Rice Lake CW-90B, CW-90XB Installation & Service Manual

Bench Scale

CW-90B/90XB

Installation & Service

Manual

155605

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

© Rice Lake Weighing Systems. All rights reserved. Printed in United States of America.

Rice Lake Weighing Systems is an ISO 9001 registered company.

Specifications subject to change without notice.

November 19, 2014

i

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.

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

The CW-90B comes with an aluminum environmentally sealed loa
The CW-90XB comes with a stainless steel and

hermetically sealed IP69K load cell.

lb (2.5 to 50 kg). The light capacity scales

d cell.

1.1 CW-90B/90XB Bench Scale Specifications

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

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°

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

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

.

C)

Introduction 1

1. 2 S a fe t y

WARNING

Important

WARNING

Safety Symbol Definitions:

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. Cont
responsibility.

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

DO NOT use this product if any of the

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.

act any Rice Lake Weighing Systems dealer for replacement manuals. Proper care is your

Failure to heed may result in serious injury or death.

worn beyond 5% of the original dimension.

components are cracked.

2 CW90B/90XB Bench Scale Installation Manual

2.0 Installation

Scale top

Level bubble
location

Jam nuts on scale
feet

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).

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.

Installation 3

2.3 Connecting the Load Cell Cable

Important

The CW-90B and CW-90XB come with a sta n da rd 10 foot or 34 inch color-coded load cell cable.
See your indicator manual to determine the prope

Do not cut the load cell cable. The load cell cable is tem

r load cell cable input connectors.

perature 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
used to facilitate grounding. Use a ground wire of at least 18 gauge copper
ground as the attached indicator.

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

to connect this screw to the same earth

4 CW90B/90XB Bench Scale Installation Manual

3.0 Calibration

Note

See your indicator manual for specific indica

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.

tor calibration procedures.

Calibration 5

4.0 Troubleshooting

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

ital averaging of the indicator to minimize

dig
the erratic display

Scale is not level Level the scale

Water damage to the load cell or load cell

ble

ca

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

Replace the load cell

Table 4-1. Troubleshooting Guide

6 CW90B/90XB Bench Scale Installation Manual

5.0 Load Cell Replacement

Top Co v e r

Upper load cell
screws and
washers

Spider Plate

Overload
stop screws

Upper spacer

Removing a Load Cell

1. Unplug AC power from the indicator and disconnect the load cell cable from the indicator.

2. Remove the scale top cover.

3. Use a 1/2" wrench to remove the

Figure 5-1. Remove Scale Top and Upper Load Cell Screws

4. Remove the scale’s spider plate.

5. Remove the upper spacer and set it aside.

6. Loosen the four overload stop scre
new load cell.

upper load cell screws.

ws and turn each screw in one turn to provide ample clearance for the

Figure 5-2. Remove Spider Plate and Upper Spacer

Load Cell Replacement 7

7. Turn the scale over and back off the overload protection screw one complete turn to provide clearance.

Bottom View

Bottom load
cell screws
and washers

Overload
protection screw

Load Cell

Load cell shim

Note

Note

Note

8. Remove the lower load cell screws.

9. Carefully turn the base plate upright to remove the loa

Figure 5-3. Remove Lower Load Cell Screws and Load Cell

Installing a Load Cell

Reference figures in “Removing a Load Cell,” on page 7, reversing steps, when reinstalling load cell.

d cell and cable from the scale. Discard load cell.

1. Retrieve the bottom shim and align it, with the new load cell, to the scale base.

2. Holding the load cell and shim in place

, carefully turn the scale over and secure to base plate using lower

load cell screws and washers.

Torque bolts to 200 in-lbs.

3. Turn the scale upright. Position the spacer plate on the load cell, then place the top frame into position.

4. Screw in the upper load cell screws.

Torque bolts to 200 in-lbs.

5. Connect the load cell cable to the indicator.

6. Recalibrate the scale as described in Section 3.0 on page 5 of this manual.

7. Adjust the load cell overload

protection screws on the bottom of the scale by loading the scale to 125%
capacity. Place this weight on the top cover, centered on the platform. Use a hex wrench to screw in the
load cell overload protection screw until it touches the load cell, the back off 1/6 turn.

8. Recheck calibration.

9. To reset corner overload stop screws, load the top s

pider over one corner with approximately 30% of scale

capacity.

10. Adjust the screw under that corner to just t

11. Place a drop of a non-permanent, high-strength locking compound such as

ouch the top frame.

Loctite® on the thread.

12. Back screw off slightly so it is not touching the top frame.

13. Repeat for each corner.

14. Replace the top cover and re-level the scale if necessary.

Loctite is a registered trademark of Henkel Corporation, U.S.A.

8 CW90B/90XB Bench Scale Installation Manual

6.0 Replacement Parts

1

12

11

4

3

2

6

9

3

13

10

15

12

11

8

7

5

Figure 6-1. CW-90B/90XB Bench Scale Assembly Parts Illustration

Item No. Description Qty.

1 Top Co v e r 1

2 Spider Plate 1

3 Nut, 1/4-20NC 8

4 Screw Cap, 1/4 -20NC, Hex Head 4

5 Load Cell 1

6 Base Plate 1

7 Screw, 8-32NC x 3/16 1

8 Label Roll, 4.00" x .25" 1

9 Foot, 1/4 - 20NC 4

10 Load Cell Shim 1

11 Regular Lock Washer 4

12 Hex Screw Cap, 1/4 - 20NC x 1" 2

13 Bubble Level 1

14 Screw Cap, 1/4 - 20NC x 3/4" 2

15 Load Cell Shim 1

Replacement Parts 9

CW-90B/90XB Bench Scale Limited Warranty

Rice Lake Weighing Systems (RLWS) warrants that all RLWS equipment and systems properly installed by a
Distributor or Original Equipment Manufacturer (OEM) will operate per written specifications as confirmed by the
Distributor/OEM and accepted by RLWS. All systems and components are warranted against defects in materials
and workmanship for two years for the CW-90B and three years for the CW -90XB.

RLWS warrants that the equipment sold hereunder will conform to the current written specifications authorized by
RLWS. RLWS warrants the equipment against faulty workmanship and defective materials. If any equipment fails
to conform to these warranties, RLWS will, at its option, repair or replace such goods returned within the warranty
period subject to the following conditions:

• Upon discovery by Buyer of such nonconformity, RLWS will be given prompt written notice with a
detailed explanation of the alleged deficiencies.

• Individual electronic components returned to RLWS for warranty purposes must be packaged to
prevent electrostatic discharge (ESD) damage in shipment. Packaging requirements a re listed in a
publication, Protecting Your Components From Static Damage in Shipment, available from RLWS
Equipment Return Department.

• Examination of such equipment by RLWS confirms that the nonconformity actually exists, and was
not caused by accident, misuse, neglect, alteration, improper installation, improper repair or improper
testing; RLWS shall be the sole judge of all alleged non-conformities.

• Such equipment has not been modified, altered, or changed by any person other than RLWS or its duly
authorized repair agents.

• RLWS will have a reasonable time to repair or replace the defective equipment. Buyer is responsible
for shipping charges both ways.

• In no event will RLWS be responsible for travel time or on-location repairs, including assembly or
disassembly of equipment, nor will RLWS be liable for the cost of any repairs made by others.

THESE WARRANTIES EXCLUDE ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING WITHOUT

LIMITATION WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. NEITHER RLWS
NOR DISTRIBUTOR WILL, IN ANY EVENT, BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES.

RLWS AND BUYER AGREE THAT RL WS’S SOLE AND EXCLUSIVE LIABILITY HEREUNDER IS LIMITED TO REPAIR

OR REPLACEMENT OF SUCH GOODS. IN ACCEPTING THIS WARRANTY, THE BUYER WAIVES ANY AND ALL OTHER
CLAIMS TO WARRANTY.

SHOULD THE SELLER BE OTHER THAN RLWS, THE BUYER AGREES TO LOOK ON LY TO THE SELLER FOR

WARRANTY CLAIMS.

NO TERMS, CONDITIONS, UNDERSTANDING, OR AGREEMENTS PURPORTING TO MODIFY THE TERMS OF THIS

WARRANTY SHALL HAVE ANY LEGAL EFFECT UNLESS MADE IN WRITING AND SIGNED BY A CORPORATE
OFFICER OF RLWS AND THE BUYER.

© Rice Lake Weighing Systems, Inc. Rice Lake, WI USA. All Rights Reserved.

RICE LAKE WEIGHING SYSTEMS • 230 WEST COLEMAN STREET • RICE LAKE, WISCONSIN 54868 • USA

10 CW90B/90XB Bench Scale Installation Manual

230 W. Coleman St. • Rice Lake, WI 54868 • USA

U.S. 800-472-6703 • Canada/Mexico 800-321-6703 • International 715-234-9171 • Europe [phone]

www.ricelake.com www.ricelake.mx www.ricelake.eu www.ricelake.co.in m.ricelake.com

© Rice Lake Weighing Systems 2014 PN 155605