Expansion modules for increasing system availability

A power supply unit on its own cannot guarantee fault-free 24 V supply. Power failures, extreme variations in the mains voltage, or a faulty load can bring plant operation to a standstill and cause 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

SITOP redundancy module

Advantages of the redundancy modules

• High availability of the 24 V supply thanks to redundant configuration
• Power is reliably supplied even when a power supply fails
• Compact redundancy modules for power supplies up to 40 A
• Redundancy module 24 V/NEC Class 2 with limiting to 100 VA
• Diagnostic signal via LED and signaling contacts
• Adjustable switching threshold for LED and signaling contacts

Selectivity modules – for protection of 24 V feeds

SITOP selectivity module

Advantages of selectivity modules

• Reliable detection of overload or short-circuit in the 24 V circuit
• Reliable shutdown in case of overload regardless of cable lengths or cross-sections
• Four load feeders per module
• Versions with adjustable threshold from 0.5 to 3 A or 3 to 10 A
• Sequential connection of feeds is possible to reduce inrush current
• Diagnostics via group signaling contact or single-channel signaling
• Evaluation via free-of-charge SIMATIC S7 function blocks for modules with single-channel signaling

Buffer module – bridging power failures for as long as seconds

SITOP buffer module

Advantages of the buffer module

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 smart and SITOP modular power supply units, the buffer module bridges short voltage dips of this type with its electrolytic capacitors and ensures uninterrupted operation.