Rice Lake SURVIVOR PT User manual

53280
SURVIVOR PT
Pit-Type Truck Scale
Assembly Instructions
®

Survivor® PT Pit-Type Truck Scale Assembly Instructions

Technical training seminarsare available through Rice Lake Weighing Systems.
Course descriptionsand datescan be viewed at www.ricelake.com or obtained
by calling 715-234-9171 and asking for the training department
© 2007 Rice Lake Weighing Systems. All rights reserved. Printed in the United States of America.
Specifications subject to change without notice.
February 2007
Contents
Introduction.............................................................................................................................................. 1
1.0 Installation ................................................................................................................................... 1
1.1 Foundation Slab Cure Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Assembly Time Estimates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.3 Recommended Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.4 Lifting and Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.5 Temporary Setting Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2.0 Assemble Deck Modules ............................................................................................................. 3
2.1 Place End Module A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.2 Place and Attach Center Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.3 Install Outriggers and Deck Coping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.4 Level Module Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.0 Load Cell Mount Installation........................................................................................................ 6
3.1 Attach Upper Mount Chair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2 Prepare Baseplate and Mount Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.3 Raise Mount into Final Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.4 Attach Flexible Conduit Sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.4.1 Attach Grounding Strap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.4.2 Install Lower Module Assembly Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.5 Install Anchor Bolts and Grout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.6 Install Support Bars, Corrugated Metal, and Deck Rebar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.6.1 Corrugated Metal Sheeting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.7 Deck Rebar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.0 Pour and Finish Concrete Deck ................................................................................................... 9
4.1 Optional Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.0 Install Cabling in Conduit .......................................................................................................... 11
5.1 Load Cells to Junction Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.2 Junction Box to Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.3 Indicator to Peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.4 Single-Point Ground Conductor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.5 Junction Box Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.6 Electrical Ground Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.7 Install Transient Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.0 Trimming and Calibration.......................................................................................................... 15
6.1 Overview and Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.2 Trimming Individual Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.3 Trimming Paired Sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.4 Calibration with Test Weights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.0 Load Cell Replacement.............................................................................................................. 18
7.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.2 Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8.0 Vehicle Scale Limited Warranty ................................................................................................ 19

ii Survivor® PT Pit-Type Truck Scale Assembly Instructions

Installation 1
Introduction
This manual is intended for use by technicians
responsible for installing and servicing the PT
Pit-Type series truck scale. You will find that the PT
Pit-Type truck scale has been designed so that your
on-site installation time is reduced as much as
possible. A well-organized, experienced installation
crew should be able to install a typical 70’x 11’ truck
scale in one day.
NOTE: This booklet covers the PT Pit-Type truck scale
installations. Use these instructions as general installation
guidelines unless the engineering drawings furnished with
your scale differ from the instruction in this booklet.
Engineering drawings furnished with your scale always take
priority over these general installation guidelines.
Refer to the engineering drawings furnished with the scale for
all component numbering sequences.
Authorized distributors and their
employees can view or download this
manual from the Rice Lake Weighing
Systems distributor site at
www.ricelake.com.
1.0 Installation
The modular sections of the SURVIVOR®PT Pit-Type truck scale are shipped pre-assembled and ready to be
placed into position on temporary setting blocks using a crane capable of handling 10,000 lbs. The individual
modules are bolted together and the deck is leveled in final position flush with the top of the pit. Mounts are
shipped pre-assembled with load cells, adapters, and flexible conduit sections attached. Mounts are installed to
the level of the deck, then anchored and grouted to the foundation. Cabling is run in conduit and electronic
equipment connected to finish the installation.
The general assembly order is summarized below:
1. Set deck modules into position on setting blocks and bolt deck modules together.
2. Install outriggers and deck channel coping.
3. Place deck into final position even with top of pit.
4. Assemble mounts with load cells to the deck unit; remove setting blocks.
5. Install mount anchor bolts and grout beneath mount plates.
6. Install corrugated sheet metal, rebar and pour concrete.
7. Run cabling through conduit; make electrical connections.
8. Connect indicator and peripheral devices.
9. Calibrate scale.
1.1 Foundation Slab Cure Period
Standard concrete reaches full strength after a 28-day cure. Note that the concrete foundation must cure in a
moist state for at least seven days (three days for high-early concrete). At seven days, standard concrete is
approximately 75% of its maximum strength and can handle moderate loads. Loading of a slab before it reaches
75% of maximum strength may damage the foundation.
1.2 Assembly Time Estimates
When scheduling installation for a typical three-section, 70' truck scale, plan for a two-hour minimum crane
rental to position the sections.
A two-man crew, aided by a crane operator, can unload modules from the truck, place them into position and bolt
them together in one to two hours. Mount and load cell installation requires approximately two hours. All
electrical wiring and final connections can normally be completed the same day.
Note: These estimated times may vary.

2Survivor® PT Pit-Type Truck Scale Assembly Instructions
1.3 Recommended Tools and Equipment
The following is a list of recommended tools and equipment necessary to assemble and install the SURVIVOR®
PT Pit-Type truck scale:
• One heavy duty crane, equipped with chains
or cables, for module placement;
• Rotary hammer drill (3/4");
• Drill with 5/16" socket for installing sheet
metal screws through corrugated sheeting;
• Carbide masonry bit (3/4" x 30");
• Two low-profile, four-ton hydraulic jacks;
• Setting blocks (12-1/4") and shims to total
13-3/4" height;
• Torque wrench (800 ft-lb);
• Socket wrenches to 1-5/8" (drive compatible
with torque wrench);
• Box end wrenches to 1-1/2";
• Open end wrench set (7/16"-3/4");
• Four-foot bubble or construction level
(transit);
• Small torpedo level;
• Spacers for deck-to-pit wall alignment;
• Hammers, maul, pry bar;
• Hand tools for pulling and connecting
electrical wiring and sheet metal cutting and
trimming.
1.4 Lifting and Handling
The top module can be lifted using four chains attached to the four lift lugs
provided with the scale. Once the first module is removed from the truck and is
placed on the setting blocks, the four lift lugs can be removed and used for lifting
and positioning the other modules.
NOTE: Rice Lake Weighing Systems will credit the customer for the return of the four lift lugs.
Please call for an RMA number.
1.5 Temporary Setting Blocks
Most installers use 12-1/4" temporary setting blocks for initial module
positioning and to aid in installing deck module bolts. When an end module
is placed into position on the setting blocks, the top of the module will be
6-1/3" below the top of the pit. The outriggers and deck coping are assembled
before the load cells mounts are installed and will bring the top of the scale to
approximately 1/3" below the top of the pit. Shims are added during final
leveling to raise the deck surface the last 1/3".
NOTES:
• Please refer to the construction prints included with the SURVIVOR® PT
Pit-Type truck scale to confirm all foundation and scale dimensions.
• Do not place the setting blocks in the location on the piers where the load cell mounts are to be placed.
7.5"12.25"
42.5"
23.92"
6.33"
Figure 1-1. Setting Block Diagram.

Assemble Deck Modules 3
2.0 Assemble Deck Modules
The modules are designated either as an end module
or a center module. All two-module scales will have
two end modules, while longer scales will have two
end modules and one or more center module (see
diagram below).
Figure 2-1. Center and end modules.
In a three module scale, the end module is the first to
be positioned on setting blocks followed by the center
module. The last module to be assembled is an end
module. Scales with more than threee modules will
have additional center modules installed. As an
example, a 100' scale would have two end modules
and three center modules.
2.1 Place End Module A
Place one 12-1/4" temporary setting block on the top
of each pier and position them so that they will not
interfere with the installation of the load cell mounts.
The scale module should be 3/4" away from the
bulkhead ramp and 3/4" from each pit wall side (see
figure on right). By using the 12-1/4" blocks, the top
of the main beam will be approximately 6-1/3" below
the top of the pit.
2.2 Place and Attach Center Module
NOTE: To assist in easy assembly of the center module, make
sure that both modules have direct end-to-end surface
contact.
1. Place four 12-1/4" setting blocks on top of the
piers in the center sections.
2. Position and place the center module on the
setting blocks, making sure that both the end
module and center module end plates are
aligned.
3. Check that the module is centered side-to-side
in the pit.
NOTE: At the installer’s discretion, install the center section
with the J-box on the near side to the scale house.
4. When both modules are aligned, insert the top
three 1-1/8" bolts with flat washers, lock
washers and nuts on the outside of the beam.
(Leave out the bottom bolt to facilitate load
cell mount installation).
NOTES:
• Tighten bolts and nuts finger tight until all modules
are in place.
• A long pry bar can be used to make small
adjustments in module alignment, but it is easier to
leave the second module attached to the crane for
making small alignment changes.
5. Install the three top bolts, washers and nuts on
the inside of the beam. Install the bolts,
washers and nuts on the opposite beam using
six bolts, washers and nuts. Tighten only
finger tight.
NOTE: Do not install the bottom bolt at this time.
Figure 2-2. Top bolts, washers, and nuts installed.
6. If required, place and install any additional
center modules in a similar manner.
7. Install the remaining end module on four
setting blocks ensuring the end beams are
aligned with and in direct surface contact with
the center module.
Figure 2-3. Module installation.
8. Center the module side-to-side and check that
the end of the main beam is 3/4" from the end
of the concrete pit wall. Install and tighten the
three top bolts on each beam (inside and
outside) finger tight as in the previous
operation.
NOTE: Do not install the bottom bolt at this time.
CENTEREND END

4Survivor® PT Pit-Type Truck Scale Assembly Instructions
9. To reduce the on-site crane operating time, the
manhole frame (shown in photograph on
right) can be installed at this time. It is
recommended to locate the frame in a central
location close to the J box as shown in the
diagram below.
Figure 2-4. Manhole frame.
NOTES: Before installing the manhole frame, remove a section of the corrugation support bar in the location where the manhole
frame is to be installed. Additional manholes are available as options. Consult with local weights and measures officials for any
state restrictions or access in the state being installed.
OSHA may have restrictions on pit access. Consult with customer’s safety engineers for details.
Figure 2-5. Optimal manhole frame location.
2.3 Install Outriggers and Deck
Coping
1. Install the outriggers on each module section
(as shown on below) using the 3/4" x 2-1/2"
bolts, washers and nuts at the locations shown
on the drawing. Torque all bolts to 260 ft-lb.
Figure 2-6. Outrigger location
2. Position an L-shaped deck coping on top of
the outriggers and secure it to the module
frame using the 1/2" x 2" bolts, nuts and
washers.
3. Assemble the center section deck coping to
the end channels using four 2-1/2" bolts,
washers and nuts.
4. Attach the third module deck coping to the
center section and to the end of the module
assembly.
NOTE: To compensate for irregularities in pit dimensions, 1/2"
shims are provided with the truck scale kit assembly. These
shims are to be inserted (if required) between the coping
attach points and the module frame assembly.
5. Repeat procedure for the opposite side.
Recheck module assembly to see if it is
centered side-to-side in the pit.
Figure 2-7. Optional shim placement
As an optional recommended procedure, and to make
the module deck coping more rigid, each deck coping
may be tack welded to the outrigger at each contact
location. It should be noted that during the concrete
pour the deck coping may bow outward towards the
pit walls. To maintain a 3/4" gap between the deck
coping and the side of the pit, it is recommended that
temporary spacers (3/4" bolts or shim stock) be used
Manhole Frame
(24" square)
Top View
To Scale House
Suggested Location of Manhole
Junction Box
Corrugation Support Bar
(remove material as needed
to install manhole frame)
Outrigger
1/2" Shims Installed
Here if Required

Assemble Deck Modules 5
between the deck coping and the pit wall. Remove spacers after the concrete has set and before the scale is put
into service.
NOTE: Install the 3/4" bolts or shim stock and space at equal intervals between the deck coping and the pit wall coping before
welding as shown in the drawing on the right.
2.4 Level Module Assembly
Using a suitable jack and shims, raise each module section so that the top of the deck coping is level with the top
of the pit. After raising module assembly, re-check module alignment to make sure that the top is level and
centered side-to-side in the pit.

6Survivor® PT Pit-Type Truck Scale Assembly Instructions
3.0 Load Cell Mount Installation
Load cell mounts, complete with load cells and
conduit adapters, have been assembled at the factory
to save on-site installation time. Load cell mount
installation consists of sliding the complete unit into
place beneath the deck, raising the mount with the
leveling screws to the deck, and connecting the
grounding strap.
When installing load cell mounts, start at one corner
of the module assembly and install the remaining load
cell mounts on that side. Likewise, when the load cell
mounts are installed on the other side, start with the
corner of the module assembly.
The lower mounts assemblies come complete with
load cells installed, so complete any necessary
welding on the scale before installing mounts.
NOTE: Remove load cell mount from packing box and file
printed load cell Certification of Conformance (CC) in a safe
place for future reference.
3.1 Attach Upper Mount Chair
1. Attach the upper chair to the bottom of the
module assembly by using four 3/4" bolts
with washers making sure that the 1/4" hole
for ground strap installation is toward the
center of the scale module.
Figure 3-1. Upper chair bolts installed.
2. Torque upper chair bolts to 260 ft-lb.
3.2 Prepare Baseplate and Mount
Installation
1. Turn the four levelling screws through the
baseplate so approximately 1/2" extends
beyond the bottom surface.
2. Each load cell mount comes equipped with a
90-degree threaded LB conduit adapter.
Orient the adapter so that the cable will point
toward the inside of the scale when mounted.
NOTE: Each mount must be oriented so the cable exit from
the load cell is facing the interior of the module to which it will
be attached. The correct orientation will place the flexible
conduit section on the load cell near the rigid conduit attached
to the weighbridge.
3. If a load cell must be reversed to achieve
correct orientation, remove a load cell and
reverse its direction in the field. When
retightening load cell bolts, torque to 70 to 80
ft-lb. The 90 degree fitting on the flexible
conduit attached to a load cell can rotate 180
degrees to allow for correct conduit
placement.
4. Set the mount assembly on the concrete pier
directly in front of its final position. Carefully
slide the mount into position under the upper
chair.
3.3 Raise Mount into Final Position
1. Turn the leveling screws to raise the mount
until the link is centered in the chair bearing
and lightly touching.
2. Level the plate in both directions.
3. When the baseplate is directly under the chair,
the link will be hanging vertical when
centered in the chair (see figure on left).
Approximately 1/4" of the link should
protrude (see figure below) beyond each side
of the chair.
Figure 3-2. Final mount position.
4. If adjustment is necessary, tap baseplate edges
lightly with a hammer to slide the entire
mount sideways.
Figure 3-3. Load Cell Mount Parts.
UPPER CHAIR
LINK
1/4" PROTRUSION
LOAD CELL
LEVELING SCREW
BASEPLATE
1/2"

Load Cell Mount Installation 7
3.4 Attach Flexible Conduit Sections
A 30" section of flexible conduit (shown in the photo
below) is included on each load cell.One end is
threaded for mating with the LB connector at the load
cell. The other end adapts to 3/4" galvanized rigid
conduit.
Figure 3-4. Flexible conduit.
NOTE: Flexible conduit may also be plastic-coated metal (flex
conduit).
3.4.1 Attach Grounding Strap
1. Remove the 1/4-20 hex bolt with washer in
the upper chair. Use this bolt to attach the
braided grounding strap to the upper chair as
shown below.
Figure 3-5. Grounding Strap Location.
2. Attach lower end of grounding strap to either
one of the two holes in the baseplate.
3.4.2 Install Lower Module Assembly Bolts
Upon completing the load cell mount installation, the
lower module assembly bolts can be installed at each
location. Torque all module assembly bolts to 800
ft-lb.
3.5 Install Anchor Bolts and Grout
Anchor Bolts
Each mount requires two anchor bolts to prevent
lateral motion. Two 7" x 3/4" anchor bolts with
expansion heads are supplied with the scale for each
load cell. The anchor bolts are installed in holes in
each module pier.
1. Use an industrial hammer drill with a 3/4"
carbide masonry bit at least 36" long to drill
anchor bolt holes. This long bit allows the
drill body to clear the siderail so the hole can
be drilled nearly vertical. Hold the bit as close
to vertical as possible and drill a 3/4" hole at
least 6" into the concrete pier beneath each
anchor bolt slot on both sides of the baseplate.
2. Place a washer and nut on each anchor bolt.
Use a 24" long driver pipe with an inside
diameter slightly larger than the 3/4" bolt
(shown in the illustration below) to drive
anchors into the drilled holes until the washer
is solid against the baseplate.
NOTE: Do not apply excessive force to the anchor bolt.
Bending of the baseplate could occur.
Figure 3-6. Drive anchors into drilled holes.
Grouting
1. Erect temporary dams around each baseplate
and inject 9000 psi non-shrinking, epoxy/
cement grout.
2. Take care not to leave air voids; the baseplate
must have even support from continuous
grout contact.
NOTE: After the grout has hardened, tighten anchor bolt nuts
until the heads expand and the bolts are solidly anchored.
Figure 3-7. Grout example.
Grounding Strap
Attachment
Point
NOTE: Do not drive anchor bolt
without driver pipe.

8Survivor® PT Pit-Type Truck Scale Assembly Instructions
3.6 Install Support Bars, Corrugated
Metal, and Deck Rebar
3.6.1 Corrugated Metal Sheeting
To support the concrete deck pour, 26-gauge
galvanized corrugated metal sheeting (15/16" by 3-3/
4" wide corrugations) is installed on the main frame
assembly. The panels are installed perpendicular to the
cross beams and rest on the cantilever support
channels, the main beams, and the frame cross beams.
1. Install the sheet metal starting below the
Nelson studs along one side of the frame.
2. Form the sheet metal to the contour of the
frame assembly and overlap adjoining panels
a minimum of 15" or four full corrugations.
Figure 3-8. Installation of Support Bars, Corrugated
Metal, and Deck Rebar.
Panels must fit closely to the vertical webs of all
support beams to prevent concrete runout during the
deck pour.
3. Trim sheet metal as needed for clearance
around any vertical gussets in the support
beams and around the manhole on the cross
beams. The photograph below shows the
metal sheeting used on a EZ-SR truck scale
installation.
Figure 3-9. Metal sheeting example.
NOTES:
•Secure the corrugated metal sheet to the manhole
frame by installing 12 sheet metal screws (or tack
weld) around base of manhole frame.
• When pouring concrete, make sure that concrete is
poured over the overlap not into the overlap.
3.7 Deck Rebar
Concrete deck reinforcing consists of installing #5
rebar on 12" centers at the locations shown on the
drawing along with using standard construction
practices.
NOTE: At the installer’s discretion, rebar may or may not be
tied together.
The first (bottom) layer of rebar installation consist of
positioning 6'-3" rebars perpendicular to the main
beams and on 1-1/2" chairs (bolsters) located on top of
the corrugated sheet metal. On top of this rebar layer,
a second layer (70' rebar) is installed perpendicular to
the first layer and parallel to the main beam.
The third layer will be the 2' rebar placed on chairs.
On top of these will be another layer of 70' rebar
running the length of the frame assembly.
The final two layers will require installing 9'-4' rebar
on the appropriate chairs. On this will be the top layer
of 70' rebar.
CHANNEL
NELSON STUD
CANTILEVER SUPPORT
MAIN BEAM
CROSS BEAM
CORRUGATED METAL
MINIMUM OVERLAP
(DRAWING NOT TO SCALE)

Pour and Finish Concrete Deck 9
4.0 Pour and Finish Concrete Deck
With a concrete crew of three experienced workers, a 70' by 10' scale can be
poured and finished in approximately three hours. Access to only one side of
the scale is necessary as most concrete trucks carry extension chutes at least
16' long. If possible, order concrete in front-unloading trucks. The truck will
be moving slowly while filling; the improved driver-visibility with
front-unloading makes that process faster and more accurate.
To protect against unsightly concrete splatters on the top of the support
channels, mask off the top of the channel with tape or use 4 to 6 mil plastic to
cover the top surface.
Position the unloading chute at the near left side of the scale and begin filling
having the truck move slowly to the right.
To ensure concrete flowing evenly into the frame and encasing all Nelson studs and
rebar, a concrete vibrator is highly recommended. These units are available for rent
at most construction equipment rental sources. They work very quickly to level
concrete, settle out surface stones, and leave a stone-free layer at the top surface to
make finishing easier.
After vibrating to approximate level, screed the concrete to the level of the top
of the support channels with a 2x4 board cut to length
With the deck level and floated, finish with either a magnesium float or steel
trowel for a neat deck line level with the top of the support beams and top of
the pit.
When the entire frame has been floated with a magnesium float and has set
enough for finishing, use a radius edger to finish the metal/concrete joint.
For a non-skid surface, use a stiff bristle broom for a brushed finish when
the concrete has set enough for final finishing. It is recommended that a
non-skid surface be applied for all northern tier states.

10 Survivor® PT Pit-Type Truck Scale Assembly Instructions
Curing the Completed Concrete Deck
The concrete deck must be maintained in a moist state for at least seven days for a satisfactory cure. If the top
surface of the deck is allowed to dry during this time, the finished surface will be prone to unsightly spalling and
be weakened from surface cracking.
A moist surface can be maintained by covering the entire deck with a continuous 4 to 6 mil sheet of polyethylene
plastic turned up and dammed at the ends and kept filled with 1" of water. Alternately, an epoxy-based concrete
curing solution can be sprayed or rolled onto the deck surface immediately after final finishing and while the
concrete surface is still moist. As the epoxy curing solution will also seal in concrete stains on the exposed
support beams, clean off stains with a damp sponge before applying the curing solution to the deck. Epoxy-based
concrete curing products are available at contractor-supply companies. Do not use the petroleum-based or
paraffin-based waterproofing agents specifically advertised for wood decks and concrete patios. These products
are not curing agents, and will allow the deck surface to rapidly dry.
4.1 Optional Equipment
The following is a brief summary of the optional Survivor SR-PT equipment available from RLWS.
Eighteen Inch Main Beam Module
An 18" main beam module is available from RLWS as an option. Use of this option will require increasing the pit
pillar height approximately 6". Refer to the appropriate drawing for exact pit dimensions. This option should
only be used in states where there is a requirement for a minimum of 48" clearance below the main I-beam
flange. (Steel weight is increased approximately 1/3 when selecting this option.)

Install Cabling in Conduit 11
5.0 Install Cabling in Conduit
5.1 Load Cells to Junction Box
Figure 5-1. Load Cell Cable to Junction Box.
Each load cell is equipped with 60' of load cell cable, sufficient to reach a centrally-located junction box on
standard scales. A watertight conduit adapter and a 30" section of 3/4" flexible conduit is supplied for both ends
of each load cell cable located at the load cell and at the junction box. Main conduit runs between these 30"
flexible end sections are 3/4" galvanized metal conduit already installed on the deck as shown above.
NOTE: If using a single center module, some of the conduit runs are not used. These conduit runs are used when more than one
center module is installed.
5.2 Junction Box to Indicator
A 60' section of 6-wire homerun cable is supplied. It is
to be run in 3/4" galvanized metal conduit from the
junction box to the indicator. A 30" flexible conduit
section and watertight conduit connector is provided
where this cable exits the junction box. Galvanized
metal conduit must be obtained locally.
NOTE: Scales over 70 feet in length have two or three J
boxes. Refer to blueprint package provided with scale for
details.
5.3 Indicator to Peripherals
All 3/4" metal conduit for cabling from the indicator
to remote displays and other peripheral devices must
be obtained locally. Conduit runs may be buried in a
trench or secured above ground. Use separate conduit
runs for AC power and DC data lines to avoid
interference. As a general guideline, run AC and DC
cables in separate trenches if possible. When DC data
cables must run in the same trench as AC power lines,
separate cables as much as possible.
5.4 Single-Point Ground Conductor
A bare 10-gauge solid wire is run from the scale frame
to the grounding lug on the junction box, then
underground to the main AC power earth ground. If
the optional DC transient protection board is installed,
the ground conductor should also be connected to the
transient protection board’s ground lug. Consult with
your power utility for local restrictions or
requirements for utility ground rod connections.
5.5 Junction Box Connections
Each JB8SPT junction box is large enough to hold the
summing board, transient protection devices,
desiccant package, and extra load cell cable coiled
inside the enclosure.
In a single-platform scale, the single junction box
location is determined by the length of the load cell
cables and the four mounting studs on the outside
main beams. Both Aand Bmodules are equipped with
mounting studs. In a multi-axle scale with
independent sections, each section requires its own
junction box to sum the load cell signals from that
section.
Bottom View
Load Cells (8 locations) Junction Box
To Scale House
Conduit Runs (typical)

12 Survivor® PT Pit-Type Truck Scale Assembly Instructions
A summing card mounted within the junction box is used to make all cable terminal connections. All terminal
pin functions are clearly marked.
A 10-gauge bare ground wire is run from one of the junction box mounting studs to the ground lug of the junction
box as shown in the figure below. The ground lug on the bottom of the junction box is connected to a buried
ground cable from the AC power ground terminal or ground rod, thus grounding the scale frame to the same
single-point ground point as the AC power for the indicator.
Figure 5-2. J-Box Grounding.
Before final closure, add an industrial corrosion inhibitor and desiccant (RLWS Industrial Corrosion Inhibitor,
PN 16037) to the junction box enclosure. This desiccant protects an enclosure up to 5 ft3from internal corrosion
for approximately 1 year.
NOTE: Make sure that the 10 gauge ground wire makes connection to bare metal.
5.6 Electrical Ground Connections
Improper grounding systems on outdoor truck scales often cause corrupted data as a result from ground-loop
current flows. Improper grounding systems may also invite possible lightning strikes and cause damage to costly
electronic systems. Always attempt to establish a single-point grounding system.
When establishing a ground system for the scale installation, do not install more than one ground
rod for each scale location. Separate earth grounds do not share the same zero reference as the
existing earth ground for the AC power system. The difference in electrical potential invites
ground-loop current flow between the separate grounds, often corrupting serial data, such as RS-232, which
depends on a stable zero reference.
In addition, a separate earth ground system at the scale can actually invite lightning or power surge damage:
• A minor powerline surge in the scale house electrical supply should immediately be shunted to ground. If
a separate ground system exists at the scale with a lower potential than the main ground, the surge may
travel to the scale ground rod, damaging load cells on its way.
• A lightning ground strike may instantly raise the zero potential of a ground rod at the scale location while
leaving the scale house ground rod unaffected. A lightning surge takes the easiest path to the
lower-potential ground: through the scale wiring and back to the scale house ground, therefore possibly
damaging the indicator on its way.
Ground Lug
Located in
J-box Pocket
10 ga. bare ground wire to DC
protection ground before indicator

Install Cabling in Conduit 13
The best grounding system for the scale is the same grounding system used for the incoming AC power system.
The 120 VAC power source used to power the indicator is connected to an existing earth ground rod system at the
scale house or other building where the indicator is located. This consist of a double ground rod system of two 5/
8" x 8' copper rods driven 8' deep at the service entrance where the local utility company brings their lines into
the building. The local utility company can test the resistance of the existing ground rods with a clamp-on
megohmeter to measure resistance. A reading of 3¾ or less is acceptable as a ground. If the test determines that
the grounding system is inadequate, the utility company can suggest methods to improve the system. It is crucial
that the scale owner authorize and make the recommended improvements to assure an adequate electrical
ground. Do not connect the scale to the AC power supply until the grounding system is adequate.
Each load cell grounding strap is securely fastened to the top and bottom plates of each load cell mount. The
grounding strap is designed to channel power surges on the deck around—rather than through—the load cell to
ground. All ground connections must be properly torqued and rechecked at regular service intervals. After
connecting to bare metal apply a thick coating of anti-oxidant grease on all ground connections to prevent
corrosion.
A separate grounding system conductor must extend uninterrupted from the main service panel ground to the
scale to protect load cells and scale wiring from lightning and other transient damage. As a minimum
requirement for ground wire installation, the conductor must be at least a 10-gauge unsheathed copper wire. Run
the bare ground wire conductor intact from the AC power ground rod to the scale in a separate trench. Bring the
wire up from the trench near the junction box and attach it to the ground lug of the junction box. Use a short piece
of 10-gauge wire to ground the scale frame by running a ground wire from the junction box ground lug to a
junction box mounting bolt on the scale frame.
5.7 Install Transient Protection
An two-year lightning protection package comes standard on all SURVIVOR®PT Pit-Type truck scales. This
package is designed to protect the AC and DC portions of the system. The package includes:
• A DC transient protection board mounted within the junction box. This DC transient protector can
accommodate up to eight load cells and will help protect serial communication lines. Scales with more
than eight load cells require a DC transient protection board in each junction box.
• A self-contained DC transient protection unit in the homerun cable at the indicator.
• A 10-gauge bare ground conductor cable. This conductor cable, to be buried underground, runs from the
scale frame to the junction box DC transient board, to the indicator DC transient board, and finally to the
AC power ground lug.
• A 120 VAC uninterruptable power supply/surge protector in the AC line before the indicator.
NOTE: Transient protection for additional peripheral devices (except some boards) is not included in the standard transient
protection package. Call the Rice Lake Weighing Systems Sales Department at [phone] for additional transient protection
for these devices.

14 Survivor® PT Pit-Type Truck Scale Assembly Instructions
Figure 5-3. Single-Point Grounding Diagram.
AC Power
Supply
#10 Copper
Ground Wire
Serial
Communication
Homerun
Cable
Load Cell
Cable
UJB-3T6
DC Transient Protection
RLWS PN 21134
TP-232
DC Transient Protection
RLWS PN 33185
TP-232
DC Transient Protection
RLWS PN 33185
SOLA S2K
AC Transient Protection
RLWS PN 80928
AC Outlet
SOLA S2K
AC Transient Protection
RLWS PN 80928
AC Outlet
Power Company Ground Rod
*Always verify that installed wiring is properly grounded
JB8SPT
Junction Box
With Transient Protection
RLWS PN 91783
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#
RICELAKE WEIGHING SYSTEMS
JP
-EX
+EX
+SI
-EX
+EX
+SI
-EX
+EX
+SI
-EX
+EX
+SI
SIGNAL
TRIM
TRIM
TRIM
TRIM
TRIM
TRIM
Assembly
-EX
-EX
+EX
+SI
SHD
1
SHD
-SI
1
-SI
1
-SI
SHD
1
-SI
SHD
CONNECTBOTHSHUNTS
TOAPPLY SIGNAL
SECT#
SIGNAL SIGNAL SIGNAL
CELL#
PNRev.
+SI
-SI
-SI
SECT#
+SEN
SHD
+SEN
SHD
DISCONNECTBOTHSHUNTS
TOREMOVE SIGNAL
+EX
-SEN
-SEN
CUTTRACETO ISOLATESENSE LINE
TransientBoard Connectors
GroundingLug

Trimming and Calibration 15
6.0 Trimming and Calibration
6.1 Overview and Equipment Required
Load Cell Trimming
Individual load cell signal trimming (equalizing the signal output from each load cell) must be done first along
each side of the scale so all cells on a side have equal signal output. Adjustments are somewhat interactive, so
each side should be done at least twice.
Once that is done, load cell pairs—one from each side—are trimmed as paired sections until each sectional
output is equal. Adjustments to each section should also be done at least twice.
Figure 6-1. Load Cell Trimming Diagram.
Equipment Required
Both of these trimming operations can be done using
only a weight cart parked in various locations on the
scale. Final verification of equal output trimming,
however, will require test weights to be placed on the
deck in various locations.
6.2 Trimming Individual Cells
1. Connect all load cells to the summing board
terminals in the junction box.
2. Connect the main interface cable from the
junction box to the indicator.
3. Power up the indicator.
4. Turn all load cell potentiometers (individual
and section) in the junction box clockwise
until a clicking noise is heard when you
continue turning. This eliminates any initial
resistance so all signals are at full strength.
You’re now ready to do individual signal
trimming.
Side 1
The first objective is to adjust individual load cells
along one side of the scale for equal signal output
when equal weight is put on those cells. For
convenience, that side of the scale will be referred to
as Side 1. The trimming weight you will use will be
the loaded weight cart.
1. Park the cart as close as possible to Side 1
being trimmed with the wheels centered over
the end load cell mount (No. 1 in drawing to
below). Record the indicator reading.
Remember that the scale is still uncalibrated,
so the indicator readings are simply raw
counts rather than weight units.
Figure 6-2. Trimming Load Cell Number One.
2. Move the cart directly over mount No. 2 and
record that reading. Move the cart directly
over mount No. 3 and record that reading.
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1st – Trim Side 1 Cells (1, 2, 3, 4)
2nd – Trim Side 2 Cells (5, 6, 7, 8)
3rd – Trim Sections
(1, 8; 2, 7; 3, 6; 4, 5)
Weight
Cart
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2
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16 Survivor® PT Pit-Type Truck Scale Assembly Instructions
Move the cart so the wheels are centered
directly over mount No. 4 (you may have to
turn the weight cart around so all wheels
remain on the scale) and record the reading.
Figure 6-3. Trimming Load Cell Numbers 2, 3, and 4.
3. The lowest reading of the four will be your
reference cell. You won’t change that cell’s
signal. Instead you’ll use the individual cell
potentiometers for the other three cells to
reduce those signals to match your reference
cell. Remember that you turned all pots to full
signal (0 resistance) before starting. So you
can’t increase the signal from any cell—you
can only decrease signal by trimming with the
pots.
4. Note that the best trim is always the least trim.
If one of the four readings differs from the
others by more than 5% of the displayed
counts, there is probably a mechanical
problem with that load cell mount causing the
large difference. Find it and correct it before
going on. Check for binding, an out-of-level
or misaligned link, or similar problems with
the load cell and mount. Do not try to trim
down large signal differences with resistance
pots—you’ll only add larger problems for
yourself later because of interaction between
mounts.
5. Park the loaded weight cart over one of the
high-reading cells on Side 1. Turn that cell’s
individual potentiometer until the displayed
reading equals your recorded reference cell
reading. Repeat for the other two high-reading
cells on side 1.
6. As adjustments are somewhat interactive,
repeat the process in Steps 1 through 5 until
all four cells on Side 1 read within 1% of each
other.
7. Side 2. Move to the Side 2 of the scale. Load
each cell in turn with the weight cart and
record readings on those four cells in the same
way. The cell which reads the closest to
the Side 1 reference cell will be used as
your reference cell for trimming the other
cells on side 2.
Figure 6-4. Trimming Load Cell Number Five.
NOTE: The reference cell on Side 2 should be the same as the
Side 1 readings. Move the weight cart over the cell chosen for
the Side 2 reference cell. Adjust the cell’s individual pot to
equal the final Side 1 readings. In the example at left, Cell 8
has been chosen as the Side 2 reference cell.
8. Reload the other Side 2 cells (5, 6, 7 in the
example) in turn with the weight cart and
adjust their individual pots so their readings
are equal to the Side 2 reference cell (8 in the
example).
Figure 6-5. Trimming Load Cell Number Eight.
9. Repeat Steps 7 through 9 if needed to get all
Side 2 cells reading within 1% of each other
and within 1% of the Side 1 reference cell.
6.3 Trimming Paired Sections
Now that you’ve trimmed all individual load cells for
equal output, pairs of load cells on opposite sides of
the scale must be trimmed for equal sectional output.
This process is called section signal trimming.
1. Park the loaded weight cart in the middle of
the scale and directly over an imaginary line
connecting an end pair of cells (1 and 8 in the
example at right). Record the indicator
reading.
Figure 6-6. Trimming Paired Section 1:8.
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2
85 6
7
143
2
85 6
6
143
2
85 6
7
143
2
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