Tek-Trol Tek-LCD 7802A Instruction Manual Download Page 14 | Manualshive

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Tek-Trol Tek-LCD 7802A Instruction Manual Download Page 14

Figure 3. Input Connections with Loop-Powered Backlight

Figure 4. Input Connections with Externally-Powered Backlight

It is possible to use the same transmitter (signal loop) power supply for the externally powered
backlight. The backlight circuit will draw 25 mA in addition to the loop circuit.

3.2

External Reset Connection

External reset connections are made to two terminals labelled Reset. Connect to a contact closure
source such as a relay or a pushbutton as shown in Figure 5.

Figure 5. Reset Connections

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Summary of Contents for Tek-LCD 7802A

Page 1: ...Technology Solutions www tek trol com TEK LCD 7802A NEMA 4X Loop Powered Flow Rate Totalizer Indicator Instruction Manual Document Number IM 7802A ...

Page 2: ...t Customer Support 796 Tek Drive Crystal Lake IL 60014 USA Tel 1 847 857 6076 1 847 655 7428 www tek trol com No part of this publication may be copied or distributed transmitted transcribed stored in a retrieval system or translated into any human or computer language in any form or by any means electronic mechanical manual or otherwise or disclosed to third parties without the express written pe...

Page 3: ...e Meter SETUP 18 4 4 4 Setting the Decimal Point dEc_PT 19 4 4 5 Programming the Meter PRoG 20 4 4 6 Scaling the Meter SCALE 21 4 4 7 Calibrating the Meter CAL 22 4 4 8 Setting the Time Base tbAsE 23 4 4 9 Setting the Total Conversion Factor totCF 23 4 4 10 Manual or Automatic Total Reset Function t rST 24 4 4 11 Setting the Tag Display tAG 25 4 4 12 Setting Up the Password PASSWRD 26 4 4 13 Disab...

Page 4: ...ternal Calibration ICAL 33 4 5 14 Error Message SPAn ERROR 34 4 5 15 Information INFO 34 5 Operation 35 5 1 Front Panel Buttons Operation 35 5 2 Maximum Minimum Readings MAXIMUM MINIMUM 35 5 3 Reset Meter to Factory Defaults 36 5 4 Factory Defaults User Settings 37 6 Troubleshooting 38 6 1 Troubleshooting Tips 38 7 Quick User Interface Reference 39 7 1 Operational Modes 39 ...

Page 5: ...her own risk Tek Trol LLC shall not be held liable for damages resulting from such improper use Failure to follow installation guidelines could result in death or serious injury Make sure only qualified personnel perform the installation CAUTION Read complete instructions prior to installation and operation of the meter Limited Warranty Tek Trol LLC warrants this product against defects in materia...

Page 6: ...ce should be performed only by trained service personnel Wiring connectors are accessed by opening the enclosure To access electrical connectors remove the 2 captive screws then disconnect the ribbon cable from the display module and set the display module aside 1 2 Unpacking Remove the meter from box Inspect the packaging and contents for damage Report damages if any to the carrier If any part is...

Page 7: ...lows for easy installation of tamper seals 2 2 Specifications Except where noted all specifications apply to operation at 25 C General Display Five digits 9999 to 99999 0 70 0 05ft high 7 segment automatic lead zero blanking Seven characters Total and or Tag 0 4 0 03ft high 14 segment 7 digit Totalizer 9 999 999 Symbols High Low Set Alarm Password Lock Backlight White Display Update Rate Ambient 2...

Page 8: ...3 years parts and labor Input Accuracy 0 03 of calibrated span 1 count square root programmable exponent accuracy range 10 100 of calibrated span Advanced Function Linear square root or programmable exponent Multipoint Linearization 2 to 32 points Programmable Exponent 1 0001 to 2 9999 Low Flow Cut Off 0 99999 0 disables cutoff function Temperature Drift 50 PPM C from 40 C to 75 C 40 to 167 ambien...

Page 9: ...rip point Deadband 0 100 FS user selectable Acknowledge Front panel ACK button resets output and screen indication Pulse Output K Factor K factor programmable from 0 0001 to 99999 One pulse is generated for every total increment selected e g K factor value of 100 will generate one pulse every time the total is incremented by 100 units If the pulse output exceeds the programmed output frequency pul...

Page 10: ...2 3 Dimensional Drawing Enclosure Dimensions Front View Enclosure Dimensions Side Cross Section View ...

Page 11: ... Steel Pipe Mounting Kit Tek LCD 7800A 6846SS Stainless Steel Pipe Mounting Kit 2 5 Mounting The Tek LCD 7802A has two slotted mounting flanges that may be used for pipe mounting or wall mounting Alternatively the unit may be supported by the conduit using the conduit holes provided Refer to Dimensional Drawing page 8 for details WARNING Do not attempt to loosen or remove flange bolts while the me...

Page 12: ...A signal input positive terminal connection SIGNAL 4 20 mA signal return negative terminal connection when not using loop powered backlight BACKLIGHT 9 30 VDC when powering backlight from external supply BACKLIGHT 4 20 mA signal return negative terminal when using the installed loop powered backlight or ground negative when powering backlight from external supply OUTPUT NPN open collector output p...

Page 13: ...cklight only the two signal terminals are connected The 4 20 mA input with no backlight has a maximum voltage drop of 3 V and is wired as shown in Figure 2 The loop powered backlight configuration requires a total maximum voltage drop of 6 V The backlight is recommended for dim lighting conditions and is enabled when wired as shown in Figure 3 or Figure 4 Figure 2 Input Connections without Backlig...

Page 14: ...smitter signal loop power supply for the externally powered backlight The backlight circuit will draw 25 mA in addition to the loop circuit 3 2 External Reset Connection External reset connections are made to two terminals labelled Reset Connect to a contact closure source such as a relay or a pushbutton as shown in Figure 5 Figure 5 Reset Connections ...

Page 15: ... or pulse counter as shown in Figure 6 or drive a relay as shown in Figure 7 To avoid damaging the Tek LCD 7802A s amplifying components use care not to wire incorrectly or exceed output ratings A diode such as 1N4000 series will provide protection from relay transients Figure 6 Connection to Device with Internal Pull Up Figure 7 Output Connections ...

Page 16: ...r 60 seconds of inactivity The through window buttons are designed to filter normal levels of ambient interference and to protect against false triggering however it is recommended that the through window buttons be disabled slide switch to LOCK if there is an infrared interference source in line of sight to the display Through Window Button Tips To remove cover with power applied safe area only o...

Page 17: ... to move to the next digit or decimal position during programming Press the Up arrow button to scroll through the menus decimal point or to increment the value of a digit Press the Enter button to access a menu or to accept a setting Press and hold the Menu button for five seconds to access the Advanced features of the meter ...

Page 18: ...program input 1 value DspL1 Display 1 Program display 1 value Inpt2 Input 2 Calibrate input 2 signal or program input 2 value DsPl2 Display 2 Program display 2 value Span Error Span Error Error calibration not successful check signal TbASE Time Base Enter the Time Base menu sEc Second Units per second min Minute Units per minute hour Hour Units per hour dAy Day Units per day TotCF Conversion Facto...

Page 19: ...nu consists of the most commonly used functions Setup Password and Service Press Menu button to enter Programming Mode then press the Up Arrow button to scroll through the main menu Press Menu button to enter Programming Mode then press the Up Arrow button to scroll through the main menu Press Menu at any time to exit and return to Run Mode Changes made to set tings prior to pressing Enter are not...

Page 20: ...hout saving changes The decimal point is set using the Right or Up arrow button in the Setup decimal point menu 4 4 3 Setting Up the Meter SETUP The Setup menu is used to select 1 Rate and total decimal point position 2 Program menu 3 Rate and total tag display 4 Time base 5 Total conversion factor 6 Manual or automatic total reset function Press the Enter button to access any menu or press Up arr...

Page 21: ...decimal point at all Total decimal point may be set with up to six decimal places or with no decimal point at all Rate decimal and total decimal are programmed individually Pressing the Right arrow moves the decimal point one place to the right until no decimal point is displayed Pressing the Up arrow moves the decimal point one place to the left Select Rate Decimal Point ...

Page 22: ...to apply a signal from a calibrator or a flowmeter for the default 2 point scaling NOTE The Scale and Calibrate functions are exclusive of each other The meter uses the last function programmed Only one of these methods can be employed at a time The Scale and Calibrate functions can use up to 32 points default is 2 The number of points should be set in the Advanced menu under the Multi Point Linea...

Page 23: ... to display the process in engineering units A signal source is not needed to scale the meter simply program the inputs and corresponding display values Figure 8 Scale Menu For instructions on how to program numeric values see 4 4 2 Setting Numeric Values page 18 ...

Page 24: ... Inpt1 Apply a known signal and press Enter The display will flash while accepting the signal 3 After the signal is accepted the meter displays dspl1 Press Enter Enter a corresponding display value for the signal input and press Enter to accept 4 The meter displays Inpt2 Apply a known signal and press Enter The display will flash while accepting the signal 5 After the signal is accepted the meter ...

Page 25: ... at least every twelve months Refer to Internal Calibration ICAL page 33 for instructions 4 4 8 Setting the Time Base tbAsE The meter calculates total based on rate and a time base of units per second minute hour or day Press the Enter button at any time to accept a setting or Menu button to exit without saving changes X 4 4 9 Setting the Total Conversion Factor totCF Total Conversion Factor is us...

Page 26: ...s reached the meter waits for a programmed amount of time t dly and then resets the total to zero To enable total reset by Reset button choose m An EnAbl To disable total reset by Reset button choose m An dsAbl To reset total upon total alarm set point choose auto enter a time delay tdly and proceed to programming the set point see page 30 Press the Enter button at any time to accept a setting or ...

Page 27: ...play between total reading for ten seconds and tag for two seconds choose tOGlE To disable the tag display and show only total reading uninterrupted on the lower display choose Off To show tag only on the lower display choose On Totalizing continues in the background but is not shown while On is selected Selecting On or tOGlE prompts for entry of the tag The unit being changed blinks Press the Ent...

Page 28: ...opriate it may be recorded in the space provided Model Serial Number Password _ _ Making Changes to a Password Protected Meter If the meter is password protected the meter will display the message LOCKED when the Menu button is pressed Press the Enter button while the message is being displayed and enter the correct password to gain access to the menu After exiting the programming mode the meter r...

Page 29: ...orarily disable the through window buttons to prevent inadvertent use Buttons will automatically resume operation after 60 seconds The display blinks the message SERVICE during this period This should be used when cleaning the window and when installing or removing the cover while power is applied in a safe area only The service menu is not shown when the through window buttons are disabled using ...

Page 30: ...unction menu LnEAr Linear Set linear scaling SquAr Square Root Set square root extraction ProG E Programmable Exponent Set programmable exponent CUTOFF Low Flow Cutoff Set low flow cutoff FILTER Filter Set noise filter OFF Filter Off Disable noise filter LO Filter Low Set noise filter to low setting NmED Filter Medium Set noise filter to medium setting HI Filter High Set noise filter to high setti...

Page 31: ...ated in the Advanced features menu Press and hold the Menu button for five seconds to access the Advanced features menu Press the Enter button to access any menu or press Up arrow button to scroll through choices Press the Menu button to exit at any time Hold for five seconds Run Mode INFO ICAL 3024 7 74325 68 ...

Page 32: ...rip point program set point above reset point Rate low alarm trip point program set point below reset point Rate alarm deadband is determined by the difference between set and reset points Minimum deadband is one display count If set and reset points are programmed the same output will reset one count below set point Total alarm trip point program total set point Alarm reset is triggered by total ...

Page 33: ...display that is linear with respect to the input signal 4 5 6 Multi Point Linearization lnEAr Up to 32 linearization points can be selected under the Linear function The multi point linearization can be used to linearize the display for non linear signals such as those from level transmitters used to measure volume in odd shaped tanks or to convert level to flow using weirs and flumes that require...

Page 34: ...gate back to the Save menu screen SAUE and press the Enter key to save the changes Figure 9 Multi Point Linearization Menu 4 5 9 Square Root Linearization SquAr The square root function can be used to linearize the signal from a differential pressure transmitter and display flow rate in engineering units 4 5 10 Programmable Exponent Linearization ProG E The programmable exponent can be used to lin...

Page 35: ...layed immediately 4 5 13 Internal Calibration ICAL The noise filter is available for unusually noisy signals that cause an unstable process variable display The noise filter averages the input signal over a certain period The filter level can be set to low LO medium mEd high HI or off OFF The higher the filter setting the longer the averaging time and so the longer the display may take to find its...

Page 36: ...e indicates that the calibration process was not successful After the error message is displayed the meter will revert to input 2 calibration settings The error message might be caused by inadvertently leaving the signal at the previous level or not maintaining the minimum span Press the Menu button to cancel the current calibration process if necessary 4 5 15 Information INFO The Internal calibra...

Page 37: ...s MAXIMUM or MINIMUM to differentiate between run mode and max min display Press Enter to remain in Max Min display mode If Enter is not pressed the Max Min display reading will time out after ten seconds The meter will return to display the actual reading Press Up to Display and to Toggle Between Max Min Press Enter to hold Max Min Press Right to Reset Max Min Press Menu to Exit Max Min Run Mode ...

Page 38: ...up process from the factory defaults Instructions to load factory defaults Enter the Advanced features menu Press and hold Reset button when INFO is shown Press Enter when RESET DFALTS prompt is shown Note If Enter is not pressed within three seconds the prompt will stop flashing return to showing INFO Press and Hold for 5 sec Defaults Restored INFO Flashing Display ...

Page 39: ...___ Parameter Display Default Setting User Setting Programming PROGRAM Scale Input 1 InPt1 4 000 mA Display 1 Dspl1 4 000 Input 2 InPt2 20 00 mA Display 2 Dspl2 20 000 Decimal point rate Dd ddd 3 places Decimal point total Dddddd dd 2 places Tag tAG Off Time Base tbAsE Minute Conversion Factor TotCF 1 0000 Total Reset Function T rst Manual Enabled Password PASSWRD 00000 unlocked Advanced Features ...

Page 40: ...Min display readings Display response is too slow Check filter setting to see if it can be lowered to LO or OFF If the display locks up or the meter does not respond at all Perform hard reset by shorting S and S terminals Backlight does not appear Backlight is intended for viewing assistance in dim lighting conditions It may not be noticeable under good lighting conditions Check connections are as...

Page 41: ...t digit Go to Max Min Mode Enter Ack Accept selection value and move to next selection Acknowledge Alarm Menu held for 5 seconds enters Advanced Features Menu Max Min Mode While in Run Mode pressing Up Arrow will initiate Max Min Mode Up Arrow toggles between Max 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 ...

Page 42: ...Main Menu Advanced Menu ...

Page 43: ... Analyzers Accessories TekValSys 796Tek Drive Crystal Lake IL 60014 USA Tel 1 847 857 6076 1 847 655 7428 Fax 1 847 655 6147 Email tektrol tek trol com www tek trol com Tek Trol is a fully owned subsidiary ofTEKMATION LLC We oﬀer our customers a comprehensive range of products and solutions for process power and oil gas industries Tek Trol provides process measurement and control products for Flow...

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