Nexen WEB CONTROL LH100 User manual

1FORM NO. L-20334-C-0404
WEB CONTROL PRODUCTS
User Manual
LINE FOLLOWER SENSOR
LH100
FORMNO.L-20334-C-0404

2FORM NO. L-20334-C-0404
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
Copyright 1999 Nexen Group, Inc.
Nexen Group, Inc.
560 Oak Grove Parkway
Vadnais Heights, Minnesota 55127
ISO 9001 Certified
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 or cause injury or death.
Comply with all applicable codes.
DANGER

3FORM NO. L-20334-C-0404
TABLEOFCONTENTS
Introduction----------------------------------------------------------------------------------------------------------------------------------------4
Installation ----------------------------------------------------------------------------------------------------------------------------------------- 4
Mounting Dimensions -----------------------------------------------------------------------------------------------------------------5
Electrical Connections -----------------------------------------------------------------------------------------------------------------------5
Wiring Installation Guidelings-------------------------------------------------------------------------------------------------------------- 6
Indicators and Switches ---------------------------------------------------------------------------------------------------------------------7
Operation ------------------------------------------------------------------------------------------------------------------------------------------8
Specifications------------------------------------------------------------------------------------------------------------------------------------9
Warranties---------------------------------------------------------------------------------------------------------------------------------------10

4FORM NO. L-20334-C-0404
INTRODUCTION
Nexen’s LH100 Line Follower Sensor optically detects register lines, patterns, and edges. The LH100 offers improved
detection capabilities, especially for yellow and light blue. Combining the LH100 with one of Nexen’s Web Guide
Controllers provides Line Follower Control (LFC) and Edge Position Control (EPC).
FIGURE1
FIGURE2
The LH100 has two output voltage ranges to meet the
requirementsofdifferentcontrollers:
High (H): 0–5 VDC
Low (L): 0–600 mVDC
The LH100 selector switch comes factory set to "L". To
ensure proper operation, set the LH100 sensor output
selectorswitch"H"or"L" accordingtotherequirements
of the web guide controller you are using.
ADJUSTING THE OUTPUT VOLTAGE SETTING
1. Remove the selector switch cover to access the
High/Low switch (See Figure 1).
2. Use a small, flat-blade screw driver to adjust the
High/Low switch to the desired setting. Turn the
switch until it comes to a stop on H or L.
OUTPUT VOLTAGE SETTINGS
INSTALLATION
1. Secure the Mounting Bracket to a customer
supplied mounting bar (See Figure 2).
NOTE:ThecenterlineoftheLH100mustbeperpendicular
(90o) to the web surface (See Figure 3).
2. Secure the LH100 to the threaded extension of the
Screwguide mounted across the web path. Be sure
it is in a location where the web is supported from
beneath to prevent web flutter. (See Figure 3).
NOTE:Makesurethelocknutonthethreadedextension
is tight against the LH100.
3. Verify that the LH100 and Mounting Bracket are
both securely mounted to the mounting bar.
NOTE:Ifthewebmaterialispaper-like,non-shiny,and/
or rough, remove the Diffuser Cap by turning the cap
counterclockwise.Leaveinplaceforreflectivematerials.
MOUNTING THE LH100 Mounting
Bracket
Screwguide
LH100
Mounting
Bar
FIGURE3
The centerline of the
LH100 must be
perpendicular (90o) to
the web surface. LH100
Diffuser
Cup

5FORM NO. L-20334-C-0404
MOUNTING DIMENSIONS
FIGURE4
LH100 Mounting Dimensions
ELECTRICALCONNECTIONS
FIGURE5
Make the electrical connections between the LH100
and the controller as shown (See Figure 5).

6FORM NO. L-20334-C-0404
WIRING INSTALLATION GUIDELINES
This product is designed to minimize the effects of ElectroMagnetic Interference (EMI) on its operation, but as
with any electronic device, proper installation and wiring methods are necessary to ensure proper operation. By
doing so, the interference from external effects such as electrical line spikes, electrical noise, static electricity, etc.
will be minimized. The following methods outline wiring installation guidelines to protect your system:
• All input and output signal and sensor cables must
be shielded with the shields tied to earth ground at
one end. In case of very high frequency (MHz
range) electrical noise, both ends of the shield need
to be tied to earth ground.
• Keep cable length as short as possible. Think of
them as antennae for noise.
• Use power line filters to suppress interference on
the AC voltage lines that power the unit.
• Place a resistor-capacitor network (snubber) across
inductive coils such as relays and solenoids in order
to stop electrical interference at the source (See
Figure 6).
• Isolate signal and sensor cables from cables
carrying AC voltages, power for high current loads
or relays and solenoids. Either relocate the signal
and sensor cables away from other cables or use
grounded metal conduits to shield them. This will
reduce the potential for noise interference between
the signal and sensor cables and the other noisy
cables.
Figure 6
For environments that experience high levels of static electricity follow these additional guidelines:
• Remove the static charge from material carrying it.
In the case of webs that carry static charges, there
are static charge removal products available such
as static bars and ionized blowers.
• Ensure that sensors and machine frames are
grounded to earth through a low impedance path.
• Wrap grounding tinsel around sensors and cables
that are close to the source of the static electricity
and ground the tinsel to earth.
• Tie all signal and sensor cable shields directly to
earth ground without passing through the electronic
device. This will help prevent high voltage
interference from coupling into other circuits within
the device.
Relay
R
C
Snubber
Snubber applied across relay coil

7FORM NO. L-20334-C-0404
INDICATORS AND SWITCHES
Focal
Display Indicator Center
Display Indicator
Fieldof View
Selector
Switch Color
Selector
Switch
Contrast
Selector
Switch
FIGURE8
Cable
Connector
Receptacle
Line Follower Head
ScanningDirection
Indicator Arrow
Field of
View
Scanning
Direction
Detected Position
Detected Position
FIGURE7
FIGURE9
Edge position detected
better with blue light.
Edge position detected
better with red light.
Red Pattern
BlueLine
FIELD-OF-VIEW SELECTOR SWITCH:used to select the desired
field of view width 2.5/5/10mm [.1/.2/.4 in]). 10mm
is the most common setting, 2.5 and 5mm are used
for restricted field-of-view area where patterns are
close together.
/Red/Blue+RedBlue
NOTE:RefertoFigure7forLH100alignmentonaweb.Use
the Scanning Direction Indicator Arrow to determine the
direction of the LH100 scan. In Figure 7 the arrow is
pointedto theright, so theLH100 scansfrom leftto right.
Refer to Figure 8 for the location of the indicator lights
and switches listed below.
INDICATORS:
CENTER DISPLAY INDICATOR:illuminates when a web edge or
line edge is at the center of the LH100 view field.
FOCAL DISPLAY INDICATOR:illuminates when the mounting
distance and angle (90°) between the LH100 and
the web is correct and the web/line edge is within
the LH100 field-of-view.
SWITCHES:
COLOR SELECTOR SWITCH:used to select the color of the
light source (
Blue+Red is the most common.
NOTE:If an additionalline or pattern of a different color
is within the LH100’s field of view (See Figure 9) the
LH100 may not be able to lock onto the proper edge. In
such a case, select the lamp color that most closely
matchestheintrudingline/pattern.Thiswillmakeitmore
difficult for the LH100 to see that color.
Iftheweborrollerunderneathatransparentwebisless
reflective than the line or edge to be followed, select a
lamp color that is similar to the line or edge.
CONTRAST SELECTOR SWITCH:used to choose which edge of
the line to follow. There are three different mode
options:
NOTE: Look downstream of the web flow and use
the Scanning Direction Indicator Arrow to
determine the LH100 scanning direction. Select a
mode based on the descriptions below:
With selected, the LH100 scans in the direction
of the Arrow, looking for a change from dark to light
and follows that edge. In Figure 7 the right edge of
the line is detected as the control position.
With selected, the LH100 scans in the direction
of the Arrow, looking for a change from light to dark
and follows that edge. In Figure 7 the left edge of
the line is detected as the control position.
With selected, the LH100 scans in the direction
of the Arrow to detect the first contrast change. In
Figure 7 the left edge of the line is detected as the
control position. This is the most common setting.
).

8FORM NO. L-20334-C-0404
OPERATION
FIGURE10
Left Edge
FIGURE11
Focal
Display Indicator Center
Display Indicator
Field-of-View
Switch
Color Selector Switch
Contrast
Selector
Switch
Line Follower Head
ScanningDirection
Indicator Arrow
Field of
View
Scanning
Direction
Detection Position
Detection Position
Web
Direction
Right Edge
First Edge
DESCRIPTION
The LH100 scans in the direction of the arrow printed on
its side (See Figure 11). The LH100 looks for a target
edge within its field of view that matches the setting
made with the Field-of-View Switch (See INDICATORS
AND SWITCHES section). When the target edge is not
centered within the field of view, the LH100 will output a
control signal that will vary in proportion to how far the
target edge is away from center. Each setting of the
Field-of-View Switch has a different output voltage
range. The center of the range corresponds to the target
edge being centered within the field of view.
When a target edge moves from center, the output
voltage will change until the edge leaves the field of
view. This output voltage will remain constant until the
target returns to the field of view. This will allow the web
guide to continue steering the target edge back to
center of the field of view. If the Actuator Lock function
is used, then the web guide will maintain its position at
the instant the target edge leaves the field of view until
the target edge returns.
ACTUATOR LOCK FUNCTION
The Actuator Lock Function automatically turns on the
Actuator Lock Output Transistor whenever the Focal
Display Indicator turns off. The following situations will
cause the Focal Display Indicator to turn off: web or line
edge moving outside the field of view, a break in the line
edge, or improper positioning of the LH100.
Use the Actuator Lock output signal for instances where
there are breaks in the target line or edge that will
reappear quickly. This function will prevent the web
guide from moving out of position while waiting for the
line or edge to reappear.
Do not use the Actuator Lock Function for instances
when the edge moves out of the field of view in a
direction perpendicular to web travel and it is desired to
have the web guide controller steer the edge back.
SETUP
1. Set the Field Of View, Color, and Contrast Selector
switches to appropriate positions.
2. Center the LH100 directly over the line or web edge
and adjust the vertical distance of the LH100 to the web
surface until the Focal Display indicator turns on (See
Figures 10 and 11). For highly reflective webs, be sure
the Diffuser Cap is installed and positioned about 1 mm
[0.04 in] above the web for proper focus (See Figure 4).
3. Adjust the lateral position of the LH100 until the
Center Display indicator turns on and indicates the
center of the field of view is aligned with the appropriate
line, pattern or web edge (See Figures 10 and 11).
4. Calibrate the LH100 to the web guide controller by
referring to the controller’s instruction manual.
5. Test the system setup by slowly pulling the web,
causing the line or edge to move within LH100 field of
view. The LH100 output should cause the web guide to
move in the opposite direction of web movement. This
will bring the line/edge back to center.
6. Disable the Actuator Lock Signal and pull the web
edge or line slowly until it leaves the LH100’s field of
view (the focal display indicator turns off). The web guide
should continue to steer, until it reaches an end-of-travel
limit, in an attempt to move the edge or line back to the
center of the field of view.
7. Enable the Actuator Lock Signal and slowly pull the
web edge or line away from the LH100 until it leaves the
LH100’s field of view (the focal display indicator turns
off). The web guide should stop moving once the line or
edge moves beyond the field of view.

9FORM NO. L-20334-C-0404
SPECIFICATIONS
Detection line width 0.2 mm [0.008 in] or greater (May differ depending on color or gradation of the line.)Detection line width 0.2 mm [0.008 in] or greater (May differ depending on color or gradation of the line.)
Field of view 2.5 mm / 5 mm / 10 mm [0.1 in / 0.2 in / 0.4 in] diameter (selectable)
Resolution 14 µm [0.0005 in]
Light receiving element CCD linear image sensor
Light source High luminance LED (2 colors; blue and red)
Power supply +15 VDC, 300 mA
-15 VDC, 50 mA
Ouput Position signal
Detection field view: 2.5 mm (0.3 V -- 0.5 V low) (2.4 VDC -- 3.7 V high)
Detection field view: 5 mm (0.2 V -- 0.6 V low) (1.7 VDC -- 4.4 V high)
Detection field view: 10 mm (0.1 V -- 0.7 V low) (0.3 mV -- 5.8 V high)
Actuator/lock signal Open collector 30 V, 0.1 A max, ON when the target is lost from the field of view
Mass LH100: 0.6 kg [1.3 lb] (including cable)
Mounting Bracket: 0.5 kg [1.0 lb]
Attached cable length 5 m [16 ft]
Ambient temperature 0° -- 50° C [ 32° -- 122° F]

10FORM NO. L-20334-C-0404
WARRANTIES
Warranties
Nexen warrants that the Products will be free from any defects in material or workmanship for a period of 12 months
from the date of shipment. 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 of the Buyer for any breach of the warranties set out above will be, at the sole discretion of Nexen,
a repair or replacement with new, serviceably used or reconditioned Product, or issuance of credit in the amount of the
purchase price paid to Nexen by the Buyer for the Products.
Limitation of 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 images, 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.
Limitation of Damages
In no event shall Nexen be liable for any consequential, indirect, incidental, or special damages of any nature whatso-
ever, including without limitation, lost profits arising from the sale or use of the Products.
Warranty Claim Procedures
To make a claim under this warranty, the claimant must give written notice of the alleged defect to whom the Product
was purchased from and deliver the Product to same within one year of the date on which the alleged defect first
became apparent.
Nexen Group, Inc.
560 Oak Grove Parkway
Vadnais Heights, MN 55127
800.843.7445
Fax: [phone]
www.nexengroup.com
ISO 9001 Certified