Omron F3SJ-A series User Manual page 58

System Configuration and Functions
Reference: Preventing light interference of muting sensor
When a photoelectric sensor is used as a muting sensor, light interference may cause a muting error of F3SJ.
Light interference may occur due to:
Reflected light
A1 B1 F3SJ
(1)
(1) Interference between muting sensors
• Use sensors with mutual interference prevention (such as retro-reflective E3Z-R
• Use laser-type sensors (such as laser-type E3Z-LR
• Take distance from a sensor causing the interference
• Displace beams for each other to prevent interference (change installation height or place them crosswise)
• Install a barrier
• Attach interference prevention filter (provided for E3Z series as accessories)
• Attach a slit to reduce light intensity (provided for E3Z series as accessories)
• Lower the sensitivity
• Reduce a distance between a workpiece and a muting sensor to prevent reflected light from a workpiece
(2) Interference to a muting sensor from F3SJ
• Configure an operating range of F3SJ by the setting tool
• Take distance (D) from a sensor causing the interference
• Displace beams for each other to prevent interference (change installation height or place them crosswise)
• Install a barrier
• Arrange sensors in alternation
• Lower the sensitivity
(3) Interference from a muting sensor to F3SJ
• Use a red LED type sensor (such as retro-reflective E3Z-R
• Use laser-type sensors (such as laser-type E3Z-LR
• Take distance (D) from a sensor causing the interference
• Displace beams for each other to prevent interference (change installation height or place them crosswise)
• Install a barrier
• Arrange sensors in alternation
• Attach a slit to reduce light intensity (provided for E3Z series as accessories)
Mutual interference between a muting sensor and F3SJ in (2) and (3) above can be prevented by
configuring D satisfying a formula shown below:
• If L = 0.2 to 3m
• If L = 3m or larger
L : Distance between an emitter and a receiver of F3SJ
D : Distance between a muting sensor and F3SJ
F3SJ-A
40
User's Manual
Direct light
A2 B2 A1 B1
Workpiece
(1)
D = 0.26m or larger
D = L x tan5° = L x 0.088m or larger
F3SJ A2 B2
Workpiece
(1)
(1)
series)
series)
series)
Light from other F3SJ
A1 B1 F3SJ A2 B2
Workpiece
(2)
(3)
D
series)