Single Inverter; Operation In Parallel; Can-Bus Addressing - Eltek Valere UNV-F 2.5 User Manual

DC/AC Inverter
UNV-F
User Manual
Page 13 (28)
For the electrical connection of DC input and AC output the backside panel connector is to be used. The DC
input is protected against wrong polarity (unit does not switch on). The UNV-F with output power of 2.5 and
3.3kVA are fitted with an output side MCB fusing at the front panel combined with an input side MCB, whereas
the 5kVA version is fitted with a mechanical switch. That means that the 5kVA version must be fused with
external fuses.
If the UNV-F works in combination with a static bypass switch (UNB) the CAN-Bus cable must be connected to
one of the CAN-Bus connectors at the front of the unit.
Please check the load power before the module is connected.
A permanent overload is not allowed and decreases the inverters lifetime. Especially the inrush currents of
loads have to be observed (e.g. the inrush current of an usual computer monitor can be more than
50A).
The connection of a non-fused protective earth conductor is required. The electrical connections have to be
done according to the pin list in section 3.3. Please use wires acc. to VDE 0100 or equal standard. To decrease
voltage losses on cables the usage of bigger sizes of wire as specified is recommended. For instance, a high
voltage loss on battery wires can decrease the backup time.
The following commissioning rules should be observed:

4.2.1 Single inverter


check the system wiring (polarity of DC- supply line)

check that the inverter is switched off

connect DC input with open DC busbar fuses

connect AC loads

close the DC busbar fuses

switch on the unit by front side MCB actuation

switch on the load

4.2.2 Operation in parallel


Before commissioning paralleled units make sure that the output voltage and frequency matches.

check the system wiring (polarity of DC- supply line, synchronous bus)

check that the inverters are switched off

connect DC input with open DC busbar fuses

check the wiring between inverters (synchronization wires)

connect AC loads

close DC busbar fuses

switch on the units by front side MCB actuation

switch on the load
Note: The unit which transmits the synchonization signal to the synchronization bus at first will be the master.
If this master unit is disturbed or switched off, another unit overtakes the master function. In systems with a
static transfer switch (UNB) the inverters are synchronized by the UNB unit.
The inverter output relay switches the inverter output to the AC busbar if the internal voltage is okay and the
output voltage is within the correct range. In this way defective modules switch off themselves and are
disconnected from the AC bus automatically.

4.2.3 CAN-Bus Addressing

If paralleled inverters work in combination with a static transfer switch (UNB), the respective inverters within
the system must be addressed for a clear identification via the CAN-Bus. The specific address per inverter
(module) must be allocated with the adjustment keys in the "basic menu PM1" (please see the section 4.5. and
the following).
The standard address (factory set) of the inverter is "001".
©2009. ELTEK VALERE DEUTSCHLAND GmbH. UM_UNVF_ E_R2.0