If '1999' flashes, this means that either no measurable signal is
present (probe break) or the configuration under C111 is incorrect.
1. Check the measurement signal (resistance measurement, current/voltage
measurement), if necessary, define values using a signal source.
2. Check configuration code C111 (default setting Pt100, Chapter 7.1 of the Operating Instructions).
On a standard universal input (resistance thermometer, thermocouple, current) the solder links S101 and S102 on the CPU board are assigned as follows:
If input 1 has to operate off 0 - 10 V (other signals are then no longer possible!), the solder links on the CPU board must be changed as follows:
Assignment of links for input signal 0 - 10V for input 1:
A PC setup program for configuring the controller from a PC is available for the dTRON 16.1. As well as the PC program, JUMO Part No. 70/00400027, you will need an interface cable with a special adapter for the dTRON 16.1. The JUMO Part No. for the interface cable is 70/00400821.
The analog output (output 3) is an optional output and is not fitted in the standard instrument. If the output has been included in the order, then the output signal can be changed between current and voltage by means of solder links on the output board. The signal start 0 or 2 V, or 0 or 4 mA, is set at the configuration level C 114.
It can be seen from the type designation whether a dTRON 16.1 with an analog output has been supplied. Please refer to the operating instructions, chapter 2 “Identifying the instrument version”.
The following two solder links on the analog output board must be altered accordingly when changing between current and voltage signal:
| Output signal range | Solder link S 602 (S1) | Solder link S 602 (S2) |
| 0/4 - 20 mA | open | open |
| 0/2 - 10 V | closed | closed |
Depending on the selected controller type, the following parameters are determined through autotuning:
| Controller type | Parameter |
| 2-state controller ON/OFF function | Pb1, dt, rt, Cy1, df |
| 3-state controller | Pb1, Pb2, dt, rt, Cy1, Cy2, df |
| Proportional controller | Pb1, dt, rt, df |
As soon as autotuning is started from the “Exit“ key (hold down for 2 sec), the controller attempts to determine the time response of the process by applying step changes in the manipulating variable. Autotuning evaluates the development of the process value resulting from these changes in the manipulating variable and calculates the controller parameters. During autotuning, you will see “ tune “ flashing in the bottom display.
On termination of the autotuning procedure, “ tune “ ceases to flash.
The duration of the autotuning procedure depends on the time response of the controlled process. If the process reacts relatively quickly to the changes in manipulating variable, then autotuning may be over in a matter of seconds or minutes. With slow processes, autotuning may take half an hour or longer.
