Fronius GEN24 Operating Instructions Manual page 70

Parameter
"Time Constant
(τ)"
Q(U) - Voltage-dependent Reactive Power Characteristic
This function controls the reactive power as a function of the momentary mains
voltage according to a characteristic curve. The characteristic curve is defined by
four data points (1‑2‑3‑4). If fewer data points are required, the identical para-
meters can be set for two points. The function is limited by the maximum appar-
ent power and by "Cos φ Minimum". For the characteristic curves, the data points
in the X‑axis (voltage) and in the Y‑axis (reactive power) must be entered.
Point
1
2
3
70
Range of val- Description
ues
0.01 s ‑ 60 s
Time constant (1
Tau) in seconds [s].
Whenever the set
value is changed,
this new set value is
not triggered ab-
ruptly, but smoothly
in accordance with a
PT1 response. The
time constant de-
scribes how quickly
the new set value is
reached. (After three
time constants the
final value 95 % is
reached)
Parameter Range of val-
ues
50 % ‑ 150 %
"Voltage (% of
Nominal
Voltage)"
-100 % ‑ 100 %
"Reactive Power
(% of Nominal
Apparent
Power)"
50 % ‑ 150 %
"Voltage (% of
Nominal
Voltage)"
-100 % ‑ 100 %
"Reactive Power
(% of Nominal
Apparent
Power)"
50 % ‑ 150 %
"Voltage (% of
Nominal
Voltage)"
-100 % ‑ 100 %
"Reactive Power
(% of Nominal
Apparent
Power)"
Supplementary de-
scription
Description
AC voltage in percent [%] re-
lated to the nominal voltage
(X‑axis).
Reactive power in percent [%]
related to the nominal appar-
ent power S (Y‑axis).
n
AC voltage in percent [%] re-
lated to the nominal voltage
(X‑axis).
Reactive power in percent [%]
related to the nominal appar-
ent power S (Y‑axis).
n
AC voltage in percent [%] re-
lated to the nominal voltage
(X‑axis).
Reactive power in percent [%]
related to the nominal appar-
ent power S (Y‑axis).
n