FP-DO-400
6
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Isolation and Safety Guidelines
Caution
Read the following information before
attempting to connect any circuits which may contain
hazardous voltages to the FP-DO-400.
This section describes the isolation of the FP-DO-400 and its
compliance with international safety standards. The outputs are
isolated from the backplane provided by the terminal base with an
optical isolation barrier designed and tested to provide protection
against fault voltages of up to 3000 Vrms. In addition, the
FP-DO-400 provides double insulation (compliant to UL and
IEC safety standards) for working common mode voltages of
250 Vrms. Safety standards (such as those published by UL and
IEC) require the use of double insulation between hazardous
voltages and any human-accessible parts or circuits. You should
never attempt to use any isolation product between human
accessible parts (such as DIN rails or monitoring stations) and
circuits which may be at hazardous potentials under normal
conditions, unless the product is specifically designed (as the
FP-DO-400 is) for such an application.
Even when a product like the FP-DO-400 is used in applications
with hazardous potentials, follow these guidelines to ensure a safe
total system.
•
The safety isolation of the FP-DO-400 is from input to output,
not between channels on the same module. If any of the
channels on a module are wired at a hazardous potential,
ensure that all other devices or circuits connected to that
module are properly insulated from human contact.
•
Do not share the external supply voltages (V and C on the
terminal base) with other devices (including other FieldPoint
devices) unless those devices are also isolated from human
contact.
•
As with any hazardous voltage wiring, ensure that all wiring
and connections meet with applicable electrical codes or
common sense practices. Mount terminal bases in an area,
position, or cabinet that prevents accidental or unauthorized
access to wiring with hazardous voltages.
•
The isolation of the FP-DO-400 is certified as double insulated
for normal operating voltages of 250 Vrms. Do not use the
FP-DO-400 as the sole isolating barrier between human
contact and working voltages of more than 250 Vrms.
