Siemens SIWAREX R Betriebsanleitung - Seite 18
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Edition 06/2009
•
Apply test weight to all 4 corners and note values:
LC 1 = 160kg
LC 2 = 148kg
LC 3 = 155kg
LC 4 = 152kg
•
Determine differences to the smallest value (148kg):
LC 1 - LC 2 = 160kg - 148kg = 12kg
LC 3 - LC 2 = 155kg - 148kg = 7kg
LC 4 - LC 2 = 152kg - 148kg = 4kg
•
Calculate correction resistance:
R
corr
LC 1: R
LC 2: smallest value -> no resistance necessary
LC 3: R
LC 4: R
R
= determined correction resistance (to be installed in the measuring line
corr
SIG+)
R
= output resistance of the load cells (can also be measured in the loaded
a
state)
L
= weight error (difference value from the smallest weight value)
error
L
= test load (applied at all corners)
test
•
Install resistors and repeat test
EXC+ 10VDC
EXC- 0VDC
Figure 3-2 Circuit diagram reference load adjustment
SIWAREX R Load Cells Operating Manual
A5E00159640
= R
x L
/ L
a
error
test
= R1 = 1004.52 Ω x 12kg / 150kg = approx. 80 Ω
corr
= R3 = 1010.70 Ω x 7kg / 150kg = approx.47 Ω
corr
= R4 = 1028.12 Ω x 4kg / 150kg = approx. 27 Ω
corr
LC 4
EXC+
SIG +
SIG -
EXC-
R4
Ω
27
47
SIG+
SIG-
LC 3
EXC+
EXC+
SIG +
SIG +
SIG -
EXC-
EXC-
R3
Ω
Commissioning
LC 2
LC 1
EXC+
SIG -
SIG -
SIG +
EXC-
R1
Ω
80
18