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"UniVert 2" inverter
Page 11 of 42 8000012364 BAL, en
Individual INV operation:
Here an INV is supplied with DC and itself supplies the AC load. In
the event of INV fault or switch-off, the load is no longer supplied.
Parallel INV operation:
In order to increase redundancy or performance, up to 8 INVs of the
same type and the same output can be connected in parallel. Note
that if one or several of the INVs fail, the remaining INVs take over
the load. Overload of the remaining INVs can be prevented by
choosing the right number of redundant INVs. If the number of INVs
that fail or are switched off exceeds the number of available
redundant INVs, the remaining INVs switch off together.
When the INVs are switched back on by connecting the DC, they do
not switch on their output contactors at the same time until a sufficient
number of INVs (in accordance with the redundancy setting) are
available to take over the load.
INVs for parallel operation need a choke between INV output and
busbar.
Individual or parallel operation with SBS:
If one or more INVs are combined with an SPS, switchover of the
loads from the mains to the INV and vice versa is possible without
any interruption. With parallel operation systems, the load is
distributed to the remaining INVs if one or several INVs fail. The
system may switch over to the mains when a voltage drop occurs on
the load busbar as a result of the failure of one INV, or if the number
of INVs still operating is insufficient (redundancy setting). In order to
switch the load back from the mains to the INVs, n-R INVs must be in
operation (where R = redundant INVs).
2.2 Function of the System
Individual INV operation:
The INV as an individual unit supplies the loads. If it is switched off or
disturbed, either by internal faults of the INV or by failure of the
DC supply or by a DC voltage deviation, the AC loads are no longer
supplied. The INV is not synchronised with the mains or other
AC voltage sources. The INV can be connected to the DC voltage
using a switching device on the input (miniature circuit-breaker,
contactor). An internal softstart device limits the current to values
below the rated current. If the INV is switched to the DC, the control
unit starts operating. The INV supplies the output voltage if the unit is
additionally switched on using the ON/OFF switch. If the supplying
mains fails, the battery of the power supply system is discharged
(also) by the INV. When the DC undervoltage monitoring value is
reached, the INV is switched off. If the battery is charged after the
mains voltage has returned, the INV is automatically started when a
limit value of the DC undervoltage monitoring is exceeded.