Thytronic NC20 - Page 76

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76
NC2 0 - Manual - 01 - 2015
FUNCTION CHARACTERISTICS
Fun_49_AL2.ai
Common configuration
&
dDθ/dt + Dθ/T = (Ith/I
B
)
2
/T
Init DTheta
Dθ ≥ DthAL2
DthAL2
Binary input INx
T0
Logic
INx t
ON
INx t
ON
INx t
OFF
T0
n.o.
n.c.
INx t
OFF
I
th
≥1
K
INR
DthAL2
CB-State
ON≡Enable element
(Pickup within CLP)
(Pickup outside CLP)
Pickup - CLP setting change
Block1, Block2
T0
t
DthCLP
DthCLPMode
t
DthCLP
I
th
∙ K
INR
TRIPPING MATRIX (LED+RELAYS)
A
B
C
A =“1”A =“0 or OFF”
Output
t
DthCLP
DthAL2 Enable
DThhAL2 thermal image (49) block diagram
t
DthCLP
CB State CB OPEN CB CLOSED CB OPEN
Output t
DthCLP
t
0.1 s
HIGH THRESHOLD/
BLOCK
LOW THRESHOLD/
UNBLOCK
HIGH THRESHOLD/
BLOCK
A = ON - Change setting
B = OFF
C = ON - Element blocking
DthAL2-L
DthAL2-K
≥1
CLP Dth
T DthIN
Thermal image (49) - Logic diagram of the second alarm threshold