3. Verify that the safety distance (minimum distance) from the closest danger point of the guarded machine to the
defined area is not less than the calculated distance, per
Calculating the Safety Distance (Minimum Distance)
on
page 15.
4. Verify that:
a) Access to any dangerous parts of the guarded machine is not possible from any direction not protected by the
S4B System, hard (fixed) guarding, or supplemental safeguarding, and
b) It is not possible for a person to stand between the defined area and the dangerous parts of the machine, or
c) Supplemental safeguarding and hard (fixed) guarding, as described by the appropriate safety standards, are in
place and functioning properly in any space (between the defined area and any hazard) which is large enough to
allow a person to stand undetected by the S4B.
5. If used, verify that all reset switches are mounted outside and in full view of the guarded area, out of reach of anyone
inside the guarded area, and that means of preventing inadvertent use is in place.
6. Examine the electrical wiring connections between the S4B OSSD outputs and the guarded machine’s control
elements to verify that the wiring meets the requirements stated in
Electrical Connections to the Guarded Machine
page 34.
7. Inspect the area near the defined area (including work pieces and the guarded machine) for reflective surfaces (see
on page 20). Remove the reflective surfaces, if possible, by relocating them, painting,
masking or roughening them. Remaining problem reflections will become apparent during the Trip Test.
8. Verify that power to the guarded machine is off. Remove all obstructions from the defined area. Apply power to the
S4B System.
9. Observe the Status indicators and Diagnostic Display:
•
Lockout:
Red Status flashing; all others off
•
Blocked:
Red Status on; one or more red Zone indicators on
•
Clear:
Green Status on; all green Zone indicators on
10. A Blocked condition indicates that one or more of the beams is misaligned or interrupted. See
on page 31 to correct this situation.
11. After the green Status indicator is on, perform the trip test (
on page 32) on each sensing field to
verify proper System operation and to detect possible optical short circuits or reflection problems.
Do not continue
until the S4B passes the trip test.
Important: Do not expose any individual to any hazard during the following checks.
WARNING:
•
Clear the guarded area before applying power or resetting the system
•
Failure to clear the guarded area before applying power could result in serious injury or
death.
•
Verify that the guarded area is clear of personnel and any unwanted materials before
applying power to the guarded machine or before resetting the system.
12. Apply power to the guarded machine and verify that the machine does not start up.
13. Interrupt (block) the defined area with the test piece and verify it is not possible for the guarded machine to be put into
motion while the beam(s) is blocked.
14. Initiate machine motion of the guarded machine and, while it is moving, use the test piece to block the defined area.
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 must come to a stop with no apparent delay.
15. Remove 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.
16. Remove electrical power to the S4B. Both OSSD outputs should immediately turn Off, and the machine must not be
capable of starting until power is re-applied to the S4B.
17. 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.
Do not continue operation until the entire checkout procedure is complete and all problems are corrected.
S4B Safety Light Curtain
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37
