TROUBLESHOOTING
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CYGNUS
MI 850A316 1 B
Page 41 of 66
Table 1.
Load cell diagnostics
21 mv Load Cells
All voltages without a code that are not in the Normal Range are unspecified faults.
Normal Range is 0.00 VDC +/- 0.25 VDC
TB6-2 (S+)
-5.000
-1.667
-1.000
0.000 1.000 1.667 2.500 5.000
TB6-1 (S-)
-5.000
A
D
-1.667
J
M
G
-1.000
P
0.000
C
L
Normal
O
E
1.000
Q
1.667
H
N
K
2.500
I
5.000
F
B
CODE
21 mv Load Cells (Could be either load cell or cable)
Probable Fault
A
TB6-4 (P+) open
B
TB6-3 (P-) open
C
TB6-4 (P+) to TB6-2 (S+) leg open
D
TB6-4 (P+) to TB6-1 (S-) leg open
E
TB6-3 (P-) to TB6-2 (S+) leg open
F
TB6-3 (P-) to TB6-1 (S-) leg open
G
(TB6-4 (P+) and TB6-2 (S+) reversed) or (TB6-3 (P-) and TB6-1 (S-) reversed)
H
(TB6-4 (P+) and TB6-1 (S-) reversed) or (TB6-3 (P-) and TB6-2 (S+) reversed)
I
P- is wired to Ground. Should be wired to TB6-3.
CODE
21 mv Load Cells (Could be either load cell or cable)
Probable Fault
J
TB6-4 (P+) open
K
TB6-3 (P-) open
L
TB6-4 (P+) to TB6-2 (S+) leg open
M
TB6-4 (P+) to TB6-1 (S-) leg open
N
TB6-3 (P-) to TB6-2 (S+) leg open
O
TB6-3 (P-) to TB6-1 (S-) leg open
P
(TB6-4 (P+) and TB6-2 (S+) reversed) or (TB6-3 (P-) and TB6-1 (S-) reversed)
Q
(TB6-4 (P+) and TB6-1 (S-) reversed) or (TB6-3 (P-) and TB6-2 (S+) reversed)
Voltage one either
500 mv Load Cell
TB6-1 (S+) or TB6-2(S+)
Probable Fault
Negative
Wired to -5 Vdc. Should be wired to
Ground
0.000
Wired to -5 Vdc. Should be wired to
Ground
Signal and Ground leads reversed.
Power lead
open
2.500
Normal voltage
5.000
Ground lead
open
Signal and Power leads reversed.
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