Why can a SEMG safety light grid not be put into operation even though the wiring is correct and a comparable device is working on the same connection? This question often arises if there is an invalid configuration on the device.
Typical indications of this are permanently lit LEDs such as DIAG4, DIAG1, ERROR, RES and OSSD off. In this state, the safety light grid deliberately prevents operation because safety-relevant settings have not been completed completely or correctly. Such a configuration error can occur if the emitter and receiver are not set up correctly during connection or parameterization. A fully completed configuration is also mandatory in the “Safety operating mode without contactor monitoring” mode.
A structured approach is recommended for rectification:
1. reset the emitter and receiver to the factory settings.
This removes incorrect or incomplete parameters.
2. select the desired configuration again.
It is important to complete the configuration so that the device recognizes the safe operating status.
3. check alignment
Incorrect alignment of the emitter and receiver is signaled via the LEDs on the receiver and should be corrected before completing the configuration.
In practice, the SEMG safety light grid can be put back into operation properly in most cases after these steps. The LED indicators do not indicate a defect, but rather a safety-related protective function of the device.
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