Logic Diagram; Undervoltage Protection - ABB REG650 Technical Manual

Section 8
Current protection
8.10.7.4
MaxPhCurr
StartCurr
Voltage
control or
restraint
feature
MinPh-PhVoltage
IEC10000214 V1 EN
Figure 128: Simplified internal logic diagram for overcurrent function
IEC10000213 V1 EN
Figure 129: Simplified internal logic diagram for undervoltage function
8.10.7.5
254

Logic diagram

a
a>b
b
X
MinPh-phVoltage
StartVolt
Operation_UV=On
BLKUV

Undervoltage protection

The undervoltage step simply compares the magnitude of the measured voltage
quantity with the set start level. The undervoltage step starts if the magnitude of the
measured voltage quantity is smaller than the set level.
DEF time
selected
Inverse
Inverse
time
selected
DEF time
selected
a
b>a
b
AND
1MRK 502 048-UEN A
TROC
OR
STOC
IEC10000214-1-en.vsd
TRUV
STUV
IEC10000213-1-en.vsd
Technical manual