Rice Lake JB1010ST Signal Trim - Manual (Page 2)

Introduction
The JB1010ST Junction Box can accommodate two, four, six, eight, or
ten load cells with transient protection components. This board cannot
be used with an odd number of cells. Any unused channels require
modification. Load cell output can be trimmed with potentiometers
either individually or in pairs.
When correctly installed, the NEMA 4X stainless steel enclosure will
withstand 40 psi water pressure. It is not, however, designed for high-
pressure washdown applications, exposure to steam, or exposure to
high-temperature liquids.
Mounting the Junction Box Enclosure
Mount the enclosure in a location convenient for servicing and away
from standing water. Try to mount the enclosure in a location that will
not require extending the load cell cables. Depending on the mounting
surface, the enclosure is attached using the four suitable fasteners.
Figure 1 below shows dimensions for mounting the enclosure.
FIGURE 1. ENCLOSURE DIMENSIONS
© 2003 Rice Lake Weighing Systems, Inc., Rice Lake, WI USA. All Rights Reserved
Rice Lake Weighing Systems, Inc. 230 West Coleman Street, Rice Lake, WI 54868
Wiring
The terminal strips are labeled “Cell 1” through “Cell 10” and are used
to connect the individual load cells. Determine the number of load cells
to be connected to the junction box. The JB1010ST has been designed
to connect and trim two, four, six, eight, or ten load cells only. Load cell
output can be trimmed with potentiometers individually, or paired
channels may be trimmed as a section. If using the paired-channel
section trim, there must be two load cells attached to each section.
After determining the wiring pattern, route the load cell cables through
the nylon cord grip assemblies and leave the grips loose until final
closure. Before connecting load cell cables to the terminals, check that
all wire ends have been properly stripped and tinned.
Determine the color coding of the load cells used and connect each load
cell cable to its terminal according to the labels by the terminals. For
each cable, twist the woven shield into a single “wire” and attach it to
the shield pin on its terminal strip.
Disable any unused channels by cutting
the isolation resistors corresponding to those channels.
The INDICATOR terminal strip is for connecting the main cable to the
indicator. Determine the indicator’s load cell input connections from
the operating manual. Run a cable from your indicator terminal into the
junction box through the larger cord grip and make the connections on
the INDICATOR terminal.
WIRING PATTERN
See back cover of Rice
Lake Weighing Systems
Load Cell Guide for wiring
color codes.
2
CAUTION: Do not attempt
to use an odd number of
load cells with the
JB1010ST.
You must use
both channels for each
section.
LOAD CELL
SENSE LEADS
Use sense leads to
compensate for temperature
changes, especially if the
indicator is located far from
the junction box.
FIGURE 2: MAIN BOARD
January 2003
DO NOT USE WITH AN ODD NUMBER OF LOAD CELLS
Turn pot’s CW for maximum output
INDICATOR
SECTION 1 SECTION 2 SECTION 3 SECTION 4 SECTION 5
CELL #1 CELL #2 CELL #3 CELL #4 CELL #5 CELL #6 CELL #7 CELL #8 CELL #9 CELL #10
SECTION 1 TRIM SECTION 2 TRIM SECTION 3 TRIM SECTION 4 TRIM SECTION 5 TRIM
MULTIPLE LOAD CELL TRIMMING BOARD - MODEL UJB-10LCT - REV. B
GT1
GT2
GT3
GT4
GT5
CELL
#1
CELL
#2
CELL
#3
CELL
#4
CELL
#5
CELL
#6
CELL
#7
CELL
#8
CELL
#9
CELL
#10
REMOVE ISOLATION
RESISTORS TO
DISABLE UNUSED
CHANNELS
SHIELD
-EX
+EX
-SIG
+SIG 5
4
3
2
1
6
7
+SEN
-SEN
8 EARTH
SHIELD
-EX
+EX
-SIG
+SIG
SHIELD
-EX
+EX
-SIG
+SIG
5
4
3
2
1
5
4
3
2
1
SHIELD
-EX
+EX
-SIG
+SIG
SHIELD
-EX
+EX
-SIG
+SIG
5
4
3
2
1
5
4
3
2
1
SHIELD
-EX
+EX
-SIG
+SIG
SHIELD
-EX
+EX
-SIG
+SIG
5
4
3
2
1
5
4
3
2
1
SHIELD
-EX
+EX
-SIG
+SIG
SHIELD
-EX
+EX
-SIG
+SIG
5
4
3
2
1
5
4
3
2
1
SHIELD
-EX
+EX
-SIG
+SIG
SHIELD
-EX
+EX
-SIG
+SIG
5
4
3
2
1
5
4
3
2
1
9.19"
(233.4mm)
8.58"
(217.9mm)
8.06"
(204.7mm)
0.44"
(11.1mm)
5.19"
(131.8mm)
5.94"
(150.8mm)
2.06"
(52.3mm)
7.94"
(201.6mm)
Technical training seminars are available through Rice Lake Weighing Systems.
Course descriptions and dates can be viewed at www.rlws.com or obtained by calling
715-234-9171 and asking for the training department.