Mettler Toledo IND131 Installationshandbuch Seite 44

IND131/IND331 Terminals Installation Manual
+Excitation and +Sense terminals and between the −Excitation and −Sense
terminals.
Junction-Box Enclosures
In this version, from two to four individual load cell cables enter the enclosure and
are terminated to a summing board. An internal harness then connects from the
summing board to the load cell input of the IND131 terminal. To facilitate
installation, the summing board is mounted to a removable mounting bracket so
that it can be removed from the side of the enclosure. This allows direct access to
the load cell termination terminal blocks on the summing board. These terminal
blocks are NOT removable.
To provide better access to the summing board for wiring, cut the nylon wire tie
that secures the ferrite core of the internal harness to the back of the enclosure –
the wire tie anchor is indicated in Figure 2-36. Unplug the harness from the
IND131 terminal.
Remove the IND131 terminal by pulling it up vertically and sliding it off the end of
the DIN rail. This provides better access to the summing board terminal blocks.
The holes in the summing board bracket are slotted so the assembly can be
removed. Remove the summing board by gently pushing the board and bracket
assembly toward the bottom of the enclosure where the glands are located, as
shown in Figure 2-32.
2-20
NOTES:
1. USE 6-CONDUCTOR SHIELDED
CABLE FOR HOME RUN CABLE.
2. SINGLE 4-WIRE CELLS: JUMPER
+EXE TO +SEN AND JUMPER -EXE
TO -SEN AT LOAD CELL TERMINALS
3. MULTIPLE 4-WIRE CELLS: JUMPER
+EXE TO +SEN AND JUMPER -EXE
TO -SEN AT JUNCTION BOX INPUT
TERMINALS.
4. WIRE SIZE:
2
18 AWG (0.8mm ) MAXIMUM
2
24 AWG (0.2mm ) MINIMUM
Figure 2-31: Load Cell TerminationS
Note for the standard four-wire cable: If an increase in load results in a
decrease in weight display, reverse the signal wires (+SIG and −SIG).
NOTES:
1. USE 6-CONDUTOR SHIELDED
CABLE.
2. WIRE SIZE:
2
18 AWG (0.8mm ) MAXIMUM
2
24 AWG (0.2mm ) MINIMUM