National Instruments cFP-RTD-124 User Manual download pdf (Page 10)

FP-RTD-124 and cFP-RTD-124 10 ni.com

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-RTD-124 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-RTD-124 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.

• Refer to the FieldPoint product label for regulatory

certification under hazardous location standards. If the

FieldPoint product is not certified for operation in hazardous

locations, do not operate it in an explosive atmosphere or

where there may be flammable gases or fumes.

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National Instruments cFP-RTD-124 User Manual Page 10