ENG_205217.XML
Add-on modules for increasing system availability
A power supply unit on its own cannot guarantee fault-free 24 V supply. Power failures, extreme line voltage fluctuations, or a faulty load can disrupt plant operation and result in high costs. The add-on modules offer everything from extensive protection against interference on the primary and secondary side right up to complete all-round protection.
Redundancy modules – for doubling system availability
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SITOP redundancy modules
The redundancy module decouples two power supplies of the same type so that the loads are still supplied by the second power supply (1 + 1 redundancy) in case one of the two power supplies fails.
Redundancy modules support parallel connected power supplies of the same type to increase power while offering redundancy at the same time (N + 1 redundancy).
You can use the redundancy module NEC Class 2 to implement a redundant 24 V supply limited to an output power of 100 VA.
Selectivity modules – for protection of 24 V and 48 V feeders
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SITOP selectivity modules
The selectivity module is used in conjunction with 24 V and 48 V power supplies to distribute the load current over multiple feeders and to monitor the individual partial currents. Faults caused by overload or short-circuits in individual branches are detected and selectively switched off so that the remaining load current paths remain unaffected. This achieves fast fault diagnostics and minimizes downtimes.
Buffer module – bridging power failures for as long as seconds
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SITOP buffer modules
Power failures normally only last for fractions of a second, but they can still cause costly and time-consuming damage in sensitive production areas. In combination with SITOP 24 V power supply units, the buffer module bridges short voltage dips of this type with its electrolytic capacitors and ensures uninterrupted operation.
Inrush current limiter – for protection of downstream power supplies against excessively high inrush currents
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SITOP inrush current limiters are used to reliably reduce the starting currents that are caused, for example, by transformers or with pulse-controlled power supplies by the rectifier circuit on the input side with capacitor charging.
However, they can also be used as a fuse for relay outputs downstream from the power supply in order to ensure the functionality of these relay modules when high inrush currents are connected to these loads.
