85
NC20 - Manual - 01 - 2015
FUNCTION CHARACTERISTICS
Fun_50-51AL.ai
I
L 1RMS
I
L 2RMS
I
L 3RMS
R E S E T
t
>AL
0
T
≥
1
≥
1
Start I>AL
Trip I>AL
CB-State
ON
≡
Inhibit (from I>, I>> and/or I>>> overcurrent element)
ON
≡
Enable I>AL overcurrent element
(Pickup within CLP)
(Pickup outside CLP)
I>AL inhibition
&
T
0
t
CLP>AL
ICLP>ALMode
I
C L P >ALdef
t
CLP>AL
TRIP
P
ING
M
A
TRIX
(LED
+R
EL
A
Y
S
)
A
B
C
A =“1”
A =“0 or OFF”
Output
t
CLP>AL
I>AL Enable
t
CLP>
CB State
CB OPEN
CB CLOSED
CB OPEN
Output t
CLP>
t
0.1 s
HIGH THRESHOLD/
BLOCK
LOW THRESHOLD/
UNBLOCK
HIGH THRESHOLD/
BLOCK
A = ON - Change setting
B = OFF
C = ON - Element blocking
I>ALTR-K
I>ALTR-L
I>ALST-L
I>ALST-K
≥
1
CLP I>AL
I
L 1RMS
≥
I
>
ALdef
I
>
ALdef
I
L 1RMS
≥
I
C L P >ALdef
t
>ALdef
Phase overcurrent (50/51 RMS) - Alarm element logic diagram (I>
AL
)
Binary input INx
T
0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T
0
n.o.
n.c.
INx
t
OFF
BLK1I>Al
&
&
&
Enable (ON
≡
Enable)
I>ALBLK1
Block1
Start
I>
AL
Trip
I>
AL
Block1
Block1