Periodic checkout procedures, Warning – Banner EZ-SCREEN Safety Light Curtain Systems User Manual
Page 52
page
52
Banner Engineering Corp.
•
Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
Periodic Checkout Procedures
EZ-SCREEN Grid
Instruction Manual
If mirrors are used in the application: Test the grid at three points on each
leg of the beam path (emitter to mirror, between mirror and receiver). See
Figure 6-2.
Verify that the appropriate Beam Status indicator turns Green when the
blockage is removed from each beam.
NOTE: When blocking the first beam, all other beam indicators will be OFF,
because the first beam provides the synchronization signal for all the
beams.
If the appropriate Beam Status indicator remains steady Green or flickers
while the test piece is blocking the beam, check for the presence of reflective
surfaces; see Section 3.3.4. Do not continue or operate the guarded
machine until the situation is corrected and the indicator turns steady Red
whenever the test piece is in the beam path.
To eliminate the problem reflections:
•
If possible, relocate the sensors to move the light grid beams away from the
reflective surface(s), being careful to maintain adequate separation distance.
•
Otherwise, if possible, paint, mask or roughen the surface to reduce the
reflectivity.
•
Where these are not possible (as with a shiny workpiece), include a means
of restricting the receiver’s field of view or the emitter’s spread of light in the
sensor mounting.
•
Repeat the trip test to verify that these changes have eliminated the problem
reflection(s). If the workpiece is especially reflective and comes close to the
light grid, perform the trip test with the workpiece in place.
When the test piece is removed,
verify that the all of the Beam
Status indicators on the receiver
are steady Green. If any indicator
is flickering, the signal is weak;
first clean the lenses. If this does
not correct the problem, realign
the sensors as needed (see
Section 3.6). If the System is
operating in Latch Output mode,
perform a manual receiver reset.
Verify that the receiver Status
indicator is steady Green.
Do not continue operation until
the entire checkout procedure
is complete and all problems
are corrected.
WARNING . . .
If Trip Test Indicates a
Problem
If the EZ-SCREEN Grid System
does not respond properly to the
Trip Test, do not attempt to use the
System. If this occurs, the System
cannot be relied upon to stop
dangerous machine motion when a
person or object enters the light
grid.
Serious bodily injury or death
could result.
!
1
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Figure 6-2. EZ-SCREEN Grid trip test with corner mirrors
Emitter
Receiver
Mirror #1