Frese ELCO-100 local controller quick guide: wiring a PT100 sensor or 4–20 mA transmitter and setting inputs, outputs, control mode and PI parameters.
This quick guide from Frese describes setting up the standalone ELCO-100 local controller. It shows the back-terminal wiring for a 3-wire PT100 sensor and for a 4–20 mA current-loop transmitter (0 to 100 °C) with a 24 VDC power supply, and identifies the front keys used to move through the menus.
The guide is built around worked menu examples: setting the analog input to 4…20 mA or to a 3-wire RTD probe with Pt100 linearization, selecting a 3-point step or continuous control type, setting the analog output to 4…20 mA, choosing control direction for heating or cooling, changing the PI controller parameters (Xp1, Tn1 and actuator time TT), and setting the serial interface address, baud rate and data format. A closing table lists 90° running times for 3-point actuators, followed by Frese office contact details.
| Analog input signal type | 4…20 mA or 3-wire RTD (Pt100) |
|---|---|
| Analog output signal type | 4…20 mA |
| Recommended proportional band Xp1 | 40 (lower to e.g. 30 if correction is too slow) |
| Recommended reset time Tn1 | 300 seconds; never lower than 100 seconds |
| Serial interface baud rate | 9600 |
| Serial interface data format | 8-1-even parity |
| Running time 90°, actuator 58-8936 | 17 s at 50 Hz / 14 s at 60 Hz |
The guide lists types 58-8965, 58-8966, 58-8967 and 58-8968 for the 4…20 mA setting.
In Configuration, open Analog input, change the signal type to 3w RTD temp probe, then set Linearization to Pt100.
Under Controller config, set Control direction to Direct for cooling; Inverse is the other setting described.
A proportional band Xp1 of around 40 and a reset time Tn1 of around 300 seconds are recommended.