Uninterruptible Power Supply European Standard

VI (output Voltage Independant from mains supply): where the UPS output is dependent on supply (mains) frequency variations but supply voltage variations are conditioned by electronic active/passive voltage regulating devices within limits of normal operation (see section 5.3 as example of this configuration). installation.

The manufacturer's installation instructions and national wiring rules should be adhered to, if they conflict with the following information. Most UPS are designed primarily for use on single phase/three phase power systems with an earthed neutral.

This solution is especially used in security systems, but also in telecommunications equipment and the supply of relays or contactors. This supply comprises a rectifier and an energy storage unit: capacitors for back-up of less than 1 second, sets of batteries for greater back-up times.

There are different variations of rotary uninterruptible power systems, but all of them use motor-generator sets with the generator output going to the critical load. One version combines a motor and a generator with a highly simplified static inverter.

This supply comprises a rectifier and an energy storage unit: capacitors for back-up of less than 1 second, sets of batteries for greater back-up times. This system is simple and cost effective, but it requires a device with a permanent direct current supply of a voltage of between 12 and 220V.

Most UPS are designed primarily for use on single phase/three phase power systems with an earthed neutral. For use on other power systems, i.e. impedant neutral or for single phase UPS for line to line operation, refer to the manufacturer or supplier for guidance on power system compatibility.