Eurotherm/Barber-Colman T754X series control enclosures

T754X series control enclosures

	Capacity 512 I/O points based on T103/T303 control units
	Redundant options with live replacement of all components
	Standard construction and wiring minimizes cost
	Floor standing and wall mounting versions
	Front access minimizes space required
	Panel workstation and controller options
	Supplied tested and documented against simple order codes and I/O layout sheet
	CE compliant
	Protected up to IP55
	Application specific configurations on request

The T754X series of standard enclosures has been designed to accommodate up to four T103 Unit controllers and associated I/O termination units. The preconfigured design keeps build time and implementation costs to a minimum and all active components are easily removable to facilitate maintenance. Enclosures are CE compliant which is a major benefit compared to alternative bespoke offerings. Careful attention has been given to power distribution with a range of redundancy and backup options to provide a high degree of fault tolerance.

Enclosures may accommodate a T1500 panel workstation on the front door as a local operator interface and up to six T640 Controllers.

I/O Terminations
Connection between the T103 input/output modules and the termination assemblies is by color coded multi-core flat cables with plug on connector. The termination assemblies provide wiring for transmitter and contact wetting supplies, as well as fuses or test disconnect jumpers and plug in relays for digital outputs.

High Integrity Power Supply System
All main control units are powered by 24V dc for simplicity and safety. With an ac mains primary supply the 24V dc is provided by a module assembly comprising several PSUs with a �1 for N� redundancy option; if any power supply fails then the load is provided by the remaining ones. A secondary dc supply may be used as backup. An auxiliary mains supply can be used for the internal fan (and light, if fitted) if the primary supply is dc.

Control unit memory is protected against loss of power by a RAM backup battery option and charger.

Network Connections
Internal communications is via ALIN which may be connected in a bussed or star configuration, the latter using a passive hub. The simple bus connection may be used for direct external communication up to a 100m total length. Both bussed and star connected systems may be connected via T221 bridges to a LIN network which may run up to 1000m. A bussed ALIN electrical segment supports a total of 16 nodes including external workstations etc. An active hub then allows ALIN expansion either via twisted pair cables or fiber-optic. A passive hub based cabinet with star connection supports up to 12 nodes internally, including T221 bridge and test points.

Communications wiring is via a feed-through connector on a dedicated gland plate for floor standing versions.

System Availability
High availability of the control system is assured by the fundamental reliability of the Control units and redundant CPU options, plus the following features built into the enclosure design:

Optional redundant power supplies with additional standby input
Live replacement of all active components, including relays
Extensive health monitoring and diagnostics with indicator LEDs/watchdog relays
ALIN integrity enhanced by optional passive hub with up to 12 network drops protected against short circuit on any line
Dual T221 bridges for redundant LIN connection, or dual active hub for connection to dual server-workstation

Components
Power supply and auxiliary components are either bulkhead or DIN rail mounting and may be supplied without the enclosure to system integrators and customers with specific installation requirements.

Documentation
The cabinets are supplied with standard drawings available on
paper or disk in AutoCAD format.

Customized Enclosures
Enclosures may be customized to accommodate additional equipment or variants in wiring standards but this will require a specific quotation and incur an engineering charge.

Support Services
Eurotherm Process Automation Customer Services Department offers a variety of on site support services, including verification of network wiring and assistance with commissioning.

Last Updated Thursday, September 01, 2005