104
104
NC20 - Manual - 01 - 2015
FUNCTION CHARACTERISTICS
Fun_50N-51NS3.ai
t
E>>>RES
T
0
R E S E T
t
E>>>def
0
T
≥
1
t
E>>>def
t
E>>>RES
Start IE>>>
Trip IE>>
>
CB-State
ON
≡
Enable IE>>> residual overcurrent element
Block1, Block2
&
IE>>
>
TR-K
IE>>
>
TR-L
IE>>
>
ST-L
IE>>
>
ST-K
T
0
t
ECLP>>>
IECLP>>>Mode
t
EC L P >>>
BF Enable (ON
≡
Enable)
IE>>>BF
towards BF logic
IE>>> BF
&
Trip IE>>>
TRIP
P
ING
M
A
TRIX
(LED
+R
EL
A
Y
S
)
A
B
C
A = ON - Change setting
B = OFF
C = ON - Element blocking
Output
t
ECLP>>>
IE
>>>
Enable
IE>>> residual overcurrent element (50N/51N) Block diagram
t
ECLP>>>
CB State
CB OPEN
CB CLOSED
CB OPEN
Output t
ECLP
>>
>
t
0.1 s
HIGH THRESHOLD/
BLOCK
LOW THRESHOLD/
UNBLOCK
HIGH THRESHOLD/
BLOCK
&
(ON
≡
Inhibit)
Start IE>>>
Start IE>>>
Start IE>>>
(ON
≡
Inhibit)
IE> inhibition
IE>disbylE>>>
&
IE>> inhibition
IE>>disbylE>>>
≥
1
CLP IE>>>
I
E >>>def
A =“1”
A =“0 or OFF”
I
E
(Pickup within CLP)
(Pickup outside CLP)
I
EC L P >>>def
I
E
≥
I
E C L P
> > > d e f
&
State
I
E
≥
I
E
>>>
def
Residual overcurrent (50N/51N) - Third element logic diagram (IE>>>)