Stabilized power supply units

The 24 V power supply from the SITOP range are optimized for industrial use and operate on the switched-mode principle. Due to the precisely regulated output voltage, the devices are even suitable for the connection of sensitive sensors. Different versions are available depending on the output current and field of application.

In some cases, functional expansion is possible with add-on modules. For example, for back-up in the event of long supply system outages, DC UPS modules 6 A, 15 A and 40 A are available with external back-up by rechargeable batteries and maintenance-free SITOP UPS500 with capacitor technology. 48 V power supplies have been added to the SITOP product range.

The SITOP PSU400M power supply unit with 600 V DC input is suitable for use on frequency converters as an efficient DC/DC converter. It converts the DC link voltage to a stabilized 24 V DC thus allowing, for example, specific emergency retraction movements to be performed in the event of a mains failure. This is possible because the control system and the drive electronics continue to receive a power supply for as long as there is sufficient energy stored in the DC link.

The wide DC input range (200 V to 900 V DC) and the high efficiency level of up to 96 % ensure efficient use of the DC link energy. The compact, rail-mounted device is versatile in its application thanks to its high overload capability with 50 % extra power for 5 s/min, its comprehensive range of functions and its rugged construction. The selectable ON delay which ensures that the converter's DC link is not loaded immediately during starting is one of the features that makes it ideal for operation on SINAMICS frequency converters.