NCI 7821 User Manual

Manual is about: Bench Scale Model 7821

Summary of 7821

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    User’s manual model 7821 bench scale.

  • Page 2

    Model 7821 bench scale user’s manual 2 united states this equipment has been tested and found to comply with the limits for a class a digital device, pursuant to part 15 of the fcc rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is op...

  • Page 3: Table of Contents

    Model 7821 bench scale user’s manual 3 table of contents table of contents ..................................................... 3 specifications ........................................................... 4 unpacking and installing the scale .......................... 5 operation .....................

  • Page 4: Specifications

    Model 7821 bench scale user’s manual 4 model #capacity (lb) capacity (kg) divisions 7821-70 150 x .05 lb 60 x .02 kg 3000d 70 x .02 kg 3500d 7821-75 75 x .02 kg 3750d 150 x .02 lb 75 x .01 kg 7500d 7821-100 200 x .05 lb - 4000d 100 x .02 kg 5000d specifications model 7821-70, 7821-75 and 7821-100 us...

  • Page 5: Operation

    Model 7821 bench scale user’s manual 5 1. Remove contents of the shipping container. 2. Inspect the scale for shipping damage. Immediately report any damage to the shipper. 1. Mount the scale on a stable, level surface that is free from air currents and vibration. Be sure the scale platter does not ...

  • Page 6: Modes of Operation

    Model 7821 bench scale user’s manual 6 top view of 7821 scale with platter removed. Modes of operation performing a normal weighment accessing the menu 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 cod...

  • Page 7

    Model 7821 bench scale user’s manual 7 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 – us...

  • Page 8: Figure 2

    Model 7821 bench scale user’s manual 8 figure 2 menu structure.

  • Page 9: Table 1:

    Model 7821 bench scale user’s manual 9 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 span load...

  • Page 10: Diagnostics Mode

    Model 7821 bench scale user’s manual 10 diagnostics mode scale lb/kg capacity and count-by choices table 3: scale lb/kg capacity and count-by choices capacity (lb) capacity (kg) 150 - 1 150 x .05 60 x .02 150 - 2 150 x .05 70 x .02 150 - 3 150 x .05 75 x .02 150 - 4 150 x .02 75 x .01 200 200 x .05 ...

  • Page 11

    Model 7821 bench scale user’s manual 11 follow these steps to access the tests in the diag menu. 1. From normal weighing mode, move switch 1 to the menu mode or open position. (see figure 1). Display shows diag . 2. Press the units key… disp is displayed. This stands for display. 3. Press the units ...

  • Page 12

    Model 7821 bench scale user’s manual 12 7. 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. 8. Press the zero key to scroll to the i/o test… i/o is displayed. This stands for the input/output test. 9. ...

  • Page 13

    Model 7821 bench scale user’s manual 13 16. Press the zero key. . . Loc-g is displayed. This stands for local gravity or current gravity setting. 17. Press the units key. . . The local or current gravity setting is displayed. 18. Press the zero key. . . Cal-g is displayed. This stands for calibratio...

  • Page 14: Configuration Mode

    Model 7821 bench scale user’s manual 14 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 vibrati...

  • Page 15

    Model 7821 bench scale user’s manual 15 11 4. Use the zero key to toggle between the two choices. Press the units key when the choice you want is displayed… the choice is accepted and the display shows filt . 5. Press the zero key… baud is displayed. 6. Press the units key… the current baud and pari...

  • Page 16: Calibration Mode

    Model 7821 bench scale user’s manual 16 the calibration (cal) mode menu allows scale calibration. The items in the calibration menu are as follows: pounds/kilograms (lb or 1000g) – selects the unit of measure of your calibration test weights. Scale or class – when calibrating the scale for lb, calib...

  • Page 17

    Model 7821 bench scale user’s manual 17 if no span weight is applied, calibration will be aborted. “cal error abort” will be displayed. 4. 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...

  • Page 18: Gravity Mode

    Model 7821 bench scale user’s manual 18 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. The gravity mode feature provides a means ...

  • Page 19: Communication

    Model 7821 bench scale user’s manual 19 communication 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 recalibrating the s...

  • Page 20

    Model 7821 bench scale user’s manual 20 serial communications protocol nci communications protocol 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. Jmp ...

  • Page 21

    Model 7821 bench scale user’s manual 21 w scale response xxxx.Xxuu hh... Results returns decimal weight, units, plus scale status s scale response hh… results returns scale status. Z scale response hh… results scale is zeroed, returns status. Hscale response xxxx.Xxuu hh... Results returns decimal w...

  • Page 22: Troubleshooting

    Model 7821 bench scale user’s manual 22 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 out...

  • Page 23: Spare Parts List

    Model 7821 bench scale user’s manual 23 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 1. Verify that the weigh platter is on the scale. 2. Press the zero ...

  • Page 24: Notes

    Model 7821 bench scale user’s manual 24 notes.

  • Page 25: Notes

    Model 7821 bench scale user’s manual 25 notes.

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    Model 7821 bench scale user’s manual 26.

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    Model 7821 bench scale user’s manual 27.

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    1000 armstrong drive fairmont, mn 56031 telephone: 507-238-4461 facsimile: 507-238-4195 e-mail: service@wt-nci.Com www.Wt-nci.Com.