Nexen CFL User manual

1FORM NO. L-20281-C-0310
FORM NO. L-20281-C-0310
NARROW WEB CANTILEVER TENSION
SENSORS - TYPE CFL
WEB CONTROL PRODUCTS
User Manual

2
FORM NO. L-20281-C-0310
Copyright 2009 Nexen Group, Inc.
Nexen Group, Inc.
560 Oak Grove Parkway
Vadnais Heights, Minnesota 55127
ISO 9001 Certified
This document is the original, non-translated, version.
Conformity Declaration: In accordance with Appendix II B of CE Machinery Directive (2006/42/EC):
A Declaration of Incorporation of Partly Completed Machinery evaluation for the applicable EU directives
was carried out for this product in accordance with the Machinery Directive. The declaration of incorporation
is set out in writing in a separate document and can be requested if required.
This machinery is incomplete and must not be put into service until the machinery into which it is to be
incorporated has been declared in conformity with the applicable provisions of the Directive.
Read this manual carefully before installation and operation.
Follow Nexen’s instructions and integrate this unit into your
system with care. This unit should be installed, operated and
maintained by qualified personnel ONLY. Improper installation
can damage your system, cause injury or death. Comply with
all applicable codes.
DANGER
In accordance with Nexen’s established policy of constant product improvement, the specifications contained in this
manual are subject to change without notice. Technical data listed in this manual are based on the latest information
available at the time of printing and are also subject to change without notice.
Technical Support: 800-843-7445
[phone]
www.nexengroup.com

3FORM NO. L-20281-C-0310
Table of Contents
General Information -----------------------------------------------------------------------------------------------------------------------------4
Installation ----------------------------------------------------------------------------------------------------------------------------------------5
Electrical Connections ------------------------------------------------------------------------------------------------------------------------6
Temperature Compensation ----------------------------------------------------------------------------------------------------------------7
Troubleshooting ----------------------------------------------------------------------------------------------------------------------------------7
Service Assistance and Repair -------------------------------------------------------------------------------------------------------------8
Replacement Parts -----------------------------------------------------------------------------------------------------------------------------8
Warranty --------------------------------------------------------------------------------------------------------------------------------------------9

4
FORM NO. L-20281-C-0310
GENERAL INFORMATION
RECEIVING AND UNPACKING
Handle and unpack the equipment carefully. Upon arrival, check
the shipment against the packing list. Any damage should be
reported immediately to the carrier and to your authorized Nexen
Web Handling Distributor.
Equipment which will not be installed immediately should be
stored in a clean, dry location. Precautions should be taken to
prevent moisture, dust, and dirt from accumulating in storage
and installation area.
PRECAUTIONS
Shipping and Handling
The Tension Sensor must be removed when a machine is shipped. The Tension Sensor must be completely surrounded by a soft
foam cushion when being transported.
Overloading and Overvoltage
Repetitive overloading above the maximum Force, shock, or severe
overloading should be avoided because they will damage the unit.
The excitation voltage should not exceed 6VDC or AC (RMS).
Excessive voltage can destroy the semiconductor strain gages.
SPECIFICATIONS
Gage Resistance ..............................................................................................................................................................240 ohms per gage nominal
Excitation Voltage.......................................................................................................................................................6.0 VDC or VAC (RMS) nominal
Output Signal at Rated Maximum Force .............................................................................................................................................250mV nominal
Output Impedance .......................................................................................................................... SIZE 1 Approximately 850 ohms at 77o F
SIZE 2 and 4 Approximately 120 ohms at 77o F
Required Input Impedance of Tension Amplifier ........................................................................................................................................5000 ohms
Insulation Breakdown Voltage Gage to Beam .............................................................................................................................................. 50V peak
Operating Temperature ............................................................................................................................................................................0o F to +150o F
Maximum Roller Speed ....................................................................................................................................................................................4000 RPM
The voltage between the gage and beam or base (ground) should
not exceed a peak of 50VDC or AC. Exceeding this voltage can
cause an insulation breakdown between the gage and the beam.

5FORM NO. L-20281-C-0310
INSTALLATION
SELECTION OF SENSOR MOUNTING LOCATION
NOTE
When selecting a sensor mounting location, keep in mind the tension sensing roll must not be mounted where the web
wrap can vary. Any change in wrap angle will be sensed by the sensor as a change in tension and indicated as such on the
indicator (See Figure 2).
FIGURE 1
TABLE 1
FIGURE 2
DESCRIPTION
The Type CFL Tension Sensor was designed to measure tension
in webs having a width of up to 14 inches. Sensing beams to
which semiconductor strain gages are bonded form a half bridge
circuit. With these high signal output gages, a very small force
on the roller is shown as a change in the tension output signal.
See Figure 1 and Table 1 for mounting dimensions.
DIMENSIONS IN INCHES
ALLOW 2.5 IN. CLEARANCE FOR CONNECTOR
SIZE F H K L M N O P
1T 1.73 2.00 2.00 5.33 5/16 2.75 0.38 3.38
2T 2.73 2.00 2.00 10.83 5/16 3.75 0.62 3.38
4T 3.73 2.45 2.90 19.83 5/16 3.75 0.62 4.50

6
FORM NO. L-20281-C-0310
GENERAL INSTALLATION INFORMATION
Mount the base of the sensor so the force applied by the web will
be perpendicular to the load line label (See Figure 3).
If present mounting holes are to be used or if for some reason new
holes cannot be drilled, the sensor can be rotated 90° in either
direction. If the load line label is not lined up with the applied
force, some sensitivity will be lost.
FIGURE 3
ELECTRICAL CONNECTIONS
Use the cables provided with the sensors and the installation wiring
diagram supplied with the Nexen tension indicator or controller for
making the transducer connections. Make certain the cables do
not interfere with the web path and they are away from gearing or
other moving parts. Use only the Nexen supplied cables which
include half bridge resistors in the cable connector shell.
These wiring diagrams are for reference only (See Figures 4 and
5). All of the Nexen indicators and controls will accept a half
bridge input as shown in Figures 4 and 5.
FIGURE 4
SIZE 1
FIGURE 5
SIZES 2 AND 4
COMPRESSION
GAGEGAGE 1 COMPRESSION GAGE 2
TEMPERATURE
COMPENSATION
NETWORK
TENSION
GAGE 1 TENSION GAGE 2
C
A
B
SENSOR
(+)
(+)
(–)
(–)
EXCITATION
VOLTAGE
OUTPUT
SIGNAL
SHIELD
OUTPUT
SIGNAL
RED
WHT
GRN
147
147
BLK

7FORM NO. L-20281-C-0310
TEMPERATURE COMPENSATION
Size 1 Tension Sensors are supplied with a temperature
compensation network which is in series with the output signal
lead. The compensation circuit is designed to be used with a
tension amplifier which has an input impedance of 5K ohms.
If other than the input impedances given above are used, drift
will occur in the tension amplifier output when the transducer
temperature changes. Size 2 and 4 Tension Sensors use a
beam material that does not require temperature compensation.
TABLE 3
SIZES 2 AND 4
TABLE 2
SIZE 1
TROUBLESHOOTING
SENSOR GAGE RESISTANCE CHECK
(WITH CABLE REMOVED)
MEASUREMENT RESISTANCE
Pin B to Pin C 480 ohms ±72 ohms
Pin A to Pin B 700 to 1400 ohms
Pin A to Pin C Equal to Pin A to Pin B
±12 ohms
SENSOR GAGE RESISTANCE CHECK
(WITH CABLE REMOVED)
MEASUREMENT RESISTANCE
Pin B to Pin C 480 ohms ±72 ohms
Pin A to Pin B 240 ohms ±36 ohms
Pin A to Pin C Equal to Pin A to Pin B
±12 ohms
PROBLEM PROBABLE CAUSE SOLUTION
Low output signal. Sensor has too large a rated
maximum Force for the application.
Replace with a lower rated maximum Force sensor
or increase the web wrap angle.
Output signal fails to
increase with added
load.
Sensor is overloaded and is hitting
the mechanical stop.
Replace the Sensor with one having a higher rated
maximum Force or reduce the load. (This may be
accomplished by reducing the web wrap angle).
Wrong polarity of output
signal.
Sensor may be incorrectly oriented. Make certain the web force is being applied to the
top side of the transducer which is identified by the
load line label (See Figures 2 and 3). If rotation is
impossible, interchange the sensor's Output Signal
leads (green and white) at the tension meter or
controller (See Figure 4 and 5).
No output signal. Connecting cable might be crimped,
cut, or making bad connection.
Check to see all connections have been made
completely. Check for places where the
connection cable might be crimped or cut.
Replace cables if necessary.
Very high output with no
load.
Faulty sensor or bad connections. Check cable and connector for good connections
and check continuity of cable with an ohmmeter.
Check for proper wiring to transducer. Check
sensor gage resistance as given in Tables 2 and 3
at room temperature with no load applied.

8
FORM NO. L-20281-C-0310
SERVICE ASSISTANCE AND REPAIR
CAUTION
Disassembly by improperly trained personnel may result in additional damage to the unit. Contact the factory if repairs
become necessary.
For additional service assistance, please obtain the Nexen part
number and serial number from the nameplate.
REPLACEMENT PARTS
Contact your authorized Nexen Web Handling Distributor for
parts availability. This unit is not field serviceable. The only field
replaceable component is the cable.
Contact your authorized Nexen Web Handling Representative.
PART NUMBER DESCRIPTION
30517 Cable Assembly with Resistors

9FORM NO. L-20281-C-0310
Nexen Group, Inc.
560 Oak Grove Parkway
Vadnais Heights, MN 55127
800.843.7445
Fax: [phone]
www.nexengroup.com
ISO 9001 Certified
WARRANTY
Warranties
Nexen warrants that the Products will (a) be free from any defects in material or workmanship for a period of 12 months
from the date of shipment, and (b) will meet and perform in accordance with the specifications in any engineering drawing
specifically for the Product that is in Nexen’s current product catalogue, or that is accessible at the Nexen website, or that is
attached to this Quotation and that specifically refers to this Quotation by its number, subject in all cases to any limitations
and exclusions set out in the drawing. NEXEN MAKES NO OTHER WARRANTY, EXPRESS OR IMPLIED, AND ALL
IMPLIED WARRANTIES, INCLUDING WITHOUT LIMITATION, IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. This warranty applies only if: (a) the Product
has been installed, used and maintained in accordance with any applicable Nexen installation or maintenance manual
for the Product; (b) the alleged defect is not attributable to normal wear and tear; (c) the Product has not been altered,
misused or used for purposes other than those for which it was intended; and (d) Buyer has given written notice of the
alleged defect to Nexen, and delivered the allegedly defective Product to Nexen, within one year of the date of shipment.
Exclusive Remedy
The exclusive remedy for the Buyer for any breach of any warranties provided in connection with this agreement will be,
at the election of Nexen: (a) repair or replacement with new, serviceably used, or reconditioned parts or products; or (b)
issuance of credit in the amount of the purchase price paid to Nexen by the Buyer for the Products.
Agent's Authority
Buyer agrees that no agent, employee or representative of Nexen has authority to bind Nexen to any affirmation,
representation, or warranty concerning the Products other than those warranties expressly set forth herein.
Limitation on Nexen’s Liability
TO THE EXTENT PERMITTED BY LAW NEXEN SHALL HAVE NO LIABILITY TO BUYER OR ANY OTHER PERSON
FOR INCIDENTAL DAMAGES, SPECIAL DAMAGES, CONSEQUENTIAL DAMAGES OR OTHER DAMAGES OF
ANY KIND OR NATURE WHATSOEVER, WHETHER ARISING OUT OF BREACH OF WARRANTY OR OTHER
BREACH OF CONTRACT, NEGLIGENCE OR OTHER TORT, OR OTHERWISE, EVEN IF NEXEN SHALL HAVE
BEEN ADVISED OF THE POSSIBILITY OR LIKELIHOOD OF SUCH POTENTIAL LOSS OR DAMAGE. For all of
the purposes hereof, the term "consequential damages" shall include lost profits, penalties, delay damages, liquidated
damages or other damages and liabilities which Buyer shall be obligated to pay or which Buyer may incur based upon,
related to or arising out of its contracts with its customers or other third parties. In no event shall Nexen be liable for any
amount of damages in excess of amounts paid by Buyer for Products or services as to which a breach of contract has
been determined to exist. The parties expressly agree that the price for the Products and the services was determined
in consideration of the limitation on damages set forth herein and such limitation has been specifically bargained for and
constitutes an agreed allocation of risk which shall survive the determination of any court of competent jurisdiction that
any remedy herein fails of its essential purpose.
Inspection
Buyer shall inspect all shipments of Products upon arrival and shall notify Nexen in writing, of any shortages or other failures
to conform to these terms and conditions which are reasonably discoverable upon arrival without opening any carton
or box in which the Products are contained. Such notice shall be sent within 14 days following arrival. All notifications
shall be accompanied by packing slips, inspection reports and other documents necessary to support Buyer's claims. In
addition to the foregoing obligations, in the event that Buyer receives Products that Buyer did not order, Buyer shall return
the erroneously shipped Products to Nexen within thirty (30) days of the date of the invoice for such Products; Nexen
will pay reasonable freight charges for the timely return of the erroneously shipped Products, and issue a credit to Buyer
for the returned Products at the price Buyer paid for them, including any shipping expenses that Nexen charged Buyer.
All shortages, overages and nonconformities not reported to Nexen as required by this section will be deemed waived.
Limitation on Actions
No action, regardless of form, arising out of any transaction to which these terms and conditions are applicable may be
brought by the Buyer more than one year after the cause of action has accrued.