KROHNE MFC 010 C Converter - Manual (Page 16)

14
MFC010 Interface Manual
The output safety par ameters of t he bar rier dev ices m ust not ex ceed t he V oltage, P ower and C urrent
limits set out above. T he output Capacitance parameter for the barrier devices must exceed the sum of
the M FC010 i nput C apacitance, s pecified abov e, and t he m aximum c able Capacitance. The output
Inductance par ameter f or t he bar rier dev ices m ust ex ceed t he sum of the MFC010 input Inductance,
specified above, and maximum cable Inductance. To summarise:
U
o
Barrier
< U
i
MFC010
I
o
Barrier
< I
i
MFC010
P
o
Barrier
< P
i
MFC010
C
o
Barrier
> C
cable
+ C
i
MFC010
L
o
Barrier
> L
cable
+ L
i
MFC010
NB
The In-line resistance of the Modbus barrier MUST NOT EXCEED 1000 Ohms for each of the A and
B Input terminals.
The Zener barrier devices must be i nstalled in an E MI shielded enclosure and t he cable screen(s) kept
intact right up to the barrier terminals as far as is practical. The cable screen(s) should be terminated to
the enclosure, chassis Earth connection, and kept SEPARATE from t he i ntrinsically s afe E arth
connections of the Barrier devices. The user MUST adhere to the barrier manufacturer’s instructions for
connecting the intrinsically safe Earth connection to the barrier devices.