National Instruments FP-PWM-520 - Manual (Page 10)

FP-PWM-520 and cFP-PWM-520 10 ni.com
• 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-PWM-520 as the only isolating barrier
between human contact and working voltages higher than
250 V
rms
.
• Operate the [c]FP-PWM-520 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-PWM-520 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.
Safety Guidelines for Hazardous Locations
The cFP-PWM-520 is suitable for use in Class I, Division 2,
Groups A, B, C, D, T4 hazardous locations; Class I, Zone 2,
AEx nC IIC T4 and Ex nC IIC T4 hazardous locations; and
nonhazardous locations only. Follow these guidelines if you are
installing the cFP-PWM-520 in a potentially explosive
environment. Failing to follow these guidelines may result in
serious injury or death.
Caution Make sure that all products you use in hazardous
locations are certified for such use. Refer to the product
label or visit
ni.com/certification , search by model