Freedom of choice: UPS system with DC and AC voltage output

Many applications use direct current as the operating voltage. These include industrial control systems with 24V as well as the telecommunications sector, where 48V is usually used. 110V and 220V are also frequently found in the medium voltage range. The loads are protected by a UPS if they perform critical tasks. As a rule, a central battery system is responsible for this. But what if there are also some consumers such as PCs with classic 230V AC voltage? Until now, a separate UPS had to be procured, installed and monitored for this. With the Wöhrle combination system with plug-in modular rectifiers and inverters, such loads become part of the overall UPS system.

With the plug-in modular UPS system, customers can protect their DC loads as well as additional AC loads. The input voltage is 230V AC; rectifier modules convert it to the desired DC voltage of 24V, 48V, 110V or 220V. Depending on the module type and output voltage, the power per module is between 400 and 4,400 watts. The batteries are connected to the UPS via the DC voltage branch. Modular inverters use the DC voltage or the mains voltage as an input and use it to form 230 or 400 volts AC voltage for additional consumers. The customer determines how much power is available for the DC and AC voltage branches depending on requirements. Both branches are operated and managed via a common interface: either via the high-resolution 4.3" touch display on the 19" plug-in frame or via the CAN bus, USB or Ethernet interface. The control software controls the output voltage, charge retention voltage, high charge voltage with and without temperature compensation and all other parameters as well as the alarm.

The same industry-standard frame parameters apply to the DC and AC branches. The modules are hot-swappable during operation, resulting in a very short Mean-Time-To-Repair (MTTR). Redundant configurations with N+1 or N+N are supported. Use in the USA or other countries with a different power supply is also possible. There, for example, the modules can be supplied between two conductors with 208V AC and 60 Hz frequency. Each module is equipped with input and output fuses and is protected against overvoltage with a MOV that can be partially replaced in the field. If fans are used for cooling, these are regulated and replaceable in the field. An energy-saving mode helps to keep operating costs low while still ensuring high availability. The plug-in modular AC-DC/AC UPS system from Wöhrle therefore saves twice: because one UPS system is sufficient for both DC and AC loads and thanks to its high energy efficiency during operation.