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cutoff threshold, which is dependent on
the performance class. The NT 2600 model
is switched off at an absolute residual cur-
rent of 130 mA, the NT 4000 model at an
absolute residual current of 200 mA and
the NT 6000 model at an absolute residual
current of 300 mA. The AFI triggers within
< 0.2 seconds.
· MPP control
The solar inverter has a rapid MPP control,
which maintains the MPP point with a very
high adaptation efficiency. If surplus power
is provided by the PV generator, the solar
inverter limits this by shifting the working
point of the characteristic curve of the PV
generator, so as not to exceed the maxi-
mum permissible AC feed-in power in
accordance with VDEW.