Rice Lake CW-90B User manual

CW-90B and CW-90XB
Light-Capacity Bench Scales
Technical Manual
PN 200153 Rev AMay 19, 2020

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
© Rice Lake Weighing Systems ● All Rights Reserved i
Contents
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.
1.0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2.1 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2.2 Leveling the Scale. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2.3 Connecting the Load Cell Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2.4 Grounding the Scale Base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.5 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.6 Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.0 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.4 Load Cell Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.5 Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.0 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

BenchMark CW-90B and CW-90XB
ii Visit our website www.RiceLake.com
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
© Rice Lake Weighing Systems ● All Rights Reserved 1
1.0 Introduction
This manual provides reference information to install and wire the CW-90B and CW-90XB Light-Capacity Bench Scales.
Manuals and additional resources are available from the Rice Lake Weighing Systems website at www.ricelake.com
Warranty information can be found on the website at www.ricelake.com/warranties
1.1 Safety
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 could 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.
Before opening the unit, ensure the power cord is disconnected from the outlet.
Keep hands, feet and loose clothing away from moving parts.
DANGER
WARNING
CAUTION
IMPORTANT
WARNING

BenchMark CW-90B and CW-90XB
2 Visit our website www.RiceLake.com
2.0 Installation
This section provides an overview of the CW-90B and CW-90XB installation procedure and grounding information.
2.1 Unpacking
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
1. Place the scale in the desired location that is reasonably level and free of unnecessary vibrations and air currents.
2. Lift off the scale top cover and locate the level bubble.
3. Adjust the four corner feet on the scale base until the level bubble and all feet contact the support surface so the scale
does not rock.
4. Lock the jam nuts on the feet when the final level is correct.
2.3 Connecting the Load Cell Cable
All models come with 10' or 34'' color-coded load cell cable.
Do not cut this cable. Cutting this cable voids the warranty.
See the indicator manual to determine the proper load cell cable input connectors. Use the following color codes to
wire the load cell cable to the indicator.
Connect Sense and Excitation wires together if using 4-wire system without sense leads.
IMPORTANT
Note
Color Code Function
Green + Excitation
Black - Excitation
Blue + Sense
Brown - Sense
Red + Signal
White - Signal
Table 2-1. CW-90B Load Cell Wiring - 6 Wire
Color Code Function
Green + Sense
Black - Excitation
Blue + Excitation
Red - Signal
White + Signal
Grey - Sense
Table 2-2. CW-90XB Load Cell Wiring - 6 Wire
Note

Installation
© Rice Lake Weighing Systems ● All Rights Reserved 3
2.4 Grounding the Scale Base
The CW-90B and CW-90XB can build up static electricity charge during weighing operations. If powerful enough, the charge
can travel through the load cell cable to the indicator. The unit should be adequately grounded so static charges and transient
electrical surges can drain directly to the ground.
A chassis ground screw is located on the bottom of the platform. Within the replacement parts tables in Section 2.6 on page 4
the 8-32 NCx3/16 screw is 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.
2.5 Calibration
It is recommended that the scale be exercised by loading it to near capacity two or three times before calibration to ensure
everything is seated. See the specific indicator manual for the proper calibration procedure.
To calibrate, see the following procedure:
1. With no load on scale, place the indicator in its calibration mode and perform a zero calibration.
2. Place certified calibration weights on platform equal to 70%–100% of scale’s capacity. If several weights are used,
distribute them evenly around the platform.
3. Perform a calibration.
4. Remove certified calibration weights and check the zero reading. If necessary, repeat the calibration process.
See the indicator manual for the specific indicator calibration procedure.
Note

BenchMark CW-90B and CW-90XB
4 Visit our website www.RiceLake.com
2.6 Replacement Parts
See the following information for replacement parts details:
CW-90B and CW-90XB Bench Scales
Figure 2-1. Parts Illustration
1
12
2
711
8
15
9
11
10
3
614
5
4

Installation
© Rice Lake Weighing Systems ● All Rights Reserved 5
Item No. Part No. Description Qty.
1 107144 Top Cover, 10 x 10 1
2 107140 Spider Plate, 10 x 10 1
3 105555 Nut, 1/4-20NC 8
4 106462 Screw Cap, 1/4 -20NC, Hex Head 4
5 107756 Load Cell, SPT RL1040, 34'' Cable, 5 lb Scale CW-90B 1
107757 Load Cell, SPT RL1040, 34'' Cable, 10 lb Scale CW-90B
107758 Load Cell, SPT RL1040, 34'' Cable, 25 lb Scale CW-90B
32860 Load Cell, SPT RL1040, 10' Cable, 5 lb Scale CW-90B
32861 Load Cell, SPT RL1040, 10' Cable, 10 lb Scale CW-90B
32864 Load Cell, SPT RL1040, 10' Cable, 25 lb Scale CW-90B
6 105452 Base Plate, 10 x 10 1
7 45329 Screw, 8-32NC x 3/16 1
8 107476 Foot, 1/4 - 20NC 4
9 52383 Load Cell Shim .25 x 1 x 1.34 SST 1
10 15148 Washer, Lock 1/4 Regular 4
11 14963 Screw, Cap 1/4-20NC x 3/4 Hex Head SST 2
12 15410 Level, Spirit Bubble Plastic 1
13 21948 Screw, Cap 1/4-20NC x 5/9 Hex Head SST 2
14 35082 Shim, Load Cell .125 x 1 x 1.34 SST 1
15 163794 Cap, Screw 1/4-28NF x 1/2, Flat Head SST 1
Table 2-3. CW-90B 10' x 10' Parts List
Item No. Part No. Description Qty.
1 105457 Top Cover, 12 x 12 1
2 105450 Spider Plate, 12 x 12 1
3 105555 Nut, 1/4-20NC 8
4 106462 Screw Cap, 1/4 -20NC, Hex Head 4
5 107758 Load Cell, SPT RL1040, 34'' Cable, 25 lb Scale CW-90B 1
107759 Load Cell, SPT RL1040, 34'' Cable, 50 lb Scale CW-90B
107760 Load Cell, SPT RL1040, 34'' Cable, 100 lb Scale CW-90B
32864 Load Cell, SPT RL1040, 10' Cable, 25 lb Scale CW-90B
32865 Load Cell, SPT RL1040, 10' Cable, 50 lb Scale CW-90B
32866 Load Cell, SPT RL1040, 10' Cable, 100 lb Scale CW-90B
6 105452 Base Plate, 12 x 12 1
7 45329 Screw, 8-32NC x 3/16 1
8 107476 Foot, 1/4 - 20NC 4
9 52383 Load Cell Shim .25 x 1 x 1.34 SST 1
10 15148 Washer, Lock 1/4 Regular 4
11 14963 Screw, Cap 1/4-20NC x 3/4 Hex Head SST 2
12 15410 Level, Spirit Bubble Plastic 1
13 21948 Screw, Cap 1/4-20NC x 5/9 Hex Head SST 2
14 35082 Shim, Load Cell .125 x 1 x 1.34 SST 1
15 163794 Cap, Screw 1/4-28NF x 1/2, Flat Head SST 1
Table 2-4. CW-90B 12' x 12' Parts List

BenchMark CW-90B and CW-90XB
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Item No. Part No. Description Qty.
1 107144 Top Cover, 10 x 10 1
2 107140 Spider Plate, 10 x 10 1
3 105555 Nut, 1/4-20NC 8
4 106462 Screw Cap, 1/4 -20NC, Hex Head 4
5 107174 Load Cell, SPT RLPWM15HE, 34'' Cable, 5 lb and 10 lb Scales CW-90XB 1
107175 Load Cell, SPT RLPWM15HE, 34'' Cable, 25 lb Scale CW-90XB
108685 Load Cell, SPT RLPWM15HE, 10' Cable, 5 lb and 10 lb Scales CW-90XB
108686 Load Cell, SPT RLPWM15HE, 10' Cable, 25 lb Scale CW-90XB
6 105452 Base Plate, 10 x 10 1
7 45329 Screw, 8-32NC x 3/16 1
8 107476 Foot, 1/4 - 20NC 4
9 52383 Load Cell Shim .25 x 1 x 1.34 SST 1
10 15148 Washer, Lock 1/4 Regular 4
11 14963 Screw, Cap 1/4-20NC x 3/4 Hex Head SST 2
12 15410 Level, Spirit Bubble Plastic 1
13 21948 Screw, Cap 1/4-20NC x 5/9 Hex Head SST 2
14 35082 Shim, Load Cell .125 x 1 x 1.34 SST 1
15 163794 Cap, Screw 1/4-28NF x 1/2, Flat Head SST 1
Table 2-5. CW-90XB 10' x 10' Parts List
Item No. Part No. Description Qty.
1 105457 Top Cover, 12 x 12 1
2 105450 Spider Plate, 12 x 12 1
3 105555 Nut, 1/4-20NC 8
4 106462 Screw Cap, 1/4 -20NC, Hex Head 4
5 107175 Load Cell, SPT RLPWM15HE, 34'' Cable, 25 lb Scale CW-90XB 1
107176 Load Cell, SPT RLPWM15HE, 34'' Cable, 50 lb Scale CW-90XB
107177 Load Cell, SPT RLPWM15HE, 34'' Cable, 100 lb Scale CW-90XB
108686 Load Cell, SPT RLPWM15HE, 10' Cable, 25 lb Scale CW-90XB
108687 Load Cell, SPT RLPWM15HE, 10' Cable, 50 lb Scale CW-90XB
108688 Load Cell, SPT RLPWM15HE, 10' Cable, 100 lb Scale CW-90XB
6 105452 Base Plate, 12 x 12 1
7 45329 Screw, 8-32NC x 3/16 1
8 107476 Foot, 1/4 - 20NC 4
9 52383 Load Cell Shim .25 x 1 x 1.34 SST 1
10 15148 Washer, Lock 1/4 Regular 4
11 14963 Screw, Cap 1/4-20NC x 3/4 Hex Head SST 2
12 15410 Level, Spirit Bubble Plastic 1
13 21948 Screw, Cap 1/4-20NC x 5/9 Hex Head SST 2
14 35082 Shim, Load Cell .125 x 1 x 1.34 SST 1
15 163794 Cap, Screw 1/4-28NF x 1/2, Flat Head SST 1
Table 2-6. CW-90XB 12' x 12' Parts List

Appendix
© Rice Lake Weighing Systems ● All Rights Reserved 7
3.0 Appendix
This section provides additional information about the CW-90B and CW-90XB Bench Scales.
3.1 Options
Optional ball transfer, roller conveyor tops and custom height columns for attaching indicators to the scale are available.
Consult the factory for available options.
3.2 Troubleshooting
For troubleshooting details, see the following information:
3.3 Dimensions
For CW-90B and CW-90XB bench scale dimensions see the following information:
Figure 3-1. CW-90B and CW-90XB Dimensions
See Figure 3-1 for Table 3-2 dimension references.
Issue Cause Solution
No display on indicator Power disconnected Connect power
Cable cut or disconnected Repair cable
Signal leads incorrectly wired at indicator Connect according to the manual
Indicator display remains at zero Incorrect load cell cable connections Connect according to the manual
Faulty indicator Service indicator
Erratic weight displays
on indicator
Vibration near the scale Remove the source of the vibration or adjust digital filtering of
indicator to minimize erratic display
Scale not level Level the scale
Water damage to the load cell or cable Replace the load cell
Faulty indicator Service the indicator
Loose load cell screws Tighten to correct torque
Faulty load cell Test and replace if necessary
Consistently low weight Indicator not properly adjusted to zero Zero indicator correctly
Scale cover binding Obtain adequate clearance
Overload stops set too high Reset the stops correctly
Indicator not calibrated for scale Calibrate the scale
Faulty load cell Test and replace if necessary
Table 3-1. Troubleshooting
Capacity Product Dimensions (L x W x H) L1 x W1
5 lb (2.5 kg) 10'' x 10'' x 4.25''
(254 mm x 254 mm x 108 mm)
10.25'' x 10.25''
(260 mm x 260 mm)
10 lb (5 kg)
25 lb (12.5 kg)
25 lb (12.5 kg) 12'' x 12'' x 4.25''
(305 mm x 305 mm x 108 mm)
12.25'' x 12.25''
(311 mm x 311 mm)
50 lb (25 kg)
100 lb (50 kg)
Table 3-2. Dimensions and Capacities
H
L
L1
W
W1

BenchMark CW-90B and CW-90XB
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3.4 Load Cell Replacement
Use the following steps to replace load cells:
Figure 3-2. Load Cell Mount Diagram
1. Unplug AC power from indicator and disconnect load cell cable from indicator.
2. Lift off scale top cover.
3. Locate four upper load cell screws. Use a wrench to unscrew and remove the 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 screws and turn each screw in one turn to provide clearance for the new load cell.
7. Turn the scale over and back off the overload protection screw one complete turn to provide clearance.
8. Remove the lower load cell screws.
9. Carefully turn the base plate upright to remove the load cell and cable from the scale. Discard load cell.
Installing a Load Cell
Reference figures in Section 3.4. Reverse steps when reinstalling 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.
5. Connect the load cell cable to the indicator.
6. Recalibrate the scale (Section 2.5 on page 3).
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 spider over one corner with approximately 30% of scale capacity.
10. Adjust the screw under that corner to just touch the top frame.
11. Place a drop of a non-permanent, high-strength locking compound 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.
Load Cell Screw
Scale Top Cover Load Plate / Spider
Load Cell Screw Top Sub-Assembly
Note
Note

Appendix
© Rice Lake Weighing Systems ● All Rights Reserved 9
3.5 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 are 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 RLWS’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 only 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.

BenchMark CW-90B and CW-90XB
10 Visit our website www.RiceLake.com
4.0 Specifications
Load Cell
CW-90B IP67 aluminum and environmentally sealed
CW-90XB IP69k stainless steel and hermetically sealed
Available Sizes
10" x 10", 12" x 12"
Rated Output
0.91 mV/V
Maximum Overload
180 – 200% (capacity dependent)
Overload Protection
Five point, independently adjusted
Cable Length
10' (3 m)
Output Impedance
350 
Compensated Temperature Range
14° F – 104° F (-10° C – 40° C)
Safe Temperature Range
-22° F – 158° F (-30° C – 70° C)
Certifications and Approvals
CW-90B
NTEP
CoC 95-072
Accuracy Class III; 5000 d
Measurement Canada
AM-5082, Class III 5000 d
Load cell is cFMus approved
CW-90XB
NTEP
CoC 95-072
Accuracy Class III; 5000 d
Measurement Canada
AM-5082, Class III 5000 d
Load cell is FM approved

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]
Rice Lake Weighing Systems is an ISO 9001 registered company.
© Rice Lake Weighing Systems Specifications subject to change without notice.
www.ricelake.com
PN 200153 Rev AMay 19, 2020