Rice Lake JB8SP Installation guide

Type
Installation guide

Rice Lake JB8SP is a heavy-capacity junction box designed for truck scale installations, accommodating up to eight load cells. It features a rugged construction with a Prevent® breather vent to prevent pressure buildup, ensuring accurate and reliable weighing. The JB8SP enables individual load cell output trimming for precise calibration and has an expansion terminal for connecting additional junction boxes, making it suitable for larger scale systems. Additionally, it provides transient protection to safeguard the connected load cells from electrical surges and disturbances.

Rice Lake JB8SP is a heavy-capacity junction box designed for truck scale installations, accommodating up to eight load cells. It features a rugged construction with a Prevent® breather vent to prevent pressure buildup, ensuring accurate and reliable weighing. The JB8SP enables individual load cell output trimming for precise calibration and has an expansion terminal for connecting additional junction boxes, making it suitable for larger scale systems. Additionally, it provides transient protection to safeguard the connected load cells from electrical surges and disturbances.

TuffSeal®
Heavy Capacity Junction Box
JB8SP/JB8SPT
Installation Manual
PN 89927 Rev DApril 27, 2021
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 i
Contents
Technical training seminars are available through Rice Lake Weighing Systems.
Course descriptions and dates can be viewed at www.ricelake.com/training
or obtained by calling 715-234-9171 and asking for the training department.
1.0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Model Designations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.0 Wiring the Junction Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4.0 Transient Board Installation Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1 Grounding Transient Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.0 Trimming Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
TuffSeal Heavy Capacity Junction Box JB8SP/JB8SPT
ii Visit our website www.RiceLake.com
Rice Lake continually offers web-based video training on a growing selection
of product-related topics at no cost. Visit www.ricelake.com/webinars
Introduction
© Rice Lake Weighing Systems All Rights Reserved 1
1.0 Introduction
The TuffSeal® eight-channel signal trim junction box is used in truck scale installations and can accommodate up to eight load
cells. Additional load cells can be connected to the junction box by wiring additional junction boxes to the expansion terminal
located on the main board. Both the JB8SP and JB8SPT models can withstand 900 PSI water pressure when correctly
installed. Both models have a new Prevent® breather vent. The breather vent inhibits the buildup of pressure caused by sudden
temperature or environmental changes. The breather vent should be changed every six months to one year as it will become
dirty over time.
Both models will function properly without modification; however, load cell output can be individually trimmed with
potentiometers. For more information, see Section 5.0 on page 8.
Transient protection comes standard with the JB8SPT model junction box.
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
Figure 1-1. TuffSeal Truck Scale Junction Box
1.1 Model Designations
The TuffSeal eight-channel junction box comes in two different models. They include:
Part No. Name Description
91782 JB8SP Truck Scale Signal Trim Version
91783 JB8SPT Truck Scale Signal Trim Version with Transient Protection
173807 JB8SP-FM-8 JB8SP signal trim eight-channel with expansion, FM approved
Table 1-1. Model Designations
TuffSeal Heavy Capacity Junction Box JB8SP/JB8SPT
2 Visit our website www.RiceLake.com
1.2 Safety
Safety 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 could 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.
DANGER
WARNING
CAUTION
IMPORTANT
WARNING
Installation
© Rice Lake Weighing Systems All Rights Reserved 3
2.0 Installation
The junction box should be mounted in a location 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 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 and JB8SPT 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 in - 0.353 in.
Note
TuffSeal Heavy Capacity Junction Box JB8SP/JB8SPT
4 Visit our website www.RiceLake.com
3.0 Wiring the Junction Box
All TuffSeal junction box models have been 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
(Figure 3-1), to connect multiple junction boxes in series to accommodate applications that have ten or more load cells.
Figure 3-1. Expansion Port Wiring Location
1. After determining the wiring pattern, route the load cell cables through the cord grip assemblies and leave the grips
loose until final closure.
2. Before connecting the load cell wires to the terminals, strip the wire insulation back 1/4" to expose the wire. The
pluggable connector will accommodate 12 to 28 gauge wire.
3. To connect the load cell wires to the appropriate connectors, open each pole with a small screwdriver and insert the
appropriate wire into the exposed wire opening.
JMP/NEGJMP/POS
EXPANSION/J9
ARC
L3
L4
L2
L1
INDICATOR/J10
Assembly
-EX
-EX
+EX
+SI
PN Rev
.
+SI
-SI
-SI
+SEN
SHD
+SEN
SHD
+EX
-SEN
-SEN
CUT TRACE TO ISOLATE SENSE LINE
R41
JP17
JP7
R52
R50
R40
R24
R14
R15
JP20
JP10
R26
R51
R49
R47
JP16
R45
R43
JP9
R23
R21
JP6
JP8
R17
R38
R36
R34
JP11
R32
R30
R28
R10
R8
JP1
R4
R2
R33
JP12
JP2
VR9
JP19
R48
VR7
JP18
R42
R44
R22
R25 R16
R18
VR2
R19
R39
VR10
R35
R37
VR11
R27
R29
R31
R9
R11
R12
R1
R3
R5
VR5
R6
JP5
VR8
VR3
VR1
VR12
VR6
J1
VR4
J2 R13
R7
J5
R46
JP4
JP3
ARGND
JP14
JP15
JP13
J8
J4
J3
J6
R20
J7
JP
TRIM
TRIM
TO
-EX
+EX
+SI
-EX
+EX
+SI
-EX
+EX
1
+SI
-EX
+EX
+SI
JP
JP
TO
SIGNAL
2005
SIGNAL
CUT TO
DISABLE
CUT
CELL# CELL# CELL#
SHD
1
SHD
-SI
1
-SI
SHD
-SI
1
-SI
SHD
SIGNAL
CUT TO CUT
SECT#
DISABLE
CELL# CELL#
SIGNAL SIGNAL SIGNAL
D
L
D
DISABLE
CELL#
SECT#
DISABLE
CELL#
RICE LAKE WEIGHING SYSTEMS
JP
-EX
+EX
+SI
-EX
+EX
+SI
-EX
+EX
+SI
-EX
+EX
+SI
SIGNAL
TRIM
TRIM
TRIM
TRIM
TRIM
TRIM
SHD
1
SHD
-SI
1
-SI
1
-SI
SHD
1
-SI
SHD
CONNECT BOTH SHUNTS
TO APPLY SIGNAL
SECT#
SIGNAL SIGNAL SIGNAL
CELL#
SECT#
DISCONNECT BOTH SHUNTS
TO REMOVE SIGNAL
JMP/NEGJMP/POS
EXPANSION/J9
ARC
L3
L4
L2
L1
INDICATOR/J10
Assembly
-EX
-EX
+EX
+SI
PN Rev.
+SI
-SI
-SI
+SEN
SHD
+SEN
SHD
+EX
-SEN
-SEN
CUT TRACE TO ISOLATE SENSE LINE
Wiring the Junction Box
© Rice Lake Weighing Systems All Rights Reserved 5
4. Tighten the end screw with the screwdriver to secure each wire into place.
5. Plug the terminal to the appropriate header socket.
6. The indicator terminal is used to connect the main cable to the weight indicator. Determine the indicator's load cell
input connections from the operation manual.
7. Run a cable from the indicator terminal into the junction box through the larger cord grip.
8. 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. See Figure 3-2.
Figure 3-2. Drip Loop Cable
Note
TuffSeal Heavy Capacity Junction Box JB8SP/JB8SPT
6 Visit our website www.RiceLake.com
4.0 Transient Board Installation Procedure
The JB8SPT comes standard with transient protection (PN 89894). Figure 4-1 shows where the transient protection board
plugs into the main CPU board.
Figure 4-1. TuffSeal Junction Box, Transient Board Location
+1
53*.
53*.
&9
&9
4*
&9
&9
4*
&9
&9
4*
&9
&9
4*
+1
+1
4*(/"-

4&$5
&"$)6/64&%4&$5*0/
4*(/"-
$&-- $&-- $&--
4)%
4)%
4*
4*
4)%
4*
4*
4)%
4*(/"-
4&$5 $&-- $&--
4*(/"- 4*(/"- 4*(/"-
$
,
$
3*$&-",&8&*()*/(4:45&.4
$&--
4&$5
$&--
+1
&9
&9
4*
&9
&9
4*
+1
&9
&9
4*
&9
&9
4*
4&$5
4*(/"-
53*.
53*.
53*.
53*.
53*.
53*.
"TTFNCMZ
&9
&9
&9
4*
4)%
4)%
4*
4*
4*
4)%
4*
4)%
$0//&$5#05)4)6/54
50"11-:$&--4*(/"-
4*(/"- 4*(/"- 4*(/"-
$&--
1/3FW
4*
4*
4*
3&.07&4)6/550%*4$0//&$5
4&$5
563/105$-0$,8*4& '03."9*.6.4*(/"-
4&/
4)%
4&/
4)%
%*4$0//&$5#05)4)6/54
503&.07&$&--4*(/"-
&9
4&/
4&/
$6553"$&50*40-"5&4&/4&-*/&
3
3
3
+1
+1
+1
3
3
3
3
3
3
+1
+1
+1
3
+1
+1
3
3
3
2
3
+1
3
3
+1
3
3
3
3
3
3
3
3
3
3
3
3
3
+1
+1
73
+1
3
73
+1
3
3
3
3 3
3
73
3
2
73
3
3
73
3
3
3
3
3
3
3
3
3
73
3
+1
+.1/&(+.1104
73
73
73
73
73
+
73
+ 3
&91"/4*0/+
+
"3$
+1
+1
"3(/%
+1
*0
+1
-
-
-
+
*
+
+
-
*
*/%*$"503+
+.1/&(+.1104
&9
$6553"$&50*40-" 5&4&/4&-*/&
DUPST
4&/
4FDUJPO
4FDUJPO
4FDUJPO
4FDUJPO
4FDUJPO1PUFOUJPNFUFS *OEJWJEVBM1PUFOUJPNFUFST
4FDUJPO*TPMBUJPO+VNQFST
.PWFKVNQFSUPEJTDPOOFDU
FBDIVOVTFETFDUJPO
(SPVOEJOH-VH
Transient Board Installation Procedure
© Rice Lake Weighing Systems All Rights Reserved 7
4.1 Grounding Transient Protection
To ensure proper operation, the JB8SP and JB8SPT must be grounded to protect the junction box from stray voltage and is
essential for operation of the DC transient protection incorporated into the junction box.
A ground wire has already been attached to the grounding lug located on the main board and extends out of the junction box
cord grip. Securely attach a 10 gauge ground wire to the ground wire that's already coming out of the junction box. The final
ground wire connection must be at the AC power supply ground terminal, separate from the truck scale ground.
Figure 4-2 illustrates an example of single point grounding of the junction box and the truck scale.
Figure 4-2. Single Point Grounding
AC Power
Supply
#10 Copper
Ground Wire
Serial
Communication
Homerun
Cable
Load Cell
Cable
AC Outlet
AC Outlet
Power Company Ground Rod
*Always verify that installed wiring is properly grounded
R41
JP17
JP7
R52
R50
R40
R24
R14
R15
JP20
JP10
R26
R51
R49
R47
JP16
R45
R43
JP9
R23
R21
JP6
JP8
R17
R38
R36
R34
JP11
R32
R30
R28
R10
R8
JP1
R4
R2
R33
JP12
JP2
VR9
JP19
R48
VR7
JP18
R42
R44
R22
R25 R16
R18
VR2
R19
R39
VR10
R35
R37
VR11
R27
R29
R31
R9
R11
R12
R1
R3
R5
VR5
R6
JP5
JMP/NEGJMP/POS
VR8
VR3
VR1
VR12
VR6
J1
VR4
J2 R13
R7
EXPANSION/J9
J5
ARC
R46
JP4
JP3
ARGND
JP14
JP15
JP13
L3
L4
L2
J8
J4
J3
J6
L1
R20
J7
INDICATOR/J10
JP
TRIM
TRIM
TO
-EX
+EX
+SI
-EX
+EX
+SI
-EX
+EX
1
+SI
-EX
+EX
+SI
JP
JP
TO
SIGNAL
2005
SIGNAL
CUT TO
DISABLE
CUT
CELL# CELL# CELL#
SHD
1
SHD
-SI
1
-SI
SHD
-SI
1
-SI
SHD
SIGNAL
CUT TO CUT
SECT#
DISABLE
CELL# CELL#
SIGNAL SIGNAL SIGNAL
D
L
D
DISABLE
CELL#
SECT#
DISABLE
CELL#
RICE LAKE WEIGHING SYSTEMS
JP
-EX
+EX
+SI
-EX
+EX
+SI
-EX
+EX
+SI
-EX
+EX
+SI
SIGNAL
TRIM
TRIM
TRIM
TRIM
TRIM
TRIM
Assembl y
-EX
-EX
+EX
+SI
SHD
1
SHD
-SI
1
-SI
1
-SI
SHD
1
-SI
SHD
CONNECT BOTH SHUNTS
TO APPLY SIGNAL
SECT#
SIGNAL SIGNAL SIGNAL
CELL#
PN Rev.
+SI
-SI
-SI
SECT#
+SEN
SHD
+SEN
SHD
DISCONNECT BOTH SHUNTS
TO REMOVE SIGNAL
+EX
-SEN
-SEN
CUT TRACE TO ISOLATE SENSE LINE
Transient Boa rd Connectors
Grounding Lu g
JB8SPT
Junction Box
Transient Protection
RLWS PN 91783
TP-232
DC Transient Protection
RWS PN 33185
TP-232
DC Transient Protection
RWS PN 33185
UJB3T6
DC Transient Protection
RWS PN 21134
UPS Device
AC Transient Protection
UPS Device
AC Transient Protection
Fuse
Panel
TuffSeal Heavy Capacity Junction Box JB8SP/JB8SPT
8 Visit our website www.RiceLake.com
5.0 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.
Whenever a substantial amount of trim (more than 7% of normal output), seems necessary to equalize output, check for other
possible problems. The best trim is always the least amount of trim.
The JB8SP and JB8SPT is a signal trimming device with individual and section trimming potentiometers (Figure 4-1 on page 6).
Use the following steps to properly trim the JB8SP and JB8SPT 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 5). This ensures sensing out to the furthest
junction box within the system. A sic 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.
Make sure to remove all shunt jumpers of the individual cells that are not being used to disable them and ensure the
section potentiometer is turned fully.
If desired, all the potentiometers can be adjusted 3-5 turns counter-clockwise to allow trim capabilities both positive
and negative.
3. Trim by turning potentiometers counter-clockwise to lower output to match 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 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. As load cell corrections are interactive, check zero after every adjustment to
avoid zero shift.
7. Check cells or sections again and repeat steps six, seven and eight as needed.
Note
Note
Trimming Procedure
© Rice Lake Weighing Systems All Rights Reserved 9
Figure 5-1. 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 1/2 turn (180º). To be watertight, each cord grip must be tightened so the rubber sleeve
begins to protrude from the hub.
11. Unused hubs must be properly plugged to prevent moisture entry. Extra hole plugs are provided to seal up any unused
hubs.
12. 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 desiccant as needed.
13. 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.
+1
53*.
53*.
&9
&9
4*
&9
&9
4*
&9
&9
4*
&9
&9
4*
+1
+1
4*(/"-

4&$5
&"$)6/64&%4&$5*0/
4*(/"-
$&-- $&-- $&--
4)%
4)%
4*
4*
4)%
4*
4*
4)%
4*(/"-
4&$5 $&-- $&--
4*(/"- 4*(/"- 4*(/"-
$
,
$
3*$&-",&8&*()*/(4:45&.4
$&--
4&$5
$&--
+1
&9
&9
4*
&9
&9
4*
+1
&9
&9
4*
&9
&9
4*
4&$5
4*(/"-
53*.
53*.
53*.
53*.
53*.
53*.
"TTFNCMZ
&9
&9
&9
4*
4)%
4)%
4*
4*
4*
4)%
4*
4)%
$0//&$5#05)4)6/54
50"11-:$&--4*(/"-
4*(/"- 4*(/"- 4*(/"-
$&--
1/3FW
4*
4*
4*
3&.07&4)6/550%*4$0//&$5
4&$5
563/105$-0$,8*4& '03."9*.6.4*(/"-
4&/
4)%
4&/
4)%
%*4$0//&$5#05)4)6/54
503&.07&$&--4*(/"-
&9
4&/
4&/
$6553"$&50*40-"5&4&/4&-*/&
3
3
3
+1
+1
+1
3
3
3
3
3
3
+1
+1
+1
3
+1
+1
3
3
3
2
3
+1
3
3
+1
3
3
3
3
3
3
3
3
3
3
3
3
3
+1
+1
73
+1
3
73
+1
3
3
3
3 3
3
73
3
2
73
3
3
73
3
3
3
3
3
3
3
3
3
73
3
+1
+.1/&(+.1104
73
73
73
73
73
+
73
+ 3
&91"/4*0/+
+
"3$
+1
+1
"3(/%
+1
*0
+1
-
-
-
+
*
+
+
-
*
*/%*$"503+
+1
53*.
&9
&9
+1
+1
4*(/"-
4)%
4*(/"-
4*(/"-
$&--
+1
&9
&9
53*.
4)%
$0//&$5#05)4)6/54
50"11-:$&--4*(/"-
4*(/"-
$&--
%*4$0//&$5#05)4)6/54
503&.07&$&--4*(/"-
3
3
+1
3
3
3
3
2
3
73
73
*0
+ +
TuffSeal Heavy Capacity Junction Box JB8SP/JB8SPT
10 Visit our website www.RiceLake.com
.
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
April 27, 2021 PN 89927 Rev D
  • Page 1 1
  • Page 2 2
  • Page 3 3
  • Page 4 4
  • Page 5 5
  • Page 6 6
  • Page 7 7
  • Page 8 8
  • Page 9 9
  • Page 10 10
  • Page 11 11
  • Page 12 12
  • Page 13 13
  • Page 14 14
  • Page 15 15
  • Page 16 16

Rice Lake JB8SP Installation guide

Type
Installation guide

Rice Lake JB8SP is a heavy-capacity junction box designed for truck scale installations, accommodating up to eight load cells. It features a rugged construction with a Prevent® breather vent to prevent pressure buildup, ensuring accurate and reliable weighing. The JB8SP enables individual load cell output trimming for precise calibration and has an expansion terminal for connecting additional junction boxes, making it suitable for larger scale systems. Additionally, it provides transient protection to safeguard the connected load cells from electrical surges and disturbances.

Ask a question and I''ll find the answer in the document

Finding information in a document is now easier with AI