Nexen PC210 913071 - Manual (Page 13)

1
FORM NO. L-20341-E-0208
T
esT
R
un in
W
eb
b
Reak
o
peRaTion
1. Set the Mode Selector Switch to Mode 2 or 5.
2. Set the Web Thickness Selector Switch as
appropriate for web.
3. Set the Power Switch to ON.
4. Check operation according to Table 5.
5. The Test Switch can be depressed prior to testing
to prevent the Web Break Relay from changing state
when a test piece is placed in the sensor path with
an open section (which looks like a web break).
The PC210 is in test mode when the red LED in
the Test Switch glows. When the open section
passes through the sensor, the Normal Run Indicator
should go out and the Web Break Indicator should
glow. The PC210 will return to normal State when a
section of web reenters the Sensor.
6. Depress Test Switch again and the imbedded LED
will go out, indicating the PC210 is back to normal
operation and the Web Break Relay is operational.
CONDITION STATuS CORRECTIvE ACTION
45 o
No Web in Sensor
Normal
Abnormal
1. Is the Sensor installed
and aligned correctly?
2. Has dust accumulated inside
the Sensor tube?
(Clean the Sensor tube with an
air gun or remove the Sensor
tube for cleaning.)
Normal
Abnormal
Set the Web Thickness Selector
Switch LEFT 0.002 - 0.008 In. [0.05
- 0.020 mm]. Single thickness of Web in Sensor
TABLE 5 WEB BREAk OPERATION
None
None
CALIBRATION
This potentiometer adjusts PC210 sensitivity to splices.
It has no effect in Sheet-Fed Mode 7.
The Web Splice Sensitivity Control is normally set to
Position 3. In rare cases where the thickness of the
splice is not twice the thickness of the web (as a butt
splice made with single sided taping and very thin tape),
it may be necessary to increase sensitivity (See Figure 6).
The sensitivity should be increased slowly from 3 - 3.5 or
even 4.
NOTE: An increase in sensitivity will also increase the
possibility of false triggering. Increase sensitivity slowly
and only as much as necessary.
Web Splice
Sensitivity Control
FIGuRE 7
WEB SPLICE SENSITIvITY CONTROL
(See Figure 7)
OPERATION (continued...)
(continued...)