Spectrum Controls 1769sc-HART Modules - Manual (Page 21)

Chapter 3: Installation and Wiring
User’s Manual 0300217-03 Rev. A
3-3
3.3.3 Remove Power
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.
3.3.4 Selecting a Location
Reducing Noise
Most applications require installation in an industrial enclosure to reduce the effects of
electrical interference. Analog outputs are highly susceptible to electrical noise. Electrical
noise coupled to the analog outputs will reduce the performance (accuracy) of the
module.
Group your modules to minimize adverse effects from radiated electrical noise. 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 high voltage conductors
In addition, route shielded, twisted-pair analog input wiring away from any high voltage
I/O wiring.
Reducing Heat
To avoid complications when operating in ambient temperatures in excess of 55 degrees
C, the following recommendations should be followed. Position the module:
 Away from heat sources such as transformers, variable frequency drives, and cabinet
heaters.
 Avoid installing the module adjacent to modules which generate over 4 W of heat,
such as the 1769-HSC. The table below lists modules which should be avoided if
possible:
Table 3-1 (Modules To Avoid)
Module Catalog Max Thermal Dissipation
1769-ADN 4.7
1769-HSC 6.2
1769-IQ32 4.8
1769-OW16 4.8
1769-OB32 4.5
!
Attention