Yokogawa EJX930A - Manual (Page 16)

<2. Handling Cautions>
2-5
IM 01C25T02-01E
 FNICO Rules
The FNICO Concept allows the interconnection of
nonincendive field wiring apparatus to associated
nonincendive field wiring apparatus not specifically
examined in such combination. The criterion for
such interconnection is that the voltage (Vmax),
the current (Imax) and the power (Pmax) which
nonincendive field wiring apparatus can receive and
remain nonincendive, considering faults, must be
equal or greater than the voltage (Uo, Voc or Vt),
the current (Io, Isc or It) and the power (Po) which
can be provided by the associated nonincendive
field wiring apparatus (supply unit). In addition the
maximum unprotected residual capacitance (Ci)
and inductance (Li) of each apparatus (other than
terminators) connected to the Fieldbus must be less
than or equal to 5nF and 10uH respectively.
In each N.I. Fieldbus segment only one active
source, normally the associated nonincendive
field wiring apparatus, is allowed to provide the
necessary power for the Fieldbus system. The
allowed voltage (Uo, Voc or Vt) of the associated
nonincendive field wiring apparatus used to supply
the bus cable must be limited to the range 14Vdc
to 17.5Vdc. 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 a leakage current of 50É A for each
connected device. Separately powered equipment
needs galvanic isolation to ensure the nonincendive
field wiring Fieldbus circuit remains passive.
Cable
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...1 mH/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
thescreen is connected to one line.
Length of spur cable: max. 30 m
Length of trunk cable: max. 1 km
Length of splice: max = 1 m
Terminators
At the end of each trunk cable an FM Approved line
terminator with the following parameters is suitable:
R= 90...100 Ω
C = 0 ....2.2 uF
2.1.2 CSA Certification
a. CSA Explosionproof Type
Caution for CSA explosionproof type.
Note 1. The transmitters with optional code /CF1
are applicable for use in hazardous
locations:
Certificate: 2014354
• Applicable Standard:
C22.2 No.0, C22.2 No.0.4, C22.2 No.0.5,
C22.2 No.25, C22.2 No.30, 22.2 No.94,
C22.2 No.61010-1-04, C22.2 No.60079-0,
C22.2 No.60079-1
• Explosion-proof for Class I, Groups B, C and
D.
• Dustignition-proof for Class II/III, Groups E, F
and G.
• Enclosure: NEMA 4X, IP66/IP67
• Temperature Code: T6...T4
• Ex d IIC T6...T4
• Enclosure: IP66 and IP67
• Maximum Process Temperature:
120°C (T4), 100°C (T5), 85°C (T6)
• Ambient Temperature:
–50* to 75°C (T4), –50* to 80°C (T5),
–50* to 75°C (T6)
* –15°C when /HE is specified.
• Supply Voltage: 32 V dc max.
• Output Signal: 15 mA dc
Note 2. Wiring
• All wiring shall comply with Canadian
Electrical Code Part I and Local Electrical
Codes.
• In hazardous location, wiring shall be in
conduit as shown in the figure.
• WARNING:
A SEAL SHALL BE INSTALLED WITHIN
50cm OF THE ENCLOSURE.
UN SCELLEMENT DOIT ÊTRE INSTALLÉ À
MOINS DE 50cm DU BOÎTIER.
• WARNING:
WHEN INSTALLED IN CL.I, DIV 2, SEAL
NOT REQUIRED.
UNE FOIS INSTALLÉ DANS CL I, DIV 2,
AUCUN JOINT N'EST REQUIS.
Note 3. Operation
• WARNING:
AFTER DE-ENERGIZING, DELAY 5
MINUTES BEFORE OPENING.
APRÉS POWER-OFF, ATTENDRE 5
MINUTES AVANT D'OUVRIR.