Spectrum Controls 1762sc-IF4OF4 - Manual (Page 15)

Chapter 2: Installation and Wiring 2-3
User’s Manual Pub. 0300247-01 Rev. C
!
Attention
EXPLOSION HAZARD
 Substitution of components may impair suitability for Class I,
Division 2.
 Do not replace components or disconnect equipment unless
power has been switched off or the area is known to be non-
hazardous.
 Do not connect or disconnect components unless power has
been switched off or the area is known to be non-hazardous.
 This product must be installed in an enclosure.
 All wiring must comply with N.E.C. article 501-4(b).
2.3.2 Prevent Electrostatic Discharge
!
Attention
Electrostatic discharge can damage integrated circuits or
semiconductors if you touch analog I/O module bus connector pins or
the terminal block on the input module. Follow these guidelines when
you handle the module:
 Touch a grounded object to discharge static potential.
 Wear an approved wrist-strap grounding device.
 Do not touch the bus connector or connector pins.
 Do not touch circuit components inside the module.
 If available, use a static-safe work station.

When it is not in use, keep the module in its static-shield bag.
2.3.3 Remove Power
!
Attention
Remove power before removing or inserting this module. When you
remove or insert a module with power applied, an electrical arc may
occur. An electrical arc can cause personal injury or property damage
by:
 Sending an erroneous signal to your system’s field devices,
causing unintended machine motion
 Causing an explosion in a hazardous environment
Electrical arcing causes excessive wear to contacts on both the module
and its mating connector and may lead to premature failure.
2.3.4 Selecting a Location
Reducing Noise
Most applications require installation in an industrial enclosure to reduce the effects of
electrical interference. Analog inputs and outputs are highly susceptible to electrical
noise. Electrical noise coupled to the analog inputs or outputs will reduce the
performance (accuracy) of the module. Group your modules to minimize adverse effects
from radiated electrical noise and heat. Consider the following conditions when selecting
a location for the analog module. Position the module:
 Away from sources of electrical noise such as hard-contact switches, relays, and
AC motor drives
 Away from modules which generate significant radiated heat. Refer to the
module’s heat dissipation specification.
In addition, route shielded, twisted-pair analog input and output wiring away from any
high voltage I/O wiring.