Warner Electric B30 User Manual
B30 Single Range Tensioncells
P-2012-4
819-0404
Installation Instructions
Contents
General Information . . . . . . . . . . . . . . . . . . . 3
Installation and Operation . . . . . . . . . . . . . . . 7
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . 8
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . 9
Recalibration . . . . . . . . . . . . . . . . . . . . . . . 10
Dimension Drawing . . . . . . . . . . . . . . . . . . 12
Warranty . . . . . . . . . . . . . . . . . . . . . . Back Page
Failure to follow these
instructions may result in product damage,
equipment damage, and serious or fatal
injury to personnel.
Warner Electric • 800-825-9050 P-2012-4 • 819-0404
2
Description
W1
W2
Machine
Frame
B30 Series Tonsioncell
Single Bolt Mounting
Internal
Bearing
Damper
C-Flexure
Far Side
Mechanical Stop
Load
Plate
LVD T
LVDT
Core
General Information
Warner Electric Series 30 Type B Tensioncells
are force transducers especially designed to
measure and control web tension on continuous
strip processing lines. They are normally installed in matched pairs at each end of a measuring roll. (See Figure 1)
A Tensioncell consists of a unique combination
of two integral systems (one mechanical, the
other electrical) for converting the mechanical
force of strip tension into an electrical signal
which is directly proportional to the strip
tension.
Type "B" Tensioncells are intended for
NON-ROTATING shaft installations. A
self-aligning shaft clamp assures proper
alignment of the measureing roll when the
tension cells are bolted to the machine frame.
Type "B" Tensioncells are supplied in matched
pairs, one to be mounted at each end of the
tension measuring roll. Note that the cell marked
"W2" is a mirror image of "W1". The 'W2" cell
allows for thermal expansion of the shaft.
(See Figure 1)
The Mechanical System
The mechanical system consists of a Patented
"C-Flexure Pivot Assembly" which incorporates
a mounting Base Block, frictionless elastic pivot
(or hinge), and Load Plate. (See Figure 2) When a
mechanical force is applied to the Load Plate,
the pivot permits its deflection toward or away
from the Base Block.
Figure 2
Warner Electric • 800-825-9050 P-2012-4 • 819-0404
Type B - Bearings in Roll - Non-Rotating Shaft
Figure 1
3
For our discussion here, deflection of the Load
Black - (2)
Red + (1)
Green (3)
Blue (4)
Input
Output
X Twisted Leads
A B
Oscillator Demodulator
P1
S1
S2
X
X
When Supplied
with Cable
(1) Red + DC
(2) Black – DC
(3) Green – Signal
(4) White + Signal
C D
BAC
D
Plate toward the Base Block is defined as the
"Compression Mode", while the opposite is
defined as the "Tension Mode". Tensioncells are
designed to operate equally well in either mode.
The Base Block contains an integral Mechanical
Stop to limit the amount of deflection in either
direction, and a Viscous Damper to allow
control of the tensioncell response to rapid
changes in apparent tension loads. (See Page 3,
Figure 2)
Type "K" DC LVDT
As illustrated in Figure 3, a DC LVDT consists of
the following components:
• An oscillator, which converts the DC input
voltage into a high frequency alternating
current for exciting the primary coil (P1)
• A Primary Coil (P1)
• A movable, permeable metallic core
• Two Secondary Coils (S1 and S2)
The Electrical System
The electrical system consists of a Linear
Variable Differential Transformer (LVDT) which
converts the mechanical deflection of the Load
Plate into a useful electrical output signal. (See
Figure 3.) The movable core of the LVDT is
mechanically coupled to the Load Plate by
means of the Core Adjust Assembly. (See
Figure 3) This adjustment is factory set and is
not accessible.
• A demodulator and summing network to
rectify and integrate the currents from the
Secondary Coils
Figure 3
Warner Electric • 800-825-9050 P-2012-4 • 819-0404
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7
6
5
4
3
2
1
0
.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
With Warner Electric LVDTs, the input and
Nominal
L
R
output 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
eliminates 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
deflection). Using an input of 24 volts DC, the
LVDT is set to provide an output of 3.5 volts into
a resistive 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)
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
proportion 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
parallel 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.
Warner Electric • 800-825-9050 P-2012-4 • 819-0404
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)
The intrinsic design of Warner Electric Tensioncells allows the location of the Resultant Load of
Strip Tension (H) on any angle with respect to
the Load Line (OL). Note, however, that the Total
Force vector (RF) must always be calculated on
the line (OL).
Figure 5
5
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