RICE LAKE JB4ES TuffSeal Light to Mid Range Capacity Junction Box Instruction Manual

RICE LAKE JB4ES TuffSeal Light to Mid Range Capacity Junction Box

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 has the capability to 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 PSIwater 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 on page 6 of this manual. 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

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 8, 2022| Added information on new mid-range junction box
 |  |

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 midrange capacity junction box.

Special Conditions of Use

• Electrostatic Charging Hazard – Clean 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).

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.

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.

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

Connect Indicator

• The indicator terminal strip is used to connect the main cable to the indicator.
•  Determine the indicator’s load cell input connections from the indicator manual.
•  Run a cable from the indicator terminal into the junction box through the cord grip. Strip the wire insulation back 1/4 inch to expose the wire.
•  Push in and hold the quick-connect lever with a small screwdriver.
•  Insert the appropriate wire into the exposed wire opening.
•  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 (JB4ES and JB4EP)

• Use the following steps to properly trim the JB4ES and JB4EP junction boxes.
•  Determine the number of load cells needed.
•  Remove the jumpers to enable trimming of each load cell in use.
•  Set all potentiometers fully clockwise to give maximum signal output from each load cell.
•  Zero the indicator.
•  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, it’s 25% of scale capacity is recommended.
•  Record the value displayed on the indicator once test weight is placed on each corner, directly over the load cell. Do not allow weight to overhang the sides.
•  Allow the scale to return to zero each time to check for friction or other mechanical problems.
•  Select the load cell with the lowest value as the reference load cell. This load cell will not be trimmed.
•  Place the same test load over one of the other load cells.
• Use the corresponding potentiometer to trim the load cell equal to the reference load cell.
•  Repeat Steps 9 and 10 until all remaining load cells have been trimmed.
•  Once trimming is complete, check all loads cells again for repeatability. If necessary, repeat Steps 4 through 11.
•  Pull excess cable out of the enclosure.
•  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.
•  Plug unused hubs to prevent moisture entry.
•  Place the supplied desiccant filter it in the junction box.
•  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 (JB4SS and JB4SP)

• Use the following steps to properly trim the JB4SS and JB4SP junction boxes.
• Determine the number of load cells needed.
•  Ensure jumpers are in place to enable trimming the load cells. Remove jumpers for unused cells.
• Set all potentiometers fully clockwise to give maximum signal output from each cell.
• Zero the indicator.
• 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, it’s 25% of scale capacity is recommended.
• Record the value displayed on the indicator once test weight is placed on each corner, directly over the load cell. Do not allow weight to overhang the sides.
• Allow the scale to return to zero each time to check for friction or other mechanical problems.
• Select the load cell which has the lowest value as the reference point. This cell will not be trimmed.
• Place the same test load over one of the other load cells.
• Use the corresponding potentiometer to trim the load cell equal to the reference load cell.
• Repeat Steps 9 and 10 until all remaining load cells have been trimmed.
• Once trimming is complete, check all loads cells again for repeatability. If necessary, repeat Steps 4 through 11.
• Pull excess cable out of the enclosure.
• 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.
• Plug unused hubs to prevent moisture entry.
• Place the supplied desiccant filter it in the junction box.
• 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.

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.

References

• Rice Lake Weighing Systems
• Rice Lake Weighing Systems
• Videos and Webinars | Rice Lake Weighing Systems
• Rice Lake Weighing Systems

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