Rice Lake CW-90B Supplement
155605
Bench Scale
CW-90B/90XB
Installation & Service
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.
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.
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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