FP-CTR-500 and cFP-CTR-500
18
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Isolation and Safety Guidelines
Caution
Read the following information before
attempting to connect the [c]FP-CTR-500 to any circuits
that may contain hazardous voltages.
This section describes the isolation of the [c]FP-CTR-500 and its
compliance with international safety standards. The field wiring
connections are isolated from the backplane and the inter-module
communication bus. The isolation is provided by the module,
which has optical and galvanic isolation barriers designed and
tested to protect against transient fault voltages of up to 2,300 V
rms
.
Follow these guidelines to ensure a safe total system.
•
The [c]FP-CTR-500 has a safety isolation barrier between the
I/O channels and the inter-module communication bus. There
is no isolation between channels unless otherwise noted. If any
of the channels on a module are wired at a hazardous potential,
make sure that all other devices or circuits connected to that
module are properly insulated from human contact.
•
Do
not
share the external supply voltages (the V and C
terminals) with other devices (including other FieldPoint
devices), unless those devices are isolated from human contact.
•
For Compact FieldPoint, you
must
connect the protective earth
(PE) ground terminal on the cFP-BP-
x
backplane to the system
safety ground. The backplane PE ground terminal has the
following symbol stamped beside it:
. Connect the
backplane PE ground terminal to the system safety ground
using 14 AWG (1.6 mm) wire with a ring lug. Use the 5/16 in.
panhead screw shipped with the backplane to secure the ring
lug to the backplane PE ground terminal.
•
As with any hazardous voltage wiring, make sure that all
wiring and connections meet applicable electrical codes and
commonsense practices. Mount terminal bases and backplanes
in an area, position, or cabinet that prevents accidental or
unauthorized access to wiring that carries hazardous voltages.
•
Operate the [c]FP-CTR-500 only at or below Pollution
Degree 2. Pollution Degree 2 means that only nonconductive
pollution occurs in most cases. Occasionally, however,
a temporary conductivity caused by condensation must be
expected.