Rice Lake CW-90B Supplement

155605

Bench Scale

CW-90B/90XB

Installation & Service

Manual

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.

Contents

1.0 Introduction.................................................................................................................................. 1

1.1 CW-90B/90XB Bench Scale Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.0 Installation ................................................................................................................................... 3

2.1 Unpacking Your Scale. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.2 Leveling the Scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.3 Connecting the Load Cell Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.4 Grounding the Scale Base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3.0 Calibration ................................................................................................................................... 5

4.0 Troubleshooting ........................................................................................................................... 6

5.0 Load Cell Replacement................................................................................................................ 7

6.0 Replacement Parts ..................................................................................................................... 9

CW-90B/90XB Bench Scale Limited Warranty ...................................................................................... 10

Specifications subject to change without notice.

Rice Lake Weighing Systems is an ISO 9001 registered company.

November 19, 2014

ii CW90B/90XB Bench Scale 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.

Introduction 1

1.0 Introduction

This manual provides reference information to install and wire the CW-90B/90XB bench scale which is shown in

Figure 1-1.

Figure 1-1. CW-90B/90XB Bench Scale

The CW-90B and CW-90XB are both NTEP-certified and available in a 10" x 10" (254 mm x 254 mm) and 

12" x 12" (304 mm x 304 mm) platform with capacities from 5 to 100 lb (2.5 to 50 kg). The light capacity scales

are constructed with 304 stainless steel to withstand many years of rugged use.

The CW-90B comes with an aluminum environmentally sealed load cell.

The CW-90XB comes with a stainless steel and hermetically sealed IP69K load cell.

1.1 CW-90B/90XB Bench Scale Specifications

Table 1-1 lists the CW-90B and CW-90XB model specifications

Table 1-1. 10" x 10" and 12" x 12" CW-90 Models

CW-90B CW-90XB

Load Cell Aluminum environmentally sealed IP69K Stainless steel

Overload Protection 5 point, independently adjusted

Cable Length 34 inch or 10 ft (3 m) - 6 wire shielded

Output Impendance 350

Maximum Overload 180 to 200% depending on capacity

Compensated Temperature Range 14°F to 104°F (-10°C to +40°C)

Dimensions/Capacities

Size Capacity Height

10" x 10"/254 mm x 254 mm 5, 10, and 25 lb/2.5, 5, and 12.5 kg 4.25"/108 mm

12" x 12"/304 mm x 304 mm 25, 50, and 100 lb/12.5, 25, and 50 kg 4.25"/108 mm

2CW90B/90XB Bench Scale Installation Manual

1.2 Safety

Safety Symbol Definitions:

WARNING

Important

WARNING

Indicates a potentially hazardous situation that, if not avoided could result in death or serious injury, and

includes hazards that are exposed when guards are removed.

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 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 or death.

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.

Installation 3

2.0 Installation

The following sections explain the installation procedure for the CW-90B and CW-90XB bench scales.

2.1 Unpacking Your Scale

Immediately after unpacking, visually inspect the scale to ensure that the unit is undamaged. The shipping carton

should contain the bench scale and this manual. If the bench scale was damaged in shipment, notify Rice Lake

Weighing Systems and the shipper immediately.

2.2 Leveling the Scale

Place the scale in the desired location that is reasonably level and free of unnecessary vibrations and air currents.

Lift off the scale platter and locate the level bubble (See Figure 2-1 for location).

Scale top

Level bubble

location

Jam nuts on scale

feet

Figure 2-1. Top Plate Removed Showing Bubble Level Location

Adjust the four corner feet on the base until the scale reads level and all feet contact the support surface so the scale

does not rock. Lock the jam nuts on the feet when the final level is correct.

4CW90B/90XB Bench Scale Installation Manual

2.3 Connecting the Load Cell Cable

The CW-90B and CW-90XB come with a standard 10 foot or 34 inch color-coded load cell cable.

See your indicator manual to determine the proper load cell cable input connectors.

Important

Do not cut the load cell cable. The load cell cable is temperature compensated for an exact cable length.

2.4 Grounding the Scale Base

Scale bases can build up static electricity during weighing operations. If powerful enough, this charge can travel

through the load cell cable to the indicator. To prevent this, all bench scales attached to indicators by just a load cell

cable should be adequately grounded to discharge static and transient electrical surges.

A chassis ground screw is located on the bottom of the platform. Item 7 in Figure 6-1 is an 8-32 NCx3/16 screw

used to facilitate grounding. Use a ground wire of at least 18 gauge copper to connect this screw to the same earth

ground as the attached indicator.

Calibration 5

3.0 Calibration

Note

See your indicator manual for specific indicator calibration procedures.

It is recommended that the scale be “exercised” by loading it with test weights. Do this two or three times before

calibrating to make sure that the scale is seated. To calibrate the CW-90B/90XB scale, place test weights on the

scale platform equal to 70 - 100% of the scale’s capacity. If several weights are used, distribute them evenly around

the platform.

6CW90B/90XB Bench Scale Installation Manual

4.0 Troubleshooting

Table 4-1. Troubleshooting Guide

Symptom Probable Cause Remedy

No display Power disconnected Connect power

Cable cut or disconnected Repair cable

Signal leads incorrectly wired at indicator Connect according to indicator manual

Display stays at zero Incorrect load cell cable connections Connect according to manual

Faulty indicator Service the indicator

Erratic weight display Vibration near the scale Remove the source of vibration, or adjust the

digital averaging of the indicator to minimize

the erratic display

Scale is not level Level the scale

Water damage to the load cell or load cell

cable

Replace the load cell

Faulty indicator Service the indicator

Loose load cell screws Tighten the correct torque

Faulty load cell Test and replace if necessary

Consistently low weights Indicator is not properly adjusted to zero Zero the indicator correctly

Scale deck cover is binding Obtain adequate clearance

Overload stops set too high Reset overload stops correctly

Indicator not calibrated for scale Calibrate

Faulty load cell Test and replace if necessary

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