FORM NO. L-20341-E-0208
THEORY OF OPERATION
front panel and contact closures. There are two sets of
contacts, one for overfeed or splice and one for break.
The Sensor is an ultrasonic sensor composed of a
sender and receiver. Each unit is provided with a mount-
ing bracket and 16 Ft. [5 m] of cable to interface with the
PC210. The ultrasonic signal allows the Sensor to see
through clear and opaque film, paper, foil, and laminates,
without false triggering caused by patterns or print on the
web.
INSTALLATION
in
mm
FIGuRE 1
The PC210 Controller can be panel or shelf mounted in
any location suitable for electronic controls. Locations
for electronic controls must be free of shock, vibrations,
high temperatures, and moisture.
The sending and receiving elements of the Sensor are
provided with a 16 Ft. [5 m] cable to interface with the
PC210.
NOTE: The PC210 must be mounted within the cable
length of the Sensor. The cable length must not be
increased.
Nexen’s PC210 Paper Checker system is used on
web-fed machinery to detect web breaks or splices. On
sheet-fed presses or bag machines, the Paper Checker is
used to detect double sheet-feeding.
The Paper Checker system is composed of two parts:
the PC210 Paper Checker Control and UH200 Sensor.
The PC210 provides the excitation signal to the Sensor
and reads the return signal. The PC210 also indicates
machine feed conditions through LEDs located on the
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