TuffSeal®

Heavy Capacity Junction BoxJB8SP

Installation Manual

PN 174208 Rev A

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. Printed in the United States of America. Specifications subject to change without notice.

Rice Lake Weighing Systems is an ISO 9001 registered company.June 7, 2017

Technical training seminars are available through Rice Lake Weighing Systems.

Course descriptions and dates can be viewed at www.ricelake.com/trainingor obtained by calling 715-234-9171 and asking for the training department.

1.0 Introduction..................................................................................................................................... 11.1 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.2 Special Conditions of Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.0 TuffSeal Junction Box Installation ................................................................................................. 33.0 Wiring the Junction Box ................................................................................................................. 44.0 Trimming Procedure ....................................................................................................................... 6

Contents 1

Rice Lake continually offers web-based video training on a growing selection

of product-related topics at no cost. Visit www.ricelake.com/webinars

2 TuffSeal Heavy Capacity Junction Box

1.0 IntroductionThe TuffSeal® eight-channel signal trim junction box can accommodate up to eight load cells and is used in NTEP required truck scale installations. Additional load cells can be accommodated by wiring multiple junction boxes using the expansion terminal located on the main board.

The junction box has a Prevent® breather vent which inhibits the buildup of pressure caused by sudden temperature or environmental changes. The breather vent inhibits the buildup of pressure caused by sudden temperature or environmental changes. It should be changed every six months to a year as it will become dirty over time. When correctly installed and torqued to 10 lb/in, all models can withstand 900 PSI water pressure.

The TuffSeal junction box will function properly without modification. If needed, load cell output can be individually trimmed with potentiometers. For more information, see Section 4.0 on page 6.

Manuals can be viewed or downloaded from the Rice Lake Weighing Systems website at www.ricelake.com/manuals

Warranty information can be found on the website at www.ricelake.com/warranties

Figure 1-1. TuffSeal Truck Scale Junction Box

Introduction 1

1.1 SafetySafety 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 may result in serious injury or death.

Do not install where water may accumulate; this could cause electric shock and damage to the unit.

Do not use if wiring is frayed or worn.

Do not use if the cover is off or the unit has not been sealed properly.

Do not place fingers into slots or possible pinch points.

Do not use this product if any of the components are cracked.

Do not make alterations or modifications to the unit.

Do not remove or obscure warning labels.

Ensure load cells are correctly wired; incorrect wiring could cause damage to the unit.

1.2 Special Conditions of Use• Clean the J-Box enclosure with a damp cloth only - Electrostatic Charging Hazard.• This equipment was examined and approved for connection to a single Indicator only.

DANGER

WARNING

CAUTION

Important

WARNING

2 TuffSeal Heavy Capacity Junction Box

TuffSeal Junction Box Installation 3

2.0 TuffSeal Junction Box InstallationThe TuffSeal junction box should be mounted in a location that is convenient for servicing and away from standing water. Mount the enclosure in a location so that the load cell cable need not be cut, nor length added. Load cell output is temperature compensated for the supplied cable length; altering the cable length can change the cell's signal output.

Depending on the mounting surface, the enclosure is attached using four pan-head screws, bolts or other suitable fasteners (not included). Figure 2-1 shows the dimensions for mounting the enclosure.

Figure 2-1. JB8SP Enclosure Dimensions

10.75"

11.50"

8.25"6.00"

5.25"

(8) 3/8" NPT Cord Grips - Cable Diameter 0.157" - 0.314"(2) 1/2" NPT Cord Grips - Cable Diameter 0.272" - 0.472"

Recommended screw size 1/4 - 20NC

With reducing glands, the cable diameter changes to 0.295” - 0.353”.Note

3.0 Wiring the Junction BoxThe TuffSeal junction box is designed to connect and trim up to eight load cells per board. However, it is possible to use this box with two, four, six and eight load cell combinations. Use the expansion port on the main board to connect multiple junction boxes in series to accommodate applications having ten or more load cells.

Figure 3-1. Expansion Port Wiring Location

1. Determine the wiring pattern, then route the load cell cables through the cord grip assemblies. Leave the grips loose until final closure.

2. Strip the wire insulation back 1/4" to expose the wire. The pluggable connector will accommodate 12 to 28 gauge wire.

3. Open each pole with a small screwdriver and insert the appropriate wire into the exposed wire opening.

4. Tighten the end screw with the screwdriver to secure each wire into place.

5. Plug the terminal to the appropriate header socket.

The indicator terminal is used to connect the main cable to the weight indicator. Determine the indicator's load cell input connections from the indicator manual.

R29

R15

R27

WSR2

J8

W6

W1

1

Pb

J7

R47

R18

R36

MH5

WSR1

TH1

R13

TH2

J4

U7

R2

R28

R12

MH9

JP17

JP10

U10

R20

R44

R41

TH4

R33

W15

W18

W8

W20

W9

W14

W13

W3

W21

NUT2

R46

R32

R16

R25

R35

J1

JP18

JP1

6

U2

U8

R31

R5

R43

R17

R8

JP9

R23

J6

W7

JP6

JP12R30W17

R48

R38

J5

W12

W19

W2

W5

W4

W10

NUT1

BOLT1

R52

RICE LAKE

MH6

U11

JP15

R45

U5

R50

R14

JP7

R10

R3

R7

U1

U12

JP19 JP14

R21

R9

JP1

1

U3

JP13

U9

R26

R37

R34

JP8

U4

R40

J3

R51

R22

R19

U6

ASSYPN/Rev

W1

6

R4

JP20

R42

R24

J2

R1

JP21

R11

R39

R6

R49

BOARD

MH7

JP1

JP2

JP5

W1

MH8

JP3

JP4

TH3

EXPANSION/J9

-EX

+EX

+SI

-SI

+SEN

SHD

-SEN

JMP/NEGJMP/POS

INDICATOR/J10

-EX

+SI

-SI

+SEN

SHD

+EX

-SEN

W22

JP22

MH7

MH8

TH3

EXPANSION/J9

-EX

+EX

+SI

-SI

+SEN

SHD

-SEN

INDICATOR/J10

-EX

+SI

-SI

+SEN

SHD

+EX

-SEN

MH9

W21

JP21

JMP/NEGJMP/POS

W22

JP22

Note

4 TuffSeal Heavy Capacity Junction Box

6. Run a cable from the indicator terminal into the junction box through the larger cord grip.

7. Make the connections on the indicator terminal using the same procedure as inserting load cell cables to the appropriate connectors.

If cables could be exposed to water or other liquids, bend a short downward loop in all cables near the cord grips so any fluids draining down the cables will drip off before reaching the junction box.

Figure 3-2. Drip Loop Cable

Note

Wiring the Junction Box 5

4.0 Trimming ProcedureTrimming is a process of equalizing the output from multiple individual load cells. If needed, load cell output can be individually trimmed with potentiometers.

When a substantial amount of trim (more than 7% of normal output), is necessary to equalize output, check for other possible problems. The best trim is always the least amount of trim.

The JB8SP is a signal trimming device with individual and section trimming potentiometers (see Figure 4-1 on page 7).

Use the following steps to properly trim the JB8SP junction box.

If using two junction boxes with an expansion cable between them, make sure to cut the sense trace on the board that has the homerun cable connected to it (see Figure 4-1 on page 7). This ensures sensing out to the furthest junction box within the system. A six conductor cable must be used between the two junction boxes to ensure proper functioning of sense.

1. Determine the number of load cells needed. When section trimming, it is acceptable to use combinations of load cells other than eight, but the combination must be an even number of cells.

2. Turn all the individual cell and section potentiometers clockwise to give maximum signal output from each section. Remove all shunt jumpers of the individual cells that are not used to disable them and ensure the section potentiometer is turned fully.

If desired, all the potentiometers can be adjusted three to five full turns counter-clockwise to allow trim capabilities both positive and negative.

3. Determine the lowest value and turn the potentiometers counter-clockwise to trim all other values to match the lowest value.

4. Remove all weight from the scale and zero the indicator. Place calibrated test weights over each load cell or section. The amount of test weights to be used will depend on the scale configuration. For specific recommendations, refer to the Handbook 44, published by the National Institute of Standards and Technology (NIST).

5. Record the value displayed on the indicator after the test weight is placed in turn over each load cell, or over each section. Select the load cell or section that has the lowest value as the reference point. This load cell or section will not be trimmed.

6. Place the same test load over each cell or section in turn. Using the corresponding potentiometer, trim each cell or section down to equal the reference point. Check zero after every adjustment to avoid zero shift, as load cell corrections are interactive.

7. Check load cells or sections again and repeat steps 6-8 as needed.

Note

Note

6 TuffSeal Heavy Capacity Junction Box

Figure 4-1. Shunt Locations

8. Pull excess cable out of the enclosure.

9. Using a wrench, tighten the nut until the rubber touches the cable completely.

10. Tighten the nut an additional half turn (180º). To be watertight, each cord grip must be tightened so the rubber sleeve begins to protrude from the hub.

Unused hubs must be properly plugged to prevent moisture entry. Extra hole plugs are provided to seal up any unused hubs.

11. Remove the desiccant from the plastic bag, and insert the desiccant bag into the junction box before closing. Inspect the desiccant during normal service and change as needed.

12. Replace the cover and torque the cover screws in an alternating pattern to 15 in-lb to be certain the gasket is compressed equally in all locations.

JP

TRIM

TRIM

-EX

+EX

+SI

-EX

+EX

+SI

-EX

+EX

1

+SI

-EX

+EX

+SI

JP

JP

SIG

NA

L

SE

CT

#

EA

CH

UN

US

ED

SE

CT

ION

SIG

NA

L

CE

LL#

CE

LL#

CE

LL#

SHD

1

SHD

-SI

1

-SI

SHD

-SI

1

-SI

SHD

SIG

NA

L

SE

CT

#C

ELL#

CE

LL#

SIG

NA

LS

IGN

AL

SIG

NA

L

RIC

E L

AK

E W

EIG

HIN

G S

YS

TE

MS

CE

LL#

SE

CT

#C

ELL#

JP

-EX

+EX

+SI

-EX

+EX

+SI

JP

-EX

+EX

+SI

-EX

+EX

+SI

SE

CT

#

SIG

NA

L

TRIM

TRIM

TRIM

TRIM

TRIM

TRIM

Assembly

-EX

-EX

+EX

+SI

SHD

1

SHD

-SI

1

-SI

1

-SI

SHD

1

-SI

SHD

CONNECT BOTH SHUNTS

TO APPLY CELL SIGNAL

SIG

NA

LS

IGN

AL

SIG

NA

L

CE

LL#

PN Rev.

+SI

-SI

-SI

RE

MO

VE

SH

UN

T T

O D

ISC

ON

NE

CT

SE

CT

#

TURN POT CLOCKWISE FOR MAXIMUM SIGNAL

+SEN

SHD

+SEN

SHD

DISCONNECT BOTH SHUNTS

TO REMOVE CELL SIGNAL

+EX

-SEN

-SEN

R46

R41

R20

JP17

JP7

JP

16

R52

R50

R40

R24

R14

R15

JP20

JP10

JP

11

R26

JP

6

JP

1

R51

R49

R47

R45

R43

JP9

R23

R21

JP8

R17

R38

R36

R34

R33

R32

R30

R28

R10

R8

R7

R4

R2

JP12

JP2

VR

9

JP19R48

VR

7

JP18

R42

R44

R22

R25

R16

R18

VR

2

R19

R39

VR

10

R35

R37

VR

11

R27

R29

R31

R9

R11

R12

R1

R3

R5

VR

5

R6

JP5

VR

8

VR

3

VR

1

VR

12

VR

6

J1

VR

4

J2 R13

EXPANSION/J9

J5

JP4

JP3

JP14

JP15

JP13

J8

J4

J3

J6

J7

INDICATOR/J10

JP

TRIM

-EX

+EX

JP

JP

SIG

NA

L

SHD

SIG

NA

L

SIG

NA

L

CE

LL#

JP

-EX

+EX

TRIM

SHD

CONNECT BOTH SHUNTS

TO APPLY CELL SIGNAL

SIG

NA

L

CE

LL#

DISCONNECT BOTH SHUNTS

TO REMOVE CELL SIGNAL

R52

R50 JP20

R51

R49

R38

R36

R39

R37

VR

8

VR

12

JP15

J8 J6

W21

JP21

JMP/NEGJMP/POS

W22

JP22

WSR2

WSR1

MH9NUT2

NUT1

BOLT1

BOARD

Note

Trimming Procedure 7

8 TuffSeal Heavy Capacity Junction Box

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

U.S. 800-472-6703 • Canada/Mexico 800-321-6703 • International 715-234-9171 • Europe +31 (0)26 472 1319

Rice Lake Weighing Systems is an ISO 9001 registered company.

© Rice Lake Weighing Systems Specifications subject to change without notice.

www.ricelake.com

June 7, 2017 PN 174208 Rev A