FUNCTION CHARACTERISTICS
125
NVA100X-D - Manual - 02 - 2016
Thermal image (49MG) - Logic diagram of the trip threshold
Starting control set
Starting
control
&
C L P s o ur ce
M R E nab l e
CB-State
I
R U N
= 0.1
I
B
M a x [
I
L1...
I
L3
] ≥
I
RUN
I
L1...
I
L3
Output
t
CLP
t
CLP
M a x [
I
L1...
I
L3
] ≥
I
RUN
M a x [
I
L1...
I
L3
] ≥
I
RUN
M a x [
I
L1...
I
L3
] <
I
RUN
S t ar t i ng de t ec t i o n
R e s e t C L P t i m e r
CB State
CB OPEN
CB CLOSED
CB CLOSED
CB OPEN
t
I
RUN
t
CLP
0.1 s
HIGH THRESHOLD/
BLOCK
LOW THRESHOLD/
UNBLOCK
UNBLOCK
UNBLOCK
HIGH THRESHOLD/
BLOCK
HIGH THRESHOLD/
BLOCK
+
U
AUX
-
U
AUX
Binary input INx
T
0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
0
n.o.
n.c.
INx
t
OFF
Motor restart
Motor restart
Motor restart
LOW TH.
LOW TH.
Fun_49MG_Dth.ai
Dth>
&
D
θ
≥
Dth>
Dth>
ON
≡
Enable element
TR
IP
P
ING
M
ATR
IX
(LED
+R
EL
AY
S
)
Dth> Enable
Dth>-L
Dth>-K
BF Enable (ON
≡
Enable)
Dth>BF
towards BF logic
Dth> BF
&
Trip Dth>
DTh> thermal image (49) block diagram
Block1, Block2
T
0
t
DthCLP
DthCLPMode
t
D t h C L P
A
B
C
Output
t
DthCLP
Starting control set
A = ON - Change setting
B = OFF
C = ON - Element blocking
≥
1
≥
1
A
B
C
A = ON - Change setting
A
B
C
C = ON - Element blocking
A
B
C
B = OFF
Init DTheta
Binary input INx
T
0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T
0
n.o.
n.c.
INx
t
OFF
I
t h
K
ST
(
I
t h
within CLP)
(
I
t h
outside CLP)
I
t h
/
K
S T
A =“1”
A =“0”
Change
setting
Change
setting
Element
blocking
B or C
dD
θ
/dt + D
θ
/T+ = (Ith/I
B
)
2
/T+
dD
θ
/dt + D
θ
/T- = 0
T
+
T
-
DthIN
I
t h
= √
I
1
2
+ K
2
I
2
2
K
2
I
1
I
2
