Fronius GEN24 Operating Instructions Manual page 23

Name
"Overfrequency"
"Underfrequency"
"Fast Overvoltage
Disconnect"
"Long Time Aver-
age Overvoltage
Limit"
"Unintentional Is-
landing Detec-
tion."
Frequency This chapter deals with the protection settings for overfrequencies and underfre-
quencies. Grid frequency limit values are defined for this purpose. These depend
on the country setup and can be adjusted as described below.
Each frequency limit value is defined by:
-
-
The protection time describes the duration for which the frequency may be out-
side the respective frequency limit value before the inverter switches off with an
error message. Two overfrequency and two underfrequency limit values can be
used. The "Inner Limits" (f< for underfrequency; f>for overfrequency) are those
limit values which are closer to the rated frequency than the "Outer Limits" (f<<
for underfrequency; f>> for overfrequency). For the sensible use of both ranges,
the respective "Inner Limit" must be linked to a larger time than the "Outer Lim-
it".
Description
Grid frequency exceeds an
overfrequency limit ("In-
ner, Outer or Alternative
Limit Overfrequency").
Grid frequency falls below
an underfrequency limit
("Inner, Outer or Alternat-
ive Limit Underfre-
quency").
Triggering of the fast surge
protection (> 135%).
Mains voltage exceeds the
long-term overvoltage lim-
it ("Long Time Average
Limit").
Unintentional islanding
was detected.
an underfrequency with associated protection time, or
an overfrequency with associated protection time.
"StateCode" "StateCode"
name number
"AC fre- 1035
quency too
high"
"AC fre- 1037
quency too
low"
"Grid voltage 1115, 1116
too high (fast
overvoltage
cut-out)"
"Long-term 1117
mains
voltage limit
exceeded"
"Islanding 1004
detected"
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