Installation and operating instructions V00 29
5.4.4 Residual current protection
The inverter is equipped with a residual current monitoring unit (RCMU) comprising a
differential current sensor and relevant detecting circuits, which fulfills the
requirements of DIN VDE 0100-712 (IEC60364-7-712:2002).
Therefore an external residual current device (RCD) is not required. If an external RCD
needs to be installed because of local regulations, an RCD
type A or type B can be
installed as an additional safety measure.
The residual current monitoring unit (RCMU) integrated in the inverter detects both AC
& DC currents. The function of the residual current monitoring unit (RCMU) has been
tested in accordance with IEC 62109-2.
5.4.5 Overvoltage category
The inverter can be deployed in grids of overvoltage category III or lower, as defined
under IEC 60664-1. This means that it can be directly connected to the grid-connection
point in a building. In installations involving long outdoor cable routing, additional
overvoltage-reducing measures must be taken so that the grid overvoltage category
at the connecting point is reduced from category IV to III.
Refer to the following information in case an external RCD is needed!
•
If an external residual current device (RCD)
is required in a TT or TN-S system,
install a residual current device which activates at a residual current of
200mA or higher.
•
For each connected inverter, a rated residual current of 200mA has to be
provided. The rated residual current of the RCD must be equal to at least the
sum of the rated residual currents of the connected inverters. That means
that, if, for example, two transformerless inverters are connected, the rated
residual current of the RCD must be at least 400mA.
Summary of Contents for Zeverlution Pro 33K.
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