60
NV021 - Manual - 08 - 2012
CHARACTERISTICS
Fun-F81U_S2.ai
RESET
t
f<<
def
0
T
TRIP
P
ING
M
A
TRIX
(LED
+R
EL
A
Y
S
)
t
f<<
def
f
<< Start
f
<< Start
f
<< Trip
f
<< Trip
f
<< Trip
BF Enable (ON
≡
Enable)
towards BF logic
&
f
<< Block1
f
<< BF
&
&
&
Enable (ON
≡
Enable)
From 3rd and/or 4th element
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
&
(ON
≡
Inhibit)
f
< inhibition
f<disbyf<<
(ON
≡
Inhibit)
f<
< inhibition
&
f
≤
f
<<
def
f
<<
def
f
U
L1...
U
L3
M a x
(
U
L1...
U
L3
) ≥ 2 0 %
U
n
f<<BF
f
<<ST-K
f
<<ST-L
f
<<TR-K
f
<<TR-L
f<<BLK1
Logic diagram concerning the second threshold (f<<) of the underfrequency element - 81U
RESET
t
f
<<<
def
0
T
TR
IP
P
ING
M
A
TR
IX
(LED
+R
EL
A
Y
S
)
t
f
<<<
def
f
<<< Start
f
<<< Start
f
<<< Trip
f
<<< Trip
f
<<< Trip
BF Enable (ON
≡
Enable)
towards BF logic
&
f
<<< Block1
f
<<< BF
&
&
&
Enable (ON
≡
Enable)
From 4th element
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
&
(ON
≡
Inhibit)
f
<< inhibition
f<<disbyf<<<
&
(ON
≡
Inhibit)
f
< inhibition
f<disbyf<<<
(ON
≡
Inhibit)
f<
<< inhibition
&
f
≤
f
<<<
def
f
<<<
def
f
U
L1...
U
L3
M a x
(
U
L1...
U
L3
) ≥ 2 0 %
U
n
f<<<BF
Fun-F81U_S3.ai
f
<<<ST-K
f
<<<ST-L
f
<<<TR-K
f
<<<TR-L
f<<<BLK1
Logic diagram concerning the third threshold (f<<<) of the underfrequency element - 81U