51
NC2 0 - Manual - 01 - 2015
FUNCTION CHARACTERISTICS
The fi rst threshold trip (U<) may be inhibited by start of the second threshold (U<<) by setting ON
the U< Disabling by U<< start (U<disbyU<<) parameter available inside the Set \ Profi le A(or B) \
Undervoltage-27 \ U<< Element \ Setpoints.
All undervoltage elements can produce the Breaker Failure output if the U< BF and U<< BF pa-
rameters are set to ON.
The parameters are available inside the Set\Profi le A(or B)\Undervoltage - 27 \ U< Element (U<<
Element) \Setpoints menus.
[1]
All the named parameters can be set separately for Profi le A and Profi le B (Set\Profi le A(or B)\Un-
dervoltage - 27 \ U< Element (U<< Element) \Setpoints menus).
Note 1 The common settings concerning the Breaker failure protection are adjustable inside the Breaker Failure - BF menu.
all-F27.ai
U
MMI
U<< Element
Disable 27 elements
Start U<<
Start U<< Start U<
Trip U<Trip U<<
&
≥
U< disbyU<<
U< inhibition
U<< inhibition
t
U<
def
t
U<
inv
U<
def
t
U<<
def
U<<
def
U<
inv
U< CurveU< EnableState
Block1
BLK1U<
&
U<BLK1
Start U<
&
Block1
BLK1U<<
&
U<<BLK1
Start U<<
&
U<BF
Trip U<
&
U<BF
U
AND
U
U
L1
,U
L2
,U
L3
OR
Common configuration
Logic27
General logic diagram of the undervoltage elements - 27
all-F27.ai
U
MMI
U<< Element
Disable 27 elements
Start U<<
Start U<< Start U<
Trip U<Trip U<<
&
≥
U< disbyU<<
U< inhibition
U<< inhibition
t
U<
def
t
U<
inv
U<
def
t
U<<
def
U<<
def
U<
inv
U< CurveU< EnableState
Block1
BLK1U<
&
U<BLK1
Start U<
&
Block1
BLK1U<<
&
U<<BLK1
Start U<<
&
U<BF
Trip U<
&
U<BF
U
AND
U
U
L1
,U
L2
,U
L3
OR
Common configuration
Logic27
General logic diagram of the undervoltage elements - 27
Fun-F27_S1.ai
Logic diagram concerning the first threshold (U<) of the undervoltage element - 27
U< Inhibition
(ON≡
Inhibit
)
&
U< Curve
0T
RESET
t
U<
0T
TRIPPING MATRIX
(LED+RELAYS)
t
U<def
t
U<inv
Start U<
U<ST-K
Start U<
U<TR-K
U<ST-L
U<TR-L
Trip U<
Trip U<
Trip U<
BF Enable (ON≡Enable)
U<BF
towards BF logic
&
BLK1U<
U< BF
&
&
&
Enable (ON≡Enable)
Block1 input (ON≡Block)
U<BLK1
Block1
Block1
Logic27
≥1
&
U
L1
U
L2
U
L3
Binary input INx
T0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T0
n.o.
n.c.
INx
t
OFF
≥1
&
State
U<
inv
U ≤
U<
def
U ≤
U<
inv
U<
def
&
State
ON≡Enable U< undervoltage element
U< Enable
27 Inhibition
(ON≡
Inhibit
)by MMI
Fun-F27_S1.ai
Logic diagram concerning the first threshold (U<) of the undervoltage element - 27
U< Inhibition
(ON≡
Inhibit
)
&
U< Curve
0T
RESET
t
U<
0T
TRIPPING MATRIX
(LED+RELAYS)
t
U<def
t
U<inv
Start U<
U<ST-K
Start U<
U<TR-K
U<ST-L
U<TR-L
Trip U<
Trip U<
Trip U<
BF Enable (ON≡Enable)
U<BF
towards BF logic
&
BLK1U<
U< BF
&
&
&
Enable (ON≡Enable)
Block1 input (ON≡Block)
U<BLK1
Block1
Block1
Logic27
≥1
&
U
L1
U
L2
U
L3
Binary input INx
T0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T0
n.o.
n.c.
INx
t
OFF
≥1
&
State
U<
inv
U ≤
U<
def
U ≤
U<
inv
U<
def
&
State
ON≡Enable U< undervoltage element
U< Enable
27 Inhibition
(ON≡
Inhibit
)by MMI
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