Warner Electric C30 Single Range Tensioncells - Manual (Page 5)

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Warner Electric • 800-825-9050 P-2012-4
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.030” 0.0 .030”
3.5 V. Set Point
Tension Compression
LVDT Output vs Deflection
O
u
t
p
u
t
V
o
l
t
a
g
e
Deflection
Figure 4
With Warner Electric LVDTs, the input and out-
put circuits are electrically isolated from each
other and from the mechanical structure of the
tensioncell. Thus, they may be used in "floating
ground" or "ground return" systems. This elimi-
nates the need for extra circuit boards which are
required for most straingage loadcells.
Tensioncells are factory adjusted to provide an
offset voltage with no load applied (no deflec-
tion). Using an input of 24 volts DC, the LVDT is
set to provide an output of 3.5 volts into a resis-
tive load of not less than 100,000 ohms. The
voltage resulting from the maximum rated
deflection then adds to or subtracts from the 3.5
volt offset. This results in an output voltage of
3.5 to 6.5 volts in the Compression Mode and
3.5 to 0.5 volts in the Tension Mode. (See
Figure 4)
While acceptable performance may be obtained
over an input voltage range of 6.0 to 30.0 volts
DC, the output voltage will vary in direct propor-
tion to the input voltage. Because of this, the
use of a well regulated constant voltage power
supply is essential for accurate and repeatable
tension measurement.
In standard applications, where two Tensioncells
are used, the inputs may be connected in paral-
lel allowing the Tensioncells to be excited from
the same power supply. The LVDT outputs are
then summed to obtain a signal representing the
strip tension and tare loads distributed across
the roll.
LVDT Output vs. Deflection Chart
Description of Operation
The total resultant load per cell (RF) is calculated
by resolving all force vectors acting upon the
Tensioncell, with respect to the Loading Line (OL).
(RF) is the resultant of both TENSION and TARE
loads, PER CELL!! (See Figure 5)
Nominal
L
R
(Figure 5)