Rice Lake CLS420 User manual

PRESENTED BY
JPBOWLIN.COM
817.332.8116
J.P. Bowlin is a quality-driven Calibration Company
that has provided calibration, repair and sales
of all types of weighing and measurement products since 1931.

96483 Rev A
CLS-420
420 Cargo Lift Scale
Version 1.15
Installation Manual

i
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.
© 2012 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.
Version 1.14, November 2012
Contents
1.0 Introduction ................................................................................................................................... 1
1.1 Overview........................................................................................................................... 2
1.2 Considerations Before Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2.1 CLS Classes and ID Plates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 420 Digital Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3.1 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3.2 LED Annunicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3.3 Indicator Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3.4 Modes of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4 Accepting Weight Data to the Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.0 Scale Base Installation................................................................................................................ 7
2.1 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Before Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Tools Needed to Install the CLS-420 Onto the Fork Truck or Mobile Lift. . . . . . . . . . . . . . . . . . . . . . . 8
2.4 Scale Base Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.0 Indicator Hardware Setup.......................................................................................................... 12
3.1 Mounting the 420 Indicator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.2 Cable Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.3 Supplying Power to the Indicator From the Forklift Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.4 Routing the Power/Serial Communications Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.5 Supplying Power to the Two-Channel iQube Using a Lithium-Ion Battery . . . . . . . . . . . . . . . . . . . . . 15
3.5.1 Lithium-Ion Battery Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.5.2 General Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.5.3 Charging the Lithium-Ion Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.5.4 Calibrating the Lithium-Ion Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.5.5 Battery Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.5.6 Battery Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.6 Two-Channel iQube Junction Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.0 ABF Version .................................................................................................................................. 7
4.1 ABF Version Differences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1.1 Mount Kit Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1.2 Rear Cover - External Connections:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1.3 Installed WLAN Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1.4 Default Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1.5 Supplying power to the carriage J-box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2 Special Matchport Firmware. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2.1 420 Core Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.0 Configuration ............................................................................................................................. 22

ii CLS-420 Installation Manual
Rice Lake continually offers web-based video training on a growing selection
of product-related topics at no cost. Visit www.ricelake.com/webinars.
5.1 Configuration Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.1.1 EDP Command Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.1.2 Front Panel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.2 Menu Structures and Parameter Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.2.1 Configuration Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.2.2 Format Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.2.3 Calibration Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.2.4 SERIAL Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.2.5 Program Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.2.6 Accumulate Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.2.7 Setpoint Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.2.8 Digital Input Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.2.9 Analog Output Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.2.10 Version Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6.0 Calibration ................................................................................................................................. 38
6.1 Front Panel Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7.0 Repair Parts List......................................................................................................................... 39
8.0 Appendix .................................................................................................................................... 40
8.1 Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
8.1.1 Displayed Error Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
8.1.2 Using the XE EDP Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8.2 Status Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8.2.1 Using the P EDP Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8.2.2 Using the ZZ EDP Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8.3 Continuous Output (Stream) Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
8.4 ASCII Character Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
8.5 Front Panel Display Characters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
8.6 Conversion Factors for Secondary Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
8.7 Digital Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
8.7.1 DIGFLxParameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
8.7.2 DFSENS and DFTHRH Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
8.7.3 Setting the Digital Filter Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
8.8 Analog Output Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
8.9 Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
8.10 Regulatory Mode Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
8.11 LED Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
8.12 420 Indicator Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
DAILY INSPECTION CHECKLIST FOR LIFT TRUCK SCALE USERS........................................................................................... 53

Introduction 1
1.0 Introduction
This manual is intended for use by individuals responsible for installing the CLS-420 Cargo Lift Scale along with
the 420 digital weight indicator. This manual covers 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.
Note
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 for users
of the CLS-420 and the 420 indicator. Please leave the operator card with the indicator 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 Overview
The CLS-420 Cargo Lift Scale 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 you to weigh loads immediately
instead of carrying the load to a floor scale.
The CLS-420 scale carriage comes in three different sizes including: 28 in, 34 in, 38 in.
The CLS-420 is used with Rice Lake’s 420 digital weight indicator andsetup and calibration of the indicator is
discussed in detail in the following sections.
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
•NTEP approved, Class III, 8,000 lb, 1:1000 
(38 in only)
•Class III forklift with cleat style carriage (38 in
only)
•Two (2) stainless steel load cells
•Mechanical overload protection
•Flexure plates with bolts welded into place
•Cover plate
•Welded centering pin
•Viewport
•Two-channel iQube®
•Wired or wireless communication
Figure 1-1. Fork Lift with CLS-420

2CLS-420 Installation Manual
1.3 Saf ety
Safety Symbol Definitions:
Important
CAUTION
WARNING
DANGER
Indicates an imminently hazardous situation that, if not avoided, will result in death or serious injury.
Indicates a potentially hazardous situation that, if not avoided could result in serious injury or death, and
includes hazards that are exposed when guards are removed.
Indicates a potentially hazardous situation that, if not avoided may 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
WARNING
Do not operate or work on this equipment unless you have read and understand the instructions and
warnings in this manual. 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. Proper care is your
responsibility.
Failure to heed may result in serious injury of 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.
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.
DO NOT use near water.
Keep hands, feet and loose clothing away from moving parts.

CLS-420 Installation Manual 3
1.2 Considerations Before Installation
While the CLS-420 Cargo Lift Scale will fit most typical forklifts, there are certain considerations that must be
taken into account prior to installing the scale. Due to the extra weight of the CLS-420, the net lifting capacity of
the forklift scale is decreased by approximately 10%. Use the formula below to calculate the net capacity of the
unit.
Note Formulas can give you a good estimate of how capacity will be affected. You should work closely with your
forkliftmanufacturerbeforemakingadecision.Theirdatareflects,inmostcases,testingwithspecificforklifts
and attachments.
Net Capacity = A(B + C) - D (E + F)
E + G + H
Where:
A = Truck basic capacity in pounds
B = Inches from the front wheel center line to fork face
C = Inches from the fork face to the truck rating point (usually 24")
D = Weight of the scale in pounds (428 lbs)
E = Inches from the front wheel center line to the carriage face
F = Inches from the carriage face to scale Horizontal Center of Gravity (HCG)
G = J + K (inches from the carriage face to the rear fact of load)
H = Inches from fork face to new truck rating point
J = Thickness of fork
K = Thickness of scale
CAUTION
Another consideration is the indicator power source will be connected directly to the battery of the
forklift.Mosttypicalis12voltsforpropane,gasanddieselforklifts.However,somedieselforkliftsare24
volts.
12 and 48 volt systems must have a negative ground so ensure the forklift has a negative ground
electricalsystem.TheCLSSeriesCargoLiftScalewillnotoperateonapositivegroundforklift.Referto
the forklift users manual to further verify grounding requirements.
1.2.1 CLS Classes and ID Plates
During the initial sale and installation of the CLS-420, you need to remind your customer that they must have an ID
plate on their forklift updated stating the new lifting capacity and center of gravity information. This requirement is
per OSHA rules and regulations.

4CLS-420 Installation Manual
1.3 420 Digital Indicator
The 420 is a single-channel serial weight indicator housed in a NEMA 4X/IP66-rated stainless steel enclosure. The
indicator front panel consists of a large (1.8 in, 44.5 mm), six-digit, seven-segment LED display and 21 button
keypad.
Features of the standard CLS-420 include:
• Two configurable digital inputs and two configurable outputs
• Electronic data processing (EDP) port dedicated to communication with the two-channel iQube in forklift
applications.
• Printer port for full duplex RS-232 or active transmit only 20 mA current loop communications at up to
38400 bps
• NTEP certified
• 9-36 VDC input - VDC range of new power supply
• The setpoint key on the indicator can be used for wireless versions to display battery hours remaining.
1.3.1 Front Panel
Figure 1-2 shows the 420 LED annunicators, keypad, and normal mode key functions.
MC
LH
$PVOU
(SPTT
/FU
%*41-":
5"3& 4&510*/5 5*.&%"5&
108&3
*0
  
   
$-3
;&30 (3044
/&5
5"3&
&/5&3.0%& 4".1-&
6/*54 13*/5
Figure 1-2. 420 Front Panel, Showing LED Annunicators and Normal Mode Key Functions
The symbols shown above the keys (representing up, down, enter, left, right), describe the key functions assigned
in setup mode. In setup mode, the keys are used to navigate through menus, select digits within numeric values and
increment/decrement values.
The 420 also has a Power key. Use the Power key to turn the indicator on or off.
WARNING
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.

CLS-420 Installation Manual 5
1.3.2 LED Annunicators
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 whether the displayed weight is a gross or net weight.
• Center of zero ( ): Gross weight is within 0.25 graduations of zero. This annunciator lights when the
scale is zeroed.
• Standstill ( ): 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 shown.
•lb andkg annunciators indicate the units associated with the displayed value: lb=pounds, kg=kilograms.
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, kg for secondary units.
Table 1-1 shows which annunciators are used for all combinations of configured primary and secondary units. For
example:
• 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.
• 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 as the secondary
units annunciator.
• 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.
Table 1-1. Units Annunciators, Showing Primary / Secondary LEDs Used for All Configurations
Primary Unit
Secondary Unit
lb kg oz g tn t none
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
t lb / kg lb / lb lb / kg
none lb / kg lb / kg lb / lb
1.3.3 Indicator Operations
Basic 420 operations are summarized below.
Toggle Gross/Net Mode
Press the GROSS/NET key to switch the display mode from gross to net, or from net to gross. If a tare value has been
entered or acquired, the net value is the gross weight minus the tare.
Gross mode is shown by the Gross annunciator; net mode is shown by the Net annunciator.
Toggle Units
Press the UNITS key to switch between primary and secondary units. The appropriate units LED under the display
is lit.
Zero Scale
1. In gross mode, remove all weight from the scale and wait for the standstill annunciator ( ).
2. Press the ZERO key. The center of zero ( ) annunciator lights to indicate the scale is zeroed.

6CLS-420 Installation Manual
Acquire Tare
1. Place container on scale and wait for the standstill annunciator ( ).
2. Press the TARE key to acquire the tare weight of the container. Net weight is displayed and net annunciator
is lit.
Remove Stored Tare Value
1. Remove all weight from the scale and wait for the standstill annunicator.
2. Press the TARE key. The Gross annunicator is lit.
Set Date
In the front panel setup mode, use the arrow keys to toggle to DATE. Press the Down arrow or Enter to enter the date
in the format configured for the indicator.
Set Time
In the front panel setup mode, use the arrow keys to toggle to TIME. 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
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. To clear the accumulator, press the CLR key twice
while the accumulated value is being displayed.
1.3.4 Modes of Operation
The 420 has four modes of operation:
Normal (Primary) mode
Normal mode is the “default” mode of the indicator. The indicator displays gross or net weights as required,
using the LED annunciators described in Section 1.3.2 on page 5 to indicate 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 require the indicator to be in setup mode, including
configuration and calibration.
To enter setup mode, remove the setup screw and insert a small screwdriver pressing the setup switch once.
The indicator display changes to show the word 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 8.9 on page 49 for more information about entering and using test
mode.
NOTE: 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.
Note This can be done without breaking the seal.

CLS-420 Installation Manual 7
1.4 Accepting Weight Data to the Indicator
The 420 indicator can accept data in two different ways from the two-channel iQube and depending upon which
version is purchased, will come with different components. They are:
• Wired - coil cable
Figure 1-3. Coil Wired Signal Cable That Runs Between the Indicator and the Two-Channel iQube
• Wireless - attached onto the back of the 420 indicator and collects data from the two-channel iQube
without the use of a coil wire cable. The two-channel iQube uses a lithium-ion battery which is housed
on the scale.
Wireless
communication
between the
indicator to the two
channel iQube which
is located on the
forklift and is
powered by a
Lithium-Ion battery
housed in a battery
box.
Figure 1-4. Wireless Version of Communication

7CLS-420 Installation Manual
2.0 Scale Base Installation
This section describes procedures for installing the CLS-420 scale base.
WARNING
Takeallnecessarysafetyprecautionswheninstallingthescalecarriage,includingwearingsafetyshoes
and protective eyewear, and using the proper tools which are listed in Section 2.3.
The CLS-420 Cargo Lift Scale is shipped from the factory with the scale already calibrated to the indicator.
Minimal recalibration and adjustments might be necessary once the scale is installed onto the fork lift. Those
calibration steps are contained in Section 6.1.
2.1 Unpacking
The CLS-420 Cargo Lift Scale is shipped upright on a sealed pallet as shown in Figure 2-1.
Component
parts inside of
box
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 (1) scale carriage assembly with cover plate
• Indicator component box which includes:
• One (1) electronic indicator with mounting bracket and hardware
• One (1) power cable
• CLS-420 Cargo Lift Scale installation manual
• Hardware Component Box which includes:
• Two (2) cleats with four bolts
• Cage clamp mounting assembly and hardware
• One (1) coiled interface cable (for the wired version)
• Two (2) lithium-ion batteries (for the wireless version)
• Two-bay battery charger (for the wireless version)
Note Toensurethatallproductsreceivedfromthemanufacturerareingoodshapeuponarrival,itisrecommended
to fully inspect all contents and properly fill out the bill of lading.
If any parts were damaged in shipment, notify the shipper immediately.

CLS-420 Installation Manual 8
2.2 Before Installation
Before installing the CLS-420 on a forklift, the forklift should be in good operating condition in order to get the
optimal amount of weighing accuracy. The following items are things to look for prior to installing the CLS-420
onto a forklift:
• Inspect the forklift tines for any 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 scales’ performance.
It should be noted that while Rice Lake’s CLS-420 will fit most typical forklifts, some considerations must be
noted. The height of the carriage, width of the carriage inside of the guards, if applicable and voltage of the fork
truck must be taken into consideration.
The indicator will be connected directly to the battery of the fork truck. Ensure the type and style of fork truck and
the type of power it provides will be compatible with the indicator. Most propane, gas, and diesel fueled fork trucks
provide 12 volts of power. Some diesel models also provide 24 volts and electric fork trucks provide 36 to 48 volts
of power. The CLS-series scales work with 12-36 VDC power source.
Important
All systems must have a negative ground.
2.3 Tools Needed to Install the CLS-420 Onto the Fork Truck or Mobile Lift
Once the forklift is deemed in good mechanical and operating condition, you’ll need the following tools to remove
it from its shipping pallet and install onto the forklift.
Table 2-1. Recommended Tools for Unpacking the CLS-420
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 as both the shim bolts and jam nuts are
painted and a smaller wrench wouldn’t fit.
Tin snips or band cutters To cut the metal banding surrounding the CLS while on the pallet
Torque wrench w/ 1/2" Allen 1/2" To tighten the cleats to 125 ft-lbs
Electric Grinder - if necessary For grinding the center pin if necessary

9CLS-420 Installation Manual
2.4 Scale Base Installation
The scale and indicator are shipped in an upright position as illustrated in Figure 2-2 and are enclosed in a
protective wood cover. The upright position allows for ease of installation, especially if one person is installing the
scale.
Protective wood
covering
Metal banding
Steel shipping pallet
Protective wood
enclosure for
indicator
Step 1: Clip
metal bands
Figure 2-2. Scale Component Parts on Shipping Pallet
Use the following steps to install the scale base to the fork lift.
1. Clip the three metal bands that are encircling the scale and component box on the backside of the pallet
(shown in Figure 2-2) and also remove the protective wood pieces which protect the sides of the scale.
2. Remove the wooden cover containing the indicator. It should be noted that there are two screws holding
the indicator to the shipping pallet. Back those two screws out to remove the indicator.
3. Loosen the bolts from the scale carriage assembly and back them out using a 3/4" socket wrench. The nuts
holding the bolts on the backside of the scale are welded onto the scale which requires the use of only one
socket wrench. This is what holds the scale in an upright position.
Step 3: Back out
anchoring bolts using
3/4" socket wrench
and discard the bolts
Step 4: Remove front
portion of the steel
pallet
Figure 2-3. Bolt Location on Pallet
4. Remove the front portion of the steel pallet that the scale is sitting on. It will break away from the rest of
the pallet.

Top cleat
location
Shim bolt
hole location(s)
Anti-shift centering
pin
CLS-420 Installation Manual 10
Figure 2-4. Removal of Steel Pallet and Top Cleat Location
5. Verify that the shim bolts are flush with the back plate of the scale. Not doing so will place the entire scale
out of alignment when attaching it onto the forklift and will make it difficult to make final adjustments
once the scale is mounted to the forklift.
6. Seal the two-channel iQube if it is to be used in Legal-For-Trade applications.
7. Making sure the forklift tines are removed from the forklift, move the forklift in close to the pallet and
scale.
8. Carefully and slowly raise the scale carriage slightly so the top cleats (cleat location shown in Figure 2-4)
of the scale hook onto the forklift carriage.
9. Ensure the anti-shift centering pin on the scale assembly is aligned with the center notch on the forklift
carriage.
WARNING
Note The scale’s centering pin should be aligned with the middle notch of the truck carriage. Verify that the
centering pin is adjusted so that the pin is located well within the center notch area of the carriage. The
centeringpin shouldnottouch thebottom ofthe notch onthe originalcarriage, as thiswill causeside to side
tilting of the scale. The outside top cleats provide support to the scale assembly and the centering pin only
helpstopositionthescaleontheforkliftcarriage.Thecenteringpinshouldnotbearanyweight.Ifitdoes,the
use of a grinder to grind down the centering pin will help remedy that.
10. Tilt the mast forward to catch the scale assembly and carefully raise the carriage to a comfortable working
position.
11. Attach the bottom cleats to the bottom of the scale assembly (see Figure 2-5), so that the lip of the cleat is
behind the scale carriage.
12. Torque the bottom cleat retaining bolts to 125 ft-lbs (shown in Figure 2-5 for bottom cleat location).
Failure to properly torque the bottom plate retaining bolts may result in bodily harm or damage to
equipment.
13. Next, adjust the shim bolts so that they are adjusted for minimal clearance between the bottom cleats and
the scale carriage. This clearance needs to be .020 inch thickness and can be measured by using a feeler
gauge.

11 CLS-420 Installation Manual
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
Figure 2-5. Bottom Cleat Location and Assembly
14. Now reattach the forklift tines to the scale assembly by attaching them in the center of the scale and sliding
them off to the sides.

CLS-420 Installation Manual 12
3.0 Indicator Hardware Setup
3.1 Mounting the 420 Indicator
Location of the indicator is a matter of operator preference and should be installed in a location that allows for free
vision.
The universal mounting bracket which is included (shown in Figure 3-1), enables the indicator to be mounted to the
safety cage using the supplied hardware.
Figure 3-1. CLS Mounting Bracket
The indicator tilt position is adjustable by using a wrench so you can pick the best viewing angle for the operator.
Vibration isolators are also included in the supplied mounting bracket hardware. This cushions the indicator from
vibration. These vibration isolators are shown below.
Rear Side of
Indicator
Vibration Isolators
Figure 3-2. Vibration Isolator Control Location
Note To permanently lock the indicator mounting bolts, Rice Lake Weighing Systems recommends using
Locktite 262

13 CLS-420 Installation Manual
3.2 Cable Connections
The 420 indicator provides two cord grips and two MIL-C connectors for cabling into the indicator: The free cord
grip comes with a plug installed to prevent moisture from entering the enclosure.
Figure 3-3 shows the assignments for the 420 cord grips.
Front of
indicator Setup switch
access screw
MIL-C power
cable connecting to
forklift battery
RS-232 if used
(plugged) Wireless
scale
indicator
transiever
Wired scale
connection
(not wired for the
wireless version)
Backplate
Bottom View
Figure 3-3. 420 Rear of Indicator
3.3 Supplying Power to the Indicator From the Forklift Battery
CAUTION
Theindicatorpowersourcewillbeconnecteddirectlytothebatteryoftheforklift.Mosttypicalis12volts
for propane, gas and diesel forklifts. However, some diesel forklifts are 24 volts.
12 and 48 volt systems must have a negative ground so ensure the forklift has a negative ground
electrical system. The CLS series cargo lift scale will not operate on a positive ground forklift.
Refer to the forklift user’s manual for further verify grounding requirements.
The indicator draws its power from the forklift battery. After the indicator is mounted, run the power cable along
the forklift chassis down to the forklift battery.
Run power cable along
chassis to the forklift
scale battery
Figure 3-4. Run Power Cable to the Forklift Battery
Note DO NOT plug in the power connector into the bottom of the indicator until power hookup is completed.

CLS-420 Installation Manual 14
A supplied in-line fuse is also included with the CLS-series cargo lift scale. The fuse comes enclosed in an in-line
fuseholder (shown in Figure 3-5) and is attached where the stripped termination of the wires is located.
Replacement of the in-line fuse is described in the CLS-Series Service manual if needed.
Figure 3-5. Inline Fuse
Attach the three stripped wires to the forklift battery using the following wire code
Note Supplied termination hardware includes (3) 1/4" eyelets for 1/4" bolts.
Table 3-1. Power Hookups to Forklift Battery
Wire Color Signal
Red Positive on Battery
Black Negative on Battery
Blue Chassis Ground
3.4 Routing the Power/Serial Communications Cable
Special care should be taken when routing the power/serial communications cable (if the standard coil wired
version is used). To ensure that the signal cable is installed properly and away from situations that could cause it
harm use the following steps.
1. Mount the indicator to the forklift per instructions in Section 3.1.
2. Lay the coiled up signal cable along the route between the indicator and the forklift scale.
Figure 3-6. Power/Serial Communications Cable
Note Thepreferredrouteisthroughthecenterofthemast.Ifithasathreestagemast,routealongsidethemastas
shown in Figure 3-7.