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How to troubleshoot a measuring light curtain that is not working?
Follow this systematic approach: Check power LED, verify alignment, clean optics, inspect cables, test individual beams, and verify communication parameters. Most issues are resolved by cleaning or realignment.
Troubleshooting Checklist
Check Power
Verify the power LED on both emitter and receiver. DADISICK DK-QL units have visible status indicators. No LED = no power — check 24VDC supply and wiring.
Inspect Alignment
Check if the emitter and receiver are parallel and facing each other. Even 1-2 degree misalignment can cause intermittent operation.
Clean Optical Surfaces
Dust, oil, or debris on the emitter or receiver windows is the most common cause of reduced performance. Clean with a soft, lint-free cloth and isopropyl alcohol.
Check Cables and Connectors
Verify the M12 connector is securely fastened. Check for damaged cables, bent pins, or corrosion.
Test Communication
Use a PC with serial terminal software to verify RS485/RS232 communication. Check baud rate, data bits, and device address settings.
If issues persist, contact DADISICK technical support for expert assistance. Do not disassemble the unit — it contains no user-serviceable internal components.