AEG 8000012364 BAL operating instructions Parallel INV operation

"UniVert 2" inverter

Parallel INV operation:

Prerequisite for parallel operation is that the INVs on the DC and AC side are connected in parallel, interconnected via CAN bus (16-pin, X7) and correctly addressed. The general behaviour of an individual INV is as described in the previous paragraph.

The loads are only supplied with voltage when n-R INVs are switched on. The K7 output contactors of the INVs switch on simultaneously. The load is distributed equally to all the INVs in operation. If an INV is switched off or becomes faulty, the remaining INVs supply the load. The INVs are not synchronised with the mains.

When the DC undervoltage monitoring value is reached, the INVs are switched off. If the battery is charged after the mains voltage has returned, the INVs are automatically started when a limit value of the DC undervoltage monitoring is exceeded. The K7 output contactors of the INVs are switched on when n-R INVs are in operation.

In order to be able to remove one INV from the interconnected system for maintenance or repair work, we recommend providing a DC and an AC fuse for each INV.

Individual or parallel operation with SBS:

Prerequisite for operation with SBS is that the INV and SBS are connected in parallel on the AC side, interconnected via

CAN bus (X7) and correctly addressed. The general behaviour of an individual INV is as described in the two previous paragraphs. Under normal conditions, the INVs are operating synchronously with the mains and supply the AC loads. In the event of a voltage drop on the load busbar caused by the short circuit of an AC load or the failure, switch-off or overload of the INVs, the thyristor contactor of the SBS is fired and the K7 output contactors of the INVs are switched off. The loads are supplied by the mains. When the required number of INVs is available again, the loads are switched back from the mains to the INVs without interruption. If the SBS is blocked, e.g. because of mains voltage deviations, it is not possible to switch from INV to mains or vice versa.

In order to be able to disconnect the SBS from the mains and the AC busbar for maintenance or repair work, we recommend providing an AC fuse for both sides and supply the loads via the manual bypass.