0X9F - Detailed Description And Example Of "Remote Ctrl Cmd Id" 0X04 - Fronius IG 300 Bedienungsanleitung

Remote Ctrl Data
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-
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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 0.85 (cos phi
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-
-
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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.
0x9F - Detailed
Query:
Description and
Start Length
Example of "Re-
mote Ctrl CMD ID"
0x04
Remote Ctrl Data
Values in the 'Remote Ctrl Data' byte:
Q
178
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 = 0.85
max
Phi = 31.7883°
max
Q (100%) = S x sin(Phi
max max
Device / Op-
tion
0x09 + 0x00
Num-
ber of
invert-
ers
specified value Separator
abs
0x7F
Inverter number
specified value. The change gradient can
rel
Meaning
over-excited
under-excited
) = 4000 x sin(31.7883) = 4000 x 0.5267 = 2100 var
max
Number Com-
mand
0x00 0x9F
Inverter number
Remote Ctrl Data
Change gradient
Check-
sum
):
max
Remote Ctrl Separator
CMD ID
0x04 0x7F
Check-
sum
Separator Reserved
0x7F 0x00