ZCVPSOF can be activated externally from input BC and thus setting AutoInit is
bypassed.
The function is released during a settable time tSOTF.
The function can be blocked by activating the input BLOCK.
AND
AND
BLOCK
AutiInit=Enabled
ZACC
OR
t
15
TRIP
ANSI09000398-2-en.vsd
UILevel detector
IA
IB
IC
VA
VB
VC
IphPickup
UVPickup
deadLine
AND
AND
OR
AND
OR
SOTFUILevel
BC
Mode = Impedance
Mode = VILevel
Mode = VILvl&Imp
t
t
t
tDLD
tSOFT
tDuration
ANSI09000398 V2 EN
Figure 87: Simplified logic diagram for Automatic switch onto fault logic, voltage and
current based.
Section 6 1MRK 506 335-UUS A
Impedance protection
186
Technical manual
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