Metso neles ND9000H Installation, Maintenance And Operation Instructions page 54

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ND9100F, ND9100P, ND9300F, ND9300P
1 FMRC and CSA Option:
ND9100PU1 and ND9100FU1 (ND9100PU2 and ND9100FU2)
This concept may only be applied if all devices at the fieldbus line are approved and specified for the FISCO
model, also the barrier or Segment coupler must be specified for the FISCO model.
HAZARDOUS (CLASSIFIED) LOCATION
Class I, Division 1 and 2, Groups A, B, C, D
Class I, Zone 0, AEX ia, Group IIB/IIC T4/ T5/T6
T4 : Ta = -40...80 °C
T5: Ta = -40...65 °C
T6: Ta = -40...50 °C
METSO Automation OY:
ND9100PU1/U2 or
ND9100FU1/U2
Fieldbus Valve Controller
Entity Parameters:
Ui ≤
24,0V
≤
Ii 380ma
Pi ≤
5,32W
Ci < 5nF
Li < 10µH
FISCO rules
The FISCO Concept allows the interconnection of intrinsically safe apparatus to associated apparatus not
specifically examined in such combination. The criterion for such interconnection is that the voltage (Ui), the
current (Ii) and the power (Pi) which intrinsically safe apparatus can receive and remain intrinsically safe,
considering faults, must be equal or greater than the voltage (Uo, Voc, Vt), the current (Io, Isc, It,) and the
power (Po) which can be provided by the associated apparatus (supply unit). In addition, the maximum
unprotected residual capacitance (Ci) and inductance (Li) of each apparatus (other than the terminators)
connected to the Fieldbus must be less than or equal to 5 nF and 10 µH respectively.
In each I.S. Fieldbus segment only one active source, normally the associated apparatus, is allowed to
provide the necessary power for the Fieldbus system. The allowed voltage (Uo, Voc, Vt) of the associated
apparatus used to supply the bus must be limited to the range of 14V d.c. to 24V d.c. All other equipment
connected to the bus cable has to be passive, meaning that the apparatus is not allowed to provide energy to
the system, except to a leakage current of 50 µA for each connected device. Separately powered equipment
needs a galvanic isolation to insure that the intrinsically safe Fieldbus circuit remains passive.
The cable used to interconnect the devices needs to comply with the following parameters:
Loop resistance R': 15 ...150 Ω/KM
Inductance per unit length L': 0.4...1mH/km
Capacitance per unit length C': 80 ...200 nF/km
C' = C' line/line + 0.5 C' line/screen, if both lines are floating
or
C'= C' line/line + C' line/screen, if the screen is connected to one line
Length of spur Cable: max. 30m
Length of trunk cable: max. 1Km
Length of splice: max. 1m
Terminators
At each end of the trunk cable an approved line terminator with the following parameters is suitable:
R = 90 ...100 Ω
C = 0 ...2.2 µF.
System evaluation
The number of passive devices like transmitters, actuators, connected to a single bus segment is not limited
due to I.S. reasons. Furthermore, if the above rules are respected, the inductance and capacitance of the
cable need not to be considered and will not impair the intrinsic safety of the installation.
NONHAZARDOUS LOCATION
connect the cable shield
to earth ground
FMRC approved associated
apparatus with applicable zone and
group approval which is specified for
the FISCO model e.g.:
- Fieldbus IS barrier
- Segment coupler with
integrated barrier
Entity Parameters:
Uo ≤ Ui
≤ Ii
Io
Po ≤ Pi
7 ND90 70 en