ABB REB650 - Page 134

PICKUP
PU_ST1_A
PU_ST1_B
PU_ST1_C
T R S
T 1
PICKUP
P U
_ S T 2
T
R S T
2
TRIP
MinVoltSelector
Pickup
&
Trip
Output
Logic
Step 1
Pickup
&
Trip
Output
Logic
Step 2
Phase C
Phase B
Phase A
Phase C
Phase B
Phase A
Timer
t2
Voltage Phase
Selector
OpMode2
Time integrator
t1
Voltage Phase
Selector
OpMode1
1 out of 3
2 out of 3
3 out of 3
TRIP
TRIP
OR
OR
OR
OR
OR
OR
PICKUP
VA or VAB
VB or VBC
VC or VCA
Comparator
V < Pickup1
1 out of 3
2 out of 3
3 out of 3
P
U _ S T 1
ANSI08000016-2-en.vsd
Comparator
V < Pickup1
Comparator
V < Pickup1
Comparator
V < Pickup2
Comparator
V < Pickup2
Comparator
V < Pickup2
ANSI08000016 V2 EN
Figure 51: Schematic design of Two step undervoltage protection UV2PTUV (27)
Section 8 1MRK 505 277-UUS C
Voltage protection
128
Technical Manual