Remove Power; Selecting A Location; Reducing Noise; Power Supply Distance - Spectrum Controls 1769 Series User Manual

2-4 Chapter 2: Installation and Wiring
WARNING
User's Manual Pub. 0300244-02 Rev. A

2.5.3 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.
• Causing an electrical arc. Such arcing causes excessive wear to
contacts on both the module and its mating connector and may
lead to premature failure.

2.5.4 Selecting a Location

Reducing Noise

Most applications require installation in an industrial enclosure to reduce the
effects of electrical interference. Analog inputs are highly susceptible to
electrical noise. Electrical noise coupled to the analog inputs 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,
1769-IA16. Refer to the module's heat dissipation specification.
In addition, route shielded, twisted-pair analog input wiring away from any high
voltage I/O wiring.

Power Supply Distance

You can install as many modules as your power supply can support. However,
all 1769 I/O modules have a power-supply distance rating.
such as the