KROHNE OPTISONIC 3400 CSA EN - Manual (Page 23)

ELECTRICAL CONNECTIONS
4
23
OPTISONIC 3400
www.krohne.com 10/2013 - 7313222100 - AD CSA OPTISONIC 3400 -en- R01
4.5 I.S. I/O connections
The following intrinsically safe I/O connections are available:
The I/O circuits titled “Ex i I/O” and “Ex i Option” are always provided with type of protection
Intrinsic Safety . The I/O-circuits “Fieldbus I/O Profibus-PA” as well as “Fieldbus I/O Foundation
Fieldbus” can be provided with type of protection Intrinsic Safety.
Up to a maximum of 4 intrinsically safe in-/outputs are possible. All intrinsically safe circuits are
galvanically isolated with respect to earth and each other. To avoid summation of voltages and
current, the wiring of these circuits must be sufficiently separated.
The intrinsically safein-/outputs may only be connected to other intrinsically safe approved
devices (e.g. intrinsically safe isolation amplifiers), even if such devices are installed in a non-
hazardous location !
Connection to non-I.S. devices, cancels the intrinsically safeproperties of the flowmeter.
Terminals L and N (or L+ and L-) for connection of the mains supply are not available with type of
protection “intrinsic safety”. To achieve the necessary separation distances between the non-I.S.
and I.S.circuits, the mains terminals are provided with a semi-circular protection cover with a
“
snap-in” lock. This cover MUST be closed before establishing the power supply to the converter.
I/O PCB I/O PCB I/O PCB I/O PCB I/O functions I/O functions I/O functions I/O functions
Ex i I/O Current Output, passive, +
HART communication
V
max
(U
i
) = 30 V, I
max
(I
i
) = 100 mA, P
i
= 1,0 W,
C
i
= 5 nF, L
i
= 5 μH
Pulse / Status Output V
max
(U
i
) = 30 V, I
max
(I
i
) = 100 mA, P
i
= 1,0 W,
C
i
= 2.2 nF, L
i
= 5 μH
Current Output, active +
HART communication
V
oc
(U
o
) = 21 V, I
sc
(I
o
) = 77.5 mA, P
o
= 407 mW
liniair characteristics, C
a
(C
o
) = 188 nF,
L
a
(L
o
)= 6.0 mH
Ex i Option Current Output, passive V
max
(U
i
) = 30 V, I
max
(I
i
) = 100 mA, P
i
= 1,0 W,
C
i
= 5 nF, L
i
= 5 μH
Pulse / Status Output or
Control Input
V
max
(U
i
) = 30 V, I
max
(I
i
) = 100 mA, P
i
= 1,0 W,
C
i
= 2.2 nF, L
i
= 5 μH
Current Output, active V
oc
(U
o
) = 21 V, I
sc
(I
o
) = 77.5 mA, P
o
= 407 mW
liniair characteristics, C
a
(C
o
) = 188 nF,
L
a
(L
o
)= 6.0 mH
Fieldbus I/O Profibus-PA
Foundation Fieldbus
V
max
(U
i
) = 24 V, I
max
(I
i
) = 250 mA, P
i
= 1,2 W,
C
i
= 5 nF, L
i
= 10 μH
Suitable for connection to an intrinsically
safe fieldbus in accordance with the FISCO-
model
INFORMATION!
For flow converters installed in a Division 2, the non-incendive terminal compartment can be
opened in an energized state for short periods of time, to access the intrinsically safe terminals
for possible checks. However, the semi-circular insulation cover over the non-intrinsically safe
mains supply terminals L and N (or L+ and L-) MUST be kept closed.