Operating instructions

17
UPS technologies
acc. to IEC 62040-3 (offline)
VFD
Advantages:
r most compact solutions possible
r high efficiency,
low running costs
r low cost solutions
Disadvantages:
r transfer gap (some ms)
r load is fed by unfiltered voltage
(no correction by the inverter)
r output voltage often not sinusoidal
acc. to IEC 62040-3 (line-interactive)
VI
Advantages:
r high efficiency
low running costs
r extremely wide input
voltage
r robust concept
Disadvantages:
r transfer gap (some ms)
AVR control rage/inverter transfer
r load is fed by unfiltered voltage
(no correction by the inverter)
acc. to IEC 62040-3 (online/double conversion)
VFI
Advantages:
r no transfer gap
r protection against all supply (mains)
voltage disturbances
r sine-wave input current
r
converter mode possible
r internal redundancy by addtional bypass
Disadvantages:
r lower efficiency in comparison to
VI technology
r more cost intensive comparison to
VFD technology
Mains Transfer unit
Rectifier Battery Inverter
Load
Mains
Rectifier Battery Inverter
Load
AVR
Transfer unit
Transformer
Mains
Load
SBS
Rectifier Inverter
Battery
UPS