HI LPB SERIES
LOAD POINT ASSEMBLIES
OPERATION AND INSTALLATION
MANUAL
Corporate Headquarters
9440 Carroll Park Dr., Ste 150
San Diego, CA 92121
Phone: (858) 278-2900
FAX: (858) 278-6700
Web-Site: http://www.hardysolutions.com
Hardy Process Solutions Document Number: 0596-0238-01 Rev F
Copyright 2011 Hardy Process Solutions, Inc. All Rights Reserved. Printed in the U.S.A. (941028)
Local Field Service
Hardy has over 200 field technicians in the U.S., and more positioned throughout the
world to assist you in your support needs. We also have factory engineers who will
travel to your facility anywhere in the world to help you solve challenging applications. We're ready to support you with:
• Installation and start-up
• Routine maintenance and certification
• Plant audits and performance measurement
• Emergency troubleshooting and repair
To request Emergency Service and Troubleshooting, Start-up, Installation, Calibration, Verification or to discuss a Maintenance Agreement please call 800-821-5831
Ext. 1757 or Emergency Service after hours (Standard Hours 5:30 AM to 5:30 PM
Pacific Standard Time) and weekends
Ext. 1111.
Outside the U.S
Hardy has built a network of support throughout the globe. For specific field service
options available in your area please contact your local sales agent or our U.S. factory
at +1 858-292-2710, Ext. 1757.
1-2
CAUTION: UNPACK WITH CARE
WHEN UNPACKING, DO NOT DISCARD THE PACKING CASE OR ANY PACKING MATERIAL, UNTIL THE
CONTENTS OF THE PACKING CASE ARE
INSPECTED AND CAREFULLY COMPARED WITH
THE SHIPPING DOCUMENTS.
IF ANYTHING IS UNSATISFACTORY, PLEASE
NOTIFY HARDY PROCESS SOLUTIONS IMMEDIATELY BY CALLING, FAXING OR E-MAILING TO:
Customer Support Department
HARDY PROCESS SOLUTIONS, INC.
9440 Carroll Park Dr., Ste 150
San Diego, California 92121
Phone: (800) 821-5831
(858) 278-2900
FAX: (858) 278-6700
E-mail: hardysupport@hardysolutions.com
Web Address: www.hardysolutions.com
A RETURN AUTHORIZATION NUMBER IS REQUIRED
BEFORE RETURNING ANY DAMAGED PRODUCT.
CALL THE CUSTOMER SUPPORT DEPARTMENT TO
GET THE NUMBER. YOUR COMPANY NAME,
ADDRESS, TELEPHONE NUMBER, SERIAL NUMBER
OF THE UNIT AND A BRIEF DESCRIPTION OF THE
PROBLEM SHOULD BE READY WHEN CALLING.
IN CASE OF DAMAGE DUE TO SHIPPING, NOTIFY
THE DELIVERING CARRIER IMMEDIATELY FOR AN
INSPECTION.
Table of Contents
Table of Contents
General Information - - - - - - - - - - - - - - - - - - - - - - - - Page 1
Three Load Point Types - - - - - - - - - - - - - - - - - - - - - - Page 1
Unpacking - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Page 3
Installation of the Ground Strap - - - - - - - - - - - - - - - - - - - Page 3
Site Preparation - - - - - - - - - - - - - - - - - - - - - - - - - - P a ge 5
Precautions - - - - - - - - - - - - - - - - - - - - - - - - - - - - Page 6
Basic Engineering Principles for
Positioning Load Point Assemblies - - - - - - - - - - - - - - - - - Page 6
Principle #1 - - - - - - - - - - - - - - - - - - - - - - - - - - P a ge 6
Principle #2 - - - - - - - - - - - - - - - - - - - - - - - - - - P a ge 6
Principle #3 - - - - - - - - - - - - - - - - - - - - - - - - - - P a ge 6
Principle #4 - - - - - - - - - - - - - - - - - - - - - - - - - - P a ge 7
Typical Mounting Arrangements - - - - - - - - - - - - - - - - - - Page 7
Round Vessel with 3 Load Point Assemblies - - - - - - - - - - Page 7
Round Vessel with 3 Load Point
Assemblies - Angle Config. #1 - - - - - - - - - - - - - - - - - Page 8
Round Vessel with 3 Load Point
Assemblies - Angle Config. #2 - - - - - - - - - - - - - - - - - Page 8
Square Hopper with 3 Load Point
Assemblies - Even Load Distribution - - - - - - - - - - - - - - Page 9
Square Hopper with 3 Load Point
Assemblies - Uneven Load Distribution - - - - - - - - - - - - - Page 9
Typical 4 - Load Point Assembly Installation - - - - - - - - - - Page 10
Typical 6 - Load Point Assembly Installation - - - - - - - - - - Page 10
Level Requirements - - - - - - - - - - - - - - - - - - - - - - - - Page 1 0
Stiffness - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Page 11
Installation Procedures - - - - - - - - - - - - - - - - - - - - - - - Page 11
Pre-Installation Procedures - - - - - - - - - - - - - - - - - - - Page 11
Installing Load Point Assemblies with
Anchor Bolts - - - - - - - - - - - - - - - - - - - - - - - - - Page 12
Installing the Base Plate - - - - - - - - - - - - - - - - - - - - Page 12
Installing the Top Plate to the Load Surface - - - - - - - - - - - Page 17
Adjusting the Anti-Lift Off Device - - - - - - - - - - - - - - - - - Page 20
Replacing the Load Sensor - - - - - - - - - - - - - - - - - - - - - Page 21
Troubleshooting - - - - - - - - - - - - - - - - - - - - - - - - - - Page 24
Physical Checks - - - - - - - - - - - - - - - - - - - - - - - - Page 24
Electrical Tests for Load Point
Assembly Problems - - - - - - - - - - - - - - - - - - - - - - Page 25
Zero Balance Test - - - - - - - - - - - - - - - - - - - Page 25
Bridge Resistance Test - - - - - - - - - - - - - - - - Page 25
Resistance to Ground Test - - - - - - - - - - - - - - - Page 26
i
HI HLPB SERIES LOAD POINT ASSEMBLY
Electrical Termination Cable Color Codes - - - - - - - - - - - - - - Page 26
Model Numbers - - - - - - - - - - - - - - - - - - - - - - - - - - Page 27
Three Leg Systems - - - - - - - - - - - - - - - - - - - - - - - Page 28
Four Leg Systems - - - - - - - - - - - - - - - - - - - - - - - Page 28
Specifications - - - - - - - - - - - - - - - - - - - - - - - - - - - Page 28
ii
OPERATION AND INSTALLATION MANUAL
Congratulations, on your purchase of the Hardy Process Solutions
Load Point Assembly. This product, is engineered to set a new standard in load point assemblies. Hardy combined new innovations with
previously extra cost features and just plain common sense features
and provided you with optimum performance unequaled anywhere.
General Information The Hardy HI LPB Hermetic Load Point System is
designed to provide accurate output in the most
demanding applications. The load sensor performance
exceeds IP68 and NEMA 6 Standards for Wash Down
Resistance.
The HI LPB Free Sliding Load Point System is
designed for use on medium capacity vessels. The pre
assembled Free Sliding Load Point System consists of
three (3) different low profile mount types (See Figs.
1,2,3) specifically designed to eliminate the effects of
unwanted forces and resulting in exceptional load
measuring accuracy.
Each load point consists of a stainless steel load sensor which is truly hermetically sealed (gauge area and
cable entry), Enhanced C2
bration, matched mV/V and mV/V/Ohm and a 1/4
inch conduit adapter. The load points are pre assembled at our factory eliminating any assembly in the
field. Each load point is fitted with a grounding strap
and anti-lift off protection. The load points mounting
hardware is available in either stainless or galvanized
steel.
®
Second Generation Cali-
Page 1
HI LPB SERIES LOAD POINT ASSEMBLY
Three Load Point Types
FIG. 1: FIXED PIN LOAD POINT
Page 2
FIG. 2: BUMPER PIN LOAD POINT
FIG. 3: FREE SLIDING PIN LOAD POINT
OPERATION AND INSTALLATION MANUAL
Unpacking • Do not remove the load point assembly from it’s
packaging until just before installation. Although
the load sensor is designed for harsh environments, it is a precision instrument and should be
treated as such.
• Inspect the box, packing and the load point
assembly for any signs of damage that might
occur during shipment. Since almost all of the
load point assemblies are shipped F.O.B. our factory, such damage is normally the responsibility
of the carrier and should be reported to them.
• LOAD SENSOR CERTIFICATION SHEETS
ARE AVAILABLE 24 HOURS A DAY AT
OUR WEBSITE: http://www.hardinst.com
• Write down the serial number(s) on the inside of
the back cover for reference when talking to
Hardy Customer Service. Store this information
in a secure dry location for future reference.
Installation of the
Ground Strap
Step 1. Cut the plastic strap that fastens the
ground strap to the Load Point Assembly.
Step 2. Remove the two shipping brackets from
the load point with a box-end wrench. (See
Fig. 4)
FIG. 4: REMOVING SHIPPING BRACKETS
Step 3. Remove the shipping brackets, which are
intended only for use during shipment
from the factory. They offer no protection
Page 3
HI LPB SERIES LOAD POINT ASSEMBLY
if you are shipping the vessel fully asssembled on the load points.
Step 4. Save the two shortest machine screws, the
ones that fasten the shipping brackets to
the base plate. Y ou will use these hex bolts
to install the ground strap. (See Fig. 1-4)
Step 5. Place one of the ground strap connectors
over the threaded hole in the base plate.
These are the ones that fastened the shipping bracket to the base. (See Fig. 5)
FIG. 5: GROUND STRAP INSTALLED
Step 6. Install the hex bolt. Tighten with a box end
wrench.
Step 7. Place the other ground strap connector
over the threaded hole in the top plate.
Step 8. Install the other hex bolt. Tighten with a
box end wrench.
Step 9. In the illustration we show the ground
strap installed on the left side when facing
the front of the load point assembly. However, you can install the strap on either
side if necessary.
NOTE: Do not connect the ground strap to the base plate on
the right side and to the top plate on the left side or
vice versa. Crossing over will interfere with the load
cell performance.
Page 4
OPERATION AND INSTALLATION MANUAL
Site Preparation • All mounting surfaces for the base and loading
plate must be level. The distance between the
mounting surface of the loading plate and base
must within 1/32” of the nominal height, “H”.
The Load Point Assemblies in a system must be
level to within +/- 0.5
o
.
• When mounting the base plate on concrete, use
grout to level the plate.
• Any welding should be done prior to installation
of the load points.
• Proper drainage must be provided to prevent the
load point assembly from standing in water.
Precautions • Always treat the Load Sensor as a precision
instrument. Leave the load point assembly in its
packaging until it is time for installation.
• NEVER CARRY OR SWING THE LOAD SENSORS BY THEIR CABLE.
• Never allow moisture to get into any inte rconnections.
WARNING • Load cell cable length has been calculated into
C2 calibration data. Hardy Process Solutions recommends that you do not cut your Advantage or
Advantage Lite load sensor cable, as your C2
accuracy will be affected and the warranty will be
voided.
Basic Engineering
Principles for Positioning
Load Point Assemblies
Principle #1 • Load Points Assemblies should be positioned
such that the load (weight) is distributed as
evenly as possible between each load point
assembly in the scale.
• When the installation does not allow even distribution of the load, select higher capacity load
point assemblies.
Page 5
HI LPB SERIES LOAD POINT ASSEMBLY
NOTE: All load point assemblies must have the same capacity
when used in one scale.
Principle #2 • All scales should include one fixed pin-load
mount, one bumper pin-load mount. All other
load point assemblies in a scale must be the freesliding mount.
Principle #3 • Place the fixed pin load mount and the bumper
pin load mount as far as possible from each other .
• The fixed pin load mount and the bumper pin
load mount must be mounted in the same longitudinal axis.
• In applications that use three load points it is
sometimes difficult to mount the fixed pin and
bumper load mounts in-line. Therefore the fixed
pin and bumper load mounts can be positioned at
o
a 45
angle from each other and 45o from the free
pin load mount. Please see the mounting diagrams below for more information.
Principle #4 • If possible the fixed pin load mount should be
installed such that the load mount is oriented in
the direction of travel (e.g. when under a conveyor, the load mount must be in the same longitudinal axis with the direction of the travel of the
conveyor). The load mount must be oriented in
the direction of any prevalent side force.
Typical Mounting
Arrangements
NOTE: You can orient the load point assemblies to meet your
system installation requirements. Load point assemblies can be rotated 360
o
in 90o increments. Examples
above are recommendations only. The only required
orientation is that the bumper load cell must point
either towards or directly away from the fixed load
point.
Use the load cell cable for the pointer to ensure that
the vessel cannot rotate and allow the cells to slide off
their mounts.
Page 6
Round Vessel with 3
F
S
B
120o120o120
o
F
S
B
<45
o
Load Point
Assemblies
OPERATION AND INSTALLATION MANUAL
FIG. 6: THREE LOAD CELLS IN ROUND
CONFIGURATION
Round Vessel with 3
Load Point
Assemblies - Angle
Config. #1
FIG. 7: ANGLE FOR FIXED AND BUMPER
LOAD CELLS IN ROUND CONFIGURATION
Page 7
HI LPB SERIES LOAD POINT ASSEMBLY
120
120
120
o
o
o
F
S
B
F
S
B
O
Round Vessel with 3
Load Point
Assemblies - Angle
Config. #2
FIG. 8: ANGLE FOR ALL LOAD CELLS IN
ROUND CONFIGURATION
NOTE: For three load point systems, the mounting locations
should be spaced120 degrees apart. For four load
point systems the mounting locations should be
spaced 90 degrees apart.
Square Hopper with
3 Load Point
Assemblies - Even
Load Distribution
Page 8
FIG. 9: ANGLE FOR FIXED AND BUMPER
LOAD CELLS IN SQUARE CONFIGURATION
Round Vessel with 4
Load Point
Assemblies
OPERATION AND INSTALLATION MANUAL
FIG. 10: FOUR LOAD CELLS IN ROUND
CONFIGURATION
FIG. 11: FOUR LOAD CELLS FACING
INWARD IN ROUND CONFIGURATION
Page 9
HI LPB SERIES LOAD POINT ASSEMBLY
F
S
B
Square Hopper with
3 Load Point
Assemblies - Uneven
Load Distribution
FIG. 12: ANGLE FOR THREE LOAD CELLS IN
SQUARE CONFIGURATION
NOTE: This configuration is an exception to the even load
distribution principle. Use this configuration in circumstances where you have several hoppers arranged
in close proximity to each other.
Typical 4 - Load
Point Assembly
Installation
FIG. 13: FOUR LOAD CELLS POSITIONED IN
A RECTANGULAR CONFIGURATION
Page 10
OPERATION AND INSTALLATION MANUAL
Typical 6 - Load
Point Assembly
Installation
FIG. 14: SIX LOAD CELLS POSITIONED IN A
RECTANGULAR CONFIGURATION
NOTE: In case there is some doubt concerning load point
assembly installation, contact your local Hardy
Dealer, or Hardy Application Engineering Department or Customer Support Department for assistance.
You can orient the load point assemblies to meet your
system installation requirements. All load point
assemblies can be rotated 360
o
in 90o increments. The
examples above are recommendations only.
Level Requirements For scales that must meet NIST Class 3 (OIML Class
3) specifications:
1. The base plate support surfaces must be
within 0.2 degrees (0.4mm/100mm)
2. The top plate support surfaces in the load
carrier must be within 0.5 degrees (0.9mm/
100mm)
For scales with accuracy requirements => 0.1%
1. The base plate support surfaces must be
within 0.4 degrees (0.08mm/100 mm)
2. T op plate support surfaces in the load carrier
must be within 1 degree (1.8mm/100mm)
Stiffness Load variations and external forces can cause support
surface level variations.
Page 11
HI LPB SERIES LOAD POINT ASSEMBLY
For scales that must meet NIST Class 3 (OIML Class
3) specifications:
1. Maximum base plate angle variation: 0.2
degrees.
2. Maximum top plate angle variation 0.5
degrees.
For scales that must meet accuracy specifications =>
0.1%
1. Maximum base plate angle variation 0.2
degrees
2. Maximum top plate angle variation 1 degree.
Installation Procedures
Pre-Installation
Procedures
Installing Load
Point Assemblies
with Anchor Bolts
Step 1. Position the base plates with load cells on
the support surfaces and line them up in
accordance with the basic principles for
positioning. (See Principle #2, pg. 6)
Step 2. We recommend scribing or marking a cen-
terline on the top plate. (See Fig. 15)
FIG. 15: MARKING THE TOP PLATE FOR
INSTALLATION
Check the outline drawing located on the www.hardysolutions.com site. The diagrams will give you the
Base Plate and Top Plate dimensions for the Load
Point Assembly you are installing, including the thru
Page 12
OPERATION AND INSTALLATION MANUAL
hole diameters and center distances. If you do not
have Internet access, contact your local Hardy Dealer
for a copy of the drawing.
Installing the
Base Plate
Step 1. Make sure that the concrete foundation is
level.
Step 2. To assist in the installation of the anchor
bolts we recommend creating a template
using the thru hole diameters of the top
plate mounting dimensions. For drilling
dimensions, see the drawings accessed
from the Products page on the Hardy Process Solutions web site. Note that the holes
for top and bottom are in direct alignment,
but the thickness of the top and bottom
plates differ.
FIG. 16: ANCHOR BOLTS EXAMPLE
Fig. 16 and Table 1 provide side dimensions and holediameters only.
Page 13
HI LPB SERIES LOAD POINT ASSEMBLY
Page 14
FIG. 17: BASE AND TOP PLATE DRAWINGS
TABLE 1: BASE & TOP PLATE DIMENSIONS
OPERATION AND INSTALLATION MANUAL
Step 3. Use wood or metal to create the templates.
The size of the template depends on the
size of the anchor bolts.
Step 4. Mark a point on the template. Use the thru
hole center distances from the I/I diagram
and measure to another point on the template which equals the center distance of
the thru holes on the base plate and make
another mark. Do this for each template.
Step 5. Drill the thru holes the same size as the
base plate thru holes at each of the marks
you made on the templates.
Step 6. Measure from where you want to center
the fixed-pin load point assembly’s top
plate on the vessel (or structural support
that will rest on the load point assemblies)
to the centers of where you want the centers of the top plates of the other load point
assemblies used in the weighing system.
Mark each center point location. Check the
typical mounting arrangements for load
point systems above.
Step 7. Place the center of the Anchor Bolt pattern
at the exact centers as measured in Step 6.
You can use the templates to assist in
locating these center points.
Step 8. When you place the Anchor Bolts into the
concrete foundation, slip the templates
over the anchor bolts so that the bolt center
distances will be the same as the base plate
thru holes of the load cell. You can leave
the templates on until after the concrete
drys or remove them when you think the
concrete has set to the point where the
anchor bolts won’t move.
Step 9. Make sure to leave room to install the
jacking nuts and washers. Y ou are going to
make the level adjustments with the jacking nuts. (See Fig. 18)
Page 15
HI LPB SERIES LOAD POINT ASSEMBLY
FIG. 18: INSTALLING THE FOUR ANCHOR
BOLTS FOR THE BASE PLATE
Step 10. Install the correct size Jacking Nuts onto
the Anchor Bolts so there is about 1/2 inch
between the concrete foundation and the
jacking nuts. Don’t worry about level at
this point, you will level everything after
the Load Point Assembly/base plate is
Installed.
Step 11. Install four flat washers on each anchor
bolt above the jacking nuts.
Page 16
Step 12. Slide the load point assembly/base plate
onto the anchor bolts. You can install the
load point assemblies in one of four orientations. (See Fig. 19) Notice we used the
Free Sliding Load Point Assembly for this
illustration but you can do the same with
any of the load point assembly types.
FIG. 19: LOAD POINT ORIENTATION
OPERATION AND INSTALLATION MANUAL
Step 13. Use a small spirit (bubble) level and check
to see if the load point assembly is level
side to side/corner to corner. Use a box end
wrench to adjust each of the jacking nuts
until each load point assembly in the system is level.
Step 14. Install the base plate nuts. (See Fig. 9)
Tighten them finger tight. You may need
to adjust the jacking nuts later as you
install the rest of the load point assemblies
for the weighing system.
Step 15. If you replaced a loading pin or load cell,
make sure you:
• Grease the sliding pin. Grease the fixed
pin and the fixed pin housings in the top
plate and the load cell.
• Wipe the stainless plate on the under
side of the top plate clean and check to
see that the stainless plate is free of
scratches or other damage. Replace the
Stainless plate if scratched or damaged.
Step 16. Install the rest of the load point assemblies
according to the Positioning Principles.
(See Principle #2, pg. 7)
NOTE: Load variations and external forces can cause sup-
port surface level variations.
Step 17. Check all the installed load point assem-
blies for level and make adjustments
according to the following base plate level
requirements.
Installing the
Top Plate to
the Load
Surface
Step 1. You should have scribed or marked a cen-
terline on the top surface of the top plate to
locate the center. (See Fig. 6)
Step 2. Mark the point you want the center of the
top plate to be located on the support
bracket. Place the top plate center over the
support bracket mark and tack weld the
Page 17
HI LPB SERIES LOAD POINT ASSEMBLY
top plate to the support bracket. If you
want to use fasteners to fasten the top plate
to the support bracket, use a marker or
scribe and trace the thru hole pattern of the
top plate on the support bracket. Drill four
thru holes or drill and tap four holes for the
fasteners. Install the top plate to the support bracket using the four fasteners.
Step 3. With the top plates installed, put the vessel
support bracket with the top plate onto the
pins of the load cells. Make sure that the
sliding load cell pins are riding on the
stainless plate. Make sure that the fixed
pin is centered in the top plate housing.
The horizontal position is not critical but
the vertical position is. Use the C dimensions to determine the proper height
between the support surface and the top of
the top plate. (See Fig. 20)
Step 4. Level the installed load point assemblies
and make adjustments according to the
following top plate level requirements.
Page 18
FIG. 20: HEIGHT DIMENSION C
MODEL # HEIGHT C
HI LPB44-43
HI LPB110-43
HI LPB225-43
HI LPB450-43
3.149”
(80)
TABLE 2:
OPERATION AND INSTALLATION MANUAL
Step 5. To adjust the level of the top plate use
shim stock between the top plate and the
support bracket. (See Fig. 21)
FIG. 21: LEVELING WITH SHIM STOCK
Step 6. If the top plate is tack welded to the sup-
port bracket and you can lift the vessel off
the load cell pins, finish welding the top
plate to the support bracket and lower the
vessel back onto the sliding loading pins.
If you cannot lift the vessel, be sure to
shield the entire load cell and cable from
any slag that might drop.
WARNING Under no circumstances must welding current be
allowed to pass through the load sensor. To do so
will destroy the load sensor and could possibly
cause personal injury and/or property damage.
Step 7. Pour grout up to the bottom surface of the
base plate and let dry.
Adjusting the Anti-Lift
Off Device
FIG. 22: ADJUSTING ANTI-LIFT OFF DEVICE
Page 19
HI LPB SERIES LOAD POINT ASSEMBLY
Step 1. Use a box end wrench to loosen the adjust-
ment hex nut that fastens the Anti-Lift Off
Device to the top plate. (See Fig. 22)
Step 2. Adjust the hex screw with your fingers or
box-end wrench until the gap between the
base plate and washer are between .0785”
(2mm) and .1570” (4mm). (See Fig. 22)
Step 3. Use a box-end wrench and tighten the
adjustment hex nut.
Replacing the Load
Sensor
Step 1. Use a box-end wrench to loosen the nut
that fastens the anti-lift off device to the
top plate. Remove the anti-lift off device.
(See Fig. 23)
Step 2. Use a box-end wrench to remove the two
hex bolts that fasten the ground strap to the
top plate and the base plate. Remove the
ground strap.
Step 3. Jack up the vessel support leg and lift off
the top plate.
Step 4. Remove the two load sensor bolts that fas-
ten the Load Sensor to the base plate with
a box-end or crescent wrench. (Fig. 23)
Page 20
FIG. 23: EXPLODED ISO VIEW OF FREE
SLIDING LOAD POINT ASSEMBLY
Step 5. Remove the old load sensor.
OPERATION AND INSTALLATION MANUAL
Step 6. Align the Load Cell bolt thru holes with
the threaded base plate bolt holes.
Step 7. Screw the two Load Cell Bolts into the
base plate until they are finger tight only.
Step 8. The height (B) dimension, 2.36”, is the
minimum required service area above the
load cell baseplate to remove the load cell
bolts.
FIG. 24: B DIMENSION
Step 9. Use a torque wrench and tighten the bolt
farthest from the cable end first. Then
tighten the bolt nearest the cable end.
Torque to 18.44 foot pounds (25Nm).
Step 10. Inspect the Stainless Plate for scratches or
damage. If there are scratches or damage:
• Use a box end wrench and remove the
two hex machine screws that fasten the
stainless plate to the top plate.
• Discard the old stainless plate.
• Place the stainless plate so that the thru
holes are aligned with the threaded holes
in the top plate.
• Use a box end wrench and replace the
two hex machine screws.
• Lower the vessel down onto the load
points.
• Reinstall the ground strap and ant i-l ift
off device. (See Fig. 23)
Page 21
HI LPB SERIES LOAD POINT ASSEMBLY
Troubleshooting
Physical Checks Before doing any electrical tests do the following:
Step 1. Visually inspect each load point assembly
for physical damage. Look for distortions
or cracks in all metal parts.
Step 2. Check all welds to be sure they are not
cracked of have deep pot marks.
Step 3. Check all cables for cracks, cuts or crimp-
ing. Check for any abrasions on the cables.
Step 4. Look for structural changes in the scale or
supporting structures.
Step 5. Look for binding of any kind on the load
point assembly.
Step 6. See the Hardy Controller Manual for infor-
mation on how to troubleshoot using Integrated Technician. For your convenience,
manuals are available on the Hardy Web
site. Go to http://www.hardysolutions.com. and select the Support page. If
you do not have access to the internet, contact your local Hardy Representative for
information as to where to get this and
other manuals for Hardy products.
Electrical Tests for
Load Point
Assembly Problems
Zero Balance
Test
Page 22
Step 7. Get the Load Sensor certification sheets
for referencing while troubleshooting. The
certifications are available to you 24 hours
a day at our Web Site: http://www.hardysolutions.com
If you find any of the problems stated above, replace
the part that is damaged.
Problem: Changes in the Zero Balance.
Cause: Load Cell has been overloaded.
Remedy:
OPERATION AND INSTALLATION MANUAL
Step 1. Use a millivolt meter or Integrated Techni-
cian feature (See Physical Checks, Step 6)
and measure the LPS output under “no
load” conditions. The reading should be
less than 1% of the full scale output.
NOTE: Sensors can shift up to about 10% of their full scale
and still function correctly.
Step 2. If the output has shifted more than 1%,
replace the sensor.
Assumption: A 5VDC excitation on a sensor with a
3mV/V output sensitivity, a 1% shift in zero balance
will yield a 0.1 mV/V change from the specification.
Bridge
Resistance Test
Resistance to
Ground Test
Problem: Changes in Bridge Resistance
Cause: Failure of a compensating element, or by a
broken or burned bridge wire. Often cause by an electrical transient such as lightning.
Remedy:
Step 1. Use an Ohmmeter and measure the resis-
tance between the EXC + and EXC- leads.
The value for the EXC leads should be
1106 ohms + - 5 ohms.
Step 2. Use an Ohmmeter and measure the resis-
tance between the SIG + and SIG - leads.
The value for the SIG leads should be
1,000 ohms + - 1 ohm.
Step 3. Readings that exceed the ranges indicated
suggest damage and the load cell should
be thoroughly inspected or replaced.
Problem:Electrical leakage is creating an
unstable output from the instrument.
Cause: Water contamination in the load
sensors or cables.
Page 23
HI LPB SERIES LOAD POINT ASSEMBLY
Remedy:
Step 1. Tie together the load sensor excitation (2),
signal (2) and ground (1) wires.
NOTE: Be careful NOT to include the two C2 wires.
Step 2. Use a megohmmeter and measure the
resistance between all five wires tied
together and the load cell metal body. The
measured value should be 5,000 megohms
or more.
WARNING WHEN USING A MEGGER DO NOT EXCEED
50 VOLT RANGE.
Step 3. If the sensor fails this test remove the
ground wire and test with only the four
live leads.
Step 4. If the sensor passes the test an insulation
problem in the cable is most likely.
Step 5. Replace the load cell if the cell fails both
tests.
Electrical Termination
Cable Color Codes
Page 24
The cable is 6 conductor, shielded (floating) and 10
feet in length.
EXC+ Red
EXC - Black
SHIELD Yellow
C2+ Gray
C2- Violet
SIG + Green
SIG - White
OPERATION AND INSTALLATION MANUAL
Model Numbers
NOTE: The -43F/B/S indicates a stainless steel load sensor
with stainless steel mounting hardware. For galvanized mounting hardware use -45 F/B/S
Capacity Model # Model # Model #
LBS Kn Fixed Assembly Bumper Assembly Slider Assembly
44 0.2 HI LPB44-43F HI LPB44-43B HI LPB44-43S
110 0.5 HI LPB110-43B HI LPB110-43B HI LPB110-43S
225 1 HI LPB225-43F HI LPB225-43B HI LPB225-43S
450 2 HI LPB450-43F HI LPB450-43B HI LPB450-43S
TABLE 3: MODEL NUMBERS & CAPACITIES
Model Number
Spare Load Sensor
HI BBH06-44 HI BBHO6-225
HI BBHO6-110 HI BBHO6-450
TABLE 4: SPARE LOAD SENSORS
Three Leg Systems
Model # Pounds Kgs
HI 3B132-43 132 60
HI 3BB330-43 330 150
HI 3B675-43 675 306
HI 3B1.35K-43 1.35 K 612
To tal Capacity
TABLE 5: THREE LEG SYSTEMS
Page 25
HI LPB SERIES LOAD POINT ASSEMBLY
Four Leg Systems
To tal Capacity
Model # Pounds Kgs
HI 4B175.5K-43 175 79
HI 4B440-43 440 200
HI 4B880-43 990 408
HI 4B1.8K-43 1.8K 816
TABLE 6: FOUR LEG SYSTEMS
Specifications
Operating Specifications
Rated Output (F.S.) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2+-0.002mV
Non-Linearity- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +-0.018% R.O.
Hysteresis - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - <-0.025% R.O.
Zero Balance - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - <+-1.0% R.O.
Creep @ 5 Min. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - <+-0.01% R.O.
Temp Effect Output- - - - - - - - - - - - - - - - - - - - - - - - - - - - - <+-0.0014% R.O./C
Temp Effect Sensitivity - - - - - - - - - - - - - - - - - - - - - - - - - - <+-0.0007% R.O./C
Input Resistance - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1050 to 1200 ohms
Output Resistance - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1000 +- 1 ohm
Insulation Resistance - - - - - - - - - - - - - - - - - - - - - - - - - - - - >5000 megohms
Excitation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-15VDC
Safe Load Limit - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 200% Emax
Ultimate Load - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 300% Emax
Safe Side Load - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 100% Emax
Environmental Specifications
Operating Temperature - - - - - - - - - Minus 40
Compensated Temperature - - - - - - - 14
o
F to Plus176o F (-40o C to +80o C)
o
F to 104o F (Minus 10o C to Plus 40o C)
Load Sensor Material- - - - - - - - - - - 17-4PH Martensitic (Magnetic) Stainless Steel
Load Sensor Fittings - - - - - - - - - - - Coated Tool Steel
Top Plate & Base Plate Material - - - 316 Stainless Steel or Galvanized Steel
Conduit Adapter - - - - - - - - - - - - - - .250-18 NPT
Hermetic Sealing
Gauging Area - - - - - - - - - - - Welded Cylindrical Sleeve
Cable Entry- - - - - - - - - - - - - Glass to Metal Header
Page 26
OPERATION AND INSTALLATION MANUAL
Print the unit serial number and model number for reference when ordering
parts for the HI LPB Load Point Assembly
The serial number can be found on the side of the load sensor, or by entering the
SelfTest Mode.
Scale Name/Location:
Model Number:
Serial Number 1:
Serial Number 2:
Serial Number 3:
Serial Number 4:
Serial Number 5:
Serial Number 6:
Serial Number 7:
Serial Number 8:
Page 27
Loading...