Rice Lake CLS420 User manual

CLS-420
420 Cargo Lift Scale
Version 1.15
Technical Manual
PN 96483 Rev D

An ISO 9001 registered company
© Rice Lake Weighing Systems. All rights reserved.
Rice Lake Weighing Systems®is a registered trademark of
Rice Lake Weighing Systems.
All other brand or product names within this publication are trademarks or
registered trademarks of their respective companies.
All information contained within this publication is, to the best of our knowledge, complete
and accurate at the time of publication. Rice Lake Weighing Systems reserves the right to
make changes to the technology, features, specifications and design of the equipment
without notice.
The most current version of this publication, software, firmware and all other product
updates can be found on our website:
www.ricelake.com

Contents
Contents i
1.0 Introduction..................................................................................................................................... 1
1.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2.1 Battery Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Considerations Before Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3.1 Forklift Derating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3.2 Forklift Battery and CLS Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 420 Digital Indicator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4.1 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4.2 LED Annunciators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4.3 Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.5 Indicator Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.6 Accepting Weight Data to the Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.7 iQube2 Junction Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.0 Installation .................................................................................................................................... 10
2.1 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1.1 Unpacking One Scale Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.1.2 Unpacking Two Scale Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.2 Before Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.3 Tools Required for Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.4 Scale Base Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.5 Install Forks onto Scale Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.6 Connect the Coiled Interface Cable to J-Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.7 Mounting the Indicator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.7.1 Mount Kit and Indicator Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.8 Cable Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.8.1 Power Indicator with the Forklift Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.8.2 Power Cable Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.8.3 Power Cable to Battery Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.8.4 Route the Load Cell Coiled Interface Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2.8.5 Grounding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2.9 Wireless Battery Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2.10 Battery Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.11 Charging the Lithium-Ion Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2.12 Calibrating the Lithium-Ion Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2.13 Lithium-Ion Battery Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2.14 General Precautions - Lithium ion Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.0 CLS-420 Calibration and Configuration....................................................................................... 27
3.1 Navigating Through Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.1.1 Editing Numerical Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.2 CLS-420 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.2.1 Devices used for Lifting of Calibration Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.2.2 Front Panel Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.3 CLS-420 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.3.1 Front Panel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.3.2 Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.3.3 Format Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.3.4 Calibration Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Technical training seminars are available through Rice Lake Weighing Systems.
Course descriptions and dates can be viewed at www.ricelake.com/training
or obtained by calling 715-234-9171 and asking for the training department.
© Rice Lake Weighing Systems. All rights reserved. Printed in the United States of America.
Specifications subject to change without notice. Rice Lake Weighing Systems is an ISO 9001 registered company.
June 13, 2017

ii CLS-420 Technical Manual
Contents
3.3.5 Accumulate Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
3.4 EDP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.4.1 EDP Command Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.4.2 Status Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.5 Continuous Output (Stream) Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
3.6 Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
3.7 Regulatory Mode Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
3.8 Serial Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
3.9 CLS-420 ABF Version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.9.1 Wi Fi Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.9.2 Installed WLAN Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
3.9.3 Reset Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
3.9.4 Power the Carriage Junction Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
3.9.5 Special Matchport Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
3.9.6 420 Core Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
3.10 ASCII Character Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
3.11 Front Panel Display Characters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
3.12 Conversion Factors for Secondary Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
4.0 Parts and Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
4.1 Daily Inspection Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
4.2 Cargo Lift Scale Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
4.2.1 Load Cell Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
4.2.2 iQube2 Junction Box Assembly (PN 167261), 28'' and 34'' Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
4.2.3 Junction Box with Quick Disconnects (PN 130826). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
4.2.4 Protective Angle with Battery Box Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
4.3 Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
4.3.1 CLS-420 Indicator (PN 162310) 5 Pin Wired with Power Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
4.3.2 CLS 420 Indicator, 10 Pin Connector, Used With iQube (98413). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
4.3.3 Mount Assembly for CLS-420 Indicator (PN 162310) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
4.3.4 Mount Assembly for CLS-420 Indicator (PN 98413) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
4.4 CLS-420 Indicator CPU Board Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
4.4.1 Board Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
4.5 NEMA 4X Polycarbonate Junction Box Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
4.5.1 Junction Box Board Replacement – Two Board Style . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
4.5.2 Junction Box Board Replacement and Wiring – One Board Style . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
4.5.3 Junction Box Board Replacement and Wiring – Quick Connect Style . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
4.6 IQube2 Junction Box Maintenance/Upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
4.6.1 iQube2 Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
4.6.2 iQube2 PCB Board Assembly Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
4.6.3 iQube2.3 Cross References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
4.7 Load Cell Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
4.7.1 Required Tools for Replacing a Load Cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
4.7.2 Load Cell Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
4.7.3 Forklift Flexure Troubleshooting - 28" and 34" Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
4.7.4 CLS-420 Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
4.8 LED Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
5.0 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
5.1 Troubleshooting Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
5.2 Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
6.0 CLS-420 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Rice Lake continually offers web-based video training on a growing selection
of product-related topics at no cost. Visit www.ricelake.com/webinars

1
1.0 Introduction
The CLS-420 is a rugged, dependable cargo lift scale that can withstand many years of repeated use. When
mounted on a forklift, the CLS-420 saves time and money by allowing loads to be weighed immediately instead of
carrying the load to a floor scale.
This manual is intended for use by individuals responsible for installing the cargo lift scale along with the 420
digital weight indicator (CLS-420). This manual includes information on the installation and maintenance of the
scale carriage, signal cable installation (if applicable), and the installation, configuration, and calibration of the 420
digital weight indicator.
While the functionality remains the same for a standard 420 digital weight indicator, there are certain menu
choices in the configuration section of this manual specific to this application.
The CLS-420 Operator Card, PN 96484 included with this manual, provides basic operating instructions. Please
leave the operator card with the CLS-420 when installation and configuration is complete.
Manuals can be viewed or downloaded from the Rice Lake Weighing Systems website at
www.ricelake.com/manuals
Warranty information can be found on the website at www.ricelake.com/warranties
1.1 O v e rvi e w
The scale carriage comes in three different sizes including: 28, 34 and 38 inches.
On board Features
Features of the basic cargo lift scale include:
• NTEP approved – Class III, 5,000 lb, 1:1000; Class II forklift, with 16" cleat style carriage (28'' & 34'' only)
• Non-NTEP – Class III, 8,000 lb, 1:1000 forklift with cleat style carriage (38'' only)
• Two stainless steel load cells
• Mechanical overload protection
• Flexure plates with bolts welded into place
• Cover plate
• Welded centering pin
•Viewport
• Two-channel iQube2®junction box
• Wired or wireless communication
Note
Figure 1-1. Fork Lift with CLS-420

2CLS-420 Technical Manual
1.2 Sa f e t y
Safety Signal Definitions:
Indicates an imminently hazardous situation that, if not avoided, will result in death or serious injury.
Includes hazards that are exposed when guards are removed.
Indicates a potentially hazardous situation that, if not avoided could result in serious injury or death.
Includes hazards that are exposed when guards are removed.
Indicates a potentially hazardous situation that, if not avoided, could result in minor or moderate injury.
Indicates information about procedures that, if not observed, could result in damage to equipment or
corruption to and loss of data.
General Safety
Do not operate or work on this equipment unless this manual has been read and all instructions are
understood. Failure to follow the instructions or heed the warnings could result in injury or death.
Contact any Rice Lake Weighing Systems dealer for replacement manuals.
Failure to heed may result in serious injury or death.
Some procedures described in this manual require work inside the indicator enclosure. These procedures are to be
performed by qualified service personnel only.
Take all necessary safety precautions when installing the scale carriage including wearing safety shoes, protective eye
wear, and using the proper tools.
Ensure feet, legs and other body parts are not under the scale when lowering.
Do not allow minors (children) or inexperienced persons to operate this unit.
Do not operate without all shields and guards in place.
Do not jump on the scale.
Do not use for purposes other then weight taking.
Do not place fingers into slots or possible pinch points.
Do not use any load bearing component that is worn beyond 5% of the original dimension.
Do not use this product if any of the components are cracked.
Do not exceed the rated load limit of the unit.
Do not make alterations or modifications to the unit.
Do not remove or obscure warning labels.
Keep hands, feet and loose clothing away from moving parts.
DANGER
WARNING
CAUTION
Important
WARNING

3
1.2.1 Battery Disposal
When using Lithium-ion batteries, be sure to observe the following precautions for disposal as stated in the
material safety data sheet regarding lithium-ion batteries.
Figure 1-2. Material Safety Data Sheet - Lithium Ion Batteries

4CLS-420 Technical Manual
1.3 Considerations Before Installation
1.3.1 Forklift Derating
Capacity Reduction Calculation
While the CLS-420 will fit most typical forklifts, there are considerations that must be taken into account prior to
installation. Due to the extra weight of the CLS-420, the net lifting capacity of the forklift is reduced by
approximately 10%. Use the formula below to calculate the amount to down-rate the lifting capacity and determine
the net capacity of the forklift.
CLS Classes and ID Plates
During the initial sale or installation of the CLS-420, remind the customer that they must have an updated ID plate
on the forklift stating the new lifting capacity and center of gravity information. This is required per OSHArules
and regulations.
1.3.2 Forklift Battery and CLS Installation
Take into consideration that the indicator power source will be connected directly to the battery of the
forklift. 12 volts is most typical for propane, gas and diesel forklifts.
Ensure the forklift has a negative ground electrical system; 12 volt systems must have a negative ground.
The CLS will not operate on a positive ground forklift. Refer to the forklift users manual to further verify
grounding requirements.
Standard CLS scales use a 9-36 V power supply for use on 12 V batteries. If the forklift is an electric system, make
sure to install:
• PN 166162 – DC-DC Converter, CLS, 18-75 VDC 0 12V output
• PN 166161 – Power Line Filter, CLS (for static protection)
If a peripheral is connected, consider grounding it directly to the CLS-420 indicator.
A = Truck Basic Capacity in pounds B = Inches from front wheel center line to fork face
C = Inches from face to truck rating point (usually 24) D = Weight of scale in pounds
E = Inches from front wheel center line to carriage face F = Inches from carriage face to scale horizontal center of gravity (HCG)
G = J + K (inches from carriage face to rear face of load H = Inches from fork face to new truck rating point
J = Thickness of fork K = Thickness of scale
28 inch 34 inch 38 inch
Vertical enter of gravity (VCG) of scale = 8.06 8.06 10.15
Horizontal center of gravity (HCG) of scale = 2.09 2.09 2.83
Effective thickness (ET) of scale = 4.55 4.55 6.06
Weight of scale = 392 420 987
Net Capacity A (B + C) - D (E + F)
E + G + H
=
CB
AD
G
F
Net
Capacity
HE
K
J
CAUTION
CAUTION

5
1.4 420 Digital Indicator
The 420 digital indicator is a single-channel serial weight indicator housed in a NEMAType 4X/IP66-rated
stainless steel enclosure. The indicator front panel consists of a large (1.8'', 44.5 mm), 6-digit, 7-segment LED
display and 21 keys.
Standard features of the CLS-420 include:
• ON/OFF switch to increase battery life and cycle power to the junction box
• Configurable digital inputs (2) and outputs (2)
• Electronic Data Processing (EDP) port dedicated to communication with the two-channel iQube2 in forklift
applications.
• A printer port for full duplex RS-232 or active transmit only and 20 mA current loop communications up to
38400 bps
• NTEP certified
• 9-36 VDC input or 10-60 VDC input - VDC range of new power supply
• The setpoint key on the indicator can be used in wireless versions to display battery hours remaining.
1.4.1 Front Panel
Figure 1-3 illustrates the 420 LED annunicators, keypad, and normal mode key functions.
Figure 1-3. 420 Front Panel
There are five symbols shown above the navigation keys (which represent up, down, enter, left, right). In setup
mode, the keys are used to navigate through menus, select digits within numeric values and increment/decrement
values.
The 420 has an off/off switch for the processor functions. Before opening the unit, ensure the 420 is
disconnected from the forklift battery power source.
1.4.2 LED Annunciators
The 420 display uses a set of six LED annunicators to provide additional information about the value being
displayed:
•Gross and Net annunciators are lit to show if the displayed weight is in gross or net.
• Center of zero ( ).Annunciator lights when the scale is zeroed (gross weight is within 0.25 graduations
of zero).
• Standstill ( ). Indicates when the scale is at standstill or within the specified motion band. Some
operations, including tare functions and printing, can only be done when the standstill symbol is displayed.
•lb and kg annunciators indicate the units associated with the displayed value: lb=pounds, kg=kilograms.
lb
kg
Count
Gross
Net
DISPLAY
TARE SETPOINT TIME/DATE
POWER
I/O
23 4 5
7 8 9 06
CLR
ZERO GROSS
NET
TARE
ENTERMODE SAMPLE
UNITS PRINT
Navigation
Keys
Power Key
WARNING
0

6CLS-420 Technical Manual
• The displayed units can also be set to short tons (tn), metric tons (t), ounces (oz), grams (g), or NONE (no
units information displayed). The lb and kg LEDs function as primary and secondary units annunciators for
some combinations of primary and secondary units. If neither primary nor secondary units are lb or kg the lb
annunciator is lit for primary units, the kg annunicator is lit for secondary units.
•Table 1-1 shows which annunciators are used for all combinations of configured primary and secondary
units. Examples:
a.If the primary unit is pounds (lb) and the secondary unit is kilograms (kg), the lb LED is lit for
primary units, kg for secondary units.
b.If the primary unit is pounds (lb) and the secondary unit is short tons (tn), the lb LED is lit for
primary units, kg for secondary units. There is not an LED for short tons, so the kg LED is used for
secondary units annunciator.
c.If the primary unit is short tons (tn) and the secondary unit is pounds (lb), the lb LED is lit for
primary units (tn), and kg is lit for secondary units (lb). Because there is no LED for short tons, the
lb and kg LEDs are used as primary and secondary units annunciators.
1.4.3 Modes of Operation
The 420 has four modes of operation, as listed below.
Weigh Mode
Weigh mode is the default mode of the indicator. The indicator displays gross or net weights as required, using the
LED annunciators described in Section 1.4.2 on page 5 to indicate the scale status and the type of weight value
displayed. Once configuration is complete and a legal seal is affixed to the back of the indicator, this is the primary
mode in which the 420 can operate.
Setup Mode
Most of the procedures described in this manual, including configuration and calibration, require the indicator to be
in setup mode.
To enter setup mode, remove the setup screw, insert a small screwdriver and press the setup switch once. The
indicator display changes to CONFIG.
Test Mode
Test mode provides a number of diagnostic functions for the 420 indicator. Like setup mode, test mode is entered
using the setup switch. See Section 3.6 on page 39 for more information about entering and using test mode.
Test mode is intended for factory and technician use only.
Front Panel Setup Mode
Hold the UNITS key for three seconds to enter front panel setup mode. Use front panel setup to change setpoint and
to set the time and date.
Entering the front panel setup mode can be done without breaking the seal.
Primary Unit
Secondary Unit
lb kg oz gtn tnone
lb lb / lb lb / kg lb / oz lb / g lb / kg
kg kg / lb kg / kg kg / oz kg / g lb / kg
oz oz / lb oz / kg oz / oz oz / g oz / kg
g g / lb g / kg g / oz g / g g / kg
tn lb / kg lb / kg lb / oz lb / g lb / lb lb / kg lb / kg
tlb / kg lb / lb lb / kg
none lb / kg lb / kg lb / lb
Table 1-1. Units Annunciators, Showing Primary / Secondary LEDs Used for All Configurations
Note
Note

7
1.5 Indicator Operations
Basic 420 operations are summarized below.
Toggle Gross/Net Mode
Press to toggle the display mode between gross and net. If a tare value has been entered or acquired, the
net value is the gross weight minus the tare.
Toggle Units
Press to switch between primary and secondary units.
Zero Scale
1. In gross mode, remove all weight from the scale and wait for to light.
2. Press . lights to indicate the scale is zeroed.
Acquire Tare
1. Place a container on the scale and wait for to light.
2. Press to acquire the tare weight of the container. Net weight is displayed and the Net LED is lit.
Remove Stored Tare Value
1. Remove all weight from the scale and wait for to light.
2. Press .
Gross weight is displayed and the Gross LED is lit.
Set Date
1. In the front panel setup mode, use the arrow keys to toggle to DATE.
2. Press the Down arrow or Enter to enter the date in the format configured for the indicator.
Set Time
1. In the front panel setup mode, use the arrow keys to toggle to TIME.
2. Press the Down arrow or Enter to enter the time in 24-hour format, then press the Enter key to save that
value.
Display Accumulator
1. Hold the (MODE) GROSS/NET key for three seconds to display the accumulated valued if enabled in
configuration. The accumulated value will be displayed for about 10 seconds.
2. To clear the accumulator, press the CLR key twice while the accumulated value is being displayed.
GROSS
NET
UNITS
ZERO
0
TARE
TARE

8CLS-420 Technical Manual
1.6 Accepting Weight Data to the Indicator
The 420 indicator accepts data from the iQube2®junction box using one of the following methods. Use the
instructions for the style that was ordered.
• Wired – coil cable, see Section 2.6 on page 16.
Figure 1-4. Wired Signal Coil Cable
• Wireless Communication – attached to the back of the 420 indicator, it collects data from the iQube2 without
the use of a cable. The iQube2 uses a lithium-ion battery. See Section 2.9 on page 23.
Figure 1-5. Wireless Version of Communication
Wireless communication from the
indicator to the iQube2 which is
located on the scales angle
bracket.
Lithium-Ion battery housed in a
battery box.

9
1.7 iQube2 Junction Box
The latest CLS-420 includes an updated version of the iQube2 junction box. This design is built to allow service
technicians to easily service the unit in the field. It also replaces the older style j-boxes, originally used in the CLS-
420. Below is an overview of the new features and functions.
Figure 1-6. iQube2 Junction Box
Coiled cable
connection Mild steel
construction
Field replaceable load
cell connectors

10 CLS-420 Technical Manual
2.0 Installation
This section describes procedures for installing the CLS-420 to a forklift.
Take all necessary safety precautions when installing the scale carriage, including wearing safety shoes
and protective eyewear, and using the proper tools which are listed in Section 2.3 on page 13.
The CLS-420 is shipped from the factory with the scale already calibrated to the indicator. Minimal recalibration
and adjustments may be necessary once the scale is installed onto the fork lift. Calibration steps are contained in
Section 3.2 on page 28.
2.1 Unpacking
The CLS-420 is shipped upright on a sealed pallet with one or two scales per pallet.
Figure 2-1. CLS-420 Packaging
Upon receipt of the shipping pallet, inspect it for any visible signs of damage. Immediately after unpacking,
visually inspect the contents to ensure all components are included and undamaged. The shipping pallet should
contain the following:
• One or two scale carriage assembly with cover plate
• Indicator component box which includes:
One electronic indicator with mounting bracket and hardware
One power cable
• Hardware Component Box which includes:
Two cleats with four bolts
Cage clamp mounting assembly and hardware
One coiled interface cable (wired version)
One power cable
Hardware for battery connection (wireless version)
Two lithium-ion batteries (wireless version)
Two-bay battery charger (wireless version)
To ensure that all products received from the manufacturer are in good shape upon arrival, it is recommended
to fully inspect all contents and properly fill out the bill of lading.
If any parts were damaged in shipment, notify the shipper and Rice Lake Weighing Systems immediately.
The scales are shipped in an upright position, to allow for ease of installation. The indicator and accessories are
located in a hardware component box.
WARNING
Hardware
component
boxes
Note

11
2.1.1 Unpacking One Scale Configuration
Follow the instructions in Figure 2-2 for unpacking a one scale configuration.
Figure 2-2. Shipping Pallet for One Scale
Protective wood
covering
Wood shipping pallet
Hardware
component box
Step 1: Clip plastic band securing hardware
component box
Step 2: Remove protective wood covering
Hardware component box
plastic banding
Exploded view of components
Protective wood
covering
Front
pallet
Plastic banding securing
scale to pallet
Step 3: Remove front pallet support
Step 4: Clip remaining plastic bands
Step 5: Remove protective wood
Protective wood
covering
Scale is now ready for installation
Scale
Front pallet support

12 CLS-420 Technical Manual
2.1.2 Unpacking Two Scale Configuration
Follow instructions in Figure 2-3 for unpacking a two scale configuration.
When installing from a two scale configuration, complete all of steps for scale one before clipping plastic
bands securing second scale to the shipping pallet.
Figure 2-3. Shipping Pallets for Two Scales
WARNING
Hardware
component boxes
Exploded view of components
Protective wood
covering
Wood shipping pallet
Plastic
banding
Step 1: Clip top plastic bands
Step 2: Clip plastic band to release hardware
component boxes
Step 3: Remove hardware component boxes
Step 4: Clip plastic bands from first scale
Step 5: Remove protective wood covering for first Scale one is ready for installation.
DO NOT clip the plastic band from scale
two until scale one is installed
Step 6: Clip plastic bands from scale two.
Step 7: Remove protective wood covering for
second scale.
Scale two is ready for installation.
Protective wood
covering
Scale
Plastic
banding
Protective
wood
covering

13
2.2 Before Installation
Before installing the CLS-420, the forklift should be in good operating condition in order to get optimal weighing
accuracy. Review following items prior to installing the CLS-420.
• Inspect the forklift tines for damage.
• Check the locking pin on the forks for proper function.
• Check and adjust the lift chain so the heel of the forks have 1/2" to 1" of clearance from the floor when the
carriage is down and the mast is vertical.
• The slot for the center pin should be clear of grease and debris.
• The top cleats of the forklift rest on the top of the scale and should remain clear of grease and debris that
could alter the scale performance.
• The forklift carriage should be flat. A bent or bowed carriage will affect the performance of the scale.
• Check the width of the forklift carriage and make sure when the scale is installed the flexures have clearance.
• Check to ensure the wireless angle bracket on the scale does not interfere with the forklift’s load backrest
extension.
The CLS-420 will fit most typical forklifts, however, the following considerations must be noted: the height of the
carriage, the width of the carriage inside of the guards (if applicable) and the voltage of the forklift.
The indicator will be connected directly to the battery of the forklift. Ensure the type and style of forklift and the
type of power it provides is compatible with the indicator. Most propane, gas, and diesel fueled forklifts provide 12
volts of power. Some diesel models also provide 24 volts and electric forklifts provide 36 to 48 volts of power. The
CLS-420 has a 9-36 VDC and a 10-60 VDC power supply option. Refer to the forklift user manual for its
grounding specifications. The CLS-420 will not operate on a positive ground.
All systems must have a negative ground.
2.3 Tools Required for Installation
Once the forklift is deemed in good mechanical and operating condition, the following tools will be used to remove
the scale from its shipping pallet and install onto the forklift.
Tool Size Purpose of Tool
Socket wrench 3/4" To unbolt the fastening bolts holding the scale to the pallet and to open the
top cover plate for wired versions
Allen wrench 1/2" To bolt and unbolt the bottom cleats of the scale
Wrench - 2" adjustable 1-1/2"
1-5/8"
For adjusting the shim bolts and jam nuts
Note: Use a 2" adjustable wrench. Both the shim bolts and jam nuts
are painted and a smaller wrench will not fit.
Tin snips or band cutters To cut the metal banding surrounding the CLS-420 on the pallet
Torque wrench w/ 1/2" Allen 1/2" To tighten the cleats to 125 ft-lb
Electric Grinder - if necessary For grinding the center pin if necessary
Table 2-1. Recommended Tools for Unpacking the CLS-420
Important

14 CLS-420 Technical Manual
2.4 Scale Base Installation
Use the following steps to install the scale base to the fork lift.
Figure 2-4. Anti-shift Centering Pin, Shim Bolts and Top Cleat Locations
Verify that the shim bolts are flush with the back plate of the scale. If they are not flush, the entire scale
will be out of alignment when attaching it the forklift. This will make it difficult to make final adjustments
once the scale is mounted to the forklift.
1. Make sure the forklift tines are removed and move the forklift in close to the pallet and scale.
2. Ensure the anti-shift centering pin on the scale assembly is aligned with the center notch on the forklift
carriage.
* The scale’s centering pin should be aligned with the middle notch of the forklift carriage.
* Verify that the centering pin is adjusted so that the pin is located well within the center notch area of the carriage.
* The centering pin should not touch the bottom of the notch on the original carriage, as this will cause side to side tilting
of the scale.
* The outside top cleats provide support to the scale assembly and the centering pin only helps to position the scale on
the forklift carriage.
* The centering pin should not bear any weight. If it does, the use of a grinder to grind down the centering pin will be
necessary.
3. Tilt the mast forward slightly to catch the scale assembly.
4. Carefully and slowly raise the scale carriage slightly so the top cleats (cleat location shown in Figure 2-4)
hook onto the forklift carriage. If they do not hook, carefully push the scale toward the forklift as it is being
raised.
Ensure fingers and hands are away from the top cleats to avoid pinching and bodily harm.
5. Tilt the mast back to secure the connection and raise the scale to shoulder height.
6. Attach the bottom cleats to the bottom of the scale assembly (see Figure 2-5 for bottom cleat location), so
that the lip of the cleat is behind the scale carriage.
7. Torque the bottom cleat retaining bolts to 125 ft-lb.
Failure to properly torque the bottom plate retaining bolts may result in bodily harm or damage to
equipment.
8. Adjust the shim bolts so there is a minimal clearance between the bottom cleats and the scale carriage of
0.020-inch thickness. This can be measured by using the included feeler gauge.
To p c l e a t
location
Anti-shift
centering pin
Shim bolt
hole location(s)
Important
Important
CAUTION
WARNING

15
Failure to adjust shim bolts to proper clearance of 0.020 inches may result in binding, poor accuracy or
improper fit of attachment to forklift.
Figure 2-5. Bottom Cleat Location and Assembly
9. Upon successful installation and calibration verification, seal the carriage j-box and load cell quick
disconnects for Weights and Measurements approval.
Important
Bottom cleat
retaining bolts
Shim bolts
Bottom cleat
Illustration shown is with part
of the flexure removed to
show shim bolt location.
Insert a feeler gauge to measure
a .020 inch thickness between
bottom cleat and scale carriage.
Scale carriage

16 CLS-420 Technical Manual
2.5 Install Forks onto Scale Assembly
Once the scale is properly installed, the forks need to be installed onto the scale assembly.
1. Align a fork to the center of the scale assembly making sure it is over the top of the assembly.
2. Lift the carriage slightly to set the fork, and then slide the fork to the side of the scale. Let it stop in the 2nd
notch from the end and latch it in place.
3. Repeat steps one and two for other fork, sliding it the opposite direction on the scale.
For accurate weighing, it is best to leave the forks at the second notch from the outside edge of the scale.
Figure 2-6. Fork Attachment
2.6 Connect the Coiled Interface Cable to J-Box
Figure 2-7. Connecting The Coiled Cable
1. Loosen the bolt holding the cover to the scale assembly and remove cover.
2. Assemble loop clamp kit to the coiled interface cable.
Note
Last notch
open
Fork
Loop Clamp Assembly
PN 167250
Bolt
Washer
Scale Cover
Assembly
Washer
Nut
Coiled Cable
Loop
Clamp
Loop Clamp Assembly
PN 150720
Used with Scale Cover
Assembly PN 97118
Used with Scale Cover
Assembly PN 162340