Avery Weigh-Tronix BridgePort User manual

1
Introduction
Please refer to the general
installation drawing for installa-
tion details.
Recommended equipment list:
• Wrench set
• Socket set
• Tape measure
• Chalkline
Figure 1
Scale modules
BridgePort Installation Guide
The Weigh-Tronix BridgePort vehicle scale is an electronic, low profile, self-
contained, portable scale suited for a wide variety of applications.
It is designed and manufactured for simplified, temporary installation and
relocation when necessary.
The basic units are available in lengths of 20, 25, 30 and 35 feet. Each
module has its own frame, four 50,000 lbs weigh bars, and a junction box.
For a longer scale, simply join 2 or more modules together. Refer to Figure
1. The BridgePort has a CLC capacity of 40 ton and a weighing capacity up
to 100 ton.

2
The BridgePort scale may be installed on a pier made of bridge planks,
concrete footers, swamp pads, or other suitable surfaces. The pier should
extend the width of the scale. The owner is responsible for soil stability
conditions of at least 3,000 Ib/sq. ft. The pier shown on the drawing is
nominal and based on a soil bearing capacity of 3,000 Ib/sq. ft. If soil
conditions will not sustain this load, increase the pier size accordingly.
If the scale is to be used during winter season, the piers must descend a
minimum of 6" below the frost line.
To speed the installation of the scale, ensure the proper installation of the
piers before receiving the scale.
For the dimension information, refer to the installation drawing.
The top of the piers must be level and on the same plane within 1/8".
One 5/8" x 8' copper or zinc plated ground rod must be installed for each
end of the scale and for each joint between modules. The ground rod must
be driven down to the water table. If eight feet is not enough, use a longer
rod.
Lower the scale module on the foundation using the lifting lugs in the bridge.
Refer to Figure 2.
Single Module
Installation
Installation
Figure 2
Lifting lug locations
Never use the frame or guide
rails to lift the scale module

3
Make sure all corner base plates are fully and rigidly supported. If neces-
sary, use metal shims to ensure a good, level support.
Loosen all check bolts - 4 per module
Remove the nuts from the hold down bolts; lower the bolts; then, replace the
nuts on the bolts, so they remain on the holding block on the frame.
Adjust the check bolts to a maximum of 3/16" clearance. Refer to Figure 3.
Figure 3
Checkbolts
Install the optional bulkheads on each end of the scale.
If the bulkheads are from Weigh-Tronix, use (4) 3/4 - 10 x 2 1/2" bolts, bevel
washers, and nuts supplied by Weigh-Tronix. Refer to Figure 4.
If other than Weigh-Tronix bulkheads are used, ensure the proper clearance
between the scale platform and the bulkhead. Weigh-Tronix will not be
responsible for error caused by other bulkheads.

4
Once the bulkheads are properly installed, prepare the ramps at each end of
the scale. The ramps must be straight and level, for a minimum of 10 feet at
each end of the scale.
The ground rods must be installed as close as possible to the scale module
at each end and same side as the junction box. Connect the ground rod to
the scale module frame using the supplied ground strap. Refer to Figure 5.
Figure 4
Optional bulkhead attachment

5
To connect the indicator to the scale using the home run cable, remove the
protective cap from the bottom connector on the junction box. Apply noncon-
ductive silicone grease inside the protective cap and if needed, also on the
cable connector, before connecting. Refer to Figure 6.
Figure 5
Grounding details
Install the T-gap covers, (optional), at each end of the scale to cover the gap
between the edge of the scale deck and the bulkhead.
The scale is now ready for testing, calibration, and inspection (as required).
Figure 6
Interconnecting details
For best grounding we
recommend one grounding
rod for each end of a scale,
one grounding rod for each
junction of scale decks, and
a separate ground for the
power source in accordance
with NEC Code 250. When
possible, this power source
ground should also be tied
to the scale grounds.

6
Lower the module as described in
Single-Module Installation .
Remove the tie down bolts on each unit. (4 at each end) Refer to Figure 7.
Figure 7
Multi-module installation
Position each module end to end. Make sure the junction boxes remain on
the same side of the scale.
To ensure the proper positioning of the second and third module (if appli-
cable), the units must be as close as possible together on the same plane
and the holes in the frame must line up straight. Refer to Figure 8.
Multi-Module Installation
Figure 8
Connecting modules

7
Make sure the corner of the frames are fully and rigidly supported. If neces-
sary, use metal shims to ensure a good, level support.
Once the modules are properly installed, use the connector bolts, bevel
washers, and nuts to firmly attach each module together. Refer to Figure 8.
Loosen all check bolts - 4 per module
Remove the nuts from the hold down bolts; lower the bolts; then, replace the
nuts on the bolts, so they remain on the holding block on the frame.
Adjust the check bolts to a maximum of 3/16" clearance. Refer to Figure 3.
Install the optional bulkheads on each end of the scale.
If the bulkheads are from Weigh-Tronix, use (4) 3/4 - 10 x 2 1/2" bolts, bevel
washers, and nuts supplied by Weigh-Tronix. Refer to Figure 4.
If other than Weigh-Tronix bulkheads are used, ensure the proper clearance
between the scale platform and the bulkhead. Weigh-Tronix will not be
responsible for error caused by other bulkheads.
Once the bulkheads are properly installed, prepare the ramps at each end of
the scale. The ramps must be straight and level, for a minimum of 10 feet at
each end of the scale.
The ground rod must be installed as close as possible to the scale module
at the opposite end and same side as the junction box. Connect the ground
rod to the scale module frame using the supplied ground strap. Refer to
Figure 5. One ground rod should be installed for each end of a scale plus
one ground rod for each junction between modules.
Use the interconnecting cables to connect the modules together and to
connect the scale to the indicator. Leave the protective cover on the unused
connector. Apply nonconductive grease inside the removed protective caps
and if needed, apply nonconductive silicone grease on the cable before
connecting it to the box. Refer to Figure 9 for 2 module installations and
Figure 10 for 3 module installations.
Figure 9
Dual module wiring

8
Install T-gap covers over the gap left between each module.
Install T-gap covers to cover the gap between the scale deck and the
bulkhead.
The scale is now ready for testing, calibration, and inspection (if applicable).
Remove all the T-gap covers.
Disconnect all the cables and the ground connectors. Store them in a safe
place for future use.
Apply nonconductive silicone grease on connectors and install the protective
covers on the summing box connectors.
Remove the tie down bolts and store them in a safe place for future use.
Install the hold down bolts to secure the scale weigh bridge to the frame.
To prevent movement of the scale platform, tighten the bumper bolts.
Remove the approaches.
Remove the bulkheads. (if applicable)
If the corner frame on the scale has been anchored (optional), ensure the
removal of these anchors before trying to lift the scale.
Ensure that the scale frame is not jammed in ice or heavy mud.
Use the lifting lugs to lift each module.
Never use the frame to lift the scale module
Figure 10
Triple module wiring
Preparing The Scale Module For Relocation

9
If the scale has been installed between concrete approach slabs, the
customer may anchor the module using the existing holes in the corner base
plates for 1" anchor bolts. RED HEAD and WEJ-IT are two brand names of
expansion anchor bolts but neither are endorsed by Weigh-Tronix, Inc.
Properly install the scale module on an adequate foundation.
Drill a 1" hole, a minimum of 7" deep, in concrete and anchor the scale
module using adequate chemical or epoxy held anchors.
Part Part Number
S.S.Junction box C138736
Weigh bar 15' std. cable 271 73-0046
Weigh bar 50' std. cable 271 73-0053
Weigh bar 15' S.S. sheathed cable 27173-0061
Weigh bar 50' S.S. sheathed cable 27173-0079
50' home run std. cable
(1) 7 pin male connector 47662-0034
(2) 7 pin male connectors 13644-0021
50' home run S.S. sheathed cable
(1) 7 pin male connector 52245-0014
(2) 7 pin male connectors 52246-0013
Link 271 71-0014
Pin 26753-0012
24" ground strap 1C00739
40" ground strap 1C01632
Ground strap connector
Protective, nonconductive silicone grease
Electrical Insulating Compound DC4 1C01642
Installation On Concrete Pads With Concrete Approaches
Spare Parts List
Equipement List:
• Rotary hammer drill
• 24” driver pipe for anchor
bolts
• 24” x 2” masonary bit for
anchor bolts

10
For proper weight reading, the signals reaching the indicator must be
identical no matter where a weight is placed on the scale. Getting these
signals to match is called corner balancing the scale.
Your goal is to get the readings from the weight sensors to match. You do
not have to get the correct weight reading at this point. That is taken care of
when you calibrate your indicator. (See the Service Manual for your indica-
tor.) One potentiometer affects one weight sensor. You balance the weight
sensors by adjusting the corresponding potentiometer in the junction box.
This scale was corner balanced at the factory, but in a new installation it is
required that corner balancing and calibration be checked to ensure installa-
tion accuracy. Below are the steps you need to take to corner balance your
scale:
1a. Test load the deck in both directions by driving a loaded truck on and off
the scale 3 or 4 times.
1b. Check all mechanical hardware.
1c. Remove the junction box cover to access the potentiometers.
2. To capture the value of internal zero for your particular indicator, refer to
your indicator's Service Manual .
3. Use test weights equal to 20-25% of full capacity and obtain a displayed
weight value for the test weight applied to each of the four weight
sensors, like this:
3a. Disable AZT on indicator.
3b. Place certified test weight directly above first weight sensor.
3c. Record displayed weight value.
3d. Repeat steps 3b and 3c for each weight sensor.
4. If displayed weight values for all weight sensors equal each other, within
+/- 1 division, proceed to the calibration instructions for your indicator
found in
5. If displayed weight value for any weight sensor varies from the others by
more than +/- 1 division, adjust the appropriate junction box potentiom-
eter by turning it the number of 360 degree turns indicated by this
formula:
If the Number Of Turns is a positive value, turn the potentiometer
clockwise. If Number Of Turns is a negative value, turn the potentiom-
eter counterclockwise.
6. Repeat steps 3b and 3c followed by step 4 or step 5 until all weight
sensors equal each other, within +/- 1 division.
Corner Balancing

Weigh Bar®is a registered trademark of Weigh-Tronix Inc.
02/23/00 BPORT.P65 PN 29744-0018e1 Printed in USA
Weigh-Tronix
1000 Armstrong Dr.
Fairmont, MN 56031 USA
Telephone: [phone]
Facsimile: 507-238-4195
e-mail: [email protected]
www.weigh-tronix.com
Weigh-Tronix Canada, ULC
217 Brunswick Blvd.
Pointe Claire, QC H9R 4R7 Canada
Telephone: [phone]
Facsimile: 514-695-6820
Weighing Products & Systems