©
National Instruments Corp.
13
FP-DIO-550 and cFP-DIO-550
Even though the [c]FP-DIO-550 is designed to handle applications
with hazardous potentials, follow these guidelines to ensure a safe
total system:
•
There is no isolation between channels on the [c]FP-DIO-550.
If a hazardous voltage is present on any channel, all channels
are considered hazardous. Make sure that all other devices and
circuits connected to the 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.
•
Do
not
use the [c]FP-DIO-550 as the only isolating barrier
between human contact and working voltages higher than
250 V
rms
.
•
Operate the [c]FP-DIO-550 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.
•
Operate the [c]FP-DIO-550 at or below Measurement
Category II. Measurement Category II is for measurements
performed on circuits directly connected to the low-voltage
installation. This category refers to local-level distribution,
such as that provided by a standard wall outlet.
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