55
NC20 - Manual - 01 - 2015
FUNCTION CHARACTERISTICS
Fun-F37_S1.ai
Logic diagram concerning the first threshold (I<) of the undercurrent element - 37
RESET
t
<def
0
T
TR
IP
P
ING
M
A
TR
IX
(LED
+R
EL
A
Y
S
)
t
<def
Start I<
I<ST-K
Start I<
I<TR-K
I<ST-L
I<TR-L
Trip I<
Trip I<
BLK1I<
&
&
&
&
Enable (ON
≡
Enable)
Block1 input (ON
≡
Block)
I<BLK1
Block1
Block1
≥1
I
L1RMS
I
L2RMS
I
L3RMS
Binary input INx
T
0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T
0
n.o.
n.c.
INx
t
OFF
&
State
I
L1RMS
≤
I<
def
I
<
def
37 Inhibition
(ON
≡
Inhibit)
by MMI
Fun-F37_S2.ai
Logic diagram concerning the second threshold (I<<) of the undercurrent element - 37
RESET
t
<<
0
T
TRIP
P
ING
M
A
TRIX
(LED
+R
EL
A
Y
S
)
t
<<def
Start I<<
Start I<<
Trip I<<
Trip I<<
&
&
&
Enable (ON
≡
Enable)
Block1 input (ON
≡
Block)
Block1
Block1
Binary input INx
T
0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T
0
n.o.
n.c.
INx
t
OFF
I<<ST-K
I<<TR-K
U<<ST-L
I<<TR-L
BLK1I<
I<<BLK1
&
&
I
L1RMS
I
L2RMS
I
L3RMS
&
State
I
L1RMS
≤
I<
<
def
I
<<
def
37 Inhibition
(ON
≡
Inhibit)
by MMI