Kistler-Morse LD360s User Manual
TM TM
Load Disc LD3 /LD360s
Installation Manual
CAUTION
It is essential that all instructions in
this manual be followed precisely to
ensure proper operation of the equipment.
LD3 and LD360s are trademarks
of Venture Measurement Company , LLC
97-1137-01
Rev E
Feb 2006
NOTICE
The content of this document is the intellectual property of Kistler-Morse. Any reproduction or translation
of this document without the written authorization of a Kistler-Morse officer is prohibited.
CAUTION
Follow these rules if welding is done on the vessel after installation of the Load Disc. The electrical current
of the welder may pass through the Load Disc, causing damage to the transducer and possibly to the signal
processor. To avoid damage, follow these precautions:
1. Disconnect the Load Disc cables from the signal processor.
2. Ground the welder as close to the welding joint as possible. The welding ground must be between the
Load Disc and the weld joint to prevent the welding current from going through the Load Disc to earth
ground.
Note
High temperatures can damage the Load Disc. If you are welding in the vicinity of a Load Disc,
monitor the temperature of the metal adjacent to the Load Disc. If it becomes too hot to touch, stop
welding immediately and remove the Load Disc before continuing. Prior to reinstalling the Load
Disc, verify that no damage has occurred by referring to the measurement procedures in Troubleshooting, Appendix C.
Table of Contents
Table of Contents
Introduction ...................................................................................................i
Welcome ...........................................................................................................................................................i
About this manual ............................................................................................................................................ i
Manual Conventions.................................................................................................................................. i
Specifications...................................................................................................................................................ii
Chapter 1. Description of the Load Disc ................................................ 1-1
Introduction ..................................................................................................................................................1-1
General Description of Measurement System ........................................................................................1-1
Applications Description ................................................................................................. .......................1-1
Installation Option Description.....................................................................................................................1-2
Universal T op Adaptor Plate .................................................................................................................1-2
Leveling Top Plate Adapter (1,000 - 7,500 lbs ONLY).........................................................................1-3
Anyadapter Plate (1,000 - 7,500 lbs ONLY) ...................................................................................... ...1-3
Leveling Base Adapter Plate .................................................................................................................1-4
Chapter 2. Preparing for the Load Disc Installation ............................ 2-1
Check Shipment ............................................................................................................................................2-1
Check Load Disc Order Items ................................................................................................................2-1
Visual Check ...........................................................................................................................................2-1
Prepare Installation Equipment.....................................................................................................................2-2
Installation Equipment Needed .............................................................................................................2-2
Vessel Preparation ........................................................................................................................................2-2
Factors That Affect Performance..................................................................................................................2-3
Chapter 3. Mounting the Load Disc ....................................................... 3-1
General Information......................................................................................................................................3-1
Check Load Disc General Installation ..........................................................................................................3-2
Leveling and Shimming ................................................................................................................................3-5
Leveling/Shimming using Universal Top Adapter Plate (1,000 - 7,500 lbs ONLY) ...............................3-5
Leveling/Shimming using Leveling Top Adapter Plate (1,000 - 7,500 lbs ONLY) .................................3-6
Leveling/Shimming using Leveling Base Adapter Plate.........................................................................3-6
Leveling/Shimming using Anyadapter Plate...........................................................................................3-6
Stainless Steel Junction Box Mounting and Wiring......................................................................................3-7
Appendix A: Contact Information.............................................................................. A-1
Appendix B: System Calibration................................................................................. B-1
Appendix C: Troubleshooting ..................................................................................... C-1
Appendix D: Technical Drawings................................................................................ D-1
Table of Contents
Introduction
Introduction
This chapter describes the organization, manual conventions,
and provides specification information.
Welcome
About this manual
This manual describes the installation of the Load Disc load cell and its
various hardware options. It includes procedures for leveling and shimming
of the vessel if it is neccessary . Instructions for wiring the load cell to the
junction boxes and wiring the junction boxes together and to the signal
processor are also included. Refer to the signal processor manual for specific
information on wiring the junction boxes to the signal processor.
Contact KM at 1-800-426-9010 if you have any questions regarding the
installation. For outside the USA and Canada, call 864-574-2763.
The chapters are organized in the following way:
Chapter 1: Description of the Load Disc
Chapter 2: Preparing the Load Disc for Installation
Chapter 3: Mounting the Load Disc
Appendix A through D include contact info, system calibration, troubleshooting charts and technical drawings (TI’s).
Manual Conventions
Three kinds of special explanations appear throughout the manual —
Warning , Caution and Note. The format and significance of each is
defined below:
WARNING
Possible danger to people. Injury may result if this information is
ignored.
CAUTION
Possible risk to the product. The Load Disc or other equipment may
be damaged if this information is ignored.
Note
Contains additional information about a step or feature critical to the
installation or operation of the Load Disc.
i
Introduction
Specifications
LD3 LD360s
Mechanical
Compression 4 x Rated Load
Tension 1 x Rated Load
Shear 0.5 x Rated Load
Functional Integrity 2 x Rated Load (compression)
Electrical
Excitation Voltage 10-14 VDC 10-14 VDC
Impedance 7.5K Ohms±1% 7.5K Ohms±1%
Maximum Current 3mA @ 12 VDC excitation 3mA @ 12 VDC excitation
Output (@ 12 VDC excitation
Non-Linearity/Hysteresis combined: 0.08% of standardized output 0.08% of standardized output
Return to Zero 0.05% of Rated Output 0.05% of Rated Output
Zero Balance 1% Rated Capacity 1% Rated Capacity
Rated Output (12 VDC excitation) 360 mV±1% (30mV/V nominal) 360 mV±1% (30mV/V nominal)
Environmental
T emperature Range
Standard Temperature Range 0° to 100°F (-18° to 38°C) 0° to 100°F (-18° to 38°C)
Mid Temperature Range 50° to 150°F (10° to 66°C) 50° to 150°F (10° to 66°C)
Temperature Sensitivity Change ±0.015% rated load per degree ±0.015% rated load per degree
Fahrenheit over the Fahrenheit over the compensated
compensated range, 0° to 100°F range, 0° to 100°
Temperature Zero Shift 0.006%/°F (0.011%/°C) 0.006%/°F (0.011%/°C)
Humidity 100% 100%
Storage Temp Range-Std and Mid -40° to 176° F (-40° to 80°C) -40° to 176°F (-40° to 80°C)
Rating NEMA -6P (include NEMA -4X NEMA -6P (include NEMA -4X
and NEMA -6); hermetically and NEMA -6); hermetically sealed
sealed for high pressure caustic for high pressure caustic washdown
washdown and prolonged and prolonged submergence in water
submergence in water. (Cable (Cable must be installed and
must be installed and tightened tightened to meet rating.)
Physical
Construction 17-4 PH 900 stainless steel 17-4 PH 900 stainless steel
Connection Nickel plated brass body with a 6P rated sealed 5-conductor 12mm
Shipping Weight 5.0 lbs (2.3 kg) 5.0 lbs (2.3 kg)
to meet rating.)
polymide insert and neoprene male receptacle Turck Eurofast
Grommet. 22 AWG 3 conductor compatible
unshielded with PVC sheath
(15’ standard)
4 x Rated Load
1 x Rated Load
0.5 x Rated Load
2 x Rated Load (compression)
ii
Chapter 1: Description of the Load Disc
Chapter 1:
Description of the Load Disc
This chapter describes the Load Disc Compression Load Cell
and its installation options.
Introduction
Figure 1-1:
Load Disc Compression Load
Cell with optional NEMA-6P
cable system
weight/4
weight/4
Figure 1-2:
General installation layout for Load Disc
using a junction box.
Load Disc
(x4)
junction box
signal
processor
weight/4
weight/4
Signal
transmission/
Serial Output
Setpoints for
signaling a change
in staus, such as
high and low
alarms
The Load Disc is a low profile load cell that is bolted to both the support
surface and the vessel supports, and is used to measure the weight of materials
in vessels and tanks. The sealed, stainless steel construction–NEMA-6P rated
unit with watertight cable system and cable entry–makes the Load Disc ideal
for use in high-pressure wash down and occasionally submerged environments.
The low-profile design for low clearance installations also keeps the vessel’s
center of gravity low and stable. Vessel tipping, walking or overturning while
agitating is eliminated. Installation and setup is simplified with less hardware.
No external vessel hold-downs are necessary, even in areas of high wind or
seismic activity. There are no moving parts that can wear out or require
replacement. The high output of the semiconductor sensor allows immunity to
industrial electrical noise and longer “load cell to signal processor” runs.
General Description of Measurement System
The deflection of the Load Disc load cell by the vessel weight is measured by
the semiconductor sensor, which is entirely sealed within the watertight cavity
of the transducer. The sensor converts the deflection into an electrical signal
which is directly proportional to the increase or decrease of the vessel
contents. Material movement and changes in material repose will not affect
the accuracy of the system. Accurate weight information is then sent to a
signal processor for display, information transmission and storage (See Figure
1-2).
Applications Description
The watertight design of the Load Disc load cell makes it ideal for measuring
bulk material in the sanitary and clean-in-place environments. It is particularly suitable for use on mixing and blending vessels, surge hoppers, and
agitated vessels. Rugged, solid, bolt-in-place mounting assures vessel
stability in outdoor storage vessels with gussets or legs used in all process
industries.
1-1
Chapter 1: Description of the Load Disc
Installation Option Descriptions
This section will briefly describe the following hardware options
for the Load Disc:
Universal Top Plate Adapter, Leveling Top Plate Adapter,
Anyadapter Plate and Leveling Base Adapter Plate.
See Chapter 2 and 3 for more specific installation instructions and
refer to the TI drawings located in Appendix D.
Universal T op Adapter Plate
This option consists of the Universal T op Adapter Plate, spring washer
and a hex head bolt. The adapter plate attaches to the load disc with the bolt
and washer. The adapter plate then bolts to a vessel gusset or a flat plate
welded to the vessel leg, using customer-supplied hardware.
Note: Accomodates up to thr ee
degrees of tilt in the floor or
vessel legs.
1-2
Chapter 1: Description of the Load Disc
Leveling T op Plate Adapter
This option consists of the Universal T op Adapter Plate, a hex head bolt,
spherical washer set and jam nuts. The adapter plate attaches to the load disc
with the hex bolt and hardware. The adapter plate then bolts to a vessel gusset or
a flat plate welded to the vessel leg, using customer-supplied hardware.
This hardware arrangement allows 360
degree movement of the top plate and
angular misalignment of up to 3 degrees.
Additionally , there is a leveling feature that
allows vertical height adjustments. This
arrangement also incorporates a locking-jam
nut to insure the height remains unchanged.
(1,000 - 7,500 lb capacity ONLY)
Anyadapter Plate
This option consists of the unique Anydapter Plate which
has a universal bolt pattern (to fit a variety of vessel leg
flanges), and a hex head bolt. The plate attaches to the
load disc with the bolt and washers. The Anyadapter plate
then bolts to a vessel gusset or a flat plate welded to the
vessel leg, using customer-supplied hardware.
This hardware arrangement allows 360 degree movement of the top plate and angular misalignment of up to
3 degrees. Additionally, there is a leveling feature that
allows vertical height adjustments. This arrangement
also incorporates a locking-jam nut to insure that the
height remains unchanged.
(1,000 - 7,500 lb capacity ONLY)
1-3
Chapter 1: Description of the Load Disc
Leveling Base Adapter Plate
This kit consists of a Leveling Base Adapter Plate and four hex bolts, flat
washers, and lock washers. The Load Disc bolts onto the leveling base adapter
plate. This plate rests on four leveling nuts and washers screwed onto anchor
bolts installed in the foundation. By turning the leveling nuts, the height of the
load discs and thus the vessel, can be adjusted for proper load distribution.
Note:
Adapter plate not shown in
illustration at right.
This kit requires an adapter
plate for proper installation.
1-4
Chapter 2: Preparing for the Load Disc Installation
Chapter 2:
Preparing for the Load Disc Installation
This chapter describes the pre-check procedures for the Load Disc.
Checking the Load Discs before installation will ensure properly
working equipment that will provide accurate monitoring of vessel
contents.
Check Shipment
Perform the following prior to installing the Load Disc:
Check Load Disc Order Items
The following items are included with a typical order for each vessel
(quantities dependent on application):
Load Disc Load Cell
Junction Boxes or Molded Junction Boxes
Top or Bottom Hardware
If any items are needed, contact KM before proceeding. Substituting
parts without KM approval may cause system problems and will void
the warranty.
Note:
A KM signal processor or a
KM Test Meter are required
to set up and install the
system.
V isual Check
Visually inspect all equipment in the order — including Load Discs,
junction boxes, and signal processors — to verify they have not been
damaged during shipment. If any item has been damaged, contact KM
for a replacement.
2-1
Chapter 2: Preparing for the Load Disc Installation
Prepare Installation
Equipment
(Customer Supplied)
The following equipment is needed to install Load Discs:
Lifting equipment
Tape measure
Level
Pry bar
Marking pen
Wrenches
ASTM A-325 bolts (or equivalent strength), lock
washers, and flat washers to secure Load Disc to
vessel support (if applicable)*
ASTM A-325 (or equivalent strength) anchor
bolts, lock washers, flat washers, and nuts to
secure Load Disc to vessel foundation (if
applicable)*
Vessel Preparation
KM Test Meter or signal processor
Shims (if applicable)
Grout (if applicable)
Digital Multimeter (FLUKE™ or equivalent)
optional
* See TI drawings in Appendix D for the appropriate bolt size.
There are two aspects to successful use of Load Discs — properly
functioning Load Discs and appropriate vessel support
characteristics. Review the following list of error sources, and make
the recommended corrections before you install the Load Discs:
• An inadequate vessel foundation can allow excessive
movement. Ensure the foundation is concrete or steel.
• Hidden load-bearing structures, such as discharge chutes
or plumbing supported by the floor, can reduce loads on
the vessel supports. Install flexible couplings to minmize
this problem.
• Cross-connecting structures, such as catwalks and
manifolds, can transfer loads from adjacent vessels.
Install slip joint or flex couplings to minimize this
problem.
• Shock loads can damage the Load Disc. Install protective
barriers or stops to prevent vehicles from hitting the
vessel supports.
2-2
Chapter 2: Preparing for the Load Disc Installation
Factors That Affect Performance
An independent, isolated vessel with no connection to any other vessel or adjacent structure provides the most accurate
results for a weight measurement system. Examples of this type of application are floor scales and truck scales. Connections to other vessels or structures affect accuracy because the transducers interpret strain changes caused by the connecting structures as being caused by changes in the material weight.
Some typical causes of error related to connecting structures and, where applicable, methods for reducing the errors
follow:
• Catwalk
• Hidden load bearing members
• Vessel goes through roof
• Tripper conveyors or deck plating
• Rigid piping connection between vessel and
another adjacent structure
• Poor Foundation
• Flexible Structure
• Uneven Loading
No horizontal run
No horizontal run
Flex coupling
Horizontal run too short for crosssectional area of pipe
Horizontal run length is ok for
cross-sectional area of pipe
Flex
2-3
Figure 2-1:
Examples of typical causes of error.
Chapter 3: Mounting the Load Disc
Chapter 3: Mounting the Load Disc
This chapter describes installation and wiring of the
Load Disc and junction boxes. Follow all instructions
carefully to ensur e proper operation of the system.
General Information
The Load Disc has a variety of mounting hardware options that
accommodate almost all possible applications. These general requirements apply to all applications:
• Ensure the surfaces where the baseplates bolt down onto are clean,
smooth, flat, and level, with less than 1° of slope in any direction.
• Ensure vessel legs/gussets are clean, smooth, flat, and level, with
less than 1° of slope in any direction.
CAUTION: If you need to
raise the vessel or one
vessel leg after installation,
loosen the bolts on all Load
Discs to prevent overloading.
• Position Load Disc so the cable cannot be snagged or chafed and
can be easily routed to the junction box.
• When raising the vessel for Load Disc installation, use proper support to prevent the vessel from tipping or falling.
• During installation, carefully distribute the load to ALL Load
Discs evenly. PLACING THE LOAD ON ANY ONE LOAD DISC
MA Y CAUSE DAMAGE.
• Hardware and Bolts —
1. All bolts and hardware to attach the Load Disc to the vessel
and to the foundation are customer-supplied, ASTM A-325
or equivalent. (See TI drawings Appendix D)
2. Use specified hardware and bolt sizes. Using other than the
specified hardware can either reduce strength or overstress
the Load Disc during installation, voiding the warranty.
3. All bolts are kept loose until shimming and leveling is
complete.
• Securing Load Disc after Leveling/Shimming —
Once the weight distribution criteria has been satisfied
(page 3-4) through leveling and/or shimming, complete the installation by tightening the required bolts for your application.
3-1
Chapter 3: Mounting the Load Disc
Load Disc
General Installation
Note: Concrete foundation and grouting shown
for reference only. The
concepts apply to all
foundation types.
Anchor bolts supplied
by customer .
This section describes the Load Disc installation procedures for the
following hardware options:
Universal Top Plate Adapter , Leveling Top Plate Adapter , Anyadapter
Plate, and Leveling Base Adapter Plate.
1. Prior to installing the Load Discs, verify that they are the
correct capacity for your application by reviewing the
information engraved on the Load Disc baseplates.
2. If you have not already done so, connect the Load Disc cable to
the KM Test Meter (See pg. C-1). Measure the Load Disc
voltage output. W ith no-load, the preliminary measurement
should be +5mV and -5mV. (This measurement range is used
only to verify the condition of the Load Disc.) If the reading
is significantly outside of this range, consult the factory
before continuing the installation.
3. Raise the vessel.
4. Remove the cable from the KM Test Meter to the Load Disc.
5. Place bolt through center hole of adapter plate and install
hardware for your application
(See Appendix D:TI Drawings)
a. For Universal Top Plate Adapter, install bolt and
plate to the Load Disc, tightening bolt to 5-10 ft-lbs.
b. For Leveling and Anyadapter, install washers and
nuts to the bolt and plate, making sure the washers/
nuts are loosely tightened against plate. Install the
plate assembly to the Load Disc, tightening bolt to
5-10 ft-lbs.
6. For Leveling and Anyadapter applications, adjust plate to
lowest position by lowering jam nut to top of Load Disc and
tighten. Then lower leveling nut to the jam nut.
Figure 3-1: Angular misalignment
3-2
Chapter 3: Mounting the Load Disc
7. Inspect the foundation and vessel mounting surfaces that
will mate to the Load Disc plates.
a. Check the mounting hole locations and size on both
the foundation base and the vessel foot pad. (Refer
to the TIdrawings, Appendix D.)
b. Check the surfaces for flatness and angular
misalignment. A baseplate with leveling nuts is
recommended. (See Figure 3-1 below)
8. Mount the Load Disc assembly to the foundation. (See TI
drawings, Appendix D)
a. Gently lower the Load Disc to the foundation. Take care
to align the mounting holes with the foundation
mounting holes/studs.
b. Install the bolts and nuts as required. DO NOT fully
tighten the bolts at this time. Leave a 1/4-inch gap
between the nut and the washer to allow positioning
of the Load Discs. (See Figure 3-2.)
c. Repeat Steps 8a and 8b for the remaining Load Discs.
Figure 3-2: Leave 1/4-inch gap for positioning
Load Disc # No-Load Output Dead Weight Output Output Change (mV)
(mV) (mV) (Dead Weight Output - No-Load Output)
9. Re-install the Load Disc cable and record the voltage output at
“no- load” condition now that it is in position.
a. If not already done, connect the Load Disc cable to
the KM Test Meter as seen in Figure C-1
Troubleshooting.
b. Turn on the power to the KM Test Meter and set the
Simulate/T est switch to the T est position.
c. Record the no-load output into Figure 3-3 below or
create your own similar table. See the example chart in
Figure 3-5.
d. Assign a number (1, 2, 3, etc.) to the Load Disc and note
it.
e. Repeat steps c and d for all the Load Discs.
1
2
3
4
Figure 3-3: W eight Distribution Chart: Record YOUR system’s Load Outputs
3-3
Figure 3-4: Lower vessel onto
top plate.
Chapter 3: Mounting the Load Disc
10. Mount the vessel to the Load Disc.
a. Lower the vessel gently onto the Load Discs.
(Alignment pins may be used to help guide and
position the vessel.) (See Figure 3-4)
b. Center the Load Disc top mounting holes with the
vessel mounting holes, using the clearance
available from the bottom mounting holes.
Note: If the vessel hole pattern does NOT match up with
the Load Disc hole pattern, modify the mounting holes on
the vessel. DO NOT hammer or for ce the Load Disc into
position by tightening the mounting bolts. The vessel holes
will need to be resized or relocated.
Note: All output changes should
be positive! If you observe a
negative output change, check
wiring polarity and vessel load
shifting.
Note: The example below is an
ideal situation (load is centered). Offcenter loads caused
by offset mixers or gear boxes
will place weight on some
supports more than others. Do
not attempt to shim ALL
supports to ten percent of the
average output. Balance the
support weight between each
other making sure all legs carry
a load.
Calculation Example:
A verage Output Change =
(86mV + 83mV + 69mV +
89mV) / 4 = 81.8mV
c. Place the four top bolts (customer supplied)
through the vessel and the Load Disc mounting
holes. The bolts must be able to pass freely
through the holes without interference.
d. Tighten the bolts, leaving a 1/4-inch gap for
positioning. (See Figure 3-2)
11. Check dead weight output.
a. Connect the Load Disc cable to the KM Test
Meter, if not already done.
b. Record the dead weight output on your Weight
Distribution Chart that was started on page 3-3.
See the example below in Figure 3-5.
c. Calculate the Output Change. (Change should be
positive.)
d. The output increase from no-load to dead weight
can be within ten percent of the AVERAGE
output increase. In the example below, the average
output change for Load Discs #1, #2 and #4 meet
this condition, while the output from Load Disc
#3 is too low indicating it is carrying less weight.
Allowable range for Output
Change = Average Output
Change ± 10% =
81.8mV ± (.1 x 81.8mV) =
e. Load disc #3 will require a shimming and/or
leveling procedure which will distribute the weight
more evenly over all of the supports. (See
page 3-5, Leveling/Shimming)
73.6 to 90.0 mV
Load Disc # No-Load Output Dead Weight Output Output Change (mV)
(mV) (mV) (Dead Weight Output - No Load Output)
1 +3 +89 +86
2 +4 +87 +83
3 +2 +71 +69
4 -3 +86 +89
Figure 3-5: Example of Dead Weight Outputs and Output Change
3-4
Chapter 3: Mounting the Load Disc
Leveling and Shimming
Note: For installations where
leveling nuts are not used, load
balancing on the Load Discs
must be achieved by adding or
removing shims. Adjusting the
Load Discs to distribute the
vessel weight evenly may
require adding shims (supplied
by customer) systematically to
all disc locations.
Note: The Universal T op
Plate will accomodate angular
misalignment up to three
degrees maximum (Figure 3-6 ).
Ideally, the load is distributed
evenly across the top plate.
Note: Shimming the plates of
one Load Disc will probably
affect the weight distribution
on the Load Disc located on the
opposite side. Keep this in mind
while shimming.
The main objective of leveling/shimming the vessel is to distribute
the weight evenly on all of the Load Discs. Uneven weight distribution will reduce the accuracy of the weight measurement system as
a whole and in extreme cases may cause Load Disc damage.
Once the general instructions have been completed (page 3-2
through 3-4), begin the leveling and shimming instructions in this
section.
Leveling/Shimming using Universal Top Adapter Plate
(1,000 to 7,000 lb capacity ONLY)
1. Based on the Weight Distribution Chart (Figure 3-3)
and visual inspection, raise the vessel and cut/place
shims as required to adjust the distribution of weight on
the Load Discs. Begin with the “lowest output”
support first!
2. Gently lower the vessel and measure the dead weight
output and the output change of all of the Load Discs
to see how they are affected. Record again into the
Weight Distribution Chart on page 3-3.
3. Repeat Steps 1 and 2 until you have achieved the
desired output change of all of the Load Discs.
Note: Shims are typically
applied between the Load Disc
Top Plate and mating vessel
plate, but the gap condition
may exist at either the top or
bottom plates.
CAUTION: If you need to
raise the vessel or one
vessel leg after installation,
loosen the bolts on all Load
Discs to prevent overloading.
Figure 3-6: Angular misalignment
up to 3 degrees.
3-5
Chapter 3: Mounting the Load Disc
Leveling/Shimming using Leveling Top
Adapter Plate, Leveling Base Adapter Plate,
and the Anyadapter Plate
1. Based on the Weight Distribution Chart and visual
inspection, raise the leveling nut to adjust the top plate
until the weight distribution falls within the weight
distribution guidelines (See page 3-4). Check for gaps and
use shims as required.
2. Gently lower the vessel and measure the dead weight
output and the output change of all of the Load Discs
to see how they are affected. (See Weight Distribution
Chart page 3-3.)
3. Repeat Steps 1and 2 until you have achieved the
desired output change of all of the Load Discs.
Note: Shimming the plates of
one Load Disc will probably
affect the weight distribution
on the Load Disc located on
the opposite side. Keep this in
mind while shimming.
CAUTION: If you need to
raise the vessel or one
vessel leg after installation,
loosen the bolts on all Load
Discs to prevent overloading.
3-6
Chapter 3: Mounting the Load Disc
Stainless Steel Junction Box Mounting and Wiring
Mounting Junction Box
1. See Figure 3-7. Hold the junction box at the desired
mounting location. Mark the four mounting holes.
2. Mount the junction box with #8-32 socket head cap
screws and flat washers per your application. Tighten the
screws until snug.
Figure 3-7: Plastic and
Stainless Steel Junction Box
Mounting
Wiring Load Discs to Junction Box
See Figure 3-8. The stainless steel junction box accommodates up to
eight Load Discs, with up to two Load Disc wires at each terminal.
Note that the junction box has no pre-cut holes for conduit or fittings.
Follow this procedure:
1. Prepare junction box —
a. Remove the junction box cover.
b. Remove the terminal board from the junction box.
c. Carefully lay out the conduiting configuration —
the Load Disc cables connect to the terminals on
the left and the signal processor cable connects
on the right. Several Load Disc cables may enter
the box through the same conduit.
d. Cut the required fitting holes in the bottom and/or
sides of the junction box.
e. Install liquid tight fittings.
f. Seal fittings with Sikaflex™ or electrical grade
sealant.
Figure 3-8: Wiring Load Discs to Stainless
Steel Junction Box
3-7
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