ABB REL650 series Technical Manual page 321

1MRK 506 335-UUS A
LOSS OF VOLTAGE CHECK FUNCTION
TEST
TEST-ACTIVE
BlockLOV = Yes
BLOCK
STUL1N
STUL2N
STUL3N
CBOPEN
BLKU
ANSI08000011 V3 EN
Figure 145: Simplified diagram of Loss of voltage check LOVPTUV (27)
Technical manual
&
>1
&
Latched
Enable
tBlock
>1
t
>1
Function Enable
&
only 1 or 2 phases are low for
at least 10 s (not three)
&
>1
tRestore
Set Enable
t
Line restored for
at least 3 s
Section 8
Voltage protection
START
tTrip tPulse
t
Reset Enable
&
>1
ANSI08000011=3=e
n=Original[1].vsd
TRIP
315