Section 2.4 Selecting A Rack Slot; Section 2.5 Selecting A Location; Section 2.6 Inserting Your Module Into The Rack - Spectrum Controls SLC 500 User Manual

Section 2.4
Selecting a
Rack Slot
Section 2.5
Selecting a
Location
Section 2.6
Inserting your
Module into
the Rack
WARNING
When using the module in a modular system, add the values shown above to the
requirements of all other modules in the SLC to prevent overloading the chassis
power supply.
Two factors determine where you should install your module in the rack:
ambient temperature and electrical noise. When selecting a slot for your module,
try to position your module:
In a rack close to the bottom of the enclosure (where the air is cooler).
•
Away from modules that generate significant heat, such as 32-point
•
input/output modules.
• In a slot away from AC or high-voltage DC modules, hard contact
switches, relays, and AC motor drives.
• Away from the rack power supply (if using a modular system).
Remember that in a modular system, the processor always occupies the first slot.
of the rack.
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. 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.
POSSIBLE EQUIPMENT OPERATION
Before installing or removing your module, always disconnect power from
the SLC 500 system and from any other source to the module (in other
words, do not "hot swap" your module), and disconnect any devices wired
to the module.
Failure to observe this precaution can cause unintended equipment
operation and damage.
Chapter 2: Installation and Wiring
User's Manual Pub. 0300181-07 Rev. A
2-3