ABB VA Master FAM540, Руководство по эксплуатации

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VA Master FAM540 METAL CONE VARIABLE AREA FLOWMETER | OI/FAM540-EN REV. E 25
Installation instructions
The concept of intrinsic safety enables multiple intrinsic safety
devices with FM or CSA approval to be interconnected, without
entity parameters being examined specifically, subject to
observation of the following conditions:
• U
o
or V
oc
or V
t
≤ 0 V max, I
o
or I
sc
or I
t
≤ I
max
, C
a
or C
o
≥ C
i
+
C
cable
, L
a
or L
o
≥ L
i
+ L
cable
, P
o
≤ P
i
.
• For installation in Class II and III environments, dust-proof
ignition blocks must be used.
• Devices connected to such equipment must not use or
generate rms or DC voltage in excess of 250 V.
• The installation must meet the requirements in
accordance with ANSI / ISA RP 12.6 ‘Installation of
Intrinsically Safe Systems for Hazardous Locations’ and
the National Electrical Code (ANSI / NFPA 70) sections
504, 505 and CEC.
• The configuration of the associated apparatus must have
Factory Mutual Research and CSA approval in accordance
with the entity concept.
• Devices must be installed in accordance with the
manufacturer-supplied installation drawing of the
associated equipment.
• Changes to drawings are only permitted subject to prior
approval from Factory Mutual Research and CSA.
• Only shielded twisted pair cables may be used (see
above).
Note
For intrinsically safe installations, the FAM540 must be installed
in accordance with the ‘Intrinsic Safety Control Drawing’. See
Intrinsic Safety Control Drawing SDM-10-A0253 on page 63.
Earthing
1 Ground terminal
2
Potential equalization in accordance with EN 60079-0
Figure 8: Grounding
The FAM540 housing must be correctly earthed in order to
ensure proper function and safe operation.
Copper wires with a minimum cross-section of 6 mm
2
(AWG 10)
must be used to connect to the potential equalization.
Note
The operator must make sure that when connecting the
protective ground (PE), there are no potential differences
between protective ground (PE) and potential equalization, even
in the event of a fault.
Signal cable
For ambient temperatures below 5 °C (41 °F) or above
40 °C (104 °F), signal cables that are suited for the
minimum/maximum ambient temperatures in question must be
used.
Only use signal cables made from copper, copper-coated
aluminum, or aluminum.
The recommended tightening torque for the terminals is 0.8 Nm
(7 in lb) or higher, in accordance with the specification.