RICE LAKE WEIGHING SYSTEMS JB1010ST Ten-Channel Signal Trim Junction Box Instruction Manual

Ten-Channel Signal Trim Junction Box
JB1010ST Installation Instructions

JB1010ST Ten-Channel Signal Trim Junction Box

The JB1010ST Junction Box accommodates two, four, six, eight or ten load cells with transient protection components. Load cell output can be trimmed with potentiometers either individually or in pairs by section.

Mount the Enclosure

Mount the enclosure in a location convenient for servicing and away from standing water. Ensure load cell cables reach enclosure without extensions. Attach enclosure to mounting surface with four suitable fasteners.

Wire Junction Box

1. Route the load cell cables through the nylon cord grip assemblies and leave the grips loose.
2. Check all wire ends are properly stripped and tinned.
3. Twist the woven shield of each cable into a single “wire” and attach it to the cell terminal strip shield pin.
4. Connect load cells to terminal strips “Cell 1” through “Cell 10”.
   NOTE: Disable unused channels by cutting corresponding isolation resistors.
   IMPORTANT: The JB1010ST only functions with an even number of load cells. Both Channels must be used in each section.

juction box to multiple junction boxes.
CELL| Load Cells| See the load cell wiring guide at www.ricelake.com for wiring colors. Two cells must be connected to
each section.
INDICATOR| Indicator or J-Box EXPANSION terminal| Determine load cell input connections from indicator technical manual. Run a cable from INDICATOR
terminal into junction box through the larger cord grip. To connect multiple junction boxes together wire
secondary juction box INDICATOR terminal to primary junction box Expansion terminal.

Table 1. Terminal Blocks

**NOTE:** Use sense leads to compensate for temperature changes, especially if the indicator is far from the juction box.

Trim Junction Box

Ensure isolation resistors corresponding to any unused terminals are cut to disable use of these channels.

1. Turn all potentiometers fully counter-clockwise to give maximum signal output from each cell.

2. Zero the indicator.

3. Place a calibrated test weight equal aproximatly 25% of scale capacity centered over each load cell (or over each section) and record the value each time the weight is placed on the scale.

4. Record the load cell or section with the lowest value as the reference value. This cell or section will not be trimmed.

5. Place test load over each cell or section and trim corresponding potentiometer until indicator matches reference value.

6. Check all cells or sections again for repeatability.

7. Repeat Steps 3 through 6 until the weight display at all cells or sections match.
   NOTE: If a substantial amount of trim is necessary to equalize values, check for friction or other mechanical problems.
   Allow the indicator to return to zero after each weighment.

8. Perform standard calibration.

Seal Junction Box

1. Tighten all wiring connections.
2. Pull excess cable out of enclosure and torque cord grips. Plug all unused cord grips with post screw plugs (PN 19568).
3. Insert a commercial desiccant packet into the junction box.
4. Replace the cover and tighten the cover screws in an alternating pattern.

IMPORTANT: If cables are exposed to water or other liquids, bend a short downward loop in all cables outside of the junction box, near the cord grips to create a drip point that sheds water away from the cord grip. If enclosure is in a damp or wet area, change desiccant every four to six months.
Apply the following torque during installation and the hardware replacement to ensure IP ratings are maintained.

Table 2. Torque Values

© Rice Lake Weighing Systems Content
subject to change without notice.
230 W. Coleman St.
• Rice Lake, WI 54868
• USA USA: 800-472-6703
• International: +1-715-234-9171
www.ricelake.com
PN 68812 Rev B

References

• Rice Lake Weighing Systems

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