Product Manual - Vorne Industries, Inc.
Contents
1. V Vorne Industries Model 77 719 Analog to Digital Display User s Manual 1445 Industrial Drive Itasca IL 60143 1849 630 875 3600 Telefax 630 875 3609 Model 77 719 Analog to Digital Display Table of Contents 1 INTRODUCTIONTO THEDISPLA Y 1 1 Operations ee cda ETS 3 2 WIRING AND SPECIFICATIONS 2 1 o MR ON 3 2 2 Input Range ite csset a asiaate tis esae edat s na 3 2 3 Sc ling the Displayen nete E E E E A E TE 3 2 4 Reset his EE EA bl 4 2 5 DC Output Voltage 5 5 eere ee re Seo teet dea oi eda R evida 4 2 6 Power Requirements o oeste gea snee se On ERU on adu dau op SR UMORE a 4 2 7 Accessing the Logic Board i eee sei treat tnis eee r aa e ern eee np aes 4 2 8 VANDE cet eaten ite Rite a a RE E LUE 4 3 CALIBRATION PROCEDURE 3 1 Equipment Needed ssn sia 21 te rir i ko order ia ai 5 3 2 Location of Trim Potentiometers eese enne 5 3 3 LogicBoard Overview sonic sa A EA AEO N ia aada 5 3 4 Calibration PEOR SQUE aial a V E A a 5 3 5 b nici Ol MT 6 3 6 Selecting Normal Mode estere as kohana vanake HUS SAN OPUS TENE ME Eee Mata 6 3 7 Secure Fri Pot SetnB eseese erri tes ture toc e odd aas epi 6 3 8 hnc 6 3 9 DIMENSIONS oea E EA E Page2 Model 77 719 Analog to Digital Display 1 INTRODUCTION TO THE DISPLAY 1 1 Operation The model 77 719 accepts analog input data converts itto digital information scalesitin accordance with use2. dimensions in inches Bezel Mount 3 16 Dia 6 Places A B C D E F G H J K L M 3 digit 11 75 7 0 9 15 3 80 30 1 0 4 87 45 65 45 10 85 5 90 4 digit 14 50 7 0 11 90 3 80 30 1 0 6 25 45 65 45 13 60 5 90 S digit 17 25 7 0 14 65 3 80 30 1 0 7 63 45 65 45 16 35 5 90 6 digit 20 0 7 0 18 40 3 80 30 1 0 9 00 45 65 45 19 10 5 90 All dimensions in inches Dimensions of panel cutout Model 77 719 Analog to Digital Display Page7 Vorne Industries Incorporated 1445 Industrial Drive Itasca IL 60143 1849 Phone 630 875 3600 Fax 630 875 3609 P0061R05
3. 7 719 logic board showing calibration points 3 2 Location of Trim Potentiometers There are three 20 turn pots which are adjusted in the calibration procedure The first is the Op Amp gain adjust a 10K Ohm pot marked on its side 103 located next to the eight pin LM308 Op Amp IC There should also be a short piece of wire extending vertically from the logic board next to the Op Amp This is the test point for reading the output voltage of the Op Amp If this wire is missing reading must be taken directly from pin 6 of the LM308 The second pot is the A D zero adjust a 50K Ohm pot marked on its side 503 located next to the 16 pin AD2020 A D converter IC The third pot is the A D gain adjust a 10K Ohm pot marked on its side 103 also located next to the AD2020 3 3 Logic Board Overview Transformer g LM ae 73 308 ain ri 8 1 z e Test Point 1 o e Test Point 2 FE AD AD Gain o AD Zero 2020 A B A B 16 1 JIA Current J2A Scaled J1B Voltage J2B Percent 40 9 Scaled Display Range nunnnnnnnunnnunnnunnnnnnnt Processor UUuuuuuuuuuuuuuuuuUuu 1 CA3162 is an equivalent part 3 4 Calibration Procedure Note Units that have 4 20 mA or 1 5 V input are calibrated as if they are 0 20 mA or 0 5 V respectively This is because the microprocessor software compensa
4. llowing zeros up to 3 The bottom of range corresponds to the lowest valid analog input value and the top of the range corresponds to the highest valid analog input value A new setting of the scaling switches is entered after reset or power up Example Bottom of range set to 1 1 5 0 top of range set to 1 8 5 0 Bottom of range 150 x 10 1500 Top of range 850 x 10 8500 BOTTOM OF RANGE TOP OF RANGE No of Zeros MSD D2 LSD No of Zeros MSD D2 LSD 67 89 e 89 e 89 67 8g e 89 67 89 67 89 67 89 Ae Se Ee De fe SO Fa taa un T2 551 To 4721 Aaa Model 77 719 Analog to Digital Display Page 3 2 4 Reset Internally pulled high this active low input requires a contact closure to ground with a minimum 10 millisecond duration A reset input places the unit ina state equivalent to power up ready to acceptaninput display showing scaled analoginput 2 5 DC Output Voltage A regulated output voltage of 5 or 12 volts DC at 100 milliamps can be provided for auxiliary use 2 6 Power Requirements 120 VAC 15 15 VA AC hot and neutral are wired to terminal 1 and 2 polarity not important Terminal 3 is Earth Ground only Also available in 220 VAC amp 24 VDC 2 7 Accessing the Logic Board All wiring points are located on the logic board of the 77 719 This board is mounted to the front panel of the display For access remove
5. puts on terminals 6 amp 7 The displayed value should correspond with the bottom row of the chart for each input level If there is any disparity repeat steps 2 5 FULL RANGE 0 25 50 75 100 INPUT TYPE 4 20 mA 0 00 mA 5 00 mA 10 00 mA 15 00 mA 20 00 mA INPUT TYPE 0 1 V 0 0mV 250 0mV 500 0 mV 750 0mV 1000 0mV INPUT TYPE 0 5 V 0 000 V 1 250 V 2 500 V 3 750 V 5 000 V INPUT TYPE 1 5V 0 000 V 1 250 V 2 500 V 3 750 V 5 000 V INPUT TYPE 0 10 V 0 000 V 2 500 V 5 000 V 7 500 V 10 000 V Display should show 000 249 251 499 501 749 751 999 3 6 Selecting Normal scaled Mode Power down the display and return the shorting jumper near pin 21 of the microprocessor to the scaled position The display will now operate per Section 1 1 Operation 3 7 Securing Trim Pot Setting After the unit is calibrated secure the trim pot settings by dotting silicon rubber or nail polish on the shaft of the pots 3 8 Notes Page6 Model 77 719 Analog to Digital Display 3 9 Dimension Not to scale Stand Alone Enclosure 3 16 Dia 6 Places E Pr 3 9 A B C D E F G H J K 3 digit 10 85 7 10 9 15 3 80 35 55 4 87 1 05 2 25 85 4 digit 13 60 7 10 11 90 3 80 35 55 6 25 1 05 2 25 85 5 digit 16 35 7 10 14 65 3 80 35 55 7 63 1 05 2 25 85 6 digit 19 10 7 10 18 40 3 80 35 55 9 00 1 05 2 25 35 All
6. r preset scale factor switches and displays the scaled data on 3 3 inch high digits Various standard voltage and current analog input ranges are available and special ranges can be accommodated Over range analog inputs are indicated by flashing nines on the display Two sets of rotary dip switches are available to the user for scaling the display One sets the bottom while the other sets the top of the analog input range The display is linear between the two set points Display accuracy is to three significant digits 2 WIRING AND SPECIFICATIONS 2 1 Display The display contains from 2 to 6 digits with 3 3 high LED characters An optional decimal point in front of any digit position is available 2 2 Input Ranges 1 Voltage All three voltage input ranges 0 1 Volt 0 5 Volt 0 10 Volt have an input impedance such that the maximum current drawn by the unit will be 05 milliamp at the top of the inputrange 2 Current The current input range 4 20 milliamps has an input impedance of 44 ohms between terminals 6 and 7 thereby creating a voltage drop of less than 1 Volt at the top of the input range 2 3 Scaling the Display Two sets of four rotary BCD dip switches on the main logic board allow the user to select bottom of range Floor and top of range Ceiling values The three rightmost switches in each set labeled MSD D2 and LSD set specific numbers The leftmost switch in each set labeled of zeros determines the number of fo
7. tes in normal scaled mode operation for this special scaling requirement 1 Selecting Calibration Mode Power down the display and activate the calibration mode by moving the shorting jumper near pin 21 of the microprocessor from the scaled position to the percent position Power up the display Model 77 719 Analog to Digital Display Page 5 2 Op Amp Gain Adjust Use DVM 1 to read the input at terminals 6 and 7 Use DVM 2 to read the voltage in milli volts out of the Op Amp utilizing the test point Adjust the input so itis at maximum at terminals 6 and 7 DVM 1 For a4 20 mA input maximum is 20 00 mA For a voltage input maximum is generally 1 000 V 5 000 V or 10 00 V depending on the type of input ordered Withtheinputatmaximum trim the Op Amp gain pot so that the op amp output DVM 2 is 1 000 Volts exactly 3 A D Zero Adjust Adjust the input at terminals 6 and 7 so it is at 0 000 whether the input is current or voltage Trim the A D zero adjust pot so that the display reads 000 A lower case backwards c in the third position of the display indicates under range 4 A D Gain Adjust Adjust the input so itis at maximum as in step 2 Trim the A D gain pot until the display is on the threshold between 999 and lower case backward c s 3 5 Verification To verify proper calibration use the chart below Locate the row which is marked to correspond with the input type you have Use the listed values as in
8. the six 8 screws which hold the front panel to the rest of the enclosure EN Warning Shock Hazard VAN y h A Disconnect power to the display prior to removing the front panel 1 x i Do not reapply power until the front panel has been reinstalled e 2 8 Wiring ololo KONIKON KONIK ONKO 1 2 3 4 5 6 7 8 120 120 EARTH DC DC IN IN RESET VAC VAC GND GND OUT 2 Screw terminal strip mounted on a PC board inside the enclosure SAFETY GROUND On AC power units use a 3 wire grounded power cord with the earth ground tied to terminal 3 3CALIBRATION PROCEDURE NOTE Units are calibrated at the factory and re calibration should not be necessary There calibration procedure should be performed if any one ofthe following symptoms are observed 1 With the minimum specified input the unit displays backward C s 2 With the minimum specified input the unit displays any number not equal to the bottom range in scale mode or gt 0 in percent mode 3 Witha maximum specified input the unit displays any out of range number Please consult with the factory concerning questions about the calibration procedure orre calibration Page4 Model 77 719 Analog to Digital Display 3 1 Eguipment Needed One ortwo digital voltmeters capable of measuring milli volts and milliamps The calibration instructions are written for two DVMs between test points See Section 3 3 fora diagram of the 7
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