NCI 7800 User manual

User’s
Manual
Model
7800
Family
Weight
Classifiers
7880
7820
7829
7824
7840
7885

Model 7800 Family Weight Classifiers User’s Manual
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.
CAUTION
10/10/05 7800_U.P65 PN 7424-15170i e2 Printed in USA

Model 7800 Family Weight Classifiers User’s Manual 3
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

Model 7800 Family Weight Classifiers User’s Manual
4
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 data-
processing 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
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
Specifications
Description
Capacity/Resolution
Agency
Certificates
of Conformance
If unit is to be
used as a
commercial
device, all local
reporting and
registration
requirements
must be fol-
lowed.

Model 7800 Family Weight Classifiers User’s Manual 5
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
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.
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.
Level bubble located under weigh platter. Adjust-
able feet in each corner to level the scale.
Dimensions
Power Supply
Frequency
Power Requirements
Operating Temperature
Construction
Display
Scale Leveling

Model 7800 Family Weight Classifiers User’s Manual
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Zero Window
Under Capacity Limits
Over Capacity Limits
Sealing
Internal Counts
Dynamic Response
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.
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 when-
ever 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.
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

Model 7800 Family Weight Classifiers User’s Manual 7
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 when-
ever ASCII “W” <CR> is sent by a remote device.
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.
Communications
Unpacking the Scale
Installing the Scale

Model 7800 Family Weight Classifiers User’s Manual
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Scale Dimensions Min. Cut-Out Dimensions
D12.5 in. (31.7 cm) 13.25 in. (33.7 cm)
W14 in. (35.6 cm) 14.75 in. (37.5 cm)
H4.1 in. (10.4 cm)*
*Adjustable to 4.6 in. (11.7 cm)
Scale Dimensions Min. Cut-Out Dimensions
D18 in. (45.7 cm) 18.75 in. (47.6 cm)
W18 in. (45.7 cm) 18.75 in. (47.6 cm)
H4.6 in. (11.6 cm)*
*Adjustable to 5.1 in. (12.9 cm)
Scale Dimensions Min. Cut-Out Dimensions
D18 in. (45.7 cm) 18.75 in. (47.6 cm)
W18 in. (45.7 cm) 18.75 in. (47.6 cm)
H3.0 in. (7.6 cm)*
*Adjustable to 3.5 in. (8.9 cm)
Scale Dimensions Min. Cut-Out Dimensions
D20 in. (50.8 cm) 20.75 in. (52.7 cm)
W20 in. (20.8 cm) 20.75 in. (52.7 cm)
H5.3 in. (13.5 cm)*
*Adjustable to 5.8 in. (14.7 cm)
Scale Dimensions Min. Cut-Out Dimensions
D24 in. (61.0 cm) 24.75 in. (62.9 cm)
W18 in. (45.7 cm) 18.75 in. (47.6 cm)
H4.6 in. (11.7 cm)*
*Adjustable to 5.1 in. (12.9 cm)
Scale Dimensions Min. Cut-Out Dimensions
D24 in. (61.0 cm) 24.75 in. (62.9 cm)
W24 in. (61.0 cm) 24.75 in. (62.9 cm)
H4.6 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 weigh-
ing surface.
5. Plug the unit into an appropriate voltage
outlet that is properly grounded.
Model 7820
Model 7880
Model 7829
Model 7840
Model 7824
Model 7885

Model 7800 Family Weight Classifiers User’s Manual 9
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.
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.

Model 7800 Family Weight Classifiers User’s Manual
10
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 DE-
CREASE 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.
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.
7820, 7880, 7829, 7840 and 7824 resident display