8.10.7.4
Logic diagram
PickupCurr
X
a
b
a>b
Voltage
control or
restraint
feature
Inverse
DEF time
selected
Inverse
time
selected
OR
ANSI10000214-2-en.vsd
PU_OC
TROC
MinPh-Ph Voltage
MaxPhCurr
0
0-tDef_OC
ANSI10000214 V2 EN
Figure 128:
Simplified internal logic diagram for overcurrent function
AND
a
b
b>a
MinPh-PhVoltage
BLKUV
ANSI10000213-2-en.vsd
DEF time
selected
PU_UV
TRUV
0
0-tDef_UV
PickupVolt
Operation_UV=Disabled
ANSI10000213 V2 EN
Figure 129:
Simplified internal logic diagram for undervoltage function
8.10.7.5
Undervoltage protection
The undervoltage step simply compares the magnitude of the measured voltage quantity
with the set pickup level. The undervoltage step picks up if the magnitude of the measured
voltage quantity is smaller than the set level.
1MRK 502 048-UUS A
Section 8
Current protection
279
Technical manual
Содержание 650 series
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