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Installation and Operating Instructions
V02
5.4.4 Residual current protection
The inverter is equipped with an all-pole sensitive residual current monitoring unit
(RCMU) with an integrated differential current sensor 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, a RCD type A or type B can be
installed as an additional safety measure.
The all-pole sensitive residual current monitoring unit (RCMU) detects alternating and
direct differential currents. The integrated differential current sensor detects the
current difference between the neutral conductor and the line conductor. If the
current difference increases suddenly, the inverter disconnects from the grid. The
function of the all-pole sensitive residual current monitoring unit (RCMU) has been
tested in accordance with IEC 62109-2.
Tip about the
external residual current device (RCD)
Where an external residual current device (RCD) is required in a TT or
TN-S system, install a residual current device which trips at a residual
current of 100mA or higher.
For each connected inverter, a rated residual current of 100mA 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
inverter.That means that, if, for example, 2 transformerless inverters
are connected, the rated residual current of the RCD must be at least
200mA.
Summary of Contents for Zeverlution 1000S
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