Banner EZ-SCREEN­ Safety Light Curtain Systems - Manual (Page 54)

page 54
Periodic Checkout Procedures
EZ-SCREEN Grid
Instruction Manual
8) Observe the receiver 7-segment display to verify that the system is set to the
desired operating mode (Trip Output - “–”; Latch - “L”).
Observe the status indicators on the receiver to determine light grid status:
A blocked condition is indicated by the Status indicator steady Red, and one
or more Beam Status indicator(s) steady Red.
NOTE: If beam 1 is blocked, all other beam indicators will be OFF, because
beam 1 provides the synchronization signal for all the beams.
A clear condition is indicated by all Beam Status indicators steady Green.
(Beam Status indicators will flicker Green if excess gain is marginal.)
A latch condition is indicated by the receiver Status indicator steady Red.
Beam Status indicators may be Red, Green, or flashing Green, depending on
the status of each beam. In Latch mode, the outputs come back ON only
when all beams are clear and after a manual reset.
A lockout condition is indicated by the Status indicator single-flashing Red,
and the Reset indicator OFF.
9) If in a clear condition, go to step 10. If in a lockout condition, refer to
Section 5. A blocked condition indicates that one or more of the beams is
misaligned or interrupted. To correct this situation:
a) Check carefully for any obstruction in the path of the beam(s).
b) Check for contamination. Clean the emitter and receiver windows as
required (see Section 5.4).
c) If the light grid is completely clear of obstructions, realign the emitter and
receiver, as described in Section 3.6.
If the system is in a latch condition, perform a manual reset.
10) Once the System Status indicator and all Beam Status indicators are steady
Green, perform the trip test (described in Section 6.2) to verify proper
system operation and to detect possible reflection problems.
11) Apply power to the guarded machine and verify that the machine does not
start up. Block one of the grid beams and verify that it is not possible for the
guarded machine to be put into motion while the beam is blocked.
12) Initiate machine motion of the guarded machine and, while it is moving, use
the supplied test piece to block one of the grid beams. Do not attempt to
insert the test piece into the dangerous parts of the machine. Upon blocking
any beam, the dangerous parts of the machine should come to a stop with
no apparent delay. Upon removal of the test piece from the beam, verify that
the machine does not automatically restart, and that the initiation devices
must be engaged to restart the machine.
13) Remove electrical power to the EZ-SCREEN Grid System. All OSSD outputs
should immediately turn OFF, and should not be capable of turning ON until
power is re-applied and, if in Latch Output mode, a manual reset is
performed (Trip Output mode requires no manual reset).
14) Test the machine stopping response time, using an instrument designed for
that purpose, to verify that it is the same or less than the overall system
response time specified by the machine manufacturer. (Banner’s Applications
Engineering Department can recommend a suitable instrument.)
Do not continue operation until the entire checkout procedure is complete and
all problems are corrected.
WARNING . . .
Do Not Use Machine
Until System Is
Working Properly
If all of these checks cannot be
verified, do not attempt to use the
EZ-SCREEN System/guarded
machine until the defect or problem
has been corrected (see Section 5).
Attempts to use the guarded
machine under such conditions
could result in serious bodily
injury or death.
!
WARNING . . .
Before Applying Power
to the Machine
Verify that the guarded area is
clear of personnel and unwanted
materials (such as tools) before
applying power to the guarded
machine.
Failure to do so could result in
serious bodily injury or death.
!
Banner Engineering Corp. • Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164