Networking

Engineering and consultancy
Engineering and consultancy
UPS
1. VFD-UPS, old: Off-line (standby) UPS
Functional description:
In undisturbed operation, the current is
conveyed from the mains to the connected
devices (computers) by the UPS with no
voltage conversion. Parallel to this, the batteries
are charged via a rectifier. If voltage
fluctuations or power failures occur, the offline
UPS automatically switches to battery
mode, and from the energy in the batteries a
supply voltage is formed via the inverter. The
changeover to battery mode occurs within
approx. 2 – 4 ms, i.e. virtually without interruption.
Protection from:
● Power failure/mains failure
● Voltage drop/voltage dip
● Voltage surges
1
1 Mains
2 Rectifier
3 Inverter
4 Changeover switch
5 Battery
6 Equipment
2. VI-UPS, old: Line-interactive UPS (off-line UPS + AVR)
Functional description:
Unlike the off-line UPS the line-interactive
UPS offers a more stable output voltage,
thanks to the additional use of an AVR unit
(automatic voltage regulator).
Protection from:
● Power failure/mains failure
● Voltage drop/voltage dip
● Voltage surges
● Undervoltage
● Overvoltage
1
1 Mains
2 Rectifier
3 Inverter
4 Changeover switch
5 Battery
6 Equipment
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416 Rittal IT catalogue/Engineering/Consultancy
2
2
5
AVR
Application area:
● PCs and peripheral devices
● Emergency lights
● Small TC installations
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5
3
Normal operation
In case of mains failure
Application area:
● PCs and small servers
● Larger telecommunications systems
● Smaller server systems and networks
3
Normal operation
In case of mains failure
4
4
6
6