Benchmark CW-80B Series Supplemento

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

Specifications subject to change without notice.

April 1997

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.

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

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

17 18 19

22 21

Section AA (Enlarged)

Section BB (Enlarged)

910 11 13

TOP VIEW OF SCALE

WITH COVER REMOVED

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

12" x 12" Base Assembly Parts

TOP VIEW OF SCALE

WITH COVER REMOVED

17 18 19

22 21

Section AA (Enlarged)

Section BB (Enlarged)

910 11 13

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

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.

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

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