Safety Circuit Fault — Light Curtain

Safety light curtain beam is interrupted or has alignment fault. Zone motion stopped.

Probable Causes (ranked)

• Object or person in light curtain beam path
• Light curtain lenses dirty — reduced beam strength causes fault
• Emitter and receiver misaligned — vibration shifted mounting
• Ambient light interference — direct sunlight hitting receiver
• Light curtain internal fault — LED segment failed

Fix Steps

1. 1 Clear beam path — remove any objects, verify no one is in the zone
2. 2 Clean light curtain lenses on both emitter and receiver with soft cloth
3. 3 Check alignment — most light curtains have alignment LEDs, all should be green
4. 4 If sunlight issue, add shielding or relocate to avoid direct sun exposure
5. 5 Check light curtain diagnostic display for specific segment fault
6. 6 Reset safety system and acknowledge at HMI after beam path is confirmed clear

Suggested Replacement Parts

Parts matched to fault category: Light Curtain

Prices are estimates. Verify part numbers match your equipment before ordering.

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