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Why does the DIM on an S811+ go dark during starting?

There are two (2) reasons the S811+ can "pull donw" a healthy 24 Vdc power supply.

1. if one or more of the internal bypass coils is shorted, the excessive current draw will often exceed the capability of the power supply.

2. There are several transistors on the the printed circuit board of the S811+ that, if shorted, also can create excessive current demand.