T630 Process Data Controller

Eurotherm has re-invented the Process Controller by taking the widely-acclaimed features of the 6350/60 product range – 100,000 units sold since 1980 – and implementing them using state-of-the-art technology and styling, setting new standards of performance and flexibility combined with ease of use, at a price anyone can afford.

T630 is designed to fit into existing panel cutouts as well as new panels requiring traditional loop integrity with the benefit of industry-standard communications for integration into a supervisory control environment. With a choice of dual-loop cascade as well as single loop or ratio control algorithms, the T630 will actually save panel space in retrofit situations Output bargraph by replacing two or even three existing units. Needless to say, the expansion I/O card allows full handshaking and bumpless transfer when separate units are connected in cascade or in master-slave configuration.

The Operator interface is a model of clarity, recalling the classic TCS look while adopting modern standards and display technology, using a custom display that maximises readability.

It will appeal as much to OEMs and System Integrators as End-Users, thanks to its ease of use and limited hardware variants — a single I/Ohardware variants — a single I/O expansion card and a second slot for communications minimises spares holding. Parameterisation is intuitive, thanks to the alphanumeric display used for messages, and a clear, concise manual guides the user and provides further explanation. Commissioning engineers will appreciate the standard Autotune feature.

APPLICATIONS
The T630 is designed for control of standard process variables — Temperature, Flow, Pressure, etc — in applications such as industrial boilers, furnaces, kilns, reactors and mixing vessels; in fact any application where high integrity process control is required.

The communications options make the T630 ideally suited for frontend PID control where the logic and coordination is carried out in a DCS or PLC.

Single loop control
A simple single loop process controller algorithm can be achieved with the basic I/O board only. Use of a hardwired remote setpoint requires the Expansion I/O board, which also provides the necessary analogue and digital I/O for interlocking between separate master and slave units so as to assure bumpless transfers. Alternatively the setpoint trim input allows offset of the process variable in furnace applications etc.

Incremental output
For single loop, dual loop cascade and ratio control, incremental (raise/lower) outputs for the control of fixed speed bi-directional motors are available. The algorithm provides raise and lower output pulses and compensation for both motor inertia and backlash. Position feedback display is available if required. The expansion I/O card is required and outputs are allocated as shown.

Override control
Override control allows a secondary loop to take over the main control output in order to prevent an undesirable operating condition, for example in flow control with pressure override. The two PID algorithms drive a single control output via a low signal selector.

ALARM HANDLING
The basic controller has both a watchdog relay output and a relay for process alarms. Use of the Expansion I/O board provides additional high and low alarm outputs. Process alarms are indicated by flashing of the loop 1 and loop 2 alarm LEDs on the front panel. Unacknowledged absolute and deviation alarms cause flashing of the PV and SP bargraphs respectively. Alarms may be acknowledged by pushbutton for the current loop, and the alarm acknowledge status is also accessible via the communications.

CONTROL CONFIGURATIONS
The basic input/output set allows for a single process input (with integral transmitter supply) and a single process output, both isolated. Two relays are provided for watchdog and process alarm. An expansion I/O card provides a second process input with transmitter PSU, a further analogue input and one analogue output. These may be connected in various ways to the available internal parameters such as remote setpoint, track, retransmitted process variable etc. More flexibility is provided by four digital inputs and four digital outputs which may be connected to mode enable and alarm/status fields respectively. All such parameters and status fields may be modified from the front panel or a supervisory computer when not connected to the I/O terminals.

Ratio control
The ratio controller implementation allows the controlled variable to follow an external input at a set ratio. The ratio setpoint and control PV are viewed in loop 1 while the ratio PV and the setpoint in engineering terms may be viewed in loop 2.

Dual loop cascade control
A classical two loop cascade pair with full bumpless, procedureless auto/manual/remote switching. All necessary interlocks are made internally so that wiring and configuration are very simple.

Manual station
The Manual Station acts as the output device to an externally implemented control loop or simply as a manual loader. When used with an external control signal, the unit may be switched into local manual either by the operator or, automatically on failure of the external system.

‘ITOOLS’ THE CONFIGURATOR

• On-line and off-line configuration
• Cloning, File Load, Save and Copy
• Application Documentation HTML or CSV format
• OPC client/server
• OPC Scope commissioning utility

What does it do?
'iTools' is used to set up the type, range, linearisation and scaling of analogue inputs, the PID control type and parameters and all other functions and features within the T630.

Trending How do I use it?
Simply plug the configuration cable into the RJ11 socket on the T630 module. Let 'iTools' scan for the device. The module can then be put into configuration mode. Simply click on the explorer 'folder' to select a parameter page, then click the parameter you wish to edit. A select list will appear for the variable, either a helpful multi choice, pick list or numeric data entry box will pop up.

How many values can I select?
Every parameter can be selected and may be set as required.

How do I save and document my configuration?
Once the T630 configuration has been completed then the application can be saved as a 'clone' file for repeat application. Clone files can be loaded, copied, saved and edited both on and off line.