Deltat Setpoint Value Calculation - JUMO mTRON T Operating Manual

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3 Configuration

3.8.3

DeltaT setpoint value calculation

With deltaT cooking, the setpoint value (chamber temperature) is continuously adapted to the

actual value (core temperature) throughout the entire program section. So a constant differ-

ence between the two temperatures is maintained (deltaT value). The process technology ap-

plication provides the deltaT setpoint value calculation.

For the deltaT setpoint value calculation, a setpoint value track (setpoint value 1 to 8) of the

programmer generator is used. The user specifies a fixed setpoint value, which serves as the

deltaT value. This is added to an analog signal (actual value) in the PLC and issued as the set-

point value.

The section changeover is not part of the deltaT setpoint value calculation, but can be corre-

spondingly configured via the PLC configuration.

The following settings are required for PLC configuration:

•

Actual value (parameter 7): select analog signal to supply the actual value.

•

Setpoint value track (parameter 8): select number of the setpoint value to be used to set the

deltaT value and to issue the calculated setpoint value.

The deltaT value is specified by the user in the program. The output of the program gener-

ator supplies the setpoint value calculated by the PLC.

If 0 is entered as the setpoint value number, the deltaT setpoint value calculation is deacti-

vated.

CPU > Configuration level > PLC configuration

In this example, input 3 (AI03) of the 4-channel analog input module (Analog In 4x) will be used

as the actual value (P1 X deltaT).

Setpoint value 8 is selected (value = 8) as setpoint value track (P1 Setpoint no. deltaT).

NOTE!

In a process, it may be necessary to switch the setpoint value of the controller. If switching

between the deltaT setpoint value and the fixed setpoint value, for example when deltaT

cooking, this can be done dependent on the process step. For this, the setpoint changeover

of the multi-channel controller module has to be controlled by a process contact of the pro-

cess step.

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