Cardinal CN20 User manual

Cardinal®

CN20 Series

Weight Indicating

Instruments

Technical Manual

8534-M514-O1 Rev B
5/98

Cardinal Scale Mfg. Co.

PO BOX 151 • WEBB CITY, MO 64870

417-673-4631 Fax: [phone]

Printed in USA

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CN20 Digital Weight

TABLE OF CONTENTS

Indicating Instrument

Congratulations on your purchase of a series
CN20 Digital Weight Indicating Instrument. This
instrument, which has been designed and
manufactured in the U.S.A., incorporates the
latest digital technology and includes features
that were unavailable only a shor t time ago. With
reasonable care your CN20 should provide years
of accurate weight measurements.

The series CN20 is housed in an
injection-molded polycarbonate enclosure and
may be mounted on a scale column or on a wall
or desktop. The instrument is available with
either a red LED display or a high-contrast LCD
display. Although the basic weight indicating
instrument is designed to operate from batteries,
optional plug-in power supplies are available for
115 VAC or 230 VAC.

SPECIFICATIONS .......................................1

INSTALLATION ............................................1

Power Supply .....................................2

Batteries .............................................2

Load Cell Connection.........................3

SETUP AND CALIBRATION........................3

FINE SPAN ..................................................8

KEYPAD FUNCTIONS.................................8

ANNUNCIATORS.........................................9

SETUP REVIEW..........................................10

BATTERY CHARGING.................................11

PRINTED CIRCUIT BOARD

JUMPER TABLE ..........................................11

ERROR & STATUS DISPLAY ......................11

CARE AND CLEANING ...............................12

BEFORE YOU CALL FOR

SERVICE ...................................................12

APPENDIX A

Replacement Part ID List ...................13

The CN20 keyboard allows the operator to lock
the weight display as well as review and change
operational parameters including sample rate,
filtering, auto shutoff and sleep mode.

This manual is provided to serve as your guide to
the installation, operation and maintenance of
your new weight indicating instrument. Please
take the time to read this manual before
attempting to install or operate your CN20.

FCC COMPLIANCE STATEMENT
WARNING! This equipment generates, uses and
can radiate radio frequency energy and if not
installed and used in accordance with the
instructions in this manual, may cause
interference to radio communications. It has been
tested and found to comply with the limits for a
Class A computing device pursuant to Subpart J
of Part 15 of FCC Rules, which are designed to
provide reasonable protection against such
interference when operated in a commercial
environment. Operation of this equipment in a
residential area is likely to cause interference in
which case the user, at his own expense, will be
required to take whatever measures may be
required to correct the interference.

All rights reserved. Reproduction or use, without express
permission, of editorial or pictorial content, in any manner,
is prohibited. No patent liability is assumed with respect to
the use of the information contained herein. While every
precaution has been taken in the preparation of this book,
we assume no responsibility for errors or omissions.
Neither is any liability assumed for damages resulting from
the use of the information contained herein. All instructions
and diagrams have been checked for accuracy and ease
of application; however, success and safety in working
with tools depend to a great extent upon the individual
accuracy, skill and caution. For this reason, we are not
able to guarantee the result of any procedure contained
herein. Nor can we assume responsibility for damage to
property or injury to persons occasioned from the
procedures. Persons engaging the procedures do so
entirely at their own risk.

PRECAUTIONS

Before using this instrument, read this
manual and pay special attention to all
“WARNING” symbols:

IMPORTANT ELECTRICAL

WARNING

SERIAL NUMBER

You may find the booklet “How to Identify and
Resolve Radio TV Interference Problems” prepared
by the Federal Communications Commission helpful.
It is available from the U.S. Government Printing
Office, Washington, D.C. 20402. Stock No.
001-000-00315-4.

DATE OF PURCHASE
PURCHASED FROM

RETAIN THIS INFORMATION FOR FUTURE USE

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SPECIFICATIONS

Power Requirements: 12 VDC, 300ma Optional Power Supply
Operating Temperature: 14°F (-10°C) to 104°F (40°C)
Display: 4 ea. 0.7" 7-Segment High-Contrast LCD (CN20L)

or: 0.56" 7-Segment Red LED (CN20E)

Sensitivity: 1.5 uV/Graduation (0 - 3 mV/V input)
Load Cell Excitation: 5.0 VDC
Maximum Load Cell Cable Length: 30'
Capacities: 1,000 - 9,999 Displayed Graduations
Resolution: 1 part in 9,999 Displayed

1 part in 40,000 Internal

Graduation Value: 1, 2 or 5 x 1, .1, .01, .001
Sample Rate: 1 - 12 Samples Per Second Selectable
Auto Zero Range: 0.5, 1 or 3 Graduations
Manual Zero Range: 4% Capacity or Full Capacity
Weight: (Without Batteries) 1.3 lb (.06 kg)

(With Batteries) 3.2 lb (1.5 kg)
Dimensions: 9 1/8" W x 5" H x 3" D
Sleep Mode: Selectable power save mode with automatic activation from 1

- 9 minutes if at zero without motion.

Options: AC Plug-in Power Modules for Operation from either 115

VAC or 230 VAC
Full Numeric Keypad (CN20LT)

Specifications subject to change without notice.

INSTALLATION

Before beginning installation of your CN20 weight indicator, make certain that the instrument has
been received in good condition. Carefully remove the instrument from the shipping carton and
inspect it for any evidence of damage that may have taken place during shipment. Should your CN20
come already installed on a scale, the following information describing the installation of the
instrument does not apply to you.

Begin the installation by deciding where the instrument is to be mounted. The CN20 may come
mounted on a column or you may choose to mount it on a desktop or wall. Refer to Figure no. 1 for
illustrations of these various mounting arrangements. Note: If you use the mounting bracket on the
scale column you may select any of these variations. Two (2) holes are located in the mounting
bracket for attachment to the wall or column top. This bracket may be removed or left in place for
desktop use. To remove the bracket, pry outward on the bracket at each of the pivot points while
pressing the tilt buttons and pulling downward on the bracket.

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INSTALLATION, Cont.

Regardless of how you mount your CN20, it should be in a safe area where it will not be in the way of
normal traffic. The mounting bracket should be
securely fastened to the wall or column top so that it
cannot break loose from the mounting surface. After
the CN20 has been mounted, it may be connected to
the optional plug-in power supply or the batteries may
be installed.

Tilt

Desk Top

Figure No. 1

OPTIONAL PLUG-IN POWER SUPPLY

If you have ordered an optional plug-in power supply to
operate your CN20 from a wall outlet it may be
installed at this time. Remove the power supply
from the shipping carton and insert the output
power cable connector into the power jack
located on the underside of the CN20 enclosure.
Refer to Figure no. 2 for the location of the power
jack. Insert the power supply connector into the
wall outlet.

Press here
on both sides
to tilt

May be
rotated

Column Mount

Optional AC Power

Supply - 115 VAC

or 230 VAC Model

Power Jack

BATTERIES

If you did not order an optional plug-in power
supply or if you did but wish to operate the CN20
from batteries, you must install batteries before
operations can begin. The CN20 uses six (6) “D”
size Alkaline or Ni-Cad batteries. These batteries
are contained in a slide-out drawer at the back of
the instrument enclosure.

To remove the battery drawer, press down on the
release pad while pulling outward. Remove the

Bottom of

Instrument

battery drawer from the instrument. Install six (6)
“D” size batteries in the drawer making certain

Figure No. 2

that they are positioned in accordance with the
battery outline located in the bottom of the
drawer. Note: All six (6) batteries must be of the same type. They must all be Alkaline or they must all
be Ni-Cad. DO NOT mix Alkaline and Ni-Cad batteries. Refer to Figure no. 3 for illustration of battery
installation.

After placing all six (6) of the batteries in the drawer, replace the drawer in the CN20 and push it all
the way forward until the retaining latch snaps into place. Failure to push the drawer in until the latch
engages will keep the instrument from operating. Press the ON key. If the display turns on and the
BAT annunciator is off, the batteries have been installed correctly. If not, remove the tray and check
for one (1) or more improperly positioned batteries.

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