarm condition has been corrected.

Automatic reset: Relays will automatically reset when the input passes the reset point.

Manual reset: It can be performed via user supplied external contact closure at terminals AK and CM or front panel ACK button. Manual reset resets all manually resetable relays.

BUILT-IN SUPPRESSION

A built-in suppressor (snubber) to prolong the life of the relays protects each relay contact. The suppressor provides a degree of protection against electrical noise caused by inductive loads. Suppressor value, .01 µF/470 Ω , 250 VAC.

DEADBAND

0-100% of full scale, user selectable.

FAIL-SAFE OPERATION

Relay coils are energized in non-alarm condition. In case of power failure, relays will go to alarm state. Fail-safe operation may be disabled, by removing jumper J5 located on the Options PCB.

SENSOR BREAK DETECTION

Open sensor circuit indicated by display flashing OPEn. All relays and alarm status LEDs go to alarm state.

AUTO INITIALIZATION

When power is applied to the meter, the relays always reflect the state of the input to the meter.

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Large Display Temperature Meters Instruction Manual

Isolated 4-20 mA Transmitter Output

CALIBRATION RANGE

The transmitter output can be calibrated so that a 4 mA output is produced for any number displayed on the meter. The 20 mA output may correspond to any number displayed on the meter (larger or smaller). However, best results are obtained with a 500-count difference between 4 and 20 mA displays. The output will be linear (example: 4 mA = 0°, 20 mA = 1000°, output is 6 mA at 125°.)

ACCURACY

± 0.1% F.S., ± .004 mA @ 25°C

NO EQUIPMENT NEEDED

The 4-20 mA output from the Temperature Meter is calibrated via the ENTER button without the use of a calibrator.

OUTPUT LOOPPOWER

24 VDC ± 5% @ 20 mA, regulated. Maximum loop resistance is 1200 Ω . Isolated from input signal.

ISOLATION

500 VDC or peak AC, input-to-output or input/output-to-power line.

EXTERNAL LOOP-POWER SUPPLY

35 VDC maximum

OUTPUT LOOP RESISTANCE

Power supply

Minimum loop resistance

Maximum loop resistance

24 VDC

10 Ω 600 Ω

35 VDC (external)

600 Ω 1000 Ω

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Large Display Temperature Meters Instruction Manual

Display Functions and Messages

The meter displays various functions and messages during operation and programming. The following table shows the various displayed functions and messages with their description.

Display Parameter Description/Comments

9999F

Out of range

Indicates the input signal exceeds the full-scale range of the meter.

CALIb

Calibration

Calibrates meter using a calibrated signal source.

CLEAr

Clear

Clears (resets) maximum or minimum temperatures reached by the process.

DIA9

Diagnostic

Displays parameter settings one at a time for diagnostic purposes. Setting can not be changed under this function.

Error

Indicates calibration was not successful.

F or C

°F or °C

Type of scale to be used Fahrenheit or Celsius.

HI t

High temperature Displays maximum temperature reached by the

process since last cleared (reset).

InPt 1

Input 1 Sets low input calibration (low input signal must be

applied to the meter).

InPt 2

Input 2 Sets high input calibration (high input signal must

be applied to the meter).

LO t

Low temperature Displays minimum temperature reached by the

process since last cleared (reset).

LatCk

Latch Sets alarm set points for latching or non-latching

relay operation.

OFFSET

Input offset

Adds or subtracts a programmed offset value to the input.

Open

Indicates open sensor circuit.

outPut

Output

Sets the optional 4-20 mA output values.

Set 1

Set point 1

Sets operation for Set point 1.

Set 2

Set point 2

Sets operation for Set point 2.

Set 3

Set point 3

Sets operation for Set point 3.

Set 4

Set point 4

Sets operation for Set point 4.

SetPtS

Set points

Sets alarm set and reset point values.

Setup

Sets operation of set points for latching or nonlatching mode.

Type

Sets type of thermocouple or RTD to be used as the input. Jumper JP1 must be configured accordingly.

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Large Display Temperature Meters Instruction Manual

SETUP AND PROGRAMMING

Overview

To setup and program the Digital Temperature Meter, it is necessary to disassemble the Display PCB. See disassembling instructions in the next pages.

Setting up and programming the Digital Temperature Meter involves four basic steps:

1. Jumper Configuration (Page 19)

a. Input selection and lockout jumpers b. Relay acknowledge enable c. Fail-safe operation of relays

2. Power Selection (Page 20)

a. Changing to 230 VAC power if needed. 115 VAC is factory default on

AC powered models.

b. Labeling meter for power input: 115 VAC or 230 VAC (24 VDC powered

models are labeled as such at the factory).

3. Connections (Page 21)

a. Power connections b. Signal connections c. Enter, acknowledgement, and hold reading d. Relays connections e. 4-20 mA output connections

4. Programming (Page 29)

a. Basic meter b. Alarm setup and set points c. 4-20 mA output d. Lockout jumper

Programmed Parameter Settings

To simplify programming, write down the desired programming values prior to attempting to program the meter. The Programmed Parameter Settings form, located on page 69, provides a convenient method to record the user settings; it also provides the factory setting for most of the programmable parameters.

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Large Display Temperature Meters Instruction Manual

Disassembling the Meter

To perform the steps described above, it is necessary to partially disassemble the meter. Main PCB may remain attached to enclosure’s base even during conduit hub installation if proper precautions are taken.

Disassembling the PD755

1. Loosen the four screws that hold enclosure’s cover and remove the cover.

2. Remove the four mounting screws holding the Display PCB (see Figure 28,

page 60).

3. Move Display PCB out of the way. Ribbon cable to Display PCB may be

removed during meter installation. Do not remove standoffs from Main PCB. Main PCB is secured to enclosure’s base with four mounting screws.

4. Change voltage selection as required; this is described on page 20. Set

configuration jumpers; connect power and signal wires.

5. Reassemble Display PCB prior to applying power.

6. Program meter prior to installing enclosure’s cover.

7. Install lockout jumper to prevent accidental changes to programmed settings.

Disassembling the PD756

When servicing the PD756 in a hazardous area, all appropriate hazardous area procedures must be followed.

1. Remove enclosure’s cover.

2. Loosen the two mounting screws on the right side of the Display PCB (see

Figure 29 on page 60). It is not necessary to remove the faceplate.

3. Remove the two mounting screws on the left side of the Display PCB.

4. Slide the Display PCB out from under the screws. Ribbon cable to Display

PCB may be removed during meter installation. Do not remove standoffs from Main PCB. Main PCB is secured to enclosure’s base with four mounting screws.

5. Change voltage selection as required, described on page 20. Set

configuration jumpers; connect power and signal wires.

6. Reassemble the Display PCB prior to applying power.

7. To program meter using front panel buttons leave cover off until meter

programming is complete.

8. Install lockout jumper to prevent accidental changes to programmed settings.

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Large Display Temperature Meters Instruction Manual

Disassembling the PD757

1. Loosen the four screws that hold the enclosure’s cover in place and remove

cover.

2. Loosen the top three mounting screws holding the Display PCB (see Figure

30, page 61).

3. Remove the bottom three mounting screws.

4. Slide Display PCB out from under the top three screws. Ribbon cable to

Display PCB may be removed during meter installation. Do not remove standoffs from Main PCB. Main PCB is secured to enclosure’s base with four mounting screws.

5. Change voltage selection as required, described on page 20. Set

configuration jumpers; connect power and signal wires.

6. Reassemble Display PCB prior to applying power.

7. To program meter using front panel buttons leave top cover off until meter

programming is complete.

8. Install lockout jumper to prevent accidental changes to programmed settings.

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Large Display Temperature Meters Instruction Manual

Reassembling the Meter

After the wiring and jumper selections have been made, reassemble the Display PCB.

Reassembling the PD755

1. Place the Display PCB on top of the four standoffs. Make sure the ribbon

cable is connected to the connector on the Display PCB.

2. Replace the four mounting screws (see Figure 28 on page 60).

3. Install enclosure’s cover matching enclosure base and cover tabs.

4. Fasten the four screws that hold the enclosure cover in place.

Reassembling the PD756

1. Slide the Display PCB under the two screws on the right side of the Display.

PCB (see Figure 29 on page 60).

2. Replace the two mounting screws on the left side of the Display PCB.

3. Tighten the two mounting screws on the right side of the Display PCB

4. To program the meter using the front panel buttons leave cover off until

meter programming is complete.

5. Replace the enclosure cover.

Reassembling the PD757

1. Slide the Display PCB under the top three screws (see Figure 30, page 61).

2. Replace the bottom three mounting screws.

3. Tighten the top three mounting screws.

4. Align the enclosure cover so the alarm numbers on the cover are on the left

side of the meter and aligned with the alarm status LEDs.

5. To program the meter using the front panel buttons leave top cover off until

meter programming is complete.

6. Replace the enclosure cover and tighten the four screws that hold it in place.

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Large Display Temperature Meters Instruction Manual

Jumper Configuration

Before programming the Digital Temperature Meter, it is necessary to configure three jumper arrays. The jumper arrays are used for setting type of input signal (thermocouple or RTD), lockout programmed settings, enable relay acknowledgement (ACK), and setting relay fail-safe operation.

Input Selection and Lockout Jumpers (Main PCB)

Figure 31 on page 61 for PD755 Figure 32 on page 62 for PD756 Figure 33 on page 62 for PD757

Jumper JP1 Position Function

RTD RTD Input TC Thermocouple Input

Jumper JP2 Position Function

LOCK Sets a lock on programming

functions

Relay Acknowledge Enable (Display PCB)

Figure 34 on page 63 for PD755 Figure 35 on page 63 for PD756 Figure 36 on page 64 for PD757

Jumper

JP5 Position

Function

1 Enable relay 1 manual reset 2 Enable relay 2 manual reset 3 Enable relay 3 manual reset 4 Enable relay 4 manual reset

Fail-Safe Operation of Relays (Options PCB)

Figure 24 on page 57 for PD755 Figure 25 on page 58 for PD756 Figure 27 on page 59 for PD757

Jumper

J5 Position

Function

On Apply fail-safe function to all relays Off Disable fail-safe function to all relays

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Large Display Temperature Meters Instruction Manual

Power Selection

Overview

Power Selection involves the following:

1. Changing to 230 VAC power if needed. 115 VAC is factory default on AC

powered models.

2. Labeling the meter as to how it will be powered: 115 VAC or 230 VAC.

Meters powered from 24 VDC are labeled as such at the factory.

Note:

Meters ordered to operate from 24 VDC do not require any special setup; this option is not field selectable.

Installation and configuration must be undertaken by qualified servicing personnel.

When servicing the PD756 in a hazardous area, all appropriate hazardous area procedures must be followed.

All AC powered meters are shipped from the factory set for 115 VAC power. Do not apply 230 VAC without first setting up the Digital Temperature Meter to accept this voltage. Otherwise it will cause damage to the meter and endanger personnel.

Disconnect power prior to performing the following procedures. All three meters are field selectable for either 115 VAC or 230 VAC

power. Changing the voltage selection involves the removal of the front cover and the Display PCB, then selecting 115V or 230V on switch S1 located on the Main PCB.

Observe polarity for DC powered meters. Applying voltage with reverse polarity may damage the meter.

Do not apply an AC voltage to DC powered meters. Applying an AC voltage to DC powered meters will result in damage to the meter and endanger personnel.

Changing from 115 to 230 VAC Power

To access the 115/230 VAC switch it is necessary to remove the housing cover and the Display PCB, see Disassembling the Meter, page 16.

Once the Display PCB has been removed, switch S1 is visible

. It is the large

black component with a red slide switch on the top, located next to the transformer. For an illustration see:

Figure 31 on page 61 for PD755 Figure 32 on page 62 for PD756

Figure 33 on page 62 for PD757 For 115 VAC operation, the switch shows 115V; for 230 VAC it shows 230V. Several setup steps are required and connections made while Display PCB is

removed, so it should not be reinstalled just yet. However, to avoid electric shock, install Display PCB prior to applying power.

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Large Display Temperature Meters Instruction Manual

Labeling Meter for 115 VAC, 230 VAC or 24 VDC

Figure 1. Input Power Label

Connections

Overview

The following connections are made to removable screw terminal connectors supplied with each meter:

Power Connections Signal Connections Enter, Acknowledgement, and Hold Connections Relays Connections 4-20 mA Output Connections

Connector Location Function Wire Size

J1 Main PCB Signal connections 12-22 J2 Main PCB Power connections 12-18 J3 Main PCB Connections to Options PCB J4 Main PCB Connections to Display PCB

J1 Options PCB 4-20 mA output 12-22 J2 Options PCB Connections to Main PCB J3 Options PCB Relays 1 & 2 connections 12-18 J4 Options PCB Relays 3 & 4 connections 12-18

label on top of the unit contains a place for the user to indicate if the unit is powered from 115 or 230 VAC. User should mark the appropriate box once the desired power has been selected on switch S1.

CAUTION

ALL AC POWERED UNITS ARE SHIPPED FROM THE FACTORY SET FOR 115 VAC

115 VAC

230 VAC

24 VDC

(SEE INSTRUCTION MANUAL TO CHANGE VOLTAGE SELECTION)

Page 22

Large Display Temperature Meters Instruction Manual

Wiring Instructions

For connector locations, refer to:

Figure 31 on page 61 for PD755 Figure 32 on page 62 for PD756 Figure 33 on page 62 for PD757

1. All field connections to be made with insulated copper wire, either solid or stranded. Tighten all screw terminals to 4.5 lb-in (0.5 Nm). Strip length = ¼ in (7 mm). DO NOT

pre-treat wire with solder.

2. Terminals L1(V+), L2(V-) on J2, Main PCB, Earth Ground, and terminals 1-6 on J3-J4, Options PCB: Use AWG #12-18 wire, 600 volt, 60°C. Connect only one wire to each terminal.

3. Terminals EN, AK, H, CM, P-, P+, EX, +, –, on J1 Main PCB and terminals +, - on Options PCB: Use AWG #12-22 wire, 150 volt, 60°C. If using AWG #20 or smaller wire, up to two wires may be connected to each terminal. If using AWG #18 or larger wire, only one wire may be connected to each terminal.

4. Install conduit hubs to the enclosure cable input ports. To maintain NEMA 4X rating use only UL/CSA watertight conduit hubs.

5. Feed all wires through the enclosure cable input ports.

6. Remove one connector at a time from the headers and connect the wires to the connector.

7. After wiring a connector, insert it back into the header.

Terminals Designation

Terminal Description Terminal Description

L1, L2, Gnd AC input power

P+, P- 24 VDC supply

V+, V- DC input power

EX Excitation for RTD

EN External Enter +, -

(Main PCB)

TC & RTD input

AK External relay

acknowledge

+, -

(Options PCB)

4-20 mA output (see page 27)

H Hold reading 1-6

(Option PCB)

Relays 1-4 (see page 27)

CM Common (return) for

AK, EN, & H

Page 23

Large Display Temperature Meters Instruction Manual

Power Connections

When servicing the PD756 in a hazardous area, all appropriate hazardous area procedures must be followed.

Refer to Changing from 115 to 230 VAC Power, page 20 to make sure meter is set up to accept proper voltage before applying power.

Disconnect power to the meter before making any connections.

Do not connect Power or Earth Ground to any unused or CM terminals.

Connecting 230 VAC with 115 VAC selected will result in damage to the instrument as well as endanger personnel. Connecting AC power when meter is set up for DC power will result in damage to the instrument as well as endanger personnel.

Connect power to terminals L2(V-) and L1(V+) on screw terminal connector J2, located near the transformer on the Main PCB. Connect Earth Ground to screw terminal marked with Ground symbol located on enclosure’s base for PD756 and

757. Ground terminal for PD755 is located on J2 connector. Figure 31 on page 61 for PD755

Figure 32 on page 62 for PD756 Figure 33 on page 62 for PD757

Figure 2. Input Power Connections for 756 and 757

Notice:

• Primary voltages must not be accessible to the user.

• Primary wires must be installed in accordance to the applicable standards.

• Keep the primary wires separated from signal cables.

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Large Display Temperature Meters Instruction Manual

Signal Connections

Signal connections are made to a 10 position connector J1 on the Main PCB. This connector also includes connections for Enter, Acknowledgement, Hold Reading, and Common. For location of J1, refer to:

Figure 31 on page 61 for PD755. Figure 32 on page 62 for PD756. Figure 33 on page 62 for PD757.

Figure 3. Four-Wire RTD Connections

Figure 4. Three-Wire RTD Connections

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Large Display Temperature Meters Instruction Manual

Figure 5. Two-Wire RTD Connections

Figure 6. Thermocouple Connections

Page 26

Large Display Temperature Meters Instruction Manual

Enter, Acknowledgement, and Hold Connections

Enter, acknowledgement, and hold terminals on J1 (Main PCB) provide a convenient method to remotely access the following functions:

Terminal Function

EN Programs meter via the front panel menu AK Acknowledges or resets relays, exit menu scroll H Holds the temperature reading

Hold reading switch

ACK switch

ENTER switch

Figure 7. External Control Connections

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Large Display Temperature Meters Instruction Manual

Optional Relays & 4-20 mA Output Terminals

Depending on model number, Options PCB may contain 2 or 4 relays and/or an isolated 4-20 mA output transmitter. Relay connections are made to removable screw terminal connectors located at J3 and J4 on the Option PCB. Connections for the isolated 4-20 mA output option are made to J1 on the Options PCB. For location of connectors, refer to:

Figure 24 on page 57 for PD755. Figure 25 on page 58 for PD756. Figure 27 on page 59 for PD757.

PD375 PD475

PD376 PD476

PD374 PD474

PD377 PD477

PD378 PD478

Figure 8. Relay and 4-20 mA Output Terminals

Page 28

Large Display Temperature Meters Instruction Manual

Isolated 4-20 mA Output Transmitter Connections

The Digital Temperature Meter can be equipped with an optional isolated 4-20 mA output transmitter that can be programmed to produce a 4-20 mA signal for virtually any temperature span displayed. For best performance, a 500 count span is recommended between the 4 and 20 mA outputs. (Ex. 0.0°C = 4 mA,

50.0°C = 20 mA).

The following diagrams illustrate the 4-20 mA output signal being powered from the Digital Temperature Meter’s internal power supply (AC powered meters only) and by an external power supply.

Figure 9. Output Loop Powered by Meter

Figure 10. Output Loop Powered from External Power Supply

If the output loop is powered by an external supply, the loop power supply must be turned on before the meter is turned on. Otherwise, the output loop signal may be incorrect.

Page 29

Large Display Temperature Meters Instruction Manual

Programming

Overview

This section of the manual deals with programming the following aspects of the meter:

Basic Meter Alarm Set Points 4-20 mA Output Lockout Jumper

The Digital Temperature Meter is programmed after setting three jumper arrays, see Jumper Configuration on page 19. The ENTER button is used to program all the meter functions and to display useful information.

The jumper arrays are used for setting the input (thermocouple or RTD), lockout, relay acknowledge enable (ACK), and relay fail-safe operation.

Jumper Arrays

Jumper Array Function Label Location

Input signal T/C or RTD JP1 Main PCB

Lockout JP2 Main PCB

Relay ACK enable JP5 Display PCB

Fail-safe J5 Options PCB

For jumper array location see:

Figure 31 and Figure 34 on pages 61, 63 for PD755. Figure 32 and Figure 35 on pages 62, 63 for PD756. Figure 33 and Figure 36 on pages 62, 64 for PD757.

If the optional relay PCB is installed, it is best to program the fail-safe jumper (J5 on Options PCB) for the desired operation before reassembling the Display PCB because this jumper is not accessible once the Display PCB is installed.

Select Type of Input Signal T/C or RTD

The Digital Temperature Meter can accept either thermocouples or RTD inputs, using jumper JP1 located on the Main PCB.

Figure 11. JP1 Input Signal Selection Array.

The Digital Temperature Meter can be programmed to restrict personnel from making changes to the programmed parameter settings; this is accomplished by installing a jumper over LOCK pins on JP2.

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Large Display Temperature Meters Instruction Manual

ENTER Button Functionality

The ENTER button is used to program the meter for various functions, is located on the Display PCB and is labeled SW2. The ENTER button on PD755 can be accessed from the front panel. The ENTER button on models 756 and 757 can only be accessed with the front panel removed. The ENTER button can also be accessed by wiring a normally open pushbutton switch across terminals EN and CM on connector J1 located on the Main PCB (see Figure 7 on page 26).

ACK Button Functionality

The ACK button is used to acknowledge the relays when the meter is in reading mode and to quit the menu scroll in programming or diagnostic. If ENTER has been pressed and the meter is scrolling down the menu, pressing ACK button returns meter to reading mode, it does not acknowledge relays during menu scroll.

Magnetic Reed Switch Functionality

The PD756 has two magnetic reed switches located above the ENTER and ACK buttons. The reed switches allow the user to program and operate the meter without having to remove the enclosure cover.

To operate the reed switches, move the magnet assembly (PDA-MAG) toward and away from the glass window, just above the ENTER and ACK buttons. The action is detected when the magnet is moved away from the glass window. Moving the magnet toward and away from the glass window produces the same results as pressing the front panel buttons.

The PD756 can be programmed and operated in three different ways:

1. Using front panel push buttons.

2. Using external push buttons wired to J1 connector. Explosion-proof control stations are required when used in a hazardous area.

3. Using magnet assembly to operate the reed switches.

PDA-MAG (Optional)

Move magnet toward and away from cover to operate ENTER and ACK buttons

Magnet

Handle

Figure 12. Reed Switch Operation

Page 31

Large Display Temperature Meters Instruction Manual

General Programming Description

When power is applied to the meter, the display flashes 188888, then it displays the temperature from the sensor.

To program the meter lockout jumper JP2 must be removed. After pressing the ENTER button, the display will scroll through the following

functions in the order shown:

Display Type of Function

HI t

Displays maximum temperature

LO t

Displays minimum temperature

CALIb

Calibrates meter for selected input type.

OFFSEt

Sets offset value to the input, negative or positive

type

Sets the type of T/C or RTD to be used

F or C

Sets temperature scale, Fahrenheit or Celsius

SetuP

Sets alarm set points for latching or non-latching operation

SetPtS

Sets alarm set and reset points.

output

Sets 4 and 20 mA output points, if this option is installed.

dIA9

Displays parameter settings one at a time for diagnostic purposes.

Five Basic Digit/Display-Setting Instructions

1. If flashing display is OK, press ENTER to accept it, before display stops flashing.

2. If flashing display is not OK, (or if ENTER was not pressed in time to accept it), wait for the first digit to flash.

3. If a flashing digit is OK, press ENTER to accept it, before it starts to scroll.

4. If a flashing digit is not OK, (or if ENTER was not pressed in time to accept it) wait for digit to scroll, and press ENTER when OK.

5. Digits will scroll until ENTER is pressed. When a digit is accepted by pressing ENTER, next digit flashes.

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Large Display Temperature Meters Instruction Manual

Programming the Basic Meter

Programming the basic meter consists of selecting the type of T/C or RTD and selecting the temperature scale °F or °C.

The Digital Temperature Meter must be programmed for the type of thermocouple or RTD it is to accept. Selecting the wrong type will cause an incorrect temperature to be displayed.

Connect the thermocouple or RTD to J1 on the Main PCB. Using the TYPE menu, enter a number from 0 to 10, this number defines the type

of thermocouple or RTD input required and the display resolution. The following table is used to define the types:

Type

Number

Type of Input Range Accuracy

0 Type J T/C

–328° to 1382° F –200° to 750°C

±2°F ±1°C

1 Type K T/C

–328° to 2498°F –200° to 1330°C

±2°F ±1°C

2 Type T T/C

–330° to 760°F –200° to 404°C

±2°F ±1°C

3 Type T T/C

(0.1°)

–330.0° to 760.0°F –200.0° to 404.0°C

±2°F ±1°C

4 Type E T/C

–328° to 1832°F –200° to 1000°C

±2°F ±1°C

5 Type R T/C

32° to 3213°F 0° to 1767°C

±5°F ±3°C

6 Type S T/C

40° to 3214°F 4° to 1768°C

±6°F ±3°C

100 Ω RTD (0.00385, 0.1°)

–328.0° to 1382.0°F –200.0° to 750.0°C

±0.7°F ±0.4°C

100 Ω RTD (0.00392, 0.1°)

–328.0° to 1382.0°F –200.0° to 750.0°C

±0.7°F ±0.4°C

100 Ω RTD (0.00385, 1°)

–328° to 1382°F –200° to 750°C

±1°F ±1°C

100 Ω RTD (0.00392, 1°)

–328 to 1382°F –200° to 750°C

±1°F ±1°C

Page 33

Large Display Temperature Meters Instruction Manual

Selecting Type of T/C or RTD (TYPE)

After power is applied to the meter, the display will indicate a temperature reading which might be incorrect since the meter could be programmed for a different type of thermocouple or RTD.

Press ENTER to begin scrolling through the functions.

62f

When type (type) appears, press ENTER.

type

The meter now displays the type choices starting at the previously programmed number; here it is type 6. The number starts to increase up to type 10 and then goes to type 0. Select the type number from the previous table.

Type 6

Press ENTER when the desired type number appears. In this case, it is type 0 for type J T/C.

Type 0

The meter will then display F or C Press ENTER to select scale.

F or C

Press the ACK button to quit menu scroll and return to indication mode. The meter is now displaying the process temperature accurately.

72f

Select °F or °C (f or C)

The Digital Temperature Meter will display temperature in either Fahrenheit or Celsius scale.

Set or change the temperature scale

Press ENTER to begin scrolling through the functions.

72f

When f or C (°F or °C) appears, press ENTER.

F or C

The display will show F for Fahrenheit and C for Celsius; they will flash alternately. Select one when it is flashing by pressing ENTER.

F or C

The display will indicate the temperature in the selected scale.

22{

Note: Whenever a programmed setting is changed in the basic meter, the offset value is reset to zero and the max/min readings are reset to the actual temperature reading. Alarm setup, set points, and 4-20 mA output programming do not reset these settings.

Page 34

Large Display Temperature Meters Instruction Manual

Alarm Setup and Set Points Programming

Overview

The Digital Temperature Meter is available with four alarm points and corresponding front panel status LEDs as a standard feature. The front panel LEDs are useful for alarm applications that require visual notification only. For applications that require relay contacts, such as driving external alarm devices or on/off temperature control, the Digital Temperature Meter can be equipped with either two or four relays. Any of these relays may be assigned to set and reset at predetermined temperatures. Each relay can be set up for latching or nonlatching operation independently.

Programming the relays involves four steps:

1. Setting the relay manual reset (ACK enable) jumpers. These jumpers (JP5) are located on the Display PCB and determine if a

relay can be manually reset.

2. Setting the fail-safe jumper (J5). Fail-safe mode (default): In the alarm condition, the NC contacts are

connected to the Common (C) contacts of the relays. The fail-safe operation can be disabled, by removing jumper J5 located on the Options PCB.

3. Setting the alarm set points for latching or non-latching relay operation using

SETuP menu.

4. Setting set and reset points using

SEtPtS menu.

a. Setting set points for alarms. b. Setting reset points for alarms.

Set Relays for Manual or Automatic Reset

Jumper array JP5 located on the Display PCB is used to program the relays so they can be reset manually. For location of JP5 on the Display PCB, see:

Figure 34 on page 63 for PD755. Figure 35 on page 63 for PD756. Figure 36 on page 64 for PD757.

Set Relays for Fail-Safe Operation

In fail-safe mode, the relay coils are energized and the Normally Open (NO) contacts are connected to the Common (C) contacts under normal operation. During an alarm condition, the relay coils are de-energized, the Normally Closed (NC) contacts are connected to the Common (C) contacts. During power failure, the relay contacts reflect an alarm condition.

Removing jumper J5 disables the fail-safe operation. J5 is located on the Options PCB next to the J2 connector. For location of J5 on the Options PCB, see:

Figure 24 on page 57 for PD755 Figure 25 on page 58 for PD756 Figure 27 on page 59 for PD757

If fail-safe mode is disabled, operation of the relay contacts is opposite to the one described in the previous paragraph.

Page 35

Large Display Temperature Meters Instruction Manual

Setup for Latching or Non-Latching Relays (SetuP)

Each alarm set point can be set up for latching or non-latching relay operation independently. This means that a combination of latching and non-latching relays could be used in this meter. Factory default is nonlatching operation for all relays.

Note To simplify programming, write down the desired programming

values prior to attempting to program the meter. The Programmed Parameter Settings form, located on page 69, provides a convenient method to record the user settings; it also provides the factory setting for most of the programmable parameters.

Press ENTER to begin scrolling through the functions.

72f

When setup ( SEtuP) appears, press ENTER.

setup

The display scrolls through set 1, Set 2, set

, and set 4 for set point 1 through set point 4

setup. Press ENTER to select latching or nonlatching relay operation for desired set point. If ENTER is pressed while scrolling set points,

LatCH is displayed for 3 seconds.

set 1

then

set 2

then

set 3

then

set 4

Press ENTER to program set point for latching or non-latching relay operation when LatCH is displayed.

LAtCH

Y or n flashes alternately. Press ENTER when

appropriate letter is flashing to make selection. After selection is made, display shows next set point or next menu function.

Y or n

then

SEtPts

Press ACK button to exit menu scroll and return to reading mode or wait until meter scrolls through the entire menu. The display will return to indicate the temperature.

72F

Page 36

Large Display Temperature Meters Instruction Manual

Alarm Set and Reset Points Programming

Alarm set and reset point values are programmed under the set points (SEtPtS) menu, one at a time, starting with alarm #1 set point.

The four discrete LEDs on the display indicate which alarm point is being programmed. There are two LEDs on the display PCB labeled S and R, they indicate whether a set or reset point is being programmed

Each alarm will have a set point programmed first, and then the reset point is programmed.

Each alarm set point may be programmed for either a high alarm or a low alarm with 0-100% deadband.

To program a high alarm:

Program the set point above the reset point.

To program a low alarm:

Program the set point below the reset point.

To program the alarm deadband:

Program the reset point above or below the set point by an amount equal to the desired deadband value.

Example:

Alarm 2 is a high alarm that trips at 1500° and has a deadband of 100°.

Alarm 2 set point is set at 1500° and its reset point at 1400°.

Page 37

Large Display Temperature Meters Instruction Manual

Programming Alarm Points Using Set Points (setpts) Menu

Note To simplify programming, write down the desired programming values

prior to attempting to program the meter. The Programmed Parameter Settings form, located on page 69, provides a convenient

method to record the user settings; it also provides the factory setting for most of the programmable parameters.

Press ENTER, then press ENTER again when set points (SEtPtS) function appears. The display will scroll through the set points. Press ENTER when the desired set point is displayed to program that set point.

SEtPtS

To program set points values

The display scrolls through

set 1, Set 2, set 3, set 4,

for alarm set point 1 through alarm set point 4. Press ENTER when desired set point appears.

After

Set 4 is displayed or programmed, the meter will exit

the

SetptS (set points) menu and move to the next

programming menu.

output will be displayed, if 4-20 mA transmitter output

option is installed.

SEt 1

then

SEt 2

then

SEt 3

then

SEt 4

then

outPut

If ENTER is pressed while a set point is shown, the display will then show a flashing number. Program the desired set point value per

Five Basic Digit/Display-Setting Instructions on page 31.

SEt 1

then

00100F

Alarm Set and Reset Programming Confirmation

To verify that the alarm set and reset points have been programmed as desired, press ENTER, and press ENTER again when sEtPtS appears, the display will scroll through set points 1 through 4. Press ENTER when the desired set point is shown. Before the display stops flashing set point value, press enter to advance the display to reset point.

Page 38

Large Display Temperature Meters Instruction Manual

Isolated 4-20 mA Output Transmitter Option

50.0°C = 20 mA).

Figure 9 and Figure 10 on page 28 show the 4-20 mA output signal being powered from the Digital Temperature Meter’s internal 24V power supply (AC powered meters only) and by an external power supply.

To program the 4-20 mA output, a temperature display is programmed to produce the 4 mA signal. Another temperature display, (higher or lower than the one set for the 4 mA point), is programmed to produce the 20 mA signal. The output will be linear as the temperature changes from the 4 mA setting to the 20 mA setting.

Example: If the 4 mA point is set for 0°, and the 20 mA point is set for 1000°, the

output will be 6 mA when the temperature display reads 125°.

Note: The 4-20 mA output is driven by the number been displayed. It doesn’t

adjust itself if the temperature scale is changed.

4-20 mA Output Programming (output)

Press ENTER, then press ENTER again when the output (output) menu appears.

output

Set the display for the value at which 4 mA is produced

The green LED labeled “4” will be on indicating the meter is ready to accept the value at which 4 mA is produced. After the display corresponding to 4 mA is accepted, an LED labeled “20” turns on. For instructions, see

Five Basic Digit/Display-Setting Instructions on page 31.

00032f

final

00000f

Set the display for value at which 20 mA is produced The green LED labeled “20” will now be on indicating the

meter is ready to accept the value at which 20 mA is produced. Program this value in the same fashion as was done above.

00100f

final

01000f

4-20 mA Output Programming Confirmation

The values that have been programmed to produce the 4 and 20 mA outputs can be quickly checked to make sure they are the desired values. To do this, access the

outPut routine by pressing ENTER, and then pressing ENTER again when

outPut appears.

The green “4” LED illuminates indicating the meter is displaying the value at which it will produce a 4 mA output. Confirm that this is the desired value. Press ENTER, the green “20” LED illuminates indicating the meter is displaying the value at which it will produce a 20 mA output. Confirm that this is the desired value. Press ENTER (within 3 seconds) before the entire display stops flashing and the meter returns to indication mode.

Page 39

Large Display Temperature Meters Instruction Manual

Input Offset Adjustment (OFFSEt)

This parameter allows the user to select an offset to the input signal being displayed. Offset values can be either positive or negative and can be any number within the range of the display. The offset value is programmed through the offset (

OFFSEt) menu.

The offset feature can be useful to compensate for errors due to thermocouple junctions or excessive lead wire resistance in RTDs.

The offset value is factory default to zero. The offset value is automatically reset to zero whenever a programmed parameter, related to the temperature display, is changed.

To program the offset value follow instructions described in, Five Basic Digit/Display-Setting Instructions on page 31.

Program input offset

Press ENTER, when OFFSEt appears press ENTER again to program input offset value.

Example: If display reads 85°F when the actual temperature

is 80°F, program an offset value equal to -5°F. Then the display will indicate the actual temperature.

85F

then

OFFSEt

then

00000F

then

-0005F

then

80F

Lockout Jumper

The Lockout jumper is used to restrict modification of calibration and programming values. It is labeled “LOCK” on JP1 (see Figure 11 on page 29).

The lockout feature allows viewing only of the alarm settings and temperature points programmed to produce the 4 and 20 mA output signals.

The following menu functions are still available with the lockout jumper installed.

Display Type of Function

HI t

Displays maximum temperature.

LO t

Displays minimum temperature.

CLEAr

Clears (resets) maximum or minimum temperatures reached by the process.

SEtPtS

Displays alarm set and reset points.

output

Displays 4 and 20 mA output points, if this option is installed.

dIA9

Displays parameter settings one at a time for diagnostic purposes. Press ACK to exit diagnostic menu at any time.

Page 40

Large Display Temperature Meters Instruction Manual

OPERATION

Overview

The Large Display Temperature Meter accepts the J, K, T, E, R, and S thermocouples and 100 Ω platinum RTDs as inputs. The meter will display the temperature in either Fahrenheit or Celsius scales on a 4½ digit display. Options include up to four relays for external switching at alarm points as well as an isolated 4-20 mA transmitter output.

The front panel consists of six seven-segment LEDs as well as eight programming/operational LEDs. The programming/operational LEDs provide the following indication:

LED During Programming During Operation

1 Alarm 1 Alarm 1 2 Alarm 2 Alarm 2 3 Alarm 3 Alarm 3 4 Alarm 4 Alarm 4

S Set point indicator None

R Reset point indicator None

4 4 mA output indicator None

20 20 mA output indicator None

Refer to Figure 37 on page 65 for PD755. Refer to Figure 38 on page 65 for PD756. Refer to Figure 39 on page 65 for PD757.

The four alarm status LEDs indicate alarm condition only and do not represent relay status when set points are set up for non-latching relay mode. For instance, if alarm 1 is programmed for a high alarm at 500 with manual reset of the relays. If the operator resets the relays when the display reads 650, LED #1 will stay on until the display falls below 500.

Set points set up for latching relay mode will reflect the status of the LEDs, regardless of the status of the alarm condition. For instance, when a latching relay is acknowledged the corresponding status LED will extinguish.

Another example:

• With manual reset of the relays enabled.

• Alarm 1 set up as non-latching and programmed for high alarm.

Set at 100 Reset at 50

• If the operator resets the relays when the display reads 80.

• LED 1 will stay on until the display falls below 50.

Page 41

Large Display Temperature Meters Instruction Manual

Basic Meter Operation

Overview

In its most basic form, the Digital Temperature Meter provides process temperature display with visual alarm indication. It captures the maximum and minimum process temperature and displays it through the

HI t and LO t menu

functions. The maximum and minimum captured temperatures can be reset, after they are displayed, through the

CLEAr menu function.

The diagnostic feature (

dIA9) provides an easy way to view and write down the

parameter settings for troubleshooting purposes. Press ENTER to step through the functions and settings, press ACK to exit at any time.

Maximum/Minimum Temperature Display

The maximum and minimum temperatures reached by the process are store in memory until cleared (reset) by the user or until power is turned off to the meter. Max/min temperatures are displayed via the ENTER button and

HI t/ LO t

menu functions respectively. Max/min values are reset whenever a programmed setting, relative to temperature display, is changed.

Display maximum and minimum temperatures

Maximum temperature

Press ENTER, the first function displayed is

HI t, press ENTER again to display the

maximum temperature reached by the process since last reset. Maximum temperature will be displayed for 3 seconds, then display will show flashing

CLEAr.

500F

then

HI t

then

725F

Reset maximum temperature

After maximum temperature is displayed, CLEAr function appears. Press ENTER to reset maximum temperature in memory or press ACK to exit without resetting value in memory.

CLEAr

Minimum temperature

Press ENTER when

LO t is displayed to display

minimum temperature reached by the process since last reset. Minimum temperature will be displayed for 3 seconds, then display will show flashing

CLEAr.

500F

then

LO t

then

475F

Reset minimum temperature

After minimum temperature is displayed, CLEAr function appears. Press ENTER to reset maximum temperature in memory or press ACK to exit without resetting value in memory.

CLEAr

• Pressing ENTER while Max/min values are being displayed advances display to

CLEAr.

• Pressing ACK at any time in the above-described operations exits to reading

mode.

Page 42

Large Display Temperature Meters Instruction Manual

Relays Operation

Overview

The relay option added to the Digital Temperature Meter expands its usefulness beyond simple indication to provide users with alarms and simple on/off temperature controlling functions. There are two basic ways the relays can be used:

1. High or low alarms with latching or non-latching relay operation.

2. Simple on/off temperature control with 100% adjustable deadband.

Relays Auto Initialization

When power is applied to the meter, the front panel LEDs and alarm relays will reflect the state of the input to the meter. For instance, if the meter is powered up and reads 500, the following table indicates how the alarm LEDs and relays will react based on the various set and reset points:

Alarm # HI or LO

Set

Point

Reset

Point

Power-Up

Reading

Relay &

LED

1 HI 1000 500 499 Off 2 LO 700 900 500 On 3 LO 250 400 500 Off 4 HI 450 200 500 On

Fail-Safe Operation

The following table indicates how the relays behave based on Jumper J5 being installed or not installed:

Jumper J5 on Options PCB

Fail-Safe Relay coils

Energized in

Power Failure

On Enabled Non-alarm state Relays go to

alarm state

Off Disabled Alarm state Relays go to

non-alarm state

Page 43

Large Display Temperature Meters Instruction Manual

Front Panel LEDs

Refer to Figure 37 on page 65 for PD755. Refer to Figure 38 on page 65 for PD756. Refer to Figure 39 on page 65 for PD757.

The LEDs on the front panel provide status for the following:

LED Status LED Status

1 Alarm 1 S Set point indicator 2 Alarm 2 R

Reset point indicator 3 Alarm 3 4 4 mA indicator 4 Alarm 4 20 20 mA indicator

The Digital Temperature Meter is supplied with four alarm points that include front panel LEDs to indicate alarm conditions. This standard feature is particularly useful for alarm applications that require visual-only indication. The front panel LEDs are controlled by the set and reset points programmed by the user and the acknowledge function in latching relay operation. When the display passes a set point for a particular alarm, that alarm’s LED will light up. When the meter passes back through that alarm’s reset point the LED will go off if alarm point was set up for non-latching operation.

Alarm status LEDs respond differently for latching and non-latching relays. For non-latching relays, LEDs are always off during normal condition and always

on during alarm condition, regardless of state of the relay. For latching relays, LEDs reflect state of the relays, regardless of the alarm

condition. The following tables illustrate how the alarm LEDs function in relation to the relays and the acknowledge button:

Relay key legend for following tables

Key Relay condition

On Tripped Off Reset

Ack Acknowledged

The On and Off keys do not refer to the status of the relay’s coil, which depends on the fail-safe mode selected.

Non-Latching Relay

Automatic reset only JP5(1-4 off)

Condition LED Relay

Normal Off Off Alarm On On Ack (No effect) On On Normal Off Off

In this application, the meter is set up for automatic reset and non-latching relay. Acknowledging the alarm while it is present has no effect on either the LED or the relay. When the alarm finally goes away, the relay automatically resets and the LED goes off.

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Large Display Temperature Meters Instruction Manual

Non-Latching Relay

Automatic + manual reset at any time JP5(1-4 on)

Condition LED Relay

Normal Off Off Alarm On On Normal Off Off

In this application, the meter is set up for automatic + manual reset at any time and non-latching relay. The LED and the relay automatically reset when the meter returned to the normal condition.

Automatic + manual reset at any time JP5(1-4 on)

Condition LED Relay

Normal Off Off Alarm On On Ack On Off Normal Off Off

In this application, the meter is also set up for automatic + manual reset at any time. However, this time, an operator acknowledges the alarm manually while it still exists. This causes the relay to reset, but the LED stays on until the meter returns to the normal condition. Remember, for non-latching relays, the LED is always OFF during normal condition and always ON during alarm condition, regardless of the state of the relay.

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Large Display Temperature Meters Instruction Manual

Latching Relay

Manual reset only after signal passes reset point JP5(1-4 off)

Condition LED Relay

Normal Off Off Alarm On On Ack (No effect) On On Normal On On Ack Off Off

In this application, the meter is set up for manual reset only after the signal passes the reset point of the latching relay. Acknowledging the alarm while it is present has no effect on either the LED or the relay. When the alarm is acknowledged, after it returns to the normal state, the LED and the relay go off. Notice that the LED remained on; even after the meter returned to the normal condition. This is because, for latching relays, the alarm LEDs reflect the status of the relays, regardless of the alarm condition.

Manual reset only after signal passes reset point JP5(1-4 off)

Condition LED Relay

Normal Off Off Alarm On On Normal On On Ack Off Off

In this application, the meter is set up for manual reset only after the signal passes the reset point of the latching relay. When the alarm is acknowledged, after it returns to the normal state, the LED and the relay go off.

Latching Relay

Manual reset any time JP5(1-4 on)

Condition LED Relay

Normal Off Off Alarm On On Ack Off Off

In this application, the meter is set up for manual reset at any time. Acknowledging the alarm even if the alarm condition is present resets the relay and turns off the LED.

Acknowledging Relays

There are two ways to acknowledge relays programmed for manual reset: via the front panel ACK button and remotely via a switch wired across AK and CM terminals on the Main PCB. When the ACK button or a switch wired across the AK and CM terminals is closed, all relays programmed for manual reset will reset.

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Large Display Temperature Meters Instruction Manual

Switching Inductive Loads

The relay contacts on the Options PCB are already protected with suppression components (snubbers).

If additional suppression is required, this suppression can be obtained with RC networks assembled by the user or purchased as a complete assembly. Refer to the following circuits for RC network assembly and installation:

AC and DC Loads

Figure 13. AC and DC Loads Protection

Choose R and C as follows: R: 0.5 to 1 Ω for each volt across the contacts C: 0.5 to 1 µF for each 1 A through closed contacts

Notes:

1. Use capacitors rated for 240 VAC.

2. Snubbers may affect load release time of solenoid loads, check to confirm proper operation.

3. Install the RC network at the Digital Temperature Meter 's relay screw terminals. An RC network may also be installed across the load, experiment for best results.

Low Voltage DC Loads

Figure 14. Low Voltage DC Loads Protection

Note: Use a diode with a reverse breakdown voltage two to three times the circuit

voltage and forward current at least as large as the load current.

4-20 mA Output Operation

The Digital Temperature Meter can be equipped with an isolated 4-20 mA output option that can be programmed to produce a 4-20 mA signal between any two temperature values.

Page 47

Large Display Temperature Meters Instruction Manual

RECALIBRATION (CALIB)

The Digital Temperature Meter is precalibrated for six types of thermocouples and two types of 100 Ω RTD sensors. These input ranges may be recalibrated and should be checked every 12 months.

Calibration is performed from the front panel using the ENTER button. The lockout jumper JP2 must be removed to gain access to the calibration menu, see Input Selection and Lockout Jumpers (Main PCB), on page 19. The only equipment needed is a thermocouple calibrator or a 5 decade resistance box with an accuracy of about 0.1% and a minimum resistance step of 0.01 Ω for RTD calibration.

Before attempting to calibrate the meter, make sure type selected and input signal wires are correct. Using the wrong type selection or the wrong T/C wire will cause inaccurate temperature readings.

Note To simplify programming, write down the desired programming values

prior to attempting to program the meter. The Programmed Parameter Settings form, located on page 69, provides a convenient

method to record the user settings; it also provides the factory setting for most of the programmable parameters.

Press ENTER, then press it again when calibrate (CalIb) function appears.

CalIb

Input 1 (Inpt 1) will flash. Apply the input corresponding to the low calibration point. Here, in this example calibration points will be 32°F and 1000°F. It is recommended to set the calibration points outside the minimum and maximum expected temperature readings. Press ENTER.

Inpt 1

Set the low calibration

For instructions, see

Five Basic Digit/Display-Setting

Instructions on page 31. After

low calibration point has been programmed, the display will flash

Inpt 2.

00000f

final

00032f

Input 2 (Inpt 2) will flash. Apply the input corresponding to the high calibration point. Press ENTER.

Inpt 2

Set the high calibration point

The procedure used to set the low calibration point is the same for the high calibration point. In this example we will set it for 1000°F. After high calibration point has been programmed, display moves to the next menu function.

1000f

Calibration Error (error)

A meter display of Error during calibration indicates that the calibration process was not successful. The meter should be recalibrated.

The Error message will appear if input 1 signal and input 2 signal are too close together. The Error message will appear if input 1 signal is inadvertently applied for input 2

calibration signal, or ENTER is pressed before applying input 2. In all cases, if an error message appears, previous calibration points will be retained in

memory.

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Large Display Temperature Meters Instruction Manual

Recommended Calibration Points

To calibrate the meter, it is recommended to use the Fahrenheit scale; this will give a greater degree of accuracy to the calibration. The scale can be changed to the Celsius scale after calibration is complete; the meter will display temperature accurately in any scale. The following table shows the recommended low and high calibration points for all types.

Type

Number

Type of input Input 1

(Low)

Input 2

(High)

Check

(Middle)

0 Type J T/C

32°F 1182°F 600°F

1 Type K T/C

32°F 1893°F 960°F

2 Type T T/C

32°F 693°F 360°F

3 Type T T/C

32.0°F 693.0°F 360.0°F

4 Type E T/C

32°F 1652°F 840°F

5 Type R T/C

100°F 3000°F 1500°F

6 Type S T/C

100°F 3000°F 1500°F

100 Ω RTD (0.00385, 0.1°)

32.0°F 100Ω

1148.0°F

320.12Ω

590.0°F

215.61Ω

100 Ω RTD (0.00392, 0.1°)

32.0°F 100Ω

1127.0°F

320.89Ω

580.0°F

215.87Ω

100 Ω RTD (0.00385, 1°)

32°F

100Ω

1148°F

320.12Ω

590°F

215.61Ω

100 Ω RTD (0.00392, 1°)

32°F

100Ω

1127°F

320.89Ω

580°F

215.87Ω

Minimum Input Span

Minimum span between input 1 and input 2 signals is 5 mV; consult a thermocouple table to convert mV to °F or °C for selected T/C type and specific temperature range. For RTD inputs the minimum input span is 10 Ω . Accuracy within the calibrated span will be improved, but outside the calibrated span accuracy will not be reliable.

Calibration Verification

To verify calibration:

• Apply low calibration point signal and note reading.

• Apply high calibration point signal and note reading.

• Apply mid-scale signal and note reading.

Noted readings should be within accuracy specification for selected type. Otherwise, meter should be recalibrated for selected type and required temperature span.

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Large Display Temperature Meters Instruction Manual

INSTALLATION

The overall dimensions for the Digital Temperature Meters are shown in:

Figure 40 on page 66 for PD755. Figure 41 on page 66 for PD756. Figure 42 on page 67 for PD757.

Wall Mounting Instructions

PD755 Mounting

There are four mounting holes on the base of the enclosure. They are used to mount the instrument to a wall. The dimensions for the mounting holes are shown in Figure 43 on page 67.

Procedure:

1. Drill holes into the wall to accommodate suitable fasteners.

2. Remove the front bezel from the housing by removing the four mounting screws.

3. Align the enclosure mounting holes with the holes in the wall and insert the fasteners. Tighten the fasteners (see the screw mounting in Figure 44 on page 67).

PD756 Mounting

There are four mounting holes on the base of the enclosure. They are used to mount the instrument to a wall. The dimensions for the mounting holes are shown in Figure 45 on page 68.

Procedure:

1. Drill holes into the wall to accommodate the fasteners.

2. Align the enclosure mounting holes with the holes in the wall and insert the fasteners. Tighten the fasteners.

PD757 Mounting

There are four mounting holes on the rear of the enclosure. They are used to mount the instrument to a wall. The dimensions for the mounting holes are shown in Figure 46 on page 68.

Procedure:

1. Drill holes into the wall to accommodate suitable fasteners.

2. Remove the front bezel from the housing by removing the four mounting screws.

3. Align the enclosure mounting holes with the holes in the wall and insert the fasteners. Tighten the fasteners.

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Large Display Temperature Meters Instruction Manual

Panel Mounting Instructions

For applications where it is required to mount the Digital Temperature Meter into a panel, panel mounting kits are available for PD755 and PD757.

(See Ordering Information on page 7)

PD755 Panel Mounting Instructions

MOUNTING PLATE

PANEL

(4) MTG. BRACKETS

(4) SELF TAPPING

SEE NOTES

(12) WASHERS

PANEL OPENING

Figure 15. PD755 Panel Mounting

Instructions:

1. Insert the meter through the mounting plate.

2. Mount assembly on panel.

3. Secure with 4 brackets and 4 screws at corners of the meter.

4. Use washers as needed to allow for panel thickness.

Notes:

1. Allowable panel thickness: 0.060" – 0.125" (1.5 mm – 3.2 mm)

2. Panel cutout required: 6.62" x 5.43" (168 mm x 138 mm)

3. Mounting plate overall dimensions: 7.57" x 6.40" x 0.125" (192 mm x 163 mm x 3 mm)

4. Mounting brackets require 0.8" (20 mm) on either top or side of meter for installation.

5. This panel mounting kit is not intended to provide waterproof protection to the panel.

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Large Display Temperature Meters Instruction Manual

PD757 Panel Mounting Instructions

DECORATIVE BEZEL

METER COVER

PANEL

METER BASE

BRACKET

Figure 16. PD757 Panel Mounting

14.30" (363)

4.97" (126)

15.32" (389)

3.23" (82)

Ø0.250"

(6.4)

Figure 17. PD757 Panel Mounting Cutout Dimensions

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Large Display Temperature Meters Instruction Manual

Parts Supplied with Panel Mounting Kit:

1. Two angle brackets

2. One self-adhesive decorative bezel

3. Eight #12-24 x ¾" screws

4. Eight #12 lock washers

5. Eight #12-24 hex nuts

6. Four #12 flat washers

Panel Mounting Assembly Instructions:

1. Drill four holes in panel and make panel cutout as shown. Tolerance for all dimensions is ±0.01" (0.25 mm).

2. Secure the two side mounting brackets to the meter base using the supplied hardware.

3. Mount this assembly to the rear of the panel using supplied hardware.

4. Secure the meter cover to the base.

5. Attach decorative bezel to the panel.

Notes:

1. Allowable panel thickness: 0.06" – 0.25" (1.5 mm x 6.4 mm). Longer bracket screws may be used for panel thickness up to 0.5" (12.7 mm).

2. Mounting space required: 7" x 17.5" x 4" (178 mm x 445 mm x102 mm) (H x W x D). Meter cover extends 0.8" (20 mm) - X from the surface of the panel, where X equals the thickness of the panel.

3. This panel mounting kit is not intended to provide waterproof protection to the panel.

4. All dimensions are in inches and millimeters ( ).

Page 53

Large Display Temperature Meters Instruction Manual

Pipe Mounting Instructions for PD755 and PD756

Figure 18. 755 Pipe Mounting Assembly

Figure 19. 756 Pipe Mounting Assembly

Page 54

Large Display Temperature Meters Instruction Manual

Figure 20. Pipe Mounting Plate

Parts Supplied:

1. One mounting plate

2. Two 2" U-bolt kits

3. Four 5/16–18 x 1¼ " screws

4. Four 5/16–18 hex nuts

5. Four 5/16 flat washers

6. Four 5/16 split washers

7. Four 6-32 x ¾" screws

8. Four 6-32 hex nuts

9. Four 6-32 split washers

HARDWARE USAGE TABLE

(Refer to Parts Supplied above)

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

Model Hole

PD755 A X X X X X

PD756 B X X X X X X

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Large Display Temperature Meters Instruction Manual

Explosion-Proof Control Stations

The explosion-proof control stations can be used to control the PD756 while in operation in a hazardous area. Control stations may be ordered with one, two, or three push buttons. The buttons can be labeled ENTER, ACK, and RESET. External connections are available at J1 connector on the main PCB.

Figure 21. Explosion-proof Control Station

Dimensions in Inches and mm( )

Number of

Switches

A B C D E F

Wt lbs

(kg)

Std. Cond. Size

4.5

(114)

4.5

(114)

4.19

(106)

6.19

(157)

5.5

(140)

3.25

(83)

4.5

(2.0)

¾"

7.0

(178)

4.5

(114)

4.19

(106)

6.19

(157)

8.0

(203)

3.25

(83)

6.0

(2.7)

¾"

8.0

(203)

4.5

(114)

4.19

(106)

6.19

(157)

9.0

(229)

3.25

(83)

6.75

(3.1)

¾"

Note: Control Stations have conduit openings centered on top and bottom.

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Large Display Temperature Meters Instruction Manual

OPTION CARD REMOVAL & INSTALLATION

Meter options are installed at the factory. To disable relays’ fail-safe operation, it is necessary to remove the Display PCB to gain access to the Options PCB. Option cards may be ordered separately. Refer to the following instructions and illustrations.

Option Card Installation in PD755

Figure 22. Removing the PD755 Display PCB

Figure 23. PD755 Options PCB Standoffs Location

Page 57

Large Display Temperature Meters Instruction Manual

Figure 24. PD755 Options PCB Installation

Instructions:

1. Disconnect power to the meter prior to removing the front cover.

2. Remove Display PCB and detach PCB from ribbon cable connector.

3. Remove Main PCB from the base by removing four mounting screws.

4. Install Options PCB standoffs, using provided hex nuts.

5. Connect flexible cable connector J2 to J3 connector on Main PCB.

6. Install 4 mounting screws to secure Options PCB to standoffs.

7. Reassemble meter prior to applying power. Front cover may remain off until programming is completed to allow installation of lockout jumper (see Figure 31, page 61).

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Large Display Temperature Meters Instruction Manual

Option Card Installation in PD756

To install the Options PCB into PD756, refer to the following figures.

Figure 25. PD756 Option PCB Installation

Figure 26. PD756 Option PCB Installed

Instructions:

1. Disconnect power to the meter prior to removing the front cover.

2. Remove Display PCB and detach PCB from ribbon cable connector. Display PCB may be removed without removing the faceplate.

3. Remove Main PCB from the base by removing four mounting screws.

4. Install Options PCB standoffs, using provided hex nuts.

5. Connect flexible cable connector J2 to J3 connector on Main PCB.

6. Install 4 mounting screws to secure Options PCB to standoffs.

7. Reassemble meter prior to applying power. Front cover may remain off until programming is completed to allow installation of lockout jumper (see Figure 32, page 62).

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Large Display Temperature Meters Instruction Manual

Option Card Installation in PD757

To install the Options PCB into PD757, refer to the following figure.

Main PCB Options PCB

Figure 27. PD757 Option PCB Installation

Instructions:

1. Disconnect power to the meter prior to removing the front cover.

2. Remove Display PCB and detach PCB from ribbon cable connector.

3. Remove two right-side standoffs and plastic washers; discard plastic washers.

4. Install Options PCB, using the two standoffs removed in step 3.

5. Connect flexible cable connector J2 to J3 connector on Main PCB.

6. Reassemble meter prior to applying power. Front cover may remain off until programming is complete to allow access to ENTER and ACK buttons as well as installation of lockout jumper (see Figure 36, page 64).

Page 60

Large Display Temperature Meters Instruction Manual

MODEL SENSITIVE ILLUSTRATIONS

Removing the Display PCB

Figure 28. Removing the Display PCB on PD755

Figure 29. Removing the Display PCB on PD756

Page 61

Large Display Temperature Meters Instruction Manual

Figure 30. Removing the Display PCB on PD757

Locations of Connections and Jumpers

Figure 31. PD755 Connectors and Jumper Location

Page 62

Large Display Temperature Meters Instruction Manual

Figure 32. PD756 Connectors and Jumper Location

OPTIONS PCBMAIN PCB

Figure 33. PD757 Connectors and Jumper Location

Page 63

Large Display Temperature Meters Instruction Manual

Jumper Arrays and Status LEDs

Figure 34. PD755 Jumper Arrays and Status LED Identification

Figure 35. PD756 Jumper Arrays and Status LED Identification

Page 64

Large Display Temperature Meters Instruction Manual

On the bottom PCB

Figure 36. PD757 Jumper Arrays and Status LED Identification

Page 65

Large Display Temperature Meters Instruction Manual

Front Panel Displays

Figure 37. PD755 Front Panel Display

Figure 38. PD756 Front Panel Display

Figure 39. PD757 Front Panel Display

Page 66

Large Display Temperature Meters Instruction Manual

Overall Dimensions

3.7" (95)

Figure 40. PD755 Overall Dimensions

Figure 41. PD756 Overall Dimensions

Page 67

Large Display Temperature Meters Instruction Manual

Figure 42. PD757 Overall Dimensions

Wall Mounting Dimensions

Figure 43. PD755 Wall Mounting Dimensions

Figure 44. PD755 Wall Mounting Screw Installation

Page 68

Large Display Temperature Meters Instruction Manual

Figure 45. PD756 Wall Mounting Dimensions

13.49" (342.6)

13.54" (344.0)

0.25" (6.2) dia. typ.

3.2" (82)

Figure 46. PD757 Wall Mounting Dimensions

Page 69

Large Display Temperature Meters Instruction Manual

PROGRAMMED PARAMETER SETTINGS

The following table shows the factory setting for most of the programmable parameters on the Digital Temperature Meter. Next to the factory setting, the user may record the new setting for the particular application.

Model: ______________ S/N: _______________ Date: _________

Parameter Display Factory Setting User Setting

Input type

type

J T/C

(

type 0 )

Input Offset

Offset

00000F

Temperature Scale

F or C

Fahrenheit ( f )

Alarm Points Setup

setup

Non-latching (Automatic reset)

set 1

latCH

n (No)

set 2

latCH

n (No)

set 3

latCH

n (No)

set 4

latCH

n (No)

Alarms set points

setpts

Alarm 1

set 1

Set

00100f

Reset

00050f

Alarm 2

set 2

Set

00200f

Reset

00150f

Alarm 3

set 3

Set

00300f

Reset

00250f

Alarm 4

set 4

Set

00400f

Reset

00350f

Output

output

4 mA

000.00f

20 mA

100.00f

Page 70

Large Display Temperature Meters Instruction Manual

OTHER PRECISION DIGITAL PRODUCTS

Model Description

PD118 MINIMUX® Eight Point Scanner

PD128 PLC Annunciator

PD128-NI PLC Annunciator (FM & CSA Approved)

PD141AFO VIGILANTE® four Point Annunciator with First-Out

PD148 AC/DC Input Annunciator (UL Listed)

PD602 DART Low-Cost 1/8 DIN Process Meter

PD650 2.3" LED NEMA 4X Large Display Process Meter

PD655 1.0" LED NEMA 4X Large Display Process Meter

PD656 0.8" LED Exp-Proof Large Display Process Meter

PD660 Low-Cost NEMA 4X Loop Powered Meter

PD661 Low-Cost Exp-Proof Loop Powered Meter

PD673/674 4½ Digit Loop Powered 1/8 DIN Meter

PD675/676 4½ Digit Loop Powered NEMA 4X Meter (FM & CSA)

PD677/678 4½ Digit Loop Powered Exp-Proof Meter

PD680 3½ Digit Loop Powered 1/8 DIN Meter

PD682 3½ Digit Loop Powered 1/8 DIN Meter (FM Approved)

PD686 3½ Digit Loop Powered NEMA 4X Meter (FM & CSA)

PD687 3½ Digit Loop Powered Exp-Proof Meter

PD690 1/8 DIN Universal Process Meter (UL Listed)

PD691 1/8 DIN Universal Strain Gauge Meter (UL Listed)

PD692 1/8 DIN Analog Input Flow Totalizer (UL Listed)

PD693 1/8 DIN Freq/Pulse Input Flow Totalizer (UL Listed)

PD694 1/8 DIN 0-200 VDC Volt Meter (UL Listed)

PD695 1/8 DIN True RMS AC Volt Meter

PD696 1/8 DIN Loop Powered Flow Rate/Totalizer

PD697 NEMA 4X Loop Powered Flow Rate/Totalizer

PD698 Exp-Proof Loop Powered Flow Rate/Totalizer

PD750 1/8 DIN Universal Temperature Meter (UL Listed)

PD765 TRIDENT Process & Temperature Meter

Page 71

Large Display Temperature Meters Instruction Manual

NOTES

Page 72

Large Display Temperature Meters Instruction Manual

LIM755-7_C.doc

SFT002 Ver 1.300 & up

03/03

www.predig.com

How to Contact Precision Digital

• For Technical Support please

call: (800) 610-5239

fax: (508) 655-8990

e-mail: [email protected]

• For Sales Support or to place an order please

call: (800) 343-1001

fax: (508) 655-8990

e-mail: [email protected]

• For Warranty Registration and to Double Your Warranty on-line please visit

www.predig.com

• For an online version of this instruction manual please visit

www.predig.com