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P/N 69761 rev. B
7
Banner Engineering Corp.
•
Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
PICO-GUARD Controller
Instruction Manual
Installation and Alignment
WARNING . . .
Read this Section
Carefully Before Installing the System
The user is responsible for satisfying all
local, state, and national laws, rules, codes,
or regulations relating to the installation and use of this
control system in any particular application.
Extreme care should be taken to meet all legal requirements
and follow all technical installation and maintenance
instructions contained in this manual.
The user has the sole responsibility to ensure that the PICO-
GUARD System is installed and interfaced to the guarded
machine by Qualified Persons in accordance with this
manual and applicable safety regulations.
Read Section 1.2 and all of Section 3 of this manual carefully
before installing the system.
Failure to follow these
instructions could result in serious bodily injury or death.
Before installing the PICO-GUARD System, read Sections 1.2
and 3 of this manual, as well as the Application and Design
Guide, and the data sheets for the optical elements to be used,
in their entirety. The PICO-GUARD System’s ability to perform
its safety guarding function depends upon the appropriateness
of the application and upon its proper mechanical and
electrical installation and interfacing to the guarded machine. If
all mounting, installation, interfacing, and checkout procedures
are not followed properly, the System cannot provide the
protection for which it was designed. Installation must be
performed by a Qualified Person, as defined in Section 3.2.
See Warning below.
3.1 Excess Gain
The PICO-GUARD System requires that light signals of
sufficient intensity be detected by the receiver circuit. The
amount of light that reaches the receiver that is in excess
of the minimum amount required to be detected is called
the “Excess Gain.” Excess gain values are used to predict
the reliability of an Optical Element operating in a known
environment.
The light signals are attenuated as they pass through the
fiber optic cable and optical elements. The amount of signal
attenuation in a given system is determined by the following
factors:
• The number and type of optical elements in the loop,
• The distance between, and alignment of, the optical elements,
• The length of the fiber optic cable,
• The number and degree of fiber bends, and
• The termination of the fiber optic cable (polished or cut).
To calculate or verify the amount of excess gain, see
“Excess Gain” in the
PICO-GUARD Application and Design
Guide
. See Section 5.3 in this manual for troubleshooting weak
signal (low excess gain) conditions.
3. Installation and Alignment