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WT-3600
TON CONTAINER
WEIGH TRUNNION
OPERATION INSTALLATION AND SERVICE MANUAL
366 CIRCLE OF PROGRESS POTTSTOWN, PA 19464
(610)323-2250 FAX: (610)323-0114
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TABLE OF CONTENTS
CONTENTS
SECTION1 . 0 DESCRIPTION.
SECTION2 . 0 PREPARATION FOR USE
2.1 RECEIVING INSPECTION
2.2 SHIPMENT
2.3 SITE SELECTION
2.4 INSTALLATION
2.5 CONNECTION TO DISPLAY/TRANSMITTER
SECTION3 . 0 TROUBLE SHOOTING
SECTION4 . 0 SERVICING
4.1 CHECKING THE SUMMING BOX CONNECTIONS
4.2 CHECKING FOR TRUNNION DAMAGE/INTERFERENCE
4.3 CHECKING THE LOAD CELL
SECTION5 . 0 SPECIFICATIONS
SECTION6 . 0 SPARE PARTS LIST
LIST OF ILLUSTRATIONS
FIGURE 1: Anchor Bolt Spacing
FIGURE 2: System Wiring
FIGURE 2a: Wiring Color Code
FIGURE 3 : Summing Junction Board
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SECTION 1.0 DESCRIPTION
EAGLE MICROSYSTEMS WT3600 Weigh Trunnion was designed specifically for weighing standard t on
containers for Chlorine and Sodium Dioxide. Rollers made of UHMW plastic on stainless steel axles allow
easy ton rotation and require no greasing or other preventive maintenance. Two sealed stainless steel,
electronic load cells provide an accurate weight reading. Each WT3600 weighs less than 50 pounds so it
is shipped via parcel service and can be handled and installed by one person. Several WT3600’s can be
daisy chained to create a multiple container scale. This modularity allows easy reconfiguration to
accommodate growth or downsizing without waste of resources.
SECTION 2.0 PREPARATION FOR USE
2.1 RECEIVING INSPECTION
1. Upon receiving the WT3600, carefully inspect the condition of the shipping container including
the banding and any protective covering used for shipping. Report any damage to the shipper and to
Eagle Microsystems.
2. Remove the WT3600 from the box and inspect for damage. Report any damage to the shipper
and to Eagle Microsystems.
2.2 SHIPMENT
Should re-shipment of your WT3600 become necessary.
1. Use a strong, well-built shipping container. The shipping container must be larger than the outer
dimensions of the WT3600 to protect it in shipping.
2. Make sure the hook-up cable is protected and secured in crate.
3. Use strong banding to secure WT3600 in shipment.
2.3 SITE SELECTION
1. Line power devices causing large inductive currents should not run off the same circuit as
the weigh system. Fluctuations in line voltage caused by such devices may result in display instability.
2. The hook-up cable to the read-out should not run close to other unshielded cables. Display
instability may result.
3. For best accuracy, a flat, level, and rigid surface is recommended to support the WT3600.
4. The area should be accessible for periodic cleaning.
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2.4 INSTALLATION
1. The WT3600 is “rolled up” prior to packaging and shipment. Prior to installation, the scale assembly
must be “unrolled” so that the flexible conduit is straight on either side of the junction box. Rollers
should face upward.
57"
19"
17"
19"
FIGURE 1: Anchor Bolt Spacing
2. Figure 1. shows the mounting pattern for four 7/16” diameter mounting studs (by others) as well as
the minimum spacing between weigh trunnions for multiple trunnion applications.
3. Mounting tab on the base of each trunnion assembly is 3/4” high. 7/16” mounting studs should
extend no more than 1 3/8” above the floor.
4. For good scale performance and easy roller operation, care should be taken to ensure that
the two ends of the WT3600 are parallel, concentric and level with each other. If
necessary, use grout to achieve this.
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2.5 CONNECTION TO DISPLAY/TRANSMITTER
Refer to FIGURE 2 and 2a. Several configurations are possible. Note that the “Channel 2 Input” option
allows the cables for two scales or “banks” of scales to share a single conduit back to a dual channel
instrument. This option must be specified when ordering.
TO
DISPLAY
+E+S-S-E +E+S-S-E
+EXCIT.
+SIGNAL
-SIGNAL
+EXCIT
SHIELD
CHAN#1 OUT
SUMMING
INPUT
CHAN#2 OUT
CHANNEL
#2 INPUT
WT #1
+E+S-S-E +E+S-S-E
+EXCIT.
+SIGNAL
-SIGNAL
+EXCIT
SHIELD
CHAN#1 OUT
SUMMING
INPUT
CHAN#2 OUT
CHANNEL
#2 INPUT
WT #2
SINGLE CYLINDER OR SUMMED
BANK OF CYLINDERS
FIGURE 2: System Wiring
+E+S-S-E +E+S-S-E
CHAN#2 OUT
CHANNEL
#2 INPUT
+EXCIT.
+SIGNAL
-SIGNAL
+EXCIT
SHIELD
WT #1-1
+E+S-S-E +E+S-S-E
CHAN#2 OUT
CHANNEL
#2 INPUT
+EXCIT.
+SIGNAL
-SIGNAL
+EXCIT
SHIELD
WT #1-2
BANK #1
CHAN#1 OUT
CHAN#1 OUT
SUMMING
INPUT
SUMMING
INPUT
TO
DISPLAY
+E+S-S-E +E+S-S-E
CHAN#2 OUT
CHANNEL
#2 INPUT
WT #2-1
+E+S-S-E +E+S-S-E
CHAN#2 OUT
CHANNEL
#2 INPUT
WT #2-2
BANK #2
+EXCIT.
+SIGNAL
-SIGNAL
+EXCIT
SHIELD
+EXCIT.
+SIGNAL
-SIGNAL
+EXCIT
SHIELD
TO
DISPLAY
CHAN#1 OUT
CHAN#1 OUT
SUMMING
INPUT
SUMMING
INPUT
TWO SEPARATELY WEIGHED CYLINDERS
OR SEPARATE BANKS OF CYLINDERS.
OPTION ALLOWS TWO CHANNELS TO SHARE A SINGLE CONDUIT.
COLOR FUNCTION
RED +Excitation
GREEN +Signal
WHITE - Signal
BLACK - Excitation
YELLOW Shield
FIGURE 2a : Wiring Color Code
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SECTION 3.0 TROUBLE SHOOTING
The following is a list of potential problems and likely cures.
1. Inaccurate but repeatable weight readings:
a. Recalibrate the system (see instrument manual)
2. Inaccurate, non-repeatable weight readings.
3. Check the WT3600 trunnions for damage or interference (Sect. 4.2).
4. Check for bad load cell (Sect. 4.3).
5. Blank or drifting display:
a. Consult the instrument manual.
b. Look for loose connection in hook-up cable at the instrument or in the Summing Box(Sect.
4.1).
c. Look for moisture in the Summing Box (Sect. 4.1).
6. Check for bad load cell ( Sect. 4.3).
SECTION 4.0 SERVICING
4.1 CHECKING THE SUMMING BOX CONNECTIONS.
1. Locate the Summing Junction Box between the two trunnions and remove the lid.
2. Gently lift the summing board out of the box. Check for any signs of moisture or corrosion.
3. Check all connections by lightly pulling on each lead. Tighten terminal connections as
needed.
4. If problem persists, press lightly on the circuit board itself and check meter response.
Replace board if required.
Note: Make sure, when replacing the cover, that the box is dry and the cover is tight.
+E+S-S-E +E+S-S-E
CHAN#2 OUT
CHANNEL
#2 INPUT
+EXCIT.
+SIGNAL
-SIGNAL
+EXCIT
SHIELD
TOP
CHAN#1 OUT
SUMMING
INPUT
+E
+S
-S
-E
LOAD CELL #1 LOAD CELL #2
WTSJB4
BOTTOM
+E
+S
-S
-E
FIGURE 3: Summing Junction Board
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4.2 CHECKING FOR TRUNNION DAMAGE / INTERFERENCE.
1. Remove the ton container.
2. The 2 trunnions that support the ton container are hinged at the end where the pipe enters. Lift the
top casting at the opposite end to expose the load cell. The load cell has a small button that faces up.
This contacts a shock pad that is installed in the top casting directly above the load cell. This pad
consists of a metal plate attached to a rubber backing that is glued or taped in place. Check to be sure
that neither the plate nor the entire pad has fallen out on both trunnions. The pad and plate can be
glued back together and put in place with contact cement or double sided tape if they have come
apart.
3. Check for any objects that may have gotten stuck between the top and bottom castings.
4. Lower the top casting. It should not rub against the sides of the bottom casting or anything else as it is
lowered. If grouting was used when the scale was installed check that it is not under or against the top
casting.
CHECKING THE LOAD CELLS.
1. Disconnect the scale cable at the display instrument.
2. Measure the resistance between the green and white wires. This should be approximately 1502
ohms.
3. Measure the resistance between the black and red wires. This should be approximately 600 ohms.
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SECTION 5.0 SPECIFICATIONS
CONSTRUCTION: Load Cell: Stainless Steel
Trunnion Castings: Aluminum
Axles & Hardware: Stainless Steel
Rollers: UHMW Plastic
Shock Pads: Fabcel 300 ®
Conduit & Fittings: PVC
Junction Box: Cast Iron
FINISH: Trunnion Castings: Acrylic Paint
Junction Box: Clear Acrylic Paint
CAPACITY: 4000 Lb
SAFE OVERLOAD: 200% of Rated Capacity.
ULTIMATE OVERLOAD: 300% of Rated Capacity.
NOMINAL OUTPUT: 0.5 mV/V at full scale
EXCITATION VOLTAGE: 5 to 15 VDC
OPERATING ACCURACY: 0.5% of Capacity.
REPEATABILITY: 0.2% of Capacity.
LOAD CELL: Stainless Steel strain gage, hermetically sealed,1000 Ω.
TEMPERATURE: 0 to 150 Degr. F.
HOOK-UP CABLE: 15' of 4 conductor, color coded,shielded cable. PVC jacket.
SECTION 6.0 SPARE PARTS LIST
PART DESCRIPTION MODEL/CAPACITY
Load Cell TH-CM / 4,000 lbs F.S.
Roller M10246
Roller Retaining Ring WST-75
Shock Plate M10250
Shock Pad M10249
Shock Disk M10131
Load cell Summing Board WTSJB
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