Thytronic NC20 - Page 55

55
NC2 0 - Manual - 01 - 2015
FUNCTION CHARACTERISTICS
Fun-F37_S1.ai
Logic diagram concerning the first threshold (I<) of the undercurrent element - 37
RESET
t
<def
0T
TRIPPING MATRIX (LED+RELAYS)
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
T0
Logic
INx t
ON
INx t
ON
INx t
OFF
T0
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
<<
0T
TRIPPING MATRIX (LED+RELAYS)
t
<<def
Start I<<
Start I<<
Trip I<<
Trip I<<
&
&
&
Enable (ON≡Enable)
Block1 input (ON≡Block)
Block1
Block1
Binary input INx
T0
Logic
INx t
ON
INx t
ON
INx t
OFF
T0
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