Benchmark CW-80B Series Supplement

BenchMark™
CW-80BSeriesBenchScales
Installation/Service
Manual
40543

Contents
Installation............................................................................................................................................ 1
Leveling................................................................................................................................................. 1
Grounding ............................................................................................................................................. 1
Load Cell Wiring and Specifications...................................................................................................... 1
Troubleshooting .................................................................................................................................... 2
Load Cell Replacement ........................................................................................................................ 3
10" x 10" Base Assembly Parts ........................................................................................................... 4
12" x 12" Base Assembly Parts ........................................................................................................... 5
BenchMark™ CW-80B Limited Warranty ............................................................................................ 6
Copyright ©1997 Rice Lake Weighing Systems. All rights reserved. Printed in the United States of America.
Specifications subject to change without notice.
April 1997

1
Installation
Remove the scale from the shipping container and place it in the desired location. Select a location for the
CW-80B that is reasonably level and free of unnecessary vibrations and air currents.
Leveling
Remove the scale platter and locate the bubble level.
Adjust the four corner feet on the base until the bubble
level on the inside frame of the unit reads level. When
level, the base should not rock and all four feet should
have solid contact with the support surface. If using a
column with the scale, adjust the two column feet until
they make solid contact with the support surface.
Grounding
Bench scales can build up a charge of 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 should be
grounded so that static charges and transient electrical surges can drain directly to ground.
A chassis ground screw is located on the bottom of the platform (number 26 on the parts diagrams shown on
pages 5 and 6) 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.
Load Cell Wiring and Specifications
Use the wiring code shown in Table 1 when connecting the CW-80B bench scale to your indicator. Refer to
the indicator manual for information about indicator connections and calibration.
Table 1. RL1380 load cell wiring code
roloC noitcnuF
neerGnoitaticxE+
kcalBnoitaticxE–
etihWlangiS+
deRlangiS–
wolleYdleihS
Full scale output: 2.0 mv/V
Bridge resistance: 350 Ω
Material: Stainless steel
Temperature: 14°F – 104°F / –10°C to 40°C
(compensated range)
Safe overload: 150% full scale
Rated excitation: 10V AC/DC (15V maximum)
Combined error: 0.03% full scale
Insulation resistance: 1000 MΩ
Seal type: Environmentally protected
Cable length: 10 ft / 3m
RL1380 load cell specifications:
!Caution
Do not lift the scale by the spider assembly
that supports the platter. Lifting by the
spider can damage the load cell. Always lift
under the base when moving the scale.

2
motpmyS esuaCelbaborP ydemeR
yalpsidoNdetcennocsidrewoPrewoptcennoC
detcennocsidrotucelbaCelbactcennocerroriapeR
rotacidnitaderiwyltcerrocnisdaellangiS launamrotacidniotgnidroccatcennoC
oreztasyatsyalpsiDsnoitcennocelbacllecdaoltcerrocnIlaunamotgnidroccatcennoC
rotacidniytluaFrotacidniecivreS
yalpsidthgiewcitarrEelacsraennoitarbiV fognigarevalatigidtsujdaro,noitarbivfoecruosevomeR
yalpsidthgiewcitarreeziminimotrotacidni
leveltonelacSelacsleveL
elbacrollecdaolotegamadretaWllecdaolecalpeR
rotacidniytluaFrotacidniecivreS
swercsllecdaolesooLeuqrottcerrocotnethgiT
llecdaolytluaF yrassecenfillecdaolecalperdnatseT
sthgiewwolyltnetsisnoCorezotdetsujdaylreporptonrotacidnIyltcerrocrotacidnioreZ
gnidnibrevockcedelacSecnaraelcetauqedaniatbO
hgihoottesspotsdaolrevOyltcerrocspotsteseR
elacsrofdetarbilactonrotacidnIetarbilaC
llecdaolytluaF yrassecenfillecdaolecalperdnatseT
Troubleshooting

3
Load Cell Replacement
1. Unplug AC power from indicator and disconnect load cell cable from indicator’s terminal connection
strip.
2. Lift off scale top cover. Locate two upper load cell screws. Use 7/16" wrench to unscrew and remove
those two load cell screws. Do not remove four spring-loaded screws that attach load plate to spider
assembly. Lift off load plate/spider assembly as a unit. Remove spacer between load plate and load
cell and set it aside.
3. Turn scale over and back off Over-
load Protection Screw one complete
turn. Completely unscrew and
remove the Lift up Protection Screw.
4. Use 7/16" wrench to unscrew and
remove two lower load cell screws.
The load cell and cable can now be
removed from scale. Do not lose
shim beneath load cell.
5. Thread cable of replacement load
cell through rubber grommet.
Position load cell on shim and screw
in two lower load cell screws.
Torque to 80 in. lbs.
6. Replace Lift up Protection Screw by screwing it in until it lightly bottoms, then back it off 1/4 turn.
7. Turn scale right side up. Position spacer on load cell, then place load plate/spider unit into position.
Screw in two upper load cell screws. Torque to 80 in/lbs.
8. Use an accurate
caliper to check
compressed spring
length of the four
overload springs as
shown in Figure 2. If
necessary, adjust
length to specifica-
tions in Table 2.
Replace top cover and
re-level scale.
9. Connect load cell cable to correct pins on indicator terminal strip.
10. Tighten cord grip where cable enters indicator head. Reassemble indicator enclosure if required.
11. Recalibrate scale according to calibration instructions for the attached indicator.
12. Adjust Overload Protection Screw on bottom of scale by loading scale to 125% capacity. Place this
weight on top cover, centered on platform. With appropriate size hex wrench, screw in Overload
Protection Screw until it touches load cell, then back it off 1/6 turn. Recheck calibration.
Lift up
Protection
Screw
Overload
Protection
Screw Load Cell Screw
Load Cell Screw Top Sub-Assembly
Load Plate / Spider
Top Cover
Figure 1. CW-80B load cell mounting
mroftalP yticapaC "H"thgieHgnirpS
01x01)gK3(bl6"00.1
)gK5(bl01"49.0
)gK7(bl51"40.1
)gK51(bl03"34.1
21x21)gK51(bl03"34.1
)gK03(bl06"39.0
Table 2. Overload spring height values
H ±.02
Figure 2. Overload spring
height adjustment

4
17 18 19
20
22 21
25
26
23
24
Section AA (Enlarged)
27
Section BB (Enlarged)
1
2
3
4
5
6
7
8
910 11 13
14
15
16
28
TOP VIEW OF SCALE
WITH COVER REMOVED
A
A
B
B
12
10" x 10" Base Assembly Parts
Ref Part # Description
1 35087 ......Screw, pull protection, 1/4-20 NC x 1/2, SS (6-15 lb only)
2 14920 ......Screw, overload protection, 8-32 UNC x 1/4, SS
3 35128 ......Foot, 1/4-20 NC
4 14645 ......Jam nut, foot
5 19086 ......Bottom subassembly
6 15220 ......Rivet, sealing
7 16907 ......Label, bench scale
8 19091 ......Cover, top, 10" x 10"
9 19088 ......Spider, top
10 35088 ......Screw, load cell, top
11 15148 ......Washer, locking
12 15410 ......Spirit level bubble, plastic
13 30783 ......Load cell, RL1380 (6 lb model)
13 30782 ......Load cell, RL1380 (10 lb model)
13 30781 ......Load cell, RL1380 (15 lb model)
13 30780 ......Load cell, RL1380 (30 lb model)
14 14857 ......Screw, pan head
15 15132 ......Washer, locking, #8SS
16 15408 ......Grommet, rubber, 3/16 ID x 7/16 OD
17 14984 ......Bolt, overload spring (6-15 lb models)
17 21947 ......Bolt, overload spring (30 lb model)
18 21945 ......Spring, overload (6 lb model)
18 15416 ......Spring, overload (10 lb model)
18 21946 ......Spring, overload (15 lb model)
18 21944 ......Spring, overload (30 lb model)
Ref Part # Description
19 15149 ......Washer, flat, 1/4 Type A, SS
20 14634 ......Nut, nylon insert, 1/4-20 UNC, SS
21 35082 ......Shim, load cell, bottom, SS
22 15409 ......Clamp, nylon cable
23 19090 ......Load plate
24 15150 ......Washer, rubber
25 15138 ......Washer #8SS
26 14862 ......Screw, cable clamp
27 30909 ......Shim, load cell, top, SS
28 14956 ......Screw, load cell, bottom, SS

5
12" x 12" Base Assembly Parts
TOP VIEW OF SCALE
WITH COVER REMOVED
A
A
B
B
12
17 18 19
20
22 21
25
26
23
24
Section AA (Enlarged)
27
Section BB (Enlarged)
2
3
4
5
6
7
8
910 11 13
14
15
16
28
Ref Part # Description
2 14920 ......Screw, overload protection, 8-32 UNC x 1/4, SS
3 35128 ......Foot assembly
4 14645 ......Jam nut, foot
5 35066 ......Bottom subassembly
6 15220 ......Rivet, sealing
7 16907 ......Label, bench scale
8 35069 ......Cover, top, 12" x 12"
9 35068 ......Spider, top
10 35088 ......Screw, load cell, top
11 15148 ......Washer, locking
12 15410 ......Spirit level bubble, plastic
13 30780 ......Load cell, RL1380 (30 lb model)
13 30779 ......Load cell, RL1380 (60 lb model)
14 14857 ......Screw, pan head
15 15132 ......Washer, locking, #8SS
16 15408 ......Grommet, rubber, 3/16" ID x 7/16" OD
17 21947 ......Bolt, overload spring (30 lb model)
17 14984 ......Bolt, overload spring (60 lb model)
18 21944 ......Spring, overload (30 lb model)
18 35086 ......Spring, overload (60 lb model)
19 15149 ......Washer, flat, 1/4 Type A, SS
Ref Part # Description
20 14634 ......Nut, nylon insert, 1/4-20 UNC, SS
21 35082 ......Shim, load cell, bottom, SS
22 15409 ......Clamp, nylon cable
23 35067 ......Load plate
24 15150 ......Washer, rubber
25 15138 ......Washer #8SS
26 14862 ......Screw, cable clamp
27 30909 ......Shim, load cell, top, SS
28 14956 ......Screw, load cell, bottom, SS

6
BenchMark™CW-80B 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 one year.
RLWS warrants that the equipment sold hereunder will conform to the current written specifications autho-
rized 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 re-
turned 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.
•RLWSwillhaveareasonabletimetorepairorreplacethedefectiveequipment.Buyerisresponsibleforshipping 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 WAR-
RANTY, 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.
© 1997 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