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92
NC20 - Manual - 01 - 2015
FUNCTION CHARACTERISTICS
Fun_50-51FS2.ai
t
>>RES
T
0
R E S E T
t
>>def
0
T
≥
1
t
>>def
t
>>RES
Start I>>
Trip I>
>
CB-State
ON
≡
Inhibit (from I>>> overcurrent element)
ON
≡
Enable I>> overcurrent element
I
>
> inhibition
Block1, Block2
I>
>
TR-K
I>
>
TR-L
I>
>
ST-L
I>
>
ST-K
T
0
t
CLP>>
&
ICLP>>Mode
t
C L P >>
BF Enable (ON
≡
Enable)
I>>BF
towards BF logic
I>> BF
&
Trip I>>
TR
IP
P
ING
M
A
TR
IX
(LED
+R
EL
A
Y
S
)
A
B
C
Output
t
CLP>>
I
>>
Enable
I>> overcurrent element (50/51 Fundamental) Block diagram
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
&
(ON
≡
Inhibit)
Start I>>
I>AL inhibition
I>AL disbyl>>
≥
1
CLP I>>
&
(ON
≡
Inhibit)
Start I>>
I> inhibition
I> disbyl>>
I
L 1
I
L 2
≥
1
(Pickup within CLP)
(Pickup outside CLP)
I
C L P >>def
I
L 1
≥
I
C L P >>def
A =“1”
A =“0 or OFF”
I
L 3
&
State
I
L 1
≥
I
>>
def
I
>>
def
Phase overcurrent (50/51 Fundamental) - Second element logic diagram (I>>)