Rockwell Automation AADvance Controller System Build - Manual (Page 37)

Document: 553632
(ICSTT-RM448_EN_P) Issue: 08:
2-7
Adding Cable Management Adding Cable Management Adding Cable Management Adding Cable Management
The field, power and other system wiring will be connected to terminals along the top
of the base units. It is recommended a length of trunking or similar be located above
each set of base units, for cable management.
Controller Design Considerations for Heat and Cooling Controller Design Considerations for Heat and Cooling Controller Design Considerations for Heat and Cooling Controller Design Considerations for Heat and Cooling
The controller is designed to operate in its specified environment without forced air
cooling. However, forced air cooling may be needed in individual circumstances when
the controller shares its enclosure with other heat producing equipment. The design
and positioning of the enclosure should keep the controller environment within a
range of 25°C to 40°C for normal operation and and to maintain predictable reliability
for the equipment.
Note: Component failure rate of the controller doubles with every 10°C rise in
temperature.
System Power Requirements System Power Requirements System Power Requirements System Power Requirements
A controller's system power (AADvance standard or Eurocard controller) should be
supplied from two independent 24V dc power supplies with a common return path;
that is, the 24V return shall be common between the power feeds. Each controller also
requires an external field power source for the output modules.
A controller system must be installed with a power network that is designed
to meet over voltage Category II (see BS EN 60664-1)
This means that a controller must be supplied with system power from a power
source that complies with SELV and PELV standards.
SELV (safety extra-low voltage) is a voltage which does not exceed 50VAC or 120
V ripple-free DC between conductors, or between each conductor and earth in a
circuit which is isolated from the line voltage by a safety transformer.