NCI 7821 User Manual - Avery Weigh
Contents
1. Table of Contents Table of Contents 2 3 SPSCIICATIONS ssrin en 4 Unpacking and Installing the Scale 3 Operation er 5 Power UD 2 2 5 Modes of Operation nnennennnnnnnnnnn nenn 6 Diagnostics Mode una 10 Configuration Mode SODERRRERERREEERERDEREEDEFEERHEREEREPEEUURE EUER 14 Calibration Moden een 16 Gravity MOQ E ressens taan 18 Error CodeS een 19 COMMUNICAWOM 2er 19 Troubleshooting ensure 22 Spare Pants List uncreisnaeanenaaa 23 Model 7821 Bench Scale User s Manual 3 Specifications Capacity and Resolution Approvals Zero Window Transformer Voltage Frequency Power Requirements Modei Capacity Ib Capacity kg 7821 70 150 x 05 Ib 60 x 02 kg 3000d 70x 02 kg 3500d S sosoo rexong roo 150 x 02 Ib 75 x 01 kg 7500d 7821 100 200 x 05 Ib 4000d ee LE EP soos Model 7821 70 7821 75 and 7821 100 USA NTEP COC 95 070 Canada Ministry of Industry AM5076 Initial automatic zero setting is 10 of maxi mum capacity active at power up Manual zero setting range is 2 of maximum capacity active using the ZERO key Input 120 VAC 10 15 Standard 3 wire w ground Output 15 VDC 3 Amps DC minimum 60 Hz Standard 0 1 Amp maximum 4 Model 7821 Bench Scale User s Manual Unpacking and Installing the Scale Unpacking the Scale Installing the Scale Cutout Dimensions Attaching Velcro Fasteners Optional2. 0 DONE Scale capacity is prompted LOAD Sec Tabled forthe lek ot Press the UNITS key to move 4 in the menu CAP alternative weight available for different capacities Press the ZERO key to move in the menu After making a selection the display generally moves to the next parameter in the list After choosing done the display shows DIAG FILT BAUD PROT Indicates Factory DONE Default Settings Choose from a list of 12 baud and parity options See Table 2 If scale is pi ESH filter to mini 8213 3835 aced in noisy SLO environment set slow mize the effects DISP RA RO 1 0 HRESA HRESN LOC G CAL G DONE Performs a display test Performs a test of RAM Performs a Performsa Performsa Performsa Displays the Displays the testof ROM input output division test division test current calibration test w AZT w o AZT gravity value gravity value Model 7821 Bench Scale User s Manual Alternative Calibration Span Points Baud Rate and Parity Options The NCI 7821 bench scale allows calibration of the scale using less than full capacity weights The following tables show alternative weights that can be used to calibrate the scale at its desig nated capacity See Table 1 for alternate calibra tion
3. ITS key changes the unit of measure between Ib and kg kal WEIGHT J a coo Wi CAPACITY 200 x 0 05 Ib 100 x 0 02 kg The NCI 7821 bench scale has an optional remote display Typically the remote display is used to display weight only i e the ZERO and UNITS keys are not operable Alternatively it is possible to have operable ZERO and UNITS keys on the remote display but in so doing the keys must be disabled on the local or internal display To activate the ZERO and UNITS keys on the remote display set dip Switch 3 to the OPEN position With Switch 2 set to OPEN you can adjust the local gravity value Press the ZERO key to increase the value or press the UNITS key to decrease the value See Gravity Adjustment section for details Model 7821 Bench Scale User s Manual 7 Figure 2 Menu Structure Normal Weighing Mode Set Switch 1 to Set Switch 2 to the OPEN Position the OPEN Position Menu Mode DIAG CONF CAL R LBS 1000G UON UOFF 9 XXXX To increase local gravity setting press and hold ZERO key To decrease value press and hold the UNITS key eturn Switch 2 to CLOSED position when done crass H SCALE 150 1 150 2 150 3 150 4 200 Ib 60 02 70 02 75 02 75 01 100 02 kg LOAD
4. Model 7821 incil Bench Scale ME E WEIGHT User s Manual UNITED STATES This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 ofthe FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equip ment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense CANADA This digital apparatus does not exceed the Class A limits for radio noise emissions from digital apparatus set out in the radio Inter ference Regulations of the Canadian Department of Communica tions Le present appareil numerique n emet pas de bruits radioelectroniques depassant les limites applicables aux appareils numeriques de la Class A prescrites dans le Reglement sur le brouillage radioelectrique que edicte par le ministre des Commu nications du Canada CAUTION Risk of electrical shock Do not remove cover No user serviceable parts inside Refer servicing to qualified service personnel Weigh Tronix reserves the right to change specifications at any time 11 19 02 PN 7424 15813E e1
5. UNITS key when the choice you want is displayed The choice is accepted and the display shows FILT Press the ZERO key BAUD is displayed Press the UNITS key The current baud and parity choice is displayed Use the ZERO key to scroll the choices found in Table 2 When the choice you want is displayed press the UNITS key The choice is accepted and the display shows BAUD Press the ZERO key PROT is displayed Press the UNITS Key The current protocol is displayed Use the ZERO key to scroll between the three protocol choices When the protocol you want is displayed press the UNITS key The choice is accepted and the display shows PROT When finished configuring the scale press the ZERO key which displays DONE then press the UNITS key DIAG is displayed or place Switch 1 back to the closed position to return back to normal weighing mode Model 7821 Bench Scale User s Manual 15 Calibration Mode The Calibration CAL Mode menu allows scale calibration The items in the Calibration menu are as follows Step by Step Instructions for CAL Mode Warning Entering this mode can erase the calibration already saved Special calibration weights are needed to use calibration mode Pounds Kilograms Ib or 1000G Selects the unit of measure of your calibration test weights Scale or Class When calibrating the scale for Ib calibrate the unit as a SCALE or asa CLASS weight
6. alibrating the scale The error codes are broken down into two hexadecimal numbers with each bit defining a single error condition The error codes are defined as follows Most Significant Digit 8 4 2 1 im Reserved for Future Use Least Significant Digit 8421 Calibration error E 01 ROM error E 02 RAM error E 04 Serial EE E 08 PROM error Communication Interface Cable The NCI 7821 scale comes factory configured as a serial RS 232 interface device There is one 9 pin DE type female connector accessible at the rear of the unit The functional pinout of this cable is that of a standard PC which is as follows Model 7821 Bench Scale User s Manual 19 DE 9 Female Scale DE 9 Male Host Pin Name Direction Pin Name _ Direction 1 JMP 1 1 DCD IN 2 TXD OUT 2 RXD IN 3 RXD IN 3 TXD OUT 4 JMP 1 4 DTR OUT 5 SG 5 GRD 6 JMP 1 6 DSR IN 7 JMP2 7 RTS OUT 8 JMP2 8 CTS IN 9 NC 9 RI IN Serial For command response descriptions please Communications refer to the following Weigh Tronix NCI Serial Protocol Communications Documents NCI Standard Protocol 8408 14788 01 W S Z H U M only 8213 Protocol 8408 14788 03 NCI 3835 Protocol 8408 14788 12 NCI This standard is used by all NCI bench scale Communications products Protocol SYMBOL KEY lt ETX gt End of text character 03 hex lt LF gt Line feed chara
7. calibration gravity setting Press the UNITS key The calibration gravity setting is dis played When you are finished press the ZERO key which displays DONE and press the UNITS key DIAG is displayed or place Switch 1 back to the closed position to return back to normal weighing mode Model 7821 Bench Scale User s Manual 13 Configuration Mode Step by Step Instructions for CONF Mode The Configuration CONF Mode menu allows configuration of the scale to the specific applica tion need The items you can configure are as follows Filtering FILT Choose between FAST and SLO filtering Slow should be chosen in areas susceptible to vibration Choose FAST filtering for more stable conditions Baud BAUD Choose a baud and parity from table Protocol PROT Choose serial communi cation protocol NCI Ref 8408 14788 01 W S Z H U M Only 8213 Ref 8408 14788 03 3835 Ref 8408 14788 12 Follow these steps to access and configure the items in the CONF menu Refer to Figure 2 From the normal weighing mode move Switch 1 to Menu Mode or OPEN position then press the ZERO key repeatedly until CONF is displayed Press the UNITS key FILT is displayed This stands for filter ing Press the UNITS key The current setting FAST or SLO is displayed 14 Model 7821 Bench Scale User s Manual 10 10 11 Use the ZERO key to toggle between the two choices Press the
8. classifier postal rounding U On U Off When configured for U ON the scale will allow switching between Ib kg using the UNITS key Capacity 100 etc Selects the capacity of the scale Follow these steps to calibrate the scale Refer to Figure 2 1 From normal weighing mode move Switch 1 to the Menu Mode or OPEN position DIAG is displayed Press the ZERO key until CAL is displayed Press the UNITS key to start calibration LBS or 1000G kg is displayed Press the ZERO key to toggle between the choices of unit of measure Ib or kg When the choice you want is displayed press the UNITS key to accept The choice is accepted and U ON is displayed 16 Model 7821 Bench Scale User s Manual 12 If no span weight is applied calibration will be aborted CAL ERROR ABORT will be displayed 9 Press the ZERO key to toggle between the choices U ON or U OFF Once your choice is displayed press the UNITS key See above for the definitions of calibrating the scale using U ON or U OFF If LB was chosen for calibration the scale will display SCALE Press the ZERO key to toggle between SCALE and CLASS Press the TEST key If kg was chosen this step is skipped The scale then prompts one of the capacities from Table 3 Press the ZERO key to toggle between the capacity choices When the choice you want is displayed press the UNITS key The scale prompts LOAD 0 Clear all weight fr
9. cter OA hex lt CR gt Carriage return character OD hex lt SP gt Space 20 hex x Character from display including minus sign hh Two or more status bytes uu Unit of measure Ib kg oz g etc using ANSI standard abbreviations Model 7821 Bench Scale User s Manual W lt CR gt Scale Response lt LF gt xxxx xxuu lt CR gt lt LF gt hh lt CR gt lt ETX gt Results Returns decimal weight units plus scale status S lt CR gt Scale Response lt LF gt hh lt CR gt lt ETX gt Results Returns scale status Z lt CR gt Scale Response lt LF gt hh lt CR gt lt ETX gt Results Scale is zeroed returns status H lt CR gt Scale Response lt LF gt xxxx xxuu lt CR gt lt LR gt hh lt CR gt lt ETX gt Results Returns decimal weight in 10x with units plus scale status U lt CR gt Scale Response lt LF gt uu lt CR gt lt ETX gt Results Changes unit of measure returns new units M lt CR gt Scale Response lt LF gt xxxxxxxMM lt CR gt lt LF gt hh lt CR gt lt ETX gt Results Returns normalized raw counts and count status All other commands Scale Response lt LF gt lt CR gt lt ETX gt Results Unrecognized command Model 7821 Bench Scale User s Manual 21 Troubleshooting SYMPTOM No Display s Missing or extra segments on display Scale will not return to zero or incorrect weight is displayed Display shows unrecognized characters Display shows u
10. escribed in the section Error Codes If the scale is outside the 10 zero window center dashes are displayed __ _ _ Recalibration may be required 1 With the scale powered on make sure the scale platter is empty and the display is at zero If it not press the ZERO key 0 00 is displayed 2 Place an item to be weighed on the scale platter The scale will display the gross weight 3 Remove the item from the scale platter Modes of Operation Accessing the Menu Figure 1 7821 Switch Location The 7821 powers up in normal weighing mode ready for weighing operations Access the MENU Mode by setting Switch 1 shown in Figure 1 to the OPEN or MENU Mode position Top view of 7821 scale with platter removed A N N A Internal External Keys Gravity Setting Menu 6 Model 7821 Bench Scale User s Manual Zero and Units Key Display Remote Display Gravity Adjustment There are three modes available to you with Switch 1 in the MENU Mode or OPEN position They are as follows Diagnostic Mode Used to test areas of the scale s function Configuration Mode Used to configure the scale for your application Calibration Mode Used when calibrating the scale The structure for these menus is shown in Figure 2 The following pages have specific information about each mode and step by step instructions for accessing them The ZERO key zeros the scale and UN
11. ibrate the scale Remove all weight from the scale Press the ZERO key Power down then power up the scale Recalibrate the scale Check cable connection at both the rear of the scale and the host device Check communication setting and baud rate on both scale and host device Perform I O loopback test Replace main PCB Replace display panel Replace display PCB Replace main PCB Spare Parts List Description Part Number Keyboard Panel 1163 15803 Display PCB 7405 15465 Loadcell 100kg 7154 16335 100 Main PCB 7405 14704 2 Power Supply 1148 15536 RS 232 Cable 1140 13842 Model 7821 Bench Scale User s Manual 23 Notes 24 Model 7821 Bench Scale User s Manual Notes Model 7821 Bench Scale User s Manual 25 26 Model 7821 Bench Scale User s Manual WEIGH TRONIX 1000 Armstrong Drive Fairmont MN 56031 Telephone 507 238 4461 Facsimile 507 238 4195 E Mail service wt nci com www wt nci com
12. ight data is normalized to 100 000 counts of displayed resolution AZT is enabled Typically used by service technicians Division Test w o AZT HRESN Weight data is normalized to 100 000 counts of displayed resolution AZT is disabled Typically used by service technicians 10 Model 7821 Bench Scale User s Manual Step by Step Follow these steps to access the tests in the Instructions for DIAG menu DIAG Mode 1 From normal weighing mode move Switch 1 to the MENU Mode or OPEN position See Figure 1 Display shows DIAG Press the ZERO key to 2 Press the UNITS key scroll through lists of selections DISP is displayed This stands for display Press the UNITS key fo make a selection 3 Press the UNITS key to perform the display i test described earlier If you want to skip a test press the ZERO Display test is performed and the display key to scroll to the shows DISP after the test is completed next test DIAG will flash every 4 Press the ZERO key 10 seconds during the RA is displayed This stands for the RAM high resolution test to test remind you that you are doing a test and not seeing normal 5 Press the UNITS key to perform the RAM weight readings test PASS or FAIL is displayed briefly then DISP f the test fails contact your local Weigh Tronix distributor for service 6 Press the ZERO key to scroll to the ROM test RO is displayed This stands for the ROM test Model 7821 Be
13. nch Scale User s Manual 11 10 11 12 13 14 15 Press the UNITS key to perform the ROM test PASS or FAIL is displayed If the test fails contact your local Weigh Tronix distributor for service Press the ZERO key to scroll to the I O test I O is displayed This stands for the Input Output test With a loopback connector in place press the UNITS key to perform the I O test PASS or FAIL is displayed If the test fails check your connections and or contact your local Weigh Tronix distribu tor for service Press the ZERO key HRESA is displayed This stands for the high resolution test with AZT enabled Press the UNITS key to perform this test The display shows the weight on the scale at a resolution of 100 000 counts Press the UNITS key to stop the test HRESA is displayed Press the ZERO key HRESN is displayed This stands for the high resolution test without AZT enabled Press the UNITS key to perform this test The display shows the weight on the scale at a resolution of 100 000 counts Press UNITS key to stop the test HRESN is displayed Model 7821 Bench Scale User s Manual 16 17 18 19 20 Press the ZERO key LOC G is displayed This stands for local gravity or current gravity setting Press the UNITS key The local or current gravity setting is displayed Press the ZERO key CAL G is displayed This stands for
14. nder dashes indicates the scale is below zero or under capacity RECOMMENDED ACTION Perform each step in sequence until the symp tom is resolved Once the symptom is resolved discontinue the troubleshooting steps and continue with regular product usage 1 Check that the primary side of the cord is plugged into the AC outlet and the second ary side is properly connected to the power jack on the back of the scale 2 Replace power supply 1 Replace display board 1 Press the ZERO key 2 Check for interference of weighing platform 3 Power down then power up the scale 4 Recalibrate the scale 1 Power down then power up the scale 2 Check software PROM for proper insertion 3 Check display cables for the proper connec tion 1 Verify that the weigh platter is on the scale 2 Verify that nothing is interfering with or rubbing against the weighing surface Press the ZERO key 4 Power down then power up the scale 5 Recalibrate the scale 22 Model 7821 Bench Scale User s Manual Display shows center dashes indicates the scale is outside zero capacity of 2 Display shows upper dashes indicates the scale is over capacity Scale is not transmitting data to the host device The ZERO key and TEST key do not function A N a a Verify that the weigh platter is on the scale Press the ZERO key Power down then power up the scale Recal
15. om the scale platter and press the UNITS key After a brief pause LOAD xxx is dis played xxx Span Weight Alternate calibration points can be chosen using the TEST key to toggle between choices see Table 1 Place chosen span calibration weight on the scale and press the UNITS key After a brief pause DONE is displayed The scale then prompts DIAG Remove all calibration weights from scale 10 Return Switch 1 to the closed position The scale returns to normal weighing mode The scale is now tested configured and cali brated It is ready for use in your application Model 7821 Bench Scale User s Manual 17 Gravity Mode Warning Using this feature in sealed applications may be subject to approval by the appropriate governing agency at the end users site Gravity value roles over at 9 8400 and rolls under at 9 7700 18 The Gravity Mode feature provides a means of adjusting the scale s internal calibration factors to compensate for variations in acceleration due to gravity at different geographic locations These differences can cause a given mass to indicate a slightly different weight at an end user s local site than it did at the Calibration CAL site To make the adjustment you must know the value of the gravity constant for the local site This value is expressed in meters per second per second i e m s It is not necessary to calibrate the scale therefo
16. re no calibration weights are needed to make this adjustment The scale maintains two gravity setting values The first is the calibration site value known as CAL G The second is the end user or local site value and is known as LOC G When the scale was originally calibrated at the factory the CAL G and LOC G values were both set to 9 8040 which is the gravity constant for the manufacturing site To adjust the displayed weight value to accu rately reflect an applied test weight you can either recalibrate the scale or adjust the local gravity setting To view the calibration or local gravity values you must access the DIAG menu and scroll to LOC G or CAL G message and press the UNITS key To view or adjust the Local Gravity value set Switch 2 to the OPEN position The display will indicate the current local gravity value Press the ZERO key to increment the value or the UNITS key to decrement the value The gravity value will change in steps of 0002 When the correct value is displayed return Switch 2 to the CLOSED position The scale will now use this new relationship between calibration and local gravity for its weight calculations Model 7821 Bench Scale User s Manual Error Codes Any system errors detected by the scale will be displayed as the letter E followed by a two digit error code Press the UNITS key to continue operation If a calibration error occurs the only way to clear it is by rec
17. remote display only Power Up Test Sequence 1 2 Remove contents of the shipping container Inspect the scale for shipping damage Immediately report any damage to the shipper Mount the scale on a stable level surface that is free from air currents and vibration Be sure the scale platter does not touch any adjacent surfaces To install the scale surface flush with a countertop use these dimensions to guide your construction 7821 Platform Minimum Cutout Dimensions Dimensions 14 35 6cm W x 14 75 37 5cm W x 12 5 31 7cm L 13 25 33 7cm L 4 1 10 4cm Min Ht adjustable to 4 6 11 7cm For the optional remote display attach Velcro fasteners to both the back of the display and to the surface where the display is to be mounted To attach the Velcro fasteners clean the mount ing areas thoroughly and press the Velcro into place The adhesive adheres best to a smooth clean surface Velcro is a registered trademark of Velcro USA Inc When the scale is first powered up it will perform a test sequence During this sequence the display will show the following The model number and software revision level e A numeric counting test for all segments of the display Model 7821 Bench Scale User s Manual 5 Performing a Normal Weighment If everything is OK the display will show zero weight and the scale is ready for use If an error was detected it will be reported by an error code as d
18. span loads Table 1 Alternative Calibration Span Points Alternative Alternative Capacity Calibration Capacity Calibration Ibs Weights lbs kg Weights kg 150 x 05 Ib 10 50 150 60x 02kg 10 30 60 10 30 70 10 30 75 150 x 02 Ib 10 50 150 75x 01 kg 10 30 75 200 x 05 Ib 10 100 200 100 x 02 kg 10 50 100 Table 2 Baud Rate and Parity Options Display Factory Default Setting Model 7821 Bench Scale User s Manual 9 Scale lb kg Table 3 Capacityand Scale Ib kg Capacity and Count by Choices Count by Choices Capacity Ib Capacity kg 150 x 05 60 x 02 150 x 05 70 x 02 150 x 05 75x 02 150 x 02 75 x 01 200 x 05 100 x 02 Diagnostics Mode The Diagnostic DIAG Mode menu lets you test specific areas of the scale s function These areas are Display DISP Shows the version and revision of the software followed by a display segment test RAM RA Performs a nondestructive test of RAM in the processor Displays PASS or FAIL ROM RO Performs a checksum of all locations of ROM in the processor Displays PASS or FAIL Input Output I O Data is output by the scale and through the use of a loopback connector the data is immediately read back into the receive channel and verified against what was sent PASS or FAIL is displayed Requires a jumper short between transmit and receive data lines Division Test w AZT HRESA We
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