Rice Lake IQ plus 2100SL Digital Bench Scale - Manual (Page 24)

4 IQ plus 2100 Installation Manual
Figure 2-2. IQ plus 210 CPU and Power Supply Board
2.2.2 Load Cells
Wire the load cell cable to connector J5 as sho wn in
Table 2-1. If using 6-wire load cell cable (with sense
wires), remove jumpers JP1 and JP2 (see Figure 2-2).
For 4-wire installation, leave jumpers JP1 and JP2 on.
NOTE: All models come with ten feet of color-coded
load cell cable. Do not cut this cable! The load cell is
temperature-compensated for an exact cable length of
ten feet. Cutting the load cell cable voids the load cell
warranty.
When connections are complete, use tw o cable ties to
secure the load cell cable to the inside of the enclosure.
2.2.3 Setting the Load Cell Compensation Jumper
The load cell compensation jumper (abo ve the
ZERO
button location on the CPU board; see Figure 2-2) must
be set for the type of load cell connected to the
indicator:
• For load cells with balanced bridges, set the
jumper in the OFF position. 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 2–3Ω.
3. Next, measure –EXC to +SIG and –EXC to
–SIG. Measured v alues between the e xcitation
line and each of the signal lines should be within
2–3Ω.
4. If the +EXC measurements (step 2) are ≥ 5%
larger than the –EXC measurements (step 3), set
the compensation jumper in the ON position. If
the +EXC measurements are < 5% greater (or are
less) than the –EXC measurements, set the
jumper in the OFF position.
F1 F2
Blue wire
J8
Brown wire
J1
To setup switch
J7
1
2
3
SERIAL COMM
TxD
GND
RxD
VR3
LOAD CELL CONNECTOR
1 2 3 4 5 6
–SIG
+SENSE –SENSE
+EXC –EXC +SIG
J5
J2 J3
1 1
GND
DIGIN 2 DIGIN 1
J6 J4
GND
BR1
–
+
VR1 VR2
JP1
JP2
RESET
ANALOG
+5V
TEST
DIGITAL
+5V
TEST
TP1
TP2
A / D C o n v e r t e r
Microprocessor
Tr a n s f o r m e r
U N I T S
B u t t o n
Z E R O
B u t t o n
P o w e r
I n p u t
ON
OFF
JP1
Load cell
compensation
jumper
GND
J5 Pin Function
Load Cell Wire Color
RL1040
RL1042
RL1380
1 +SIG Red White
2 –SIG White Red
3 +SENSE Blue —
4 –SENSE Brown —
5 +EXC Green Green
6 –EXC Black Black
NOTES:
1.Use grounding procedure described in Section 2.2.1
on page 3 to attach shield wire to backplate.
2.For 6-wire connections, remove jumpers JP1 and JP2.
Table 2-1. J5 Pin Assignments