RICE LAKE JB4SP TuffSeal Light Mid Range Capacity Junction Box Instruction Manual

RICE LAKE JB4SP TuffSeal Light Mid Range Capacity Junction Box

© 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.

Revision History

This section tracks and describes the current and previous manual revisions for awareness of major updates and when the updates took place.

184803
A| January 29, 2020| Revision history established after Rev A
B| June 7, 2022| Added information on new mid-range junction box
C| September 12, 2023| Added information on board installation

Table i. Revision Letter History

Introduction

The TuffSeal® series are excitation or signal trim junction boxes that can accommodate two, three or four load cells. Primarily used in floor and hopper scales, each model also can extend to more than four load cells using an excitation connector. All models have a new Prevent® breather vent, which inhibits the buildup of pressure caused by sudden temperature or environmental changes. It must be changed every six months to a year, it does become dirty over time. When correctly installed and torqued to 10 lb/in, all models can withstand 900 PSI water pressure. All terminals will function properly without modification. However, load cell output can be individually trimmed with potentiometers which is further explained in Section 4.0 of this manual.

NOTE:
The TuffSeal manual, part number 91909, has been updated to 184803 effective July 24, 2017.

• Manuals and additional resources are available on the Rice Lake Weighing Systems website at www.ricelake.com.
• Warranty information can be found on the website at www.ricelake.com/warranties.

Model Designations

• The TuffSeal junction box comes in several different models including stainless steel for the small junction box and an FRP enclosure for the mid-range junction box. Some models are FM Approved.
• Applications vary from use in floor scales to hoppers so selection can vary from a light to a mid-range capacity junction box.

Special Conditions of Use

WARNING:
Electrostatic Charging Hazard – Clean the junction box enclosure with a damp cloth only.

This equipment was examined and approved for connection to a single Indicator only.

Mounting Procedure

The TuffSeal junction boxes come in two sizes:

• 4-Channel small enclosure (JB4ES and JB4SS)
• 4-Channel mid-range FRP enclosure (JB4EP and JB4SP)

The junction boxes should be mounted in a location that is convenient for servicing and away from standing water. Mount the enclosure in a location that allows for the cable supplied, do not cut the cable.

IMPORTANT:
Load cell output is temperature compensated for the supplied cable length. Altering the length can change the cell’s signal output.

Small Junction Boxes (JB4ES and JB4SS)
Depending on the mounting surface, the JB4ES and JB4SS enclosure can be attached using two pan-head screws, bolts, or other suitable fasteners (not included).

Table 2-1. JB4ES and JB4SS Enclosures

Mid-Range Junction Boxes (JB4EP and JB4SP)
Depending on the mounting surface, the JB4EP and JB4SP enclosure can be attached using four pan-head screws, bolts or other suitable masonry fasteners.

Table 2-2. JB4EP and JB4SP Enclosures

Junction Box Wiring

All TuffSeal junction box models have been designed to connect and trim up to four load cells per board. It is possible to use this box with other combinations. Use the expansion port on the main board, to connect multiple junction boxes in series to accommodate applications that have more than four load cells.

1. Determine the wiring pattern to be used.
2. Route the load cell cables through the cord grips, do not tighten the grips.
3. Strip the wire insulation back 1/4 inch to expose the wire.
4. Push in and hold the quick-connect lever with a small screwdriver.
5. Insert the appropriate wire into the exposed wire opening.
6. Release the screwdriver to allow the spring-loaded gate to close and lock the wire in place.

NOTE:
The spring-loaded terminals will accommodate 12-28 gauge wire.

Connect Indicator

The indicator terminal strip is used to connect the main cable to the indicator.

1. Determine the indicator’s load cell input connections from the indicator manual.
2. Run a cable from the indicator terminal into the junction box through the cord grip.
3. Strip the wire insulation back 1/4 inch to expose the wire.
4. Push in and hold the quick-connect lever with a small screwdriver.
5. Insert the appropriate wire into the exposed wire opening.
6. Release the screwdriver to allow the spring-loaded gate to close and lock the wire in place.

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.

Trimming Procedure

Trimming is a process of equalizing the output from multiple individual load cells. If needed, load cell output can be individually trimmed with potentiometers. If more than 5% of normal output needs to be trimmed to equalize output, check for other possible problems. When all errors except cell mismatch and cable extensions or reductions have been corrected, continue with the trimming.

Excitation Board Trimming

Excitation Board Trimming (JB4ES and JB4EP)
Use the following steps to properly trim the JB4ES and JB4EP junction boxes.

1. Determine the number of load cells needed.

2. Remove the jumpers to enable trimming of each load cell in use.

3. Set all potentiometers fully clockwise to give maximum signal output from each load cell.

4. Zero the indicator.

5. Place calibrated test weights over each load cell. The amount of test weights to be used depends on the scale configuration.
   NOTE: Refer to Handbook 44 Field Manual, published by NIST (National Institute of Standards and Technology, for weight recommendations. For a four- cell platform, its 25% scale capacity is recommended.

6. Record the value displayed on the indicator once the test weight is placed on each corner, directly over the load cell. Do not allow weight to overhang the sides.

7. Allow the scale to return to zero each time to check for friction or other mechanical problems.

8. Select the load cell with the lowest value as the reference load cell. This load cell will not be trimmed.

9. Place the same test load over one of the other load cells.

10. Use the corresponding potentiometer to trim the load cell equal to the reference load cell.

11. Repeat Steps 9 and 10 until all remaining load cells have been trimmed.

12. Once trimming is complete, check all load cells again for repeatability. If necessary, repeat Steps 4 through 11.

13. Pull the excess cable out of the enclosure.

14. Tighten the cord grip assemblies with a wrench. To be watertight, each cord grip must be tightened so the rubber sleeve begins to protrude from the hub.

15. Plug unused hubs to prevent moisture entry.

16. Place the supplied desiccant filter in the junction box.

17. Replace the cover and tighten the screws in an alternating pattern to be certain the gasket is compressed equally in all locations.

IMPORTANT:
See the Electronic Replacement Parts and Components catalog to order extra hole plugs if needed for Step 15. Inspect the desiccant during normal service and change the desiccant as needed.

Signal Board Trimming Procedure

Signal Board Trimming Procedure (JB4SS and JB4SP)
Use the following steps to properly trim the JB4SS and JB4SP junction boxes.

1. Determine the number of load cells needed.

2. Ensure jumpers are in place to enable trimming the load cells. Remove jumpers for unused cells.

3. Set all potentiometers fully clockwise to give maximum signal output from each cell.

4. Zero the indicator.

5. Place calibrated test weights over each load cell in turn. The amount of test weights to be used will depend on the scale configuration.
   NOTE: Refer to Handbook 44 Field Manual, published by NIST (National Institute of Standards and Technology, for weight recommendations. For a four- cell platform, its 25% scale capacity is recommended.

6. Record the value displayed on the indicator once the test weight is placed on each corner, directly over the load cell. Do not allow weight to overhang the sides.

7. Allow the scale to return to zero each time to check for friction or other mechanical problems.

8. Select the load cell which has the lowest value as the reference point. This cell will not be trimmed.

9. Place the same test load over one of the other load cells.

10. Use the corresponding potentiometer to trim the load cell equal to the reference load cell.

11. Repeat Steps 9 and 10 until all remaining load cells have been trimmed.

12. Once trimming is complete, check all load cells again for repeatability. If necessary, repeat Steps 4 through 11.

13. Pull the excess cable out of the enclosure.

14. Tighten the cord grip assemblies with a wrench. To be watertight, each cord grip must be tightened so the rubber sleeve begins to protrude from the hub.

15. Plug unused hubs to prevent moisture entry.

16. Place the supplied desiccant filter it in the junction box.

17. Replace the cover and tighten the screws in an alternating pattern to be certain the gasket is compressed equally in all locations.

IMPORTANT:
See the Electronic Replacement Parts and Components catalog to order extra hole plugs if needed for Step 15. Inspect the desiccant during normal service and change the desiccant as needed.

Board Installation

The 4-channel board is used in many Rice Lake Weighing systems products and is FM-approved. Use this document when replacing the board in an existing product.

WARNING:
Some procedures described in this manual require work inside the product. These procedures are to be performed by qualified service personnel only.

Installation
To replace the board in the existing product, follow these steps:

1. Open the product and locate the current 4-channel board.
2. Make a note of the wiring configuration of the current board.
3. Remove the wiring from the board.
4. Loosen the mounting screws and remove the board from the product.
5. Install the new board and secure it with mounting hardware.
6. Reinstall the wiring as noted in Step 2.
7. Close the product.

Refer to the product manual for additional information.

Special Conditions of Use

• Clean the product enclosure with a damp cloth only – Electrostatic Charging Hazard.
• This equipment was examined and approved for connection to a single Indicator only.

TuffSeal Light to Mid-Range Capacity Junction Box

© Rice Lake Weighing Systems Content is subject to change without notice. 230 W. Coleman St. • Rice Lake, WI 54868 • USA USA: 800-472-6703 • International: +1-715-234-9171. www.ricelake.com.

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