Foxboro G66 Triconex Tricon Termination Enclosure

Cooling System and Thermal Management: Passive Convection and Intelligent Temperature Control

The G66 cabinet adopts an efficient passive convection cooling system, which does not require active liquid cooling. However, for different configurations, a variety of fan options are provided to optimize thermal performance.

Fan position strategy:

Top mounted fan: Provides optimal cooling performance, but limits access to the top wiring inlet. This is usually used for ventilated enclosures.

Door mounted fan: Provides higher noise control and allows wiring at the top, maximizing the flexibility of cable entry. Door mounted fans are typically used in sealed enclosures or scenarios that require top wiring.

Thermal load calculation: The cabinet design can withstand a maximum thermal load of 500 watts (average for ventilated types) or 1000 watts (maximum for sealed types), depending on the fan configuration and ambient temperature.

Dual thermostat: To prevent overheating or overcooling, G66 is equipped with an optional dual thermostat. This device monitors the extreme temperature of the cabinet and pre-set high and low temperature alarms (NC contact, -0 to 60 ° C, range 32 to 140 ° F) and low temperature alarms (NO contact, -0 to 60 ° C, range 32 to 140 ° F). This intelligent thermal management mechanism ensures device reliability in hot or cold climates.

Power architecture and redundancy design

To ensure high availability of the control system, G66 supports a comprehensive on-site power solution, including redundant distribution and EMC filtering.

Redundant power supply support: The cabinet supports 480 watt AC or 960 watt 24V DC redundant on-site power supply. These power supplies are usually installed horizontally inside the cabinet. Supports two or four pairs of redundant 24V DC power supplies and is installed on dedicated power DIN rails. This design ensures that if one power source fails, another can seamlessly take over the load, preventing system shutdown caused by a single point of failure.

Main power supply wiring: The main power supply enters through the bottom terminal block or conduit. The wiring board contains isolation switch terminal blocks (10A, D-type, bipolar circuit breaker), providing maintenance personnel with the ability to operate safely and with power on.

EMC/RFI Filter: For applications with strict requirements for electromagnetic compatibility (EMC), especially when installing SMM or SRXM modules that do not come with EMC standard terminals, G66 supports the installation of optional EMC/RFI line filters. These filters can be installed on the main power supply line to suppress high-frequency noise and ensure the stable operation of the Tricon system in complex electromagnetic environments.

Customer customization: The cabinet can be configured as an integrated solution that includes on-site power distribution terminal blocks or circuit breaker components to meet specific regional electrical specifications.

Internal layout, wiring management, and signal isolation

The internal layout of the G66 cabinet has been carefully optimized to accommodate high-density wiring equipment and provide clear cable management.

DIN rail system: Provides five vertical DIN rails. The full height (31.4 inches or 800 millimeters) of the guide rails on the left and right side walls are used for installing terminal components. In order to accommodate the 24V DC on-site power supply, the height of the DIN rail on the right wall has been lowered to free up space for the power supply equipment. In addition, a dedicated power DIN rail is also provided.

Cable management and trunking: The cabinet supports multiple sizes of universal cable trays or trunking, such as 76mm x 102mm (3 inches x 4 inches), 37mm x 102mm, and 25mm x 152mm. These channels are used to organize Triconex interface cables and on-site wiring to prevent confusion and facilitate troubleshooting. Optional signal isolation boards are also provided to provide electrical isolation between different areas.

Grounding system: Grounding is the key to electrical safety. The G66 is equipped with two protective grounding studs (one on each cabinet side), providing a central grounding point. In addition, an isolation protection grounding rail is provided, which can be used to isolate the grounding of DIN rails or shielded cables to meet complex grounding requirements or eliminate grounding loops.

Materials, Surface Treatment, and Compliance Certification

The G66 cabinet is made of high-quality industrial materials to withstand harsh on-site conditions and ensure long-term durability.

Material and Coating:

Frame, door and roof: Made of 2.0mm (14 gauge) thick galvanized steel plate (RAL 7004 coating), providing excellent corrosion resistance and mechanical strength.

Side panel: Made of galvanized aluminum plate, providing lightweight and sturdy protection.

Pressure plate: Made of plastic (RAL 9005) material, sturdy and durable.

Granboard and internal hardware: made of galvanized steel, which has been passivated to further enhance its antioxidant capacity.

International certification:

UL and UL-C: The empty cabinet has obtained UL and UL-C certifications, meeting the strict safety requirements for electrical equipment in the North American market.