2015 Designer's Notebook - 62
CL Cantilevered Load Cells for Narrow Web Applications
Load Cells & Readouts
Specifications
Gage Resistance
350 Ω
Excitation Voltage
10 VDC maximum
Output Signal
21 mVDC maximum per sensor at
full load rating
Operating Temperature
-30˚C to 80˚C
Temp. Effect on Zero
0.02% of rating per ˚C
Combined Non-Linearity & Hysteresis
Size 1
Size 2
0.5% of full scale maximum
1.5% of full scale maximum
Repeatability
0.2% of full scale maximum
Deflection at Full Load
0.28 mm (0.011 inch) maximum
Protection Class
IP67
Certification
CE
Mating Cable Assembly
Use LCC Cable series
Mating Connector Only
12B220-1 (pin 1 + power; pin 2 +
signal; pin 3 - signal; pin 4 - power)
MAGPOWR model CL Cantilever Load Cells are designed to
support cantilevered idler rolls in processing machines which
only have one side frame, and to accurately measure and
control tension in a narrow moving web. They are typically
used on paper, film, foil, fabrics or any materials used in the
label, tag, tape, printing or converting industry.
A unique advantage of these load cells is their ability to
accept the customer's roll and shaft assembly. No longer is
the user restricted in design to a special roll at the design
location. He simply installs one of his own spare roll
assemblies into the model CL Load Cell. Another advantage
of these load cells is the capability to be mounted on either
side of the machine frame. This allows the process rolls to
be mounted flush to the machine frame to minimize
overhang when the load cell is mounted on the back side of
the machine frame.
The model CL Load Cells are ruggedly
constructed with built-in mechanical
overload stops. A full Wheatstone bridge
arrangement is incorporated in each load
cell for the most accurate means of
measuring web tension. There are 2 sizes
available with 5 tension sensing ranges up
to 500 lb. IP67 protection ensures reliable
operation in applications where wash-down
(and even submersion) are required.
62
Load Cells & Readouts
SIZING-Narrow Web
To select the load cell, the total load on the roll must be calculated. This load
is the sum of the tension components in the sensing plane, plus the pulley
weight components in the sensing plane. The equation for this load is:
LOAD = 2T (sin (X/2)) + (W cos Y)
This is the total load. But, since tension transients are unknown, and are
generally quite large, a "factor of safety" of 2 should be used. The final
equation for load rating required for the load cell is then:
L= 4T (sin (X/2)) + (W cos Y)
To select a load cell, apply this equation and choose a load cell with a load
rating greater than L. For example, if the web tension is 15 lb, the angle Y is
30˚, and the wrap angle is 70˚, the resulting load cell rating is:
L=4 (15) (sin (70˚/2)) + 5 cos 30˚
L = 38.75 lb
Therefore, use a CL1-50 or CL2-50 load cell.
Sine/Cosine Functions
Degrees
Sine
0
5
10
15
20
25
30
35
40
45
.0000
.0872
.1736
.2588
.3420
.4226
.5000
.5736
.6428
.7071
Cosine Degrees
1.000
.9962
.9848
.9659
.9397
.9063
.8660
.8192
.7660
.7071
50
55
60
65
70
75
80
85
90
Sine
Cosine
.7660
.8192
.8660
.9063
.9397
.9659
.9849
.9962
1.000
.6428
.5736
.5000
.4226
.3420
.2588
.1736
.0872
.0000
Table of Contents for the Digital Edition of 2015 Designer's Notebook
Table of Contents
2015 Designer's Notebook - Cover1
2015 Designer's Notebook - Cover2
2015 Designer's Notebook - Table of Contents
2015 Designer's Notebook - 2
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2015 Designer's Notebook - Cover3
2015 Designer's Notebook - Cover4
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