EZ Automation EZTouch I/O Flex, Инструкция по эксплуатации

Страница: 9 / 64

EZTouchPLC
9 / 64
Installation Considerations
Our products have been designed and tested for operation in the most
demanding industrial environments. Modern solid-state industrial controls are
complex electronic equipment that operate at low levels of voltage and current,
co-existing with components that operate at much higher levels of power. The
difference in operating power characteristics between the high and low power
control devices creates the possibility of unwanted signals being generated, thus
causing interference. The interference, which is a by-product of electrical noise,
is not present at all times. However, if it appears at random and for brief periods
of time, it can cause disruptions and errors in the operation of a control system.
Enhancement of a system's noise level immunity and its tolerance to other
environmental hazards can be accomplished by following proper system
installation guidelines. The recommendations are of a general nature and
constitute good industrial installation practice.
General Environmental Considerations
Avoid installing the
EZTouchPLC
unit in areas where the following
conditions may exist:
o
Environmental temperatures above or below those specified for the
EZTouchPLC
unit
o
Prolonged exposure to humidity and liquids which may be sprayed or
splashed on the equipment
o
Dusty environments where airborne particles may accumulate on
equipment causing reduction of heat dissipation and reduction in
effective electrical spacing between components
o
Areas with excessive vibration
o
Areas with high-radiated electrical noise, such as near fields of
transmitting antennas and areas in close proximity of arc welding
stations
Physical Layout in a Control Cabinet
When possible, cabinets housing electronic equipment should be designed with
provisions for natural or forced ventilation to facilitate heat dissipation.
Observe the following rules for cabinet installation:
o
Heat generating equipment
(power supplies and other heat
inducing components) should
be installed toward the top of
the cabinet. The lower space in
the cabinet is cooler than the
top area.
o
Install heat-sensitive
components in the lower
section.
o
Provide enough space between
components to allow a free flow
of air for better heat dissipation.
o
Provide the maximum possible physical separation between solid state