CHARACTERISTICS
57
NV021 - Manual - 08 - 2012
Logical block (Block1)
If the
f>BLK1
and/or
f>>BLK1
enabling parameters are set to
ON
and a binary input is designed
for logical block (Block1), the protection is blocked off whenever the given input is active.
The trip timer is held in reset condition, so the operate time counting starts when the input block goes
down.
[1]
The enabling parameters are available inside the
Set \ Profi le A(or B) \ Overfrequency - 81O
\
f> Element
(
f>> Element) \ Setpoints
menus, while the
Block1
function must be assigned to the
selected binary input inside the
Set \ Inputs \ Binary input IN1(x2)
menus (IN1 or INx matching).
Note 1 The exhaustive treatment of the logical block (Block 1) function may be found in the “Logic Block” paragraph inside
CONTROL AND MONITOR-
ING
section.
Fun-F81O_S1.ai
f
> inhibition
(ON
≡
Inhibit)
&
RESET
t
f>def
0
T
TRIP
P
ING
M
A
TRIX
(
L
E
D
+
R
E
L
A
YS
)
t
f>def
f
> Start
f
> Start
f
> Trip
f
> Trip
f
> Trip
BF Enable (ON
≡
Enable)
f>BF
towards BF logic
&
f
> Block1
f
> BF
&
&
&
Enable (ON
≡
Enable)
Block1 input (ON
≡
Block)
Block1
Block1
f
≥
f
>>
def
f
>
def
f
U
L1
,
U
L2
,
U
L3
M a x
(
U
L1...
U
L3
) ≥ 2 0 %
U
n
Binary input INx
T
0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T
0
n.o.
n.c.
INx
t
OFF
f
>ST-K
f
>ST-L
f
>TR-K
f
>TR-L
f>BLK1
Logic diagram concerning the first threshold (f>) of the overfrequency element - 81O
Fun-F81O_S2.ai
&
RESET
t
f>>def
0
T
TRIP
P
ING
M
A
TRIX
(
L
E
D
+
R
E
L
A
YS
)
t
f>>def
f
>> Start
f
>> Trip
f
> Trip
f
>> Trip
BF Enable (ON
≡
Enable)
f>>BF
towards BF logic
&
f
> Block1
f
>> BF
&
&
&
Enable (ON
≡
Enable)
Block1 input (ON
≡
Block)
Block1
Block1
f
≥
f
>>
def
f
>>
def
f
U
L1...
U
L3
M a x
(
U
L1...
U
L3
) ≥ 2 0 %
U
n
Binary input INx
T
0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T
0
n.o.
n.c.
INx
t
OFF
f
>>ST-K
f
>>ST-L
f
>>TR-K
f
>>TR-L
f
>> Start
&
(ON
≡
Inhibit)
f
> inhibition
f>disbyf>>
f>>BLK1
Logic diagram concerning the second threshold (f>>) of the overfrequency element - 81O