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Precision Digital Corporation ProtEx Max PD8-765, Instruction Manual

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Precision Digital Corporation ProtEx Max PD8-765 Instruction Manual Download Page 55

ProtEX-MAX PD8-6000 Explosion-Proof Process Meter 

Instruction Manual 

 

55 

Troubleshooting Tips

 

This meter is a highly sophisticated instrument with an extensive list of features and capabilities. If the front panel 
buttons are used to program the meter, it may be a difficult task to keep everything straight. That is why we strongly 
recommend the use of the MeterView software for all programming activities. A 

free USB adapter

 is available for 

programming with MeterView software if you register your meter.

 

Symptom 

Check/Action 

No display at all 

Check power at power connector 

Not able to change setup or programming, 

LoCd

 is displayed 

Meter is locked, enter correct four-digit password to unlock 

Meter does not respond to input change 

If a Low-Flow Cutoff Value has been programmed, the meter will 
display zero below that point, regardless of the input 

– which can 

appear like the meter is not responding to an input change. 
Check to make sure the problem is not being caused by an 
undesired low-flow cutoff value.  

Meter displays error message during 
calibration (

err

) 

Check: 

1.  Signal connections 
2.  Input selected in 

Setup

 menu 

3.  Minimum input span requirements 

Meter displays 

•

 

open

  

•

 

9999

  

•

 

-1999

  

•

 

Displays negative number, not 
responding to RTD. 

Check: 

1.  Input selected in 

Setup

 menu 

2.  TC/RTD Switch position 
3.  Corresponding signal at Signal connector 

Display alternates between 

1. 

Hi

 and a number  

2. 

Lo

 and a number 

Press 

Menu

 to exit Max/Min  

display readings.  

Display response is too slow 

Check filter and bypass values 

Inaccurate temperature reading 

Check: 

1.  Temperature units (

F or 

C) 

2.  TC type or RTD curve selected 
3.  Offset adjustment 
4.  TC wire used 
5.  Calibration 

If the display locks up or the meter does 
not respond at all  

Cycle the power to restart the microprocessor. 

Relay operation is reversed 

Check: 

1.  Fail-safe in 

Setup

 menu 

2.  Wiring of relay contacts 

Relay and status LED do not  
respond to signal 

Check: 

1.  Relay action in 

Setup

 menu 

2.  Set and reset points 

Meter not communicating with MeterView 
or other programs 

Check: 

1.  Serial adapter and cable 
2.  Serial protocol selected 
3.  Meter address and baud rate 
4.  MeterView address and baud rate 

 

 

Summary of Contents for ProtEx Max PD8-765

Page 1: ...ng Temperature Range 40 to 65 C 40 to 149 F FM Approved as Explosion Proof Dust Ignition Proof Flame Proof CSA Certified as Explosion Proof Dust Ignition Proof Flame Proof ATEX and IECEx Certified as Flame Proof Input Power Options 85 265 VAC 90 265 VDC or 12 36 VDC 12 24 VAC Duplex Pump Controller with Alternation Capability External Contacts for Remote Button Operation On Board RS 485 Serial Com...

Page 2: ...2 ...

Page 3: ... shall not exceed the purchase value repair or replacement of the defective unit See Warranty Information and Terms Conditions on www predig com for complete details Registered Trademarks All trademarks mentioned in this document are the property of their respective owners 2022 Precision Digital Corporation All rights reserved FREE MeterView Programming Software Note PD8 765 meter is not powered f...

Page 4: ...ctions 31 Relays and 24 V Output Connections 32 Switching Inductive Loads 32 RS 485 Connections 33 RS 485 Multi Drop Connection 33 4 20 mA Output Input Signal Connections 34 External Button Contacts 34 Setup and Programming 35 Overview 35 LED Status Indicators 35 Programming Buttons 36 SafeTouch Buttons 36 Display Functions and Messages 37 Main Menu 38 Setting Numeric Values 38 Setting Up the Mete...

Page 5: ...49 Select Menu SElc 49 Linear or Square Root Function linr or Sqrt 49 Low Flow Cutoff cutF 49 Display Intensity inty 50 Meter Copy Function Copy 50 Internal Calibration ICal 51 Meter Operation 52 Buttons Operation 52 Maximum Minimum Readings 52 Remote Operation of Meter Buttons 52 Troubleshooting 53 Diagnostics Menu diag 53 Determining Software Version 53 Reset Meter to Factory Defaults 53 Factory...

Page 6: ...er Powered by Internal Supply 31 Figure 11 Transmitter Powered by External Supply or Self Powered 31 Figure 12 Voltage Input Connections 31 Figure 13 Thermocouple Input Connections 31 Figure 14 Three Wire RTD Input Connections 31 Figure 15 Two Wire RTD Input Connections 32 Figure 16 Four Wire RTD Input Connections 32 Figure 17 Relay 24 V Output Connections 32 Figure 18 AC and DC Loads Protection 3...

Page 7: ...e to program and operate the ProtEX MAX in a hazardous area the programming buttons that are located behind the glass window can be operated without removing the cover by using the SafeTouch through glass buttons The operator puts their finger on the glass over the button and the button is actuated To learn more about SafeTouch buttons see this video predig com videos Safetouch_Buttons Ordering In...

Page 8: ...pgrading your panels Watch this video and see real examples of the PD765 Trident improving existing panels with its huge display predig com videos Trident_X2_Display_Advantages PD765 Trident Demonstration Watch this live demonstration of the PD765 Trident digital panel meter and see how it can improve your process This video will show you the advantage of the large 1 2 display and simulate a level...

Page 9: ... MAX 85 to 265 VAC or 12 36 VDC and the AC powered versions can provide 24 VDC to power the transmitter if needed Programming and setup can be performed with the four SafeTouch through glass buttons free MeterView software or using the Copy function The relays and isolated 4 20 mA output option increases the utility of the PD8 765 The relays can be used for alarm or control applications The 4 20 m...

Page 10: ...ustable intensity for optimum visibility in any lighting condition Four Full Digits The display on the PD8 765 is four full digits which means it can display numbers up to 9999 Many digital devices have displays of only 3 digits which means they can display only to 1999 In practical terms this means the PD8 765 can display type K thermocouples to 2300ºF and 4 20 mA signals up to 9 999 Front Panel ...

Page 11: ...rammed and operated without removing the cover and exposing the electronics in a hazardous area These buttons can be disabled for security by selecting the DISABLE setting on the NO CONTACT BUTTONS switch located on the back of the electronics module inside the enclosure Rugged Heavy Duty Enclosure The ProtEX MAX is housed in a rugged NEMA 4X 7 9 IP68 die cast aluminum enclosure designed to withst...

Page 12: ...uction or whatever else is needed in your facility Each tag comes with a stainless steel wire and lead seal for easy mounting wherever you need it Removable Screw Terminals Industrial applications require screw terminal connections for easy field wiring and the ProtEX MAX goes one step further in convenience by also making them removable Note The terminals on the External Contacts connector are wi...

Page 13: ...fect for temperature applications Fuse Prevents Current Overload Another very useful aspect of the PD8 765 is that the current input is protected against current overload by a resettable fuse The fuse limits the current to a safe level when it detects a fault condition and automatically resets itself when the fault condition is removed Other Uses for Power Supplies The most common use for these tw...

Page 14: ...Alternation The ProtEX MAX can be used as an explosion proof pump controller when combined with a continuous level transmitter The most common pump control application is shown below controlling and alternating two pumps In addition the ProtEX MAX provides the 24 V to power the transmitter Relay 1 turns the main pump on at 6000 gallons and turns it off at 1000 gallons With the Pump Alternation fea...

Page 15: ...surement and output functions including voltage current thermocouple and RTD PD9502 Low Cost Signal Generator The PD9502 is a low cost compact simple to use 4 20 mA or 0 10 VDC signal generator It can easily be set for 0 20 mA 4 20 mA 0 10 V or 2 10 V ranges Signal adjustment is made with a one turn knob A 15 27 VDC wall plug is provided with the instrument Optional USB power bank is available ...

Page 16: ...ers may share one 5 A fuse Normal Mode Rejection 64 dB at 50 60 Hz Isolation 4 kV input output to power line 500 V input to output or output to P supply 6X5 models only 100 V output to 24 VDC supply Overvoltage Category Installation Overvoltage Category II Local level with smaller transient overvoltages than Installation Overvoltage Category III Environmental T6 Class operating temperature range T...

Page 17: ... 20 mA primary variable and it allows the HART communications to pass through without interruption The meter is not affected if a HART communicator is connected to the loop The meter does not display secondary HART variables Temperature Drift 0 to 65 C ambient 40 to 0 C ambient Current 0 20 FS 50 PPM C Voltage 0 02 FS 1 7 PPM C Current 0 80 FS Voltage 0 06 FS Temperature Inputs Inputs Factory cali...

Page 18: ...state Auto Initialization When power is applied to the meter relays will reflect the state of the input to the meter External Button Contacts Number Four Function Remote operation of front panel buttons programming reset relays or view reset max min readings Open State 5 VDC open contact on button input terminals Closed State Closed contact button input terminal to common ground active low 0 to 0 ...

Page 19: ...5 Ta 40 C to 65 C Certificate Number 3047283 CSA Class I Division 1 Groups B C D Class II Division 1 Groups E F G Class III Division 1 Class I Zone 1 Ex d IIC Zone 21 Ex tb IIIC T90 C 40 C Tamb 60 C Temperature Code T6 40 C Tamb 65 C Temperature Code T5 Enclosure Type 4X IP66 Certificate Number 2531731 ATEX II 2 G D Ex d IIC T Gb Ex tb IIIC T90 C Db IP68 Ta 40 C to C T6 40 C to 60 C T5 40 C to 65 ...

Page 20: ...accessed by opening the enclosure To access electrical connectors remove the 2 captive screws and then remove the electronics module Connectors are on the rear of the electronics module Unpacking Remove the meter from box Inspect the packaging and contents for damage Report damages if any to the carrier If any part is missing or the meter malfunctions please contact your supplier or the factory fo...

Page 21: ...ing holes located in the cast in flanges In addition the internal electronic assembly can be rotated to allow the enclosure to be mounted in any position To mount the meter to a wall follow these instructions Prepare a section of wall approximately 7 x 8 5 178 mm x 216 mm for meter mounting by marking with a pencil the mounting holes shown in Figure 1 on the wall Select the appropriate mounting sc...

Page 22: ...t This kit includes two U bolts the necessary hardware and is available in zinc plated steel PDA6848 and 316 stainless steel PDA6848 SS To mount the meter using a U Bolt kit follow these instructions Orient the groove on the back of the instrument with the pipe and secure it to the pipe with the two U bolts and hardware provided Vertical Pipe Mounting Horizontal Pipe Mounting ...

Page 23: ...et The screen shot below shows MeterView software monitoring level in six storage tanks Monitoring System Parts The following table illustrates the parts needed to monitor 10 PD8 765s Quantity Model Description 10 PDA7422 Trident RS 485 Serial Adapter 1 PDA8485 I USB to RS 485 Isolated Converter MeterView Installation 1 Go to www predig com meterview 2 Read instructions copy serial of desired Mete...

Page 24: ...ng options are available from this menu 1 Exit to close the MeterView program Edit Menu The following options are available from this menu 1 Serial Settings to edit the serial communication settings 2 Number of Meters to automatically populate the Main Window with a single meter 10 meters or 100 meters View Menu The following options are available from this menu 1 Event Log to view the MeterView e...

Page 25: ...nputs values for scaling analog output Password Adjust temperature only Filter Bypass Cutoff process inputs only Transmit Delay Function type and Cut off 5 Relay settings 6 After the last change has been made click the Write to Meter button or press Enter on the keyboard to send the new settings to the meter or click on Exit to abandon changes Before sending the new settings MeterView will ask to ...

Page 26: ... to 20 mA box and then click on the desired input type Set Up Decimal Point Click on the arrow next to the dd dd box and then click on the desired decimal point position Decimal point selection is available for 4 20 mA and 0 10 V inputs only The display scale and relay set reset points are adjusted according to the decimal point selection Set Up Temperature Unit Click on the arrow next to the Degr...

Page 27: ...Window Click on Customize in the right click menu to open a meter s customize window The following settings can be programmed from this window 1 Tag Number to identify a meter and optionally display it on the meter Pre selected special characters may be used in this field by simply dragging the desired symbol into it 2 Display Units to identify the engineering units of the value being read and opt...

Page 28: ... user to remotely acknowledge the relays alarms if applicable The text labels and colors for the status indicators may be customized through the Customize window Logging Meter Data to File 1 Click on the arrow next to the Interval box to select an interval from 2 to 60 or select manual to log the data only when the Log button is clicked Log button is only visible when manual is selected 2 Select s...

Page 29: ...ult or installation error occurs high voltage may be present on any lead or terminal Follow all fusing and wiring precautions requirements for the instrument integrated to the PD8 Series model number being connected To access the connectors remove the enclosure cover and unscrew the two captive screws that fasten the electronics module Signal connections are made to de pluggable connectors on the ...

Page 30: ...nectors available with requested configuration It also identifies the location of the RTD TC selector switch The images below and one above show all connector configurations for the PD8 765 Note that the connector in the upper left of the diagram has different configurations based on the model Figure 5 Connector Labeling for PD8 765 6X0 10 Figure 6 Connector Labeling for PD8 765 6X3 20 Figure 7 Co...

Page 31: ...ter Powered by External Supply or Self Powered The current input is protected against current overload by a resettable fuse The display may or may not show a fault condition depending on the nature of the overload The fuse limits the current to a safe level when it detects a fault condition and automatically resets itself when the fault condition is removed Figure 12 Voltage Input Connections The ...

Page 32: ...nly is available at the connector labeled 24V OUT next to the relays connector Figure 17 Relay 24 V Output Connections Switching Inductive Loads The use of snubbers to suppress electrical noise is strongly recommended when switching inductive loads to prevent disrupting the microprocessor s operation The snubbers also prolong the life of the relay contacts Suppression can be obtained with resistor...

Page 33: ...t be provided with its own unique address The meter address Slave ID can be programmed between 1 and 247 The transmit delay can be set between 0 and 199 ms The parity can be set to even odd or none with 1 or 2 stop bits To change the meter address 1 Press and hold the Menu button for three seconds to access Advanced Features menu of the meter 2 Press Up arrow until Serial SErL menu is displayed an...

Page 34: ...65 s two power supplies is for the 200 mA transmitter power supply to power the field transmitter and the other power supply to power the 4 20 mA output from the meter However the power supplies can be used in other ways For instance for level transmitters that require the use of a heated lens the PD8 765 s 200 mA power supply could be used to power both the heated lens and the 4 20 mA signal from...

Page 35: ...ers involved in the setup process of the meter The RTD TC selector switch located between the SIGNAL and SERIAL connectors must be set accordingly for the meter to accept RTD or thermocouple inputs See Figures under Connector Labeling on page 30 Setup and programming is done using MeterView or through the programming buttons After power and input signal connections have been completed and verified...

Page 36: ...rdous area These buttons can be disabled for security by selecting DISABLE on the switch labeled NO CONTACT BUTTONS located on the connector board To actuate a button press one finger to the glass directly over the marked button area Then retract finger more than three inches from the glass before pressing the next button When the cover is removed the four mechanical buttons located next to the se...

Page 37: ...tching operation with manual reset only after alarm condition has cleared Altr Alternate Set relays for pump alternation control oFF Off Disable relay and front panel status LEDs Disable relay s fail safe operation Set1 Set 1 Program set point 1 rSt1 Reset 1 Program reset point 1 Display Parameter Action Setting RLY2 Relay 2 Setup relay 2 Act2 Action 2 Set relay 2 action automatic latching etc Set...

Page 38: ...imal point position for process inputs 3 Units F or C for temperature inputs 4 Relay operation 5 4 20 mA analog output setup Press the Enter Ack button to access any menu or press Up arrow button to scroll through choices Press the Menu button to exit at any time Notes 1 Selecting RTD or TC mode from the Input menu will include the Fahrenheit Celsius menu in the setup menu structure RTD will allow...

Page 39: ...ress Enter Ack to accept Programming the Meter prog The meter may either be scaled ScAL without applying an input or calibrated Cal by applying an input The meter comes factory calibrated to NIST standards so for initial setup it is recommended to use the ScAL function The Program menu contains the Scale ScAL and the Calibrate Cal menus Process inputs may be scaled or calibrated to any display wit...

Page 40: ...erature accurately in any scale The following table shows the recommended low and high calibration points for all types Type of input Input 1 Low Input 2 High Check Middle Type J T C 32 F 1182 F 600 F Type K T C 32 F 1893 F 960 F Type T T C 32 F 693 F 360 F Type T T C 32 0 F 693 0 F 360 0 F Type E T C 32 F 1652 F 840 F 100 RTD 0 00385 32 F 100 1148 F 320 12 590 F 215 61 100 RTD 0 00392 32 F 100 11...

Page 41: ...witch across terminals 4 and C Setting the Relay Action The relays Action menu allows the user to set up the operation of the relays The relays may be set up for any of the following modes of operation 1 Automatic reset non latching 2 Automatic manual reset at any time non latching 3 Latching manual reset only at any time 4 Latching with Clear manual reset only after alarm condition has cleared 5 ...

Page 42: ... with the reset point Setting Sensor Break Condition The sensor break relay condition may be programmed for each relay as On alarm or Off non alarm The relays will enter these states when a sensor break is detected for RTD or thermocouple inputs These settings have no effect when current or voltage inputs are selected Sensor Break Operation The following graphs illustrate the operation of how the ...

Page 43: ...how the operation of the time delay function If the signal crosses the set point the On time delay timer starts and the relay trips when the time delay has elapsed If the signal drops below the set point high alarm before the time delay has elapsed the On time delay timer resets and the relay does not change state The same principle applies to the Off time delay Note The LED is not affected by Tim...

Page 44: ...m with Fail Safe Operation Set Reset Note Relay coil is energized in non alarm condition In case of power failure relay will go to alarm state Low Alarm with Fail Safe Operation Set Reset Note Relay coil is energized in non alarm condition In case of power failure relay will go to alarm state ...

Page 45: ...wn to 1000 gallons and then shuts the pump off The next cycle the backup pump turns on at 6000 gallons and shuts off at 1000 gallons If at any time the active pump can t keep the level below 7000 gallons the other pump would come on also Relay 1 turns the main pump on at 6000 gallons and turns it off at 1000 gallons If the active pump is not able to keep up and the level reaches 7000 gallons the o...

Page 46: ...For instructions on how to program numeric values see Setting Numeric Values page 38 Program the Sensor Break Output Value SEbr The sensor break value corresponds to the output signal generated when the meter detects a sensor break for thermocouple and RTD inputs For example if there is an open thermocouple the meter displays the message open and the analog output goes to the programmed sensor bre...

Page 47: ...oted reading and enter that number as the password e g display reading 1 23 password 0125 Advanced Features Menu To simplify the setup process functions not needed for most applications are located in the Advanced Features menu Press the Right arrow and Menu button simultaneously or hold the Menu button for approximately 3 seconds to access the Advanced Features Menu of the meter 1 Available for t...

Page 48: ...he Adjust menu The offset adjustment feature can be useful to compensate for errors due to thermocouple junctions or excessive lead wire resistance in RTDs The offset adjustment value is automatically reset to zero whenever the type of temperature sensor is changed i e Thermocouple type or RTD curve Celsius Fahrenheit conversion of the offset adjustment value is automatic see note 2 below for impo...

Page 49: ...he PDC or the Modbus protocol PDC protocol should be selected to run MeterView software Select Menu SElc The Select menu is used to select linear or square root function display intensity and low flow cutoff Selection for relay or analog output is a factory setting depending on the option installed Output options are installed and set up at the factory Changing the output selection will cause erro...

Page 50: ...tions Do not connect the two meters to the same 4 20 mA loop while cloning Internal calibration may be affected Connect the two meters using cable assembly PDA7420 or equivalent e g Digi Key P N H1663 07 ND Cable should not exceed 7 2 1 m 1 Power up both meters Leave Clone meter in Run Mode 2 Enter the Advanced Features Menu of the Master meter see Advanced Features Menu page 47 3 Scroll to Copy f...

Page 51: ...moment while meter is accepting the low input 4 After the display stops flashing a number is displayed with the leftmost digit brighter than the rest The bright digit is the active digit that can be changed by pressing the Up arrow button Press the Right arrow button to move to the next digit 5 Set the display value to correspond to the input signal being calibrated 6 The display moves to the high...

Page 52: ...tive Virtual Meter Demo visit predig com tvm Maximum Minimum Readings The main function of the front panel buttons during operation is to display the maximum and minimum readings reached by the process or temperature inputs 1 Press Up arrow Max button to display maximum reading since the last reset power up 2 Press Up arrow Max again to display the minimum reading since the last reset power up 3 P...

Page 53: ...n of the diagnostics messages see Advanced Features Menu Display Messages page 47 Determining Software Version To determine the software version of a meter 1 Go to the Diagnostics menu diAG and press Enter Ack button 2 Press Up arrow Max button and scroll to Information menu Info 3 Press Enter Ack to access the software number SFT version UER Write down the information as it is displayed Continue ...

Page 54: ...2 Action 2 Act2 Automatic Set 2 Set2 10 00 Reset 2 RSt2 9 00 Fail safe flsf Fail safe 1 Fls1 Off Fail safe 2 Fls2 Off Time delay dlay On delay 1 On1 0 sec Off delay 1 Off1 0 sec On delay 2 On2 0 sec Parameter Display Default Setting User Setting Off delay 2 Off2 0 sec Break 1 Brk1 Off Break 2 Brk2 Off Password pass 0000 unlocked Advanced Features N A Adjust Adj 0 0 temp only Filter fltr 10 Bypass ...

Page 55: ...caused by an undesired low flow cutoff value Meter displays error message during calibration err Check 1 Signal connections 2 Input selected in Setup menu 3 Minimum input span requirements Meter displays open 9999 1999 Displays negative number not responding to RTD Check 1 Input selected in Setup menu 2 TC RTD Switch position 3 Corresponding signal at Signal connector Display alternates between 1 ...

Page 56: ...elected on device 3 Instrument address baud rate 4 Program address baud rate If both data status LEDs TX and RX are off when trying to communicate Remove all unnecessary cables and instruments from the bus Try getting the system to work with only one device to ease troubleshooting and then expand the system one device at a time Communications slow Increase the baud rate Random communication errors...

Page 57: ...dd ddd d A385 A392 Type J Type K Type T Type T 0 Type E F C F or C To Program Locked Unlocked TC or RTD Yes No Relays Relay 1 Relay 2 Failsafe Delays Action Set point Reset point Auto Auto Manual Latch Latch w Clear Pump Alt Off To Set point Failsafe 1 Failsafe 2 To Delays Delay 1 Delay 2 On Off Analog output Scale Sensor break To Password RTD or Type T No Yes Calibrate Scale TC or RTD Yes No Prog...

Page 58: ...ax Min displays and Right Arrow resets the Max Min to the current value Press Menu or wait 10 seconds to return to Run Mode Pressing Enter Ack will disable the 10 second timeout and continuously display Max or Min Press Right arrow and Menu to access Advanced Features Menu When the meter is locked Adjust Filter and Bypass can only display their settings and the Copy and ICAL functions are not avai...

Page 59: ...59 ...

Page 60: ...55 8990 www predig com LIM8 765_F SFT031 SFT077 Ver 3 300 up 04 22 Contact Precision Digital Technical Support Call 800 610 5239 or 508 655 7300 Fax 508 655 8990 Email support predig com Sales Support Call 800 343 1001 or 508 655 7300 Fax 508 655 8990 Email sales predig com Place Orders Email orders predig com For the latest version of this manual please visit www predig com ...

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