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  • Max. two programmable analog inputs
  • Four programmable setpoints, two parameter sets
  • Program function with 8 segments, or ramp function
  • Math and logic module
  • 4 limit comparators
  • Two timer functions
  • Two self-optimization procedures
  • Fast, user-friendly configuration through the setup program with program editor
  • RS422/485 interface
  • PROFIBUS-DP interface

The JUMO dTRON 300 series of process controllers includes four freely programmable devices in different DIN formats for controlling temperature, pressure and other process variables. As a temperature controller (TR) according to EN 14597 the devices are used in heat-generating plants to control the temperature of liquids or gases (mode of action: 1B).

The high-contrast, multicolor LC display for process value, setpoint and operator prompting contains two four-digit 7-segment displays, two single-character 16-segment displays, display of the active setpoints, six switch position indicators, and displays for the dimensional unit, ramp function and manual operation.

Simple operation through 4 keys. The instruments can be used as 2-state, 3-state, modulating or continuous controllers. The controller software includes a program or ramp function, parameter set changeover, two autotuning (self-optimization) procedures, a math and logic module, as well as 4 limit comparators.

Linearizations for the usual transducers are stored, and a customer-specific linearization table can be programmed.

A setup program is available for user-friendly configuration from a PC. A serial interface for RS422/485 or Profibus-DP can be used to integrate the instruments into a data network.

The electrical connection is made at the back, via screw terminals. The possible input and output configurations are shown in the following block diagram. The option boards are universally applicable for all instruments in the series.

Standard features include the tried and tested self-optimization, which makes it possible for the controller to be matched to the control loop by a user who is not a control technology expert. This functions by evaluating the response of the control loop to specific changes in the manipulating variable. Either an oscillatory method or a step-response test can be selected. The step-response test is used, for example, in the plastics industry or in processes where the oscillatory method cannot be employed. The controller parameters that are calculated are: proportional band, reset time, derivative time, cycle time and filter time constant.

In addition to the linearizations for the usual transducers, a customer-specific linearization can also be created. The programming is carried out in the setup program, in the form of a table of values or a formula.

Parameters which are frequently changed by the user can be combined at the operating level under "User data" (only through the setup program).

The math module makes it possible to combine values such as the setpoints, output levels and measurements from the analog inputs into a mathematical formula. The logic module can be used, for instance, to make a logical combination of logic inputs and limit comparator states. Up to two math or logic formulae can be entered through the setup program, and the results of the calculations can be presented at the outputs or used for internal purposes.

The instrument can be operated as a differential, humidity or ratio controller.

Logic functions include:

  • Start/cancel self-optimization
  • Change to manual mode
  • Hold/cancel ramp
  • Controller off
  • Setpoint changeover
  • Parameter set switching
  • Key/level inhibit
  • Text display
  • Display off
  • Acknowledge limit comparators
  • Program start/hold/cancel
  • Timer start/stop

The logic functions can be combined with one another (only through the setup program).

Functions of the outputs

  • Analog input variables
  • Math
  • Process value
  • Setpoint
  • Ramp end value
  • Control deviation
  • Output level
  • Controller outputs
  • Limit comparators
  • Control contacts
  • Logic inputs
  • Logic formula
  • Program end
  • Timer signals
  • Program/automatic signal

Either a rising or a falling ramp function can be used (increase or decrease in the setpoint). The change in setpoint value SP at t0 is the final value for the ramp. The ramp starts with the setpoint at time t0. The slope of the ramp can be programmed; the sign (direction) of the slope is given by the relationship between the setpoint at time t0 and the SP value. When the supply voltage is switched on, the ramp function starts with the momentary process value.

Two timers are available for time-dependent control. The status of the timers can be switched through to the logic outputs or internally processed for the activation or deactivationof time-dependent processes.

The setup program for configuring the instrument is available in English, French and German. Using a PC, you can create and edit sets of data, and transfer them to the controller or read them out from the instrument. The data sets are stored and managed.