Fronius IG 300 Bedienungsanleitung Seite 184

Change gradient:
Reserved data must always be 0x00.
Response:
Start Length
Remote Ctrl Data
-
-
-
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
-
-
-
-
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.
182
Device / Op-
tion
variable 0x00
Inverter number
The Q specified value indicates the reactive power available from the inverter while
rel
feeding energy into the grid as a relative value in relation to the maximum possible re-
active power.
A Q specified value of 0% means live operation while feeding energy into the grid
rel
(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
rel
be used to avoid erratic changes between entered values.
specified value defines whether the inverter behaves like an over- or
rel
specified value
rel
S = 4000 VA
max
Cos phi = 0.75
max
Phi = 41.4096°
max
Q (125%) = S x sin(Phi
max max
big endian | unsigned char | resolution: 1 LsB = Delta 1 [%] /
sec |
Value range limitation for Fronius IG Plus, Fronius CL: 1-
200d / Special value: 0xFF is defined as "as fast as possible"
Value range limitation for Fronius Agilo: 1-100d / Special val-
ue: 0xFF is defined as "as fast as possible"
Example: Change from -50 % to +50 % corresponds to a Del-
ta of 100. A change gradient of 200 entails a change from -50
% to +50 % in 0.5 seconds (calculation: Delta/Change gradi-
ent = 100/200 = 0.5 seconds)
Number Com-
mand
0x00 0x9F 0x06
Check-
specified value. The change gradient can
rel
Meaning
under-excited
over-excited
) = 4000 x sin(41.4096) = 4000 x 0.6614 = 2645 var
max
Remote Ctrl Separator
CMD ID
0x7F
sum
):
max