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NCI 7620U User Manual

Bench scale
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Model 7620U
Bench Scale
User's Manual

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Summary of Contents for NCI 7620U

  • Page 1 Model 7620U Bench Scale User’s Manual...
  • Page 2 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. 10/23/03 7620U_U.P65 PN 7424-16232E e1 Printed in USA Model 7620U Bench Scale User’s Manual...

  • Page 3: Table Of Contents

    Diagnostics Mode ..........12 Configuration Mode .......... 15 Calibration Mode ..........17 Gravity Mode ............ 19 Review Scale Settings ........20 Communications ..........21 Error Codes ............23 Troubleshooting ..........24 Spare Parts Listing ........... 27 Model 7620U Bench Scale User’s Manual...

  • Page 4: Specifications

    14" L x 12.5" W x 4.2" H Power Supply UL/CSA and CE approved inline power supply with universal adapter pigtail. Input: 230 VAC + 10% -15% Output: 15 VDC @ .3 Amps Frequency 50 (±3) Hz Standard Model 7620U Bench Scale User’s Manual...
  • Page 5 Access to the calibration switch can be secured with a lead wire or pressure sensitive security seal. The remote and primary indicators have no metrological features that require the use of a security seal. Model 7620U Bench Scale User’s Manual...
  • Page 6 Standard 9-pin pass through RS-232 interface cable included. Not a null modem. RS-232 bidirectional configurable 1200 to 19.2 K baud. Transmits weight and scale status when- ever ASCII “W” <CR> is sent by a remote device. Model 7620U Bench Scale User’s Manual...

  • Page 7: Initial Setup

    4. Make sure all power cords, remote display cables, etc. are not touching the live weighing surface. 5. Plug the unit into an appropriate voltage outlet, properly grounded. Model 7620U Bench Scale User’s Manual...

  • Page 8: Operation

    2. Place an item to be weighed on the scale platter… Reapply power to reset the initial zero The scale will display the gross weight. setting. 3. Remove the item from the scale platter. Model 7620 U Resident Display Model 7620U Bench Scale User’s Manual...
  • Page 9 DECREASE key in the Gravity mode. Remote Display All NCI 7620 bench scales can have an optional remote display (shown above with no keyboard function). If a remote display with keyboard is used, then Switch 3 (shown in Figure 1) determines which display keyboard is functional.
  • Page 10 ZERO key or decrease the value by pressing the F1 key. The structure for these menus is shown in Figure 2. Specific information about each mode and step-by-step instructions for accessing them follow. Model 7620U Bench Scale User’s Manual...

  • Page 11: 7620U Menu Structure

    F1 key to decrease the value. When done, set Switch 2 back to the CLOSED position. Table 1 Capacity Alternate Calibration Weights 5-30 5, 15, 30 kg 6-30 5, 15, 30 kg 6-35 5, 25, 35 kg 5-50 5, 25, 50 kg Model 7620U Bench Scale User’s Manual...

  • Page 12: Diagnostics Mode

    AZT is enabled (Auto Zero Tracking). Division, test w/o / AZT (DIV-N) – Weight data is normalized to 1,000,000 counts of displayed resolution. AZT is disabled. Raw Counts (RA CNTS) – Non-normalized QDT cell data (no zero tracking). Model 7620U Bench Scale User’s Manual...
  • Page 13 “PASS” or “FAIL” is displayed briefly. If the test fails, the unit may have a pro- gram memory failure. Try the test second time, and if “FAIL” is displayed, contact your Weigh-Tronix service provider Model 7620U Bench Scale User’s Manual...
  • Page 14 15. Press the F1 key to stop the test. 16. Press the ZERO key… “RA CNTS” is displayed. This stands for raw counts. 17. Press the F1 key to perform this test… The display shows non normalized cell data. Model 7620U Bench Scale User’s Manual...

  • Page 15: Configuration Mode

    “NCI STD” for standard NCI protocol, “H-100” for 100 times displayed resolution using the “H” command, “7611” for Canada Post- ROSS , or “NCI SMA” for Scale Manufacturers’ Association Standard for Scale Serial Communi- cations. Default is “NCI STD.”...
  • Page 16 Press the F1 key to return to the 9. Press the F1 key… normal weighing mode. The current setting is displayed. Use the ZERO key to toggle between the three choices: “EVEN, ODD, NONE.” Model 7620U Bench Scale User’s Manual...

  • Page 17: Calibration Mode

    Figure 2. Step-by-Step 1. From normal weighing mode, move Instructions for Switch1 to the Menu Mode or OPEN posi- CAL Mode tion… “DIAG” is displayed. Press the ZERO key until “CAL” is displayed. Model 7620U Bench Scale User’s Manual...

  • Page 18: Zero Key

    7. Return Switch 1 to the closed position… The scale returns to normal weighing mode. Close Switch-1 if you The scale is now tested, configured and cali- don’t have correct brated. It is ready for use in your application. calibration weights. Model 7620U Bench Scale User’s Manual...

  • Page 19: Gravity Mode

    .0001. When the correct value is dis- played, simply return Switch 2 to the CLOSED position. The scale will now use this new relation- ship between calibration and local gravity for its weight calculations. Model 7620U Bench Scale User’s Manual...

  • Page 20: Review Scale Settings

    Press the F1 key to select the displayed item to view. When finished viewing the settings, press the ZERO key until “DONE” is displayed. Then press the F1 key to return to normal weighing mode of operation. Model 7620U Bench Scale User’s Manual...

  • Page 21: Communications

    Communications The NCI 7620U 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 the scale connector and a standard host PC is as follows:...
  • Page 22 Returns decimal weight in 10X with units and scale status Raw Counts M<CR> Scale Response <LF>xxxxxxxMM<CR> <LF>hhh <CR><ETX> Returns normalized normalized raw counts and count status All other commands Scale Response <LF>?<CR><ETX> Unrecognized command Model 7620U Bench Scale User’s Manual...

  • Page 23: Error Codes

    H-100 Communications The H-100 communications protocol is the same Protocol as NCI STD serial communications protocol with the following exceptions: The “H” command is The H<CR> command returns decimal weight at to be used for non- 100X the displayed resolution along with units type approved and scale status.

  • Page 24: Troubleshooting

    2. Replace the power supply. 3. Replace the display board. 4. Replace the I/O board. 5. Replace the QDT load cell. Missing or extra segments on display 1. Replace the display board. 2. Replace the QDT load cell. Model 7620U Bench Scale User’s Manual...
  • Page 25 1. Verify that weigh platter is on the scale. 2. Press the ZERO key. 3. Power off, remove any items from the platter, and then power on the scale. 4. Recalibrate the scale. 5. Replace the QDT load cell. Model 7620U Bench Scale User’s Manual...
  • Page 26 2. Open display enclosure and verify that the keypad cable is still installed correctly. 3. Replace the display panel. 4. Replace the display PCB. 5. Replace the display cable. 6. Replace the I/O PCB. 7. Replace the QDT load cell. Model 7620U Bench Scale User’s Manual...

  • Page 27: Spare Parts Listing

    Load Cell 32 kg (5-30, 6-30, 6-35) 7153-15694-23 Load Cell 50 Kg (5-50) 7153-15694-50 Shroud ABS Plastic 1076-15256 Shroud SS 1076-15767 Feet 7075-15475-02 European Power Cord 1140-15833-01 UK Power Cord 1140-00246 Power Supply 115 VAC 1148-15536 Model 7620U Bench Scale User’s Manual...
  • Page 28 Notes Model 7620U Bench Scale User’s Manual...
  • Page 29 Notes Model 7620U Bench Scale User’s Manual...
  • Page 30 Notes Model 7620U Bench Scale User’s Manual...
  • Page 31 Model 7620U Bench Scale User’s Manual...
  • Page 32 1000 Armstrong Drive Fairmont, MN 56031 Telephone: 507-238-4461 Facsimile: 507-238-4195 E-Mail: service@wt-nci.com www.wt-nci.com...

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