General Information; Typical Applications - Eltek Valere UNV-F 2.5 User Manual

DC/AC Inverter
UNV-F
User Manual
Page 6 (28)

2. General Information

Inverters of the series UNV-F convert input side DC voltage to a stable sinusoidal output voltage.
The inverters are available for delivery with an output power of 2.5, 3.3 and 5.0 kVA per module.
Several units can be switched in parallel operation to increase the system output power.
The UNV-F is a hot-pluggable module with rear side connectors. Only the communication wire (CAN-Bus) is
connected at the front. The inverters are controlled and monitored by an internal microprocessor. Due to the
outstanding switching principle the units have very low losses and therefore very compact dimensions, low
weight and a very high power density.
All main functional parameters are adjustable with front side operating keys and are indicated with digital
displays.
To increase the reliability the UNV-F inverter is designed to operate together with a static transfer switch of
series UNB. The static transfer switch monitors the connected bypass mains and synchronizes the inverter
output with mains frequency. In inverter priority mode the UNB transfers the load supply to bypass mains in
case of inverter faults, high overload or battery low voltage. The transfer is nearly without voltage interruption
(<4ms). The unit switches back to inverter operation automatically if the reason for the transfer is gone. In case
of mains priority mode the inverter will take over the load if the mains voltage is not present, out of limits or
heavy disturbed. The priority source is programmable at the UNB unit (see separate manual).

2.1 Typical Applications

(a) Inverter in parallel operation without UNB b) Inverter in parallel operation with UNB
©2009. ELTEK VALERE DEUTSCHLAND GmbH. UM_UNVF_ E_R2.0