Eltek Valere UNV-F 2.5 Manual de usuario descargar pdf (Pagina 6)

Static Transfer Switch

UNB

User Manual

Page 6 (28)

2. General Information

An electronic transfer switch is to be used if critical consumer loads have to be switched over nearly interruption

free between two AC sources (usually inverters and substitute-mains) with a reaction time which is not able to be

reached with a manual (mechanical) bypass switch. The electronic transfer switch guarantees the synchronization

of frequency and phase of the inverter with mains and a switch over from the disturbed source to the alternative

source within 0.5 to 4.0ms depending on the adjusted sensitivity (factory setting, only adjustable by skilled service

personnel). Switching over again takes place interruption free at the zero point of the voltage. In case of synchro-

nization error between mains and inverters switching over takes place with a delay time of maximum 12ms.

Static transfer switches of series UNB are available for delivery with power rating of 5.0KVA to 40.0KVA and are to

be used for the operation with inverters of series UNV and PWS.

Typical applications are the use in UPS systems designed with input side rectifiers, battery circuit and output side

inverters.

The UNB is a 19’’-compatible rack according to DIN41494 with rear side connectors. The CAN bus connectors as

well as any operating elements and indicators are user-friendly integrated in the front plate of the unit.

2.1 Example of use

Static transfer switch UNB connected between inverter output side and mains 230VAC:

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Eltek Valere UNV-F 2.5 Manual de usuario Pagina 6