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Siemens AG
文档类型 常问问题 文档编号 109765694, 文档发布日期 2019年3月19日
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Two KNX power supplies directly in parallel

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Question:

Can two or more KNX power supplies be operated directly in parallel without a minimum cable length?

 

Answer:

Two KNX power supplies N 125/x2 of the same type (same current) can be operated directly in parallel without observing a minimum cable length.  It is also possible to extend a TP line, which is supplied by a central KNX power supply N125/x2, with a decentralized KNX power supply RL 125/23. Alternatively, a TP line can be supplied of up to eight decentralized KNX power supplies RL 125/23 can be supplied. However, the combination with a central KNX power supply at the same time is not permitted.

 

Hint:

If two power supply units N 125/x2 are operated in parallel on one bus line and if the overload LED is lit on one or both power supplies, then the bus configuration has to be changed until the overload display disappears. The cable length between the two power supply units N 125/x2 operated in parallel is not prescribed.

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