1. Manuals
  2. Brands
  3. NCI Manuals
  4. Scales
  5. 7821
  6. User manual

NCI 7821 User Manual

Bench scale model 7821
Hide thumbs
Table of Contents

Advertisement

Quick Links

Model 7821
Bench Scale
User's Manual

Advertisement

Table of Contents
loading

Related Manuals for NCI 7821

Summary of Contents for NCI 7821

  • Page 1 Model 7821 Bench Scale User’s Manual...
  • Page 2 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 Model 7821 Bench Scale User’s Manual...

  • Page 3: Table Of Contents

    Modes of Operation ..........6 Diagnostics Mode ........... 10 Configuration Mode ..........14 Calibration Mode ............ 16 Gravity Mode ............18 Error Codes ............19 Communication ............19 Troubleshooting ............. 22 Spare Parts List............23 Model 7821 Bench Scale User’s Manual...

  • Page 4: Specifications

    Manual zero setting range is ± 2% of maximum capacity—active using the ZERO key. Transformer Voltage Input: 120 VAC +10%, -15% Standard 3 wire w/ground Output: 15 VDC @.3 Amps DC minimum Frequency 60 Hz Standard Power Requirements 0.1 Amp maximum Model 7821 Bench Scale User’s Manual...

  • Page 5: Unpacking And Installing The Scale

    When the scale is first powered up, it will perform Test Sequence a test sequence. During this sequence, the display will show the following: • The model number and software revision level • A numeric counting test for all segments of the display Model 7821 Bench Scale User’s Manual...

  • Page 6: Modes Of Operation

    3. Remove the item from the scale platter. Modes of Operation Accessing the Menu 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.
  • Page 7 Display Remote Display 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...

  • Page 8: Menu Structure

    Figure 2 Menu Structure Model 7821 Bench Scale User’s Manual...
  • Page 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 loads.

  • Page 10: Diagnostics Mode

    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. Model 7821 Bench Scale User’s Manual...
  • Page 11 PASS or FAIL is displayed briefly, then DISP. If 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 Bench Scale User’s Manual...
  • Page 12 14. Press the UNITS key to perform this test… The display shows the weight on the scale at a resolution of 100,000 counts. 15. Press UNITS key to stop the test… HRESN is displayed. Model 7821 Bench Scale User’s Manual...
  • Page 13 20. 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...

  • Page 14: Configuration Mode

    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 Step-by-Step...
  • Page 15 11. 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...

  • Page 16: Calibration Mode

    Special UNITS key to accept… calibration weights are The choice is accepted and U ON is needed to use displayed. calibration mode. Model 7821 Bench Scale User’s Manual...
  • Page 17 9. 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...

  • Page 18: Gravity Mode

    .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...

  • Page 19: Error Codes

    The error codes are defined as follows: 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...
  • Page 20 Communications Documents: Protocol NCI Standard Protocol: 8408-14788-01 (W, S, Z, H, U, M only) 8213 Protocol: 8408-14788-03 NCI 3835 Protocol: 8408-14788-12 This standard is used by all NCI bench scale Communications products. Protocol SYMBOL KEY: <ETX> End of text character (03/hex) <LF>...
  • Page 21 U<CR> Scale Response <LF>uu<CR><ETX> Results Changes unit of measure, returns new units. M<CR> Scale Response <LF>xxxxxxxMM<CR> <LF>hh...<CR><ETX> Results Returns normalized raw counts and count status. All other commands Scale Response <LF>?<CR><ETX> Results Unrecognized command Model 7821 Bench Scale User’s Manual...

  • Page 22: Troubleshooting

    2. Verify that nothing is interfering with or (indicates the scale is rubbing against the weighing surface. below zero or under capacity). 3. Press the ZERO key 4. Power down, then power up the scale. 5. Recalibrate the scale. Model 7821 Bench Scale User’s Manual...

  • Page 23: Spare Parts List

    2. Replace display PCB. 3. 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...
  • Page 24 Notes Model 7821 Bench Scale User’s Manual...
  • Page 25 Notes Model 7821 Bench Scale User’s Manual...
  • Page 26 Model 7821 Bench Scale User’s Manual...
  • Page 27 Model 7821 Bench Scale User’s Manual...
  • Page 28 1000 Armstrong Drive Fairmont, MN 56031 Telephone: 507-238-4461 Facsimile: 507-238-4195 E-Mail: service@wt-nci.com www.wt-nci.com...

Table of Contents