Fronius GEN24 Operating Instructions Manual page 43

Once the grid frequency falls within the permitted frequency range again follow-
ing successful power reduction, return to the full power available takes place de-
pending on the country setup as follows:
- Mode: "On (without Hysteresis)"
The inverter increases the power from the current reduced value to the ori-
ginal value in accordance with the same gradient used for power reduction.
- Mode: "On (with Hysteresis)"
The inverter will not increase the power to the original value until the fre-
quency is back in the target value range for a specific length of time.
Example 1
- "P(f) Mode": On (without
Hysteresis)
- "Configuration Method":
Gradient
- "Active Grid Support": Off
- "Calculation Mode Under-
frequency": P = P
max
P (k*df)
n
- "Calculation Mode Over-
frequency": P = P
max
P (k*df)
n
General power curve with overfrequency and underfrequency without hysteresis with gradients.
Description of the parameters
(1) Momentary effective power when the
respective "Activation Threshold" is
reached: 60 % of P
(2) "Gradient Underfrequency": 80 %/Hz -
Increase of output power without bat-
-
tery only possible if sufficient power
m
from PV generator is available and
manual power limitation is active. For
-
m this purpose, the "Priority at Under-
frequency" parameter must be set to
"Priority on Frequency-dependent
Power Limitation".
(3) "Activation Threshold Underfre-
quency": 49.7 Hz
(4) "Gradient Overfrequency": 60%/Hz
(5) "Activation Threshold Overfrequency":
50.3 Hz
(nominal power).
n
43