Banner EZ-SCREEN­ Safety Light Curtain Systems - Manual (Page 65)

P/N 133487
63
Banner Engineering Corp. • Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
Overview
63
Banner Engineering Corp. • Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
EZ-SCREEN
Instruction Manual
Cascadeable EZ-SCREEN
7.9 Positive-Opening Safety Interlock Switches
The Cascade input may be used to monitor interlock safety
gates or guards. Requirements vary widely for the level of
control reliability or safety category (per ISO 13849-1) in the
application of interlocked guards. While Banner Engineering
recommends the highest level of safety in any application, it
is the responsibility of the user to safely install, operate, and
maintain each safety system and comply with all relevant laws
and regulations. Of the following applications, Figure 7-9 meets
or exceeds the requirements for OSHA control reliability and
Safety Category 4, per ISO 13849-1.
The safety switches and actuators used with the Cascade must
be designed and installed so that they cannot be easily defeated.
They must be mounted securely, so that their physical position
can not shift, using reliable fasteners that require a tool to
remove. Mounting slots in the housings are for initial adjustment
only; final mounting holes must be used for permanent location.
Positive-Opening Interlocking Safety Switches
Two individually mounted safety interlock switches are
recommended for each guard to meet safety category 4, per ISO
13849-1, and must satisfy several requirements. Each switch
must provide at minimum, one normally closed (N/C) electrically
isolated contact to interface with the Cascade input (see Figure
7-9).
The contacts must be of “positive-opening” design, with one or
more normally closed contacts rated for safety. Positive-opening
operation causes the switch to be forced open, without the use of
springs, when the switch actuator is disengaged or moved from
its home position (see the Banner Safety Catalog for examples).
In addition, the switches must be mounted in a “positive mode”
to move/disengage the actuator from its home position and open
the normally closed contact when the guard opens.
Figure 7-9. Monitoring two positive-opening safety switches
WARNING . . .
Unguarded Moving Parts
It must not be possible for personnel to reach any hazard point
through an opened guard (or any opening) before hazardous
machine motion has completely stopped.
Please reference OSHA CFR1910.217, ANSI B11 standards, or
other appropriate standards for information on determining safety
distances and safe opening sizes for your application (see Inside
back cover).
Interlock Guarding Requirements
The following general requirements and considerations apply to
the installation of interlocked gates and guards for the purpose
of safeguarding. In addition, the user must refer to the relevant
regulations to be sure to comply with all necessary requirements.
Hazards guarded by the interlocked guard must be prevented
from operating until the guard is closed; a Stop command must
be issued to the guarded machine if the guard opens while the
hazard is present. Closing the guard must not, by itself, initiate
hazardous motion; a separate procedure must be required to
initiate the motion. The safety switches must not be used as a
mechanical or end-of-travel stop.
The guard must be located an adequate distance from the
danger zone (so the hazard has time to stop before the guard
is opened sufficiently to provide access to the hazard), and it
must open either laterally or away from the hazard, not into the
safeguarded area. Depending on the application, an interlocked
gate or door should not be able to close by itself and activate
the interlocking circuitry (ANSI/RIA R15.06). In addition, the
installation must prevent personnel from reaching over, under,
around, or through the guard to the hazard. Any openings in
the guard must not allow access to the hazard (see OSHA
29CFR1910.217 Table O-10 or the appropriate standard). The
guard must be strong enough and designed to protect personnel
and contain hazards within the guarded area, which may be
ejected, dropped, or emitted by the machine.
Wh
Open
Bk
Bn
QDE2R4-8..D Cable Pinout*
Pin #1 ― Brown (Ch 1a) Pin #5 ―n.c.
Pin #2 ― Black (Ch 1b) Pin #6 ―n.c.
Pin #3 ― Blue (Ch 2b) Pin #7 ―n.c.
Pin #4 ―n.c. Pin #8 ― White (Ch 2a)
* Standard M12 / Euro-style cables (8-pin male QD) can
also be used, although pin number / wire color must
be verified.
Bu
NOTE: This application is considered
to meet or exceed requirements
for OSHA control reliability
and safety categories 4 per
ISO 13849-1.