U15 - What does this fault indication mean?

Question:

What does the fault indication U15 mean in case of 9300 controllers?

Answer:

The control voltage, which is supposed to be 24 V DC, has fallen below a threshold value (ca. 18 V). The message is activated for only some milliseconds, as a further decrease of the voltage cannot guarantee a supply of the control board. It is, however, possible that a superimposed control detects and stores this short fault indication.

The fault code U15-TRIP has fault number 70.

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AKB-ID: 20023204
Last update: 2024/01/11
Category: FAQ, Tips and Tricks

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