How it Works
Salter Brecknell
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7840
User Manual
40 pgs1.78 Mb0

Salter Brecknell 7840 User Manual

Model 7800 Family
Weight
7820
7880
Classifiers
User’s
Manual
7885
7829
7840
7824
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.
10/10/05 7800_U.P65 PN 7424-15170i e2 Printed in USA
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Table of Contents
Specifications ....................................................................... 4
Initial Setup .......................................................................... 7
Operation ............................................................................. 9
Diagnostics Mode ............................................................... 15
Configuration Mode ............................................................ 20
Calibration Mode ................................................................ 24
Gravity Mode ...................................................................... 27
Re-Calibration Mode .......................................................... 28
Review/Test Scale Settings ................................................ 29
Communication .................................................................. 31
Error Codes ........................................................................ 34
Troubleshooting ................................................................. 35
Spare Parts Listing ............................................................. 37
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Specifications
Description
Capacity/Resolution
Agency
Certificates
of Conformance
The NCI 7800 models are digital electronic parcel bench scales specifically designed for shipping applications and are Legal-for-Trade. The scales have built-in intelligence that enables them to be easily interfaced with a computer or other data­processing device.
Model Capacity (lb) Capacity (kg) n(max)
7820-50 100 x 0.02 lb 50 x 0.01 kg 5000d 7820-70 150 x 0.05 lb 60 x 0.02 kg 3000d 7820-75 150 x 0.02 lb 75 x 0.01 kg 7500d
7880-50 100 X 0.02 lb 50 x 0.01 kg 5000d 7880-75 150 x 0.05 lb 75 x 0.02 kg 3750d 7880-125 250 x 0.05 lb 100 x 0.02 kg 5000d 7880-150 300 x 0.1 lb 150 x 0.05 kg 3000d
7885-75 150 x 0.05 lb 75 x 0.02 kg 3750d
7829-125 250 x 0.05 lb 100 x 0.02 kg 5000d
7840-125 250 x 0.05 lb 100 x 0.02 kg 5000d 7840-150 300 x 0.1 lb 150 x 0.05 kg 3000d
7824-125 250 x 0.05 lb 100 x 0.02 kg 5000d 7824-150 300 x 0.1 lb 150 x 0.05 kg 3000d
Model 7820
United States: NTEP #95-070 Canada: Ministry of Industry #AM-5076 For use as a Class III device from +5°C through +40°C
If unit is to be used as a commercial device, all local reporting and registration requirements must be fol­lowed.
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Model 7885
United States: NTEP #02-069 Canada: Ministry of Industry (#AM-5507) For use as a Class III device from +5°C through +40°C
Models 7824, 7829, 7840, 7880
United States: NTEP #95-121 Canada: Ministry of Industry #AM-5099 For use as a Class III device from +5°C through +40°C
Dimensions
Model 7820: 14" L x 12.5" W x 4.1" H Model 7880: 18" L x 18" W x 4.6" H Model 7885: 18" L x 18" W x 3.0" H Model 7829: 20" L x 20" W x 5.3" H Model 7840: 18" L x 24" W x 4.6" H Model 7824: 24" L x 24" W x 4.6" H
Power Supply
Frequency
Power Requirements
Operating Temperature
Construction
UL/CSA approved in-line power supply with 6’ line cord. (7885 uses wallmount style) Input: 120 VAC +10%-15%, Standard 3 wire w/
ground
Output: 15 VDC @.3 Amps DC
60 Hz Standard
0.1 amp maximum
42ºF – 104ºF (5ºC – 40ºC) 10% to 95% RH (non-condensing)
Model 7820: Die cast aluminum base with a stainless steel weigh platter. Overload protection: Adjustable center stop, fixed corner stops.
Model 7885: Painted mild steel base with stainless steel weigh platter. Overload protection: Fixed center and corner stops.
Models 7824, 7829, 7840, 7880: Painted mild steel base with stainless steel weigh platter. Overload protection: Adjustable center and corner stops.
Display
½" high, six-digit LCD. Internal display standard on all models except 7885 (remote only) Key panel with ZERO and TEST keys. Optional remote display with 7 ft. cable.
Scale Leveling
Level bubble located under weigh platter. Adjust­able feet in each corner to level the scale.
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Zero Window
Initial automatic zero setting is ±10% of maxi­mum capacity—active at power up. Manual zero setting range is ±2% of maximum capacity— active using the ZERO key.
Under Capacity Limits
Over Capacity Limits
Sealing
Internal Counts
Under capacity indication will be given with dashes appearing on the bottom line of the display whenever the display is more than 2 percent below the initial zero value.
Over capacity indication will be given with dashes appearing in the upper line of the display when­ever the weighed item exceeds 9 divisions over the rated capacity of the unit. The scale will use the Initial zero value for reference for over capacity determination.
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.
The scale has 100,000 internal counts.
Dynamic Response
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The time from when weight is applied to the scale until a stable weight display is displayed:
0–1000d 1.5 seconds 1000d+ 2.0 seconds
maximum mean average
Communications
Initial Setup
Factory default settings: 9600 baud, 7 data bits, even parity, 1 stop bit.
Standard 9-pin pass through RS-232 interface cable included. Not a null modem.
RS-232 bidirectional, configurable 1200 to 19.2K baud. Transmits weight and scale status when­ever ASCII “W” <CR> is sent by a remote device.
Unpacking the Scale
Installing the Scale
1. Remove contents of the shipping container.
2. Inspect the scale for evidence of 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 touch any adjacent surfaces.
2. To install the scale surface flush with a countertop, use the dimensions on the following page to guide construction.
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Model 7820
Scale Dimensions Min. Cut-Out Dimensions D 12.5 in. (31.7 cm) 13.25 in. (33.7 cm) W 14 in. (35.6 cm) 14.75 in. (37.5 cm) H 4.1 in. (10.4 cm)*
*Adjustable to 4.6 in. (11.7 cm)
Model 7880
Model 7885
Model 7829
Model 7840
Model 7824
Scale Dimensions Min. Cut-Out Dimensions D 18 in. (45.7 cm) 18.75 in. (47.6 cm) W 18 in. (45.7 cm) 18.75 in. (47.6 cm) H 4.6 in. (11.6 cm)*
*Adjustable to 5.1 in. (12.9 cm)
Scale Dimensions Min. Cut-Out Dimensions D 18 in. (45.7 cm) 18.75 in. (47.6 cm) W 18 in. (45.7 cm) 18.75 in. (47.6 cm) H 3.0 in. (7.6 cm)*
*Adjustable to 3.5 in. (8.9 cm)
Scale Dimensions Min. Cut-Out Dimensions D 20 in. (50.8 cm) 20.75 in. (52.7 cm) W 20 in. (20.8 cm) 20.75 in. (52.7 cm) H 5.3 in. (13.5 cm)*
*Adjustable to 5.8 in. (14.7 cm)
Scale Dimensions Min. Cut-Out Dimensions D 24 in. (61.0 cm) 24.75 in. (62.9 cm) W 18 in. (45.7 cm) 18.75 in. (47.6 cm) H 4.6 in. (11.7 cm)*
*Adjustable to 5.1 in. (12.9 cm)
Scale Dimensions Min. Cut-Out Dimensions D 24 in. (61.0 cm) 24.75 in. (62.9 cm) W 24 in. (61.0 cm) 24.75 in. (62.9 cm) H 4.6 in. (11.7 cm)*
*Adjustable to 5.1 in. (12.9 cm)
3. Loosen the collars or jam nuts on the leveling feet. Level the scale by using the level bubble under the scale platter as a guide. Be sure all four feet are in firm contact with the counter, then tighten all collars and jam nuts.
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 that is properly grounded.
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Operation
Power Up Test Sequence
If RAM or ROM error is reported, you must press the TEST key to acknowledge the condition. See Error Codes section.
Performing a Normal Weighment
When first powered on, if the scale is outside the ± 10% zero window, center dashes are displayed. “- - - -” If necessary, reapply power to reset the initial zero setting. Refer to the Trouble- shooting section if the problem persists.
When the scale is first powered on, it will perform a test sequence. During this sequence, the display will show the following:
• The model number and the software revision level.
• A numeric counting test for all segments of the display. During this test, a test of Random Access Memory (RAM) and a test of Read Only Memory (ROM) is performed.
If everything is OK, the display will show zero weight and the scale is ready for use.
1. With the scale powered on, make sure the scale platter is empty and the display is at zero. If it is 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.
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7820, 7880, 7829, 7840 and 7824 resident display
Operation Controls
7885 or Optional
Remote Display
ZERO Key – The ZERO key will zero the scale if weight is stable, and acts as the NO or SCROLL key in the Menu Mode and as the INCREASE key in the Gravity Mode.
TEST Key – The TEST key can be used to perform the initial power-up test sequence, recall diagnostic routines, or view the configuration information. This key also functions as YES or ACCEPT in the Menu Mode and as the DE­CREASE key in the Gravity Mode.
All NCI 7800 bench scales, except the 7885, can have an optional remote display. If a remote display with keyboard is used, then Switch 3 (shown in Figure 1) determines which display keyboard is funcitional.
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Switch 3 Settings: Closed= internal display keys operational Open= external display keys operational
The remote display must be connected to the RJ45 port (DISPLAY) prior to power up to operate properly.
Accessing the Menu Mode
The 7800 models power up ready for weighing operations. Access the Menu mode by setting Switch 1 shown in Figure 1 or 2 to the OPEN or Menu mode position.
Accessing the Gravity Mode
Figure 1
7820 Switch Location
Access the Gravity setting mode by setting Switch 2, shown in Figure 1 or 2, to the OPEN or Gravity mode position.
Top View of 7820 Scale with Platter Removed
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Figure 2
7824, 7829, 7840, 7880, 7885 Switch Location
Bottom View of Models 7824, 7829, 7840,
7880 and 7885
Menu Mode
Gravity Mode
With Switch 1 in the Menu mode or OPEN position, there are four modes available to you. They are as follows:
DIAG (Diagnostic Mode) – To test areas of the scale’s function
CONF (Configuration Mode) – To configure the scale for your application
CAL (Calibration Mode) – To calibrate the scale
RE-CAL (Recalibration Mode) – To change resolution and rounding type
The structure for these menus is shown in Figure
3. Specific information about each mode followed by step-by-step instructions for accessing them are described in the following pages.
With Switch 2 in the Gravity Mode or OPEN position, you may increase the local gravity value by pressing the ZERO key, or decrease the value by pressing the TEST key.
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