68
FUNCTION CHARACTERISTICS
Open CB
Close CB
The external acquisition of remote commands allows to drive CB remotely.
Preset DTheta
The input activation presets the thermal image (49).
The preset value can be adjusted by means the D
θ
IN
setting. The thermal image is initialized at the
D
θ
IN
value when the device is powered or when the binary input become active.
Remote trip
The input activation drives an expressly programmed output relay.
MCB VT OPEN
MCB VT2 OPEN
The external acquisition of MCB auxiliary contact allows to detect a failure on the secondary circuit
of the voltage transformer (VTs); the information is available for the VT monitoring function (74VT).
CB-com.ai
OPEN
Command
CLOSE
Command
UAUX
+UAUX
UAUX
INx
INx
Binary input INx
T 0
INx
t
ON
T0
n.o.
n.c.
INx tON
Logic
Open CB
Close CB
INx tOFF
INx
t
OFF
Binary input INx
T 0
IN2
t
ON
T0
n.o.
n.c.
INx tON
Logic
INx tOFF
IN2
t
OFF
Binary input allocation for CB remote command
TRIPPING MATRIX
(LED+RELAYS)
-UAUX
-UAUX
52a
52
O
I
52b
inhit-theta.ai
t = T+·ln{[(I
th
/I
B
)
2
-Dθ
P
/Dθ
B
]/[(I
th
/I
B
)
2
-1.2]Dθ
P
= Dθ
IN
Binary input allocation for thernal image preset (49)
UAUX
UAUX
INx
PresetDTheta
PresetDTheta
Binary input INx
T 0
Logic
INx
t
ON
IN1
t
ON
INx
t
OFF
0
n.o.
n.c.
IN1
t
OFF
Remote-trip.ai
Remote trip
+UAUX
-UAUX
Remote trip
Binary input INx
T 0
INx
t
ON
T0
n.o.
n.c.
INx tON
Logic
INx tOFF
INx
t
OFF
TRIPPING MATRIX
(LED+RELAYS)
Assegnazione ingresso logico alla acquisizione del segnale d’ingresso di telescatto
MCB-open.ai
Binary input allocation for state acquisition of the MCB auxiliary contact
VT Monitoring (74VT)
Binary input INx
T 0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T0
n.o.
n.c.
INx
t
OFF
UAUX
UAUX
INx
MCB VT OPEN
VT
LINE
MCB
TO VOLTAGE INPUTS
XMR-D EQUIPMENT MANUAL
Ed. 2.9 - 02/2021
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