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76
NV10P - Manual - 01 - 2015
CHARACTERISTICS
Logic diagram concerning the fourth threshold (f<<<<) of the underfrequency element - 81U
RESET
t
f
<<<<
def
0
T
TRIP
P
ING
M
ATRIX
(
LE
D
+R
E
LA
YS
)
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)
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<disbyf<<<<
f
<<<<
def
f<<<<BF
Fun-F81U_S4.ai
f
<<<<ST-K
f
<<<<ST-L
f
<<<<TR-K
f
<<<<TR-L
f<<<<BLK1
&
f
<
f
<<<<
def
U
L1
,
U
L2
,
U
L3
M a x
(
U
L1...
U
L3
) ≥ 2 0 %
U
n
≥
1
( 1
≡
DDI closed)
DDI state
( 1
≡
upstream)
f<<<disbyCB_OPEN
M i n
(
f
UL1,
f
UL2,
f
UL3
)
f
UL1,
f
UL2,
f
UL3
