Wintriss Shadow 8, User Manual

Page: 91 / 159

1139300 Shadow 8 User Manual
3-6 Operation
In order to prevent vibration from activating the light curtain unnecessarily, Shadow 8 has
been designed to allow some flexibility in the area covered by programmable fixed blanking
windows. Each fixed blanking window has a positional tolerance of ± 1 beam, allowing the
object to move up or down by 1 beam without causing a Curtains Obstructed operating state.
As a result, when determining the safety distance for a fixed blanking window, you must
include an additional beam in your calculations. See Increasing Safety Distance To
Compensate for Blanking Windows, page 2-10.
If you program two fixed blanking windows on the same head, there must be a minimum of
two unblanked beams between the blanked areas to allow vibration in either blanked object.
In other words, if there is only one unblanked beam between two fixed blanking windows,
that beam must remain unobstructed all the time.
Fixed blanking is enabled via option switches SWA 5 and SWB 5 on the Main Receiver (see
Figure 2-24, page 2-46 and Enabling Programmable Fixed Blanking (Receiver Switch 5),
page 2-48). “Fixed Blanking Enabled” is the default setting. When fixed blanking is enabled,
the amber Blanking Active LED on the Main Receiver becomes illuminated.
A fixed blanking window is programmed using the Program Off/On and Program/Run/Start
key switches on the optional Shadow 8 control or WPC front panel.
To program a fixed blanking window, do the following:
1.
With Shadow 8 in the Curtains Unobstructed state (i.e., Machine Run/Stop LED indicator
is illuminated green), place the object (e.g., conveyor, table, etc.) between the receiver and
transmitter.
Shadow 8 enters a Curtains Obstructed state (i.e., Machine Run/Stop LED indicator is lit
red). The red Individual Beam Indicator LEDs next to the beams on the receiver that are
blocked by the object are lit, and the amber Blanking Active LED continues to be
illuminated.
2.
Perform the following steps in quick succession:
a. Turn the Program Off/On key switch to the ON position, and hold it there. The red
and amber LEDs and blanked IBIs remain lit.
b. Turn the Program/Run/Start key switch to the PROG position, then release the switch.
The red and amber LEDs and blanked IBIs begin flashing.
Table 3-1. Consecutive Beam Requirement for Programmable Blanking
Main Heads Shadow 8 Model
Required No. of Consecutive
Beams Unobstructed
12.8 in. (320 mm) 7
17.5 in. (440 mm) 7
23.8 in. (600 mm) 7
30.0 in. (760 mm) 8
36.3 in. (920 mm) 8
47.4 in. (1200 mm) 8
59.9 in. (1520 mm) 9
Extension Heads
All models
2