Fronius IG 300 Bedienungsanleitung Seite 186

Remote Ctrl Data
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The sign of the Q
under-excited synchronous machine. The inverter always acts like a generator regarding
the flow direction of the active energy:
Sign of Q
Negative
Positive
Example of the calculation of the maximum reactive power of an inverter with a power of
4 kW and a maximum reactive power range of 0.75 (cos phi
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The reactive power available for each feed-in operating point also depends on the present
effective power output due to the limited maximum cos phi.
For this reason, the reactive power specified value is only used as a maximum value when
sufficient effective power is being output and thus the power factor remains within the de-
fined limits.
184
Inverter number
The Q specified value indicates the reactive power provided by the inverter while
abs
feeding energy into the grid as an absolute value.
A Q specified value of 0 var means live operation while feeding energy into the grid
abs
(reactive components may occur due to the integrated EMI filter if filter compensation
is not activated).
The change gradient indicates the speed at which the inverter will change from the
present Q specified value to the new Q
abs
be used to avoid erratic changes between entered values.
specified value defines whether the inverter behaves like an over- or
abs
specified value
abs
S = 4000 VA
max
Cos phi = 0.75
max
Phi = 41.4096°
max
Q = S x sin(Phi
max max max
Check-
sum
specified value. The change gradient can
abs
Meaning
under-excited
over-excited
) = 4000 x sin(41.4096) = 4000 x 0.6614 = 2645 var
):
max