ABB REL650 series - Page 321

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