Load Cells; Setting The Load Cell Compensation Jumper - Rice Lake IQ plus 210 Installation Manual

Microprocessor
RESET
J1 A / D C o n v e r t e r
To setup switch
GND
2.3.2

Load Cells

Wire the load cell cable from the load cell or junction box to connector J5 as shown in Table 2-2. If using 6-wire load cell cable
(with sense wires), remove jumpers JP1 and JP2 (see
All models come with ten feet of color-coded load cell cable. Do not cut this cable. The load cell is temperature-
Note
compensated for an exact cable length often feet. Cutting the load cell cable voids the load cell warranty.
When connections are complete, use two cable ties to secure the load cell cable to the inside of the enclosure.
Use grounding procedure described in
Note
For 6-wire connections, remove jumpers JP1 and JP2.
2.3.3

Setting the Load Cell Compensation Jumper

The load cell compensation jumper (above the
of load cell connected to the indicator:
• For load cells with balanced bridges, set the jumper in the OFF position. Example of balanced load cells include the
RL1040, RL1250, RL1260, RL1380, and RL1385.
• For load cells with unbalanced bridges, follow the procedure below to determine the correct jumper position. Examples of
unbalanced cells include the RL1042 and RL1010.
To determine the correct jumper position for unbalanced cells, do the following;
1. Disconnect load cell from indicator.
2. Use an ohmmeter to measure +EXC to +SIG and +EXC to –SIG. Measured values between the excitation line and each
of the signal lines should be within 2–3.
JP2
JP1
U N I T S
B u t t o n
GND J4
1 1
J2 J3
DIGIN 2 DIGIN 1
Figure 2-2. IQ plus 210 CPU and Power Supply Board
Figure
J5 Pin Function
1 +SIG
2 –SIG
3 +SENSE
4 –SENSE
5 +EXC
6 –EXC
Table 2-2. J5 Pin Assignments and Load Cell Wire Color
Section 2.3.1 on page 4
button location on the CPU board; see
ZERO
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DIGITAL
ANALOG
+5V
+5V
TEST
TEST
VR1 VR2
VR3
Z E R O
B u t t o n
LOAD CELL CONNECTOR
1 2 3 4 5 6 7
J5
2-2). For 4-wire installation, leave jumpers JP1 and JP2 on.
RL1040
RL1042 RL1380
Red White
White Red
Blue --
Brown --
Green Green
Black Black
to attach shield wire to backplate.
SERIAL COMM
TP1
Tr a n s f o r m e r
TP2
J8
F1
J6
P o w e r
I n p u t
Figure 2-2) must be set for the type
Installation
TxD
1
GND
2
RxD
3
J7
F2
5