Table of Contents
Advertisement
Quick Links
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
PRECISION DIGITAL CORPORATION
19 Strathmore Road • Natick MA 01760 USA
Tel (800) 343-1001 • Fax (508) 655-8990
www.predig.com
Advertisement
Table of Contents
Related Manuals for PRECISION DIGITAL PD755
Summary of Contents for PRECISION DIGITAL PD755
-
Page 1: Instruction Manual
• 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 PRECISION DIGITAL CORPORATION 19 Strathmore Road • Natick MA 01760 USA Tel (800) 343-1001 • Fax (508) 655-8990... - Page 2 Large Display Temperature Meters Instruction Manual Visit our website http://www.predig.com...
-
Page 3: Table Of Contents
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... - Page 4 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...
- Page 5 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...
- Page 6 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.
-
Page 7: Introduction
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 24 VDC DESCRIPTION Option... -
Page 8: Model Pd757
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. -
Page 9: Safety Notice
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. -
Page 10: Specifications
4½ digit, high efficiency red LED, automatic lead zero blanking, DISPLAY 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 Automatic, fixed, no user calibration needed. - Page 11 Removable screw terminal blocks accept 22 to 12 AWG wire. CONNECTIONS ENCLOSURE Impact-resistant glass filled polycarbonate, NEMA 4X, modified PD755 specifically for PDC; two holes for ½" conduit provided at base. Explosion-proof sand-cast aluminum – 0.3% max. copper content, PD756 NEMA 3, 4, 7, 9.
-
Page 12: Options
Large Display Temperature Meters Instruction Manual Options Relays 2 or 4 SPDT (form C); rated 2 Amp @ 30 VDC or 2 Amp @ 250 RATING VAC resistive load; HP @ 125 / 250 VAC for inductive loads. User select via JP5 jumper array and SetuP menu. RESET Automatic reset only. - Page 13 Large Display Temperature Meters Instruction Manual Isolated 4-20 mA Transmitter Output The transmitter output can be calibrated so that a 4 mA output is CALIBRATION produced for any number displayed on the meter. The 20 mA RANGE output may correspond to any number displayed on the meter (larger or smaller).
-
Page 14: Display Functions And Messages
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 Indicates the input signal exceeds the full-scale Out of range 9999F range of the meter. -
Page 15: Setup And Programming
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: Jumper Configuration (Page 19) Input selection and lockout jumpers... -
Page 16: Disassembling The Meter
Main PCB may remain attached to enclosure’s base even during conduit hub installation if proper precautions are taken. Disassembling the PD755 Loosen the four screws that hold enclosure’s cover and remove the cover. Remove the four mounting screws holding the Display PCB (see Figure 28, page 60). -
Page 17: Disassembling The Pd757
Large Display Temperature Meters Instruction Manual Disassembling the PD757 Loosen the four screws that hold the enclosure’s cover in place and remove cover. Loosen the top three mounting screws holding the Display PCB (see Figure 30, page 61). Remove the bottom three mounting screws. Slide Display PCB out from under the top three screws. -
Page 18: Reassembling The Meter
After the wiring and jumper selections have been made, reassemble the Display PCB. Reassembling the PD755 Place the Display PCB on top of the four standoffs. Make sure the ribbon cable is connected to the connector on the Display PCB. -
Page 19: Jumper Configuration
(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... -
Page 20: Power Selection
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;... -
Page 21: Labeling Meter For 115 Vac, 230 Vac Or 24 Vdc
Large Display Temperature Meters Instruction Manual Labeling Meter for 115 VAC, 230 VAC or 24 VDC A label on top of the unit CAUTION 115 VAC contains a place for the ALL AC POWERED UNITS ARE 230 VAC user to indicate if the unit is SHIPPED FROM THE FACTORY powered from 115 or 230 24 VDC... -
Page 22: Wiring Instructions
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 All field connections to be made with insulated copper wire, either solid or stranded. -
Page 23: Power Connections
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... -
Page 24: 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. -
Page 25: Figure 5. Two-Wire Rtd Connections
Large Display Temperature Meters Instruction Manual Figure 5. Two-Wire RTD Connections Figure 6. Thermocouple Connections... -
Page 26: Enter, Acknowledgement, And Hold Connections
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 Programs meter via the front panel menu Acknowledges or resets relays, exit menu scroll Holds the temperature reading Hold reading switch ACK switch... -
Page 27: Optional Relays & 4-20 Ma Output Terminals
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. -
Page 28: Isolated 4-20 Ma Output Transmitter Connections
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. -
Page 29: Programming
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. -
Page 30: 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. -
Page 31: General Programming Description
Large Display Temperature Meters Instruction Manual General Programming Description When power is applied to the meter, the display flashes , then it displays 188888 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... -
Page 32: Programming The Basic Meter
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. -
Page 33: Selecting Type Of T/C Or Rtd (Type)
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. -
Page 34: Alarm Setup And Set Points Programming
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. -
Page 35: Setup For Latching Or Non-Latching Relays (Setup)
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 non- latching operation for all relays. -
Page 36: Alarm Set And Reset Points Programming
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. -
Page 37: Programming Alarm Points Using Set Points (Setpts) Menu
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;... -
Page 38: Isolated 4-20 Ma Output Transmitter Option
Large Display Temperature Meters Instruction Manual Isolated 4-20 mA Output Transmitter Option 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. -
Page 39: Input Offset Adjustment (Offset)
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 ( ) menu. -
Page 40: Operation
None 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. -
Page 41: Basic Meter Operation
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 menu HI t LO t... -
Page 42: Relays Operation
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: High or low alarms with latching or non-latching relay operation. -
Page 43: Front Panel Leds
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:... - Page 44 Large Display Temperature Meters Instruction Manual Non-Latching Relay Automatic + manual reset at any time JP5(1-4 on) Condition Relay Normal Alarm Normal 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.
-
Page 45: Acknowledging Relays
Large Display Temperature Meters Instruction Manual Latching Relay Manual reset only after signal passes reset point JP5(1-4 off) Condition Relay Normal Alarm Ack (No effect) Normal In this application, the meter is set up for manual reset only after the signal passes the reset point of the latching relay. -
Page 46: Switching Inductive Loads
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. -
Page 47: Recalibration (Calib)
Large Display Temperature Meters Instruction Manual RECALIBRATION (C ALIB 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. -
Page 48: Recommended Calibration Points
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. -
Page 49: Installation
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. -
Page 50: Panel Mounting Instructions
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 (4) SELF TAPPING (4) MTG. -
Page 51: Pd757 Panel Mounting Instructions
Large Display Temperature Meters Instruction Manual PD757 Panel Mounting Instructions BRACKET METER BASE PANEL METER COVER DECORATIVE BEZEL Figure 16. PD757 Panel Mounting 14.30" (363) Ø0.250" (6.4) 4.97" (126) 3.23" (82) 15.32" (389) Figure 17. PD757 Panel Mounting Cutout Dimensions... - Page 52 Large Display Temperature Meters Instruction Manual Parts Supplied with Panel Mounting Kit: Two angle brackets One self-adhesive decorative bezel Eight #12-24 x ¾" screws Eight #12 lock washers Eight #12-24 hex nuts Four #12 flat washers Panel Mounting Assembly Instructions: Drill four holes in panel and make panel cutout as shown.
-
Page 53: Pipe Mounting Instructions For Pd755 And Pd756
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: Figure 20. Pipe Mounting Plate
Four 5/16–18 x 1¼ " screws Four 5/16–18 hex nuts Four 5/16 flat washers Four 5/16 split washers Four 6-32 x ¾" screws Four 6-32 hex nuts Four 6-32 split washers HARDWARE USAGE TABLE (Refer to Parts Supplied above) Model Hole PD755 PD756... -
Page 55: Explosion-Proof Control Stations
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. -
Page 56: Option Card Removal & Installation
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. -
Page 57: Figure 24. Pd755 Options Pcb Installation
Large Display Temperature Meters Instruction Manual Figure 24. PD755 Options PCB Installation Instructions: Disconnect power to the meter prior to removing the front cover. Remove Display PCB and detach PCB from ribbon cable connector. Remove Main PCB from the base by removing four mounting screws. -
Page 58: Option Card Installation In Pd756
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: Disconnect power to the meter prior to removing the front cover. Remove Display PCB and detach PCB from ribbon cable connector. -
Page 59: Option Card Installation In Pd757
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: Disconnect power to the meter prior to removing the front cover. Remove Display PCB and detach PCB from ribbon cable connector. -
Page 60: Model Sensitive Illustrations
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: Locations Of Connections And Jumpers
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: Figure 32. Pd756 Connectors And Jumper Location
Large Display Temperature Meters Instruction Manual Figure 32. PD756 Connectors and Jumper Location MAIN PCB OPTIONS PCB Figure 33. PD757 Connectors and Jumper Location... -
Page 63: Jumper Arrays And Status Leds
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: Figure 36. Pd757 Jumper Arrays And Status Led Identification
Large Display Temperature Meters Instruction Manual On the bottom PCB Figure 36. PD757 Jumper Arrays and Status LED Identification... -
Page 65: Front Panel Displays
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: Overall Dimensions
Large Display Temperature Meters Instruction Manual Overall Dimensions 3.7" (95) Figure 40. PD755 Overall Dimensions Figure 41. PD756 Overall Dimensions... -
Page 67: Wall Mounting Dimensions
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: Figure 45. Pd756 Wall Mounting Dimensions
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. Figure 46. PD757 Wall Mounting Dimensions... -
Page 69: Programmed Parameter Settings
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: _________... -
Page 70: Other Precision Digital Products
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) - Page 71 Large Display Temperature Meters Instruction Manual NOTES...
- Page 72 Large Display Temperature Meters Instruction Manual How to Contact Precision Digital • For Technical Support please call: (800) 610-5239 fax: (508) 655-8990 e-mail: support@predig.com • For Sales Support or to place an order please call: (800) 343-1001 fax: (508) 655-8990 e-mail: sales@predig.com...
Need help?
Do you have a question about the PD755 and is the answer not in the manual?
Questions and answers