Avery Weigh-Tronix 7821 User Instructions
Model 7821
User Instructions
AWT35-501542
Issue AA
Avery Weigh-Tronix is a trademark of the Illinois Tool Works group of companies whose ultimate parent company is
Illinois Tool Works Inc (“Illinois Tool Works”). Copyright © 2016 Illinois Tool Works. All rights reserved.
No part of this publication may be reproduced by making a facsimile copy, by the making of a copy in three dimensions of a two-dimensional
work and the making of a copy in two dimensions of a three-dimensional work, stored in any medium by electronic means, or transmitted in
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copyright owner, under license, or as permitted by law.
This publication was correct at the time of going to print, however Avery Weigh-Tronix reserves the right to alter without notice the
specification, design, price or conditions of supply of any product or service at any time.
7821_u_en_501542.book
Table of Contents
page
Table of Contents ...................................................................................................................................... 3
Chapter 1 General information and warnings ......................................................................................... 5
About this manual ..............................................................................................................5
Text conventions ......................................................................................................... 5
Special messages ....................................................................................................... 5
Installation .......................................................................................................................... 6
Electrical installation .......................................................................................................... 6
Pluggable equipment ................................................................................................... 6
Wet conditions ............................................................................................................. 6
Routine maintenance ......................................................................................................... 7
Cleaning the machine ........................................................................................................ 7
Training .............................................................................................................................. 7
FCC and EMC declarations of compliance ........................................................................ 8
Chapter 2 Specifications ........................................................................................................................... 9
Chapter 3 Unpacking and Installing the Scale ...................................................................................... 10
Chapter 4 Operation ................................................................................................................................ 11
Power Up Test Sequence ................................................................................................ 11
Performing a Normal Weighment ..................................................................................... 11
Chapter 5 Modes of Operation ............................................................................................................... 12
Accessing the Menu ......................................................................................................... 12
Zero and Units Key .................................................................................................... 12
Display ....................................................................................................................... 13
Remote Display ......................................................................................................... 13
Gravity Adjustment ........................................................................................................... 13
Alternative Calibration Span Points ........................................................................... 15
Baud Rate and Parity Options ................................................................................... 15
Scale lb/kg Capacity and Count-by Choices ............................................................. 16
Diagnostics Mode ............................................................................................................ 16
Step-by-Step Instructions for DIAG Mode ................................................................. 17
Configuration Mode .......................................................................................................... 19
Step-by-Step Instructions for CONF Mode ................................................................ 19
Calibration Mode .............................................................................................................. 20
Step-by-Step Instructions for CAL Mode ................................................................... 20
Gravity Mode .................................................................................................................... 22
Chapter 6 Communication ...................................................................................................................... 23
Interface Cable ................................................................................................................. 23
Serial Communications Protocol ...................................................................................... 24
NCI Communications Protocol ......................................................................................... 25
Chapter 7 Error Codes and Troubleshooting ........................................................................................ 27
Troubleshooting ............................................................................................................... 28
Chapter 8 Spare parts ............................................................................................................................. 30
7821 User Instructions 3
4 7821 User Instructions
1 General information and warnings
1.1 About this manual
This manual is divided into chapters by the chapter number and the large text at the top
of a page. Subsections are labeled as shown by the 1.1 and 1.1.1 headings. The
names of the chapter and the next subsection level appear at the top of alternating
pages of the manual to remind you of where you are in the manual. The manual name
and page numbers appear at the bottom of the pages.
1.1.1 Text conventions
Key names are shown in bold and reflect the case of the key being described. This
applies to hard keys and on-screen or soft keys.
Displayed messages appear in bold italic type and reflect the case of the displayed
message.
1.1 About this manual
1.1.2 Special messages
Examples of special messages you will see in this manual are defined below. The
heading words have specific meanings to alert you to additional information or the
relative level of hazard.
ELECTRICAL WARNING!
THIS IS AN ELECTRICAL WARNING SYMBOL.
ELECTRICAL WARNINGS MEAN THAT FAILURE TO FOLLOW
SPECIFIC PRACTICES OR PROCEDURES MAY RESULT IN
ELECTROCUTION, ARC BURNS, EXPLOSIONS OR OTHER HAZARDS
THAT MAY CAUSE INJURY OR DEATH.
CAUTION!
This is a Caution symbol.
Cautions give information about procedures that, if not observed, could result
in damage to equipment or corruption to and loss of data.
NOTE: This is a Note symbol. Notes give additional and important information, hints
and tips that help you to use your product.
7821 User Instructions 5
General information and warnings
1.2 Installation
DANGER: RISK OF ELECTRICAL SHOCK. NO USER SERVICEABLE
PARTS. REFER TO QUALIFIED SERVICE PERSONNEL FOR SERVICE.
CAUTION: Installation, configuration, and servicing are only to be done by
qualified service personnel as authorized by Avery Weigh-Tronix.
1.3 Electrical installation
CAUTION: The socket-outlet shall be installed near the equipment and shall
be easily accessible.
The electrical supply must have a circuit breaker with an appropriate rating to
protect from over-current conditions.
For your protection, all electrical (110V or 230V) equipment used out of doors
or in wet or damp conditions should be supplied from a correctly fused power
source and protected by an approved ground fault protection device (RCD,
GFCI etc.)
IF IN DOUBT SEEK ADVICE FROM A QUALIFIED ELECTRICIAN.
1.3.1 Pluggable equipment
Pluggable equipment must be installed near an easily accessible socket outlet.
1.3.2 Wet conditions
Under wet conditions, the plug must be connected to the final branch circuit via an
appropriate socket / receptacle designed for washdown use.
Installations within the USA should use a cover that meets NEMA 3R specifications
as required by the National Electrical Code under section 410-57. This allows the unit
to be plugged in with a rain tight cover fitted over the plug.
Installations within Europe must use a socket which provides a minimum of IP56
protection to the plug / cable assembly. Care must be taken to make sure that the
degree of protection provided by the socket is suitable for the environment.
6 7821 User Instructions
1.4 Routine maintenance
IMPORTANT: This equipment must be routinely checked for proper operation
and calibration.
Application and usage will determine the frequency of calibration required for
safe operation.
Always turn off the machine and isolate from the power supply before starting any
routine maintenance to avoid the possibility of electric shock.
1.5 Cleaning the machine
Table 1.1 Cleaning DOs and DON’Ts
1.4 Routine maintenance
DO DO NOT
1.6 Training
Wipe down the outside of
standard products with a
clean cloth, moistened with
water and a small amount of
mild detergent
Spray the cloth when using a
proprietary cleaning fluid
Do not attempt to operate or complete any procedure on a machine unless you have
received the appropriate training or read the instruction books.
To avoid the risk of RSI (Repetitive Strain Injury), place the machine on a surface which
is ergonomically satisfactory to the user. Take frequent breaks during prolonged usage.
Attempt to clean the inside of
the machine
Use harsh abrasives,
solvents, scouring cleaners
or alkaline cleaning solutions
Spray any liquid directly on to
the display windows
7821 User Instructions 7
General information and warnings
1.7 FCC and EMC declarations of compliance
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 operated in a
commercial environment. This equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the instruction manual, may cause
harmful interference to radio communications. Operation of this equipment in a residential
area is likely to cause harmful interference in which case the user will be required to correct
the interference at his own expense.
Canada
This digital apparatus does not exceed the Class A limits for radio noise emissions from
digital apparatus set out in the Radio Interference Regulations of the Canadian Department
of Communications.
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites
applicables aux appareils numériques de la Classe A prescrites dans le Règlement sur le
brouillage radioélectrique edicté par le ministère des Communications du Canada.
European Countries
WARNING: This is a Class A product. In a domestic environment, this product may cause
radio interference in which the user may be required to take adequate measures.
8 7821 User Instructions
2 Specifications
Capacity/Resolution
Model Capacity (lb) Capacity (kg) Divisions
7821-70 150 x 0.05 lb
7821-75 150 x 0.02 lb
7821-100 200 x 0.05 lb
60 x 0.02 kg
70 x 0.02 kg
75 x 0.02 kg
75 x 0.01 kg
-
100 x 0.02 kg
3000d
3500d
3750d
7500d
4000d
5000d
Approvals
Model 7821-70, 7821-75 and 7821-100
USA: NTEP COC #95-070
Canada: Ministry of Industry #AM5076
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.
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
7821 User Instructions 9
Unpacking and Installing the Scale
3 Unpacking and Installing the Scale
Unpacking 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.
Installing the Scale
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.
Cutout Dimensions
To install the scale surface flush with a countertop, use these dimensions to guide your
construction:
7821 Platform Minimum Cutout
Dimensions
14" (35.6cm) W x 14.75" (37.5cm) W x
12.5" (31.7cm) L 13.25" (33.7cm) L
4.1" (10.4cm) Min Ht.
adjustable to 4.6" (11.7cm)
Dimensions
Attaching VelcroTM Fasteners (optional)
For the optional remote display, attach Velcro™ fasteners to both the back of the
display and to the surface where the display is to be mounted. To attach the Velcro
fasteners, clean the mounting areas thoroughly and press the Velcro into place. The
adhesive adheres best to a smooth, clean surface.
Velcro is a registered trademark of Velcro USA, Inc.
10 Product Name Manual Type
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