Digital temperature controller TR42AD

programmablefor transformersRS-485

Temperature Control Protection Relay with RS485 Modbus Communication Protection Relay for temperature applications TR-42 has been created as an accessory of main importance for resin or air insulated three-phase MT transformers, as protection against dangerous over temperatures on the insulating coil, on the winding and to manage the intervention of cooling fans. The temperature is detected by 3 or 4 temperature sensors Pt-100 DIN 43760, three of them are located in the transformer coils, the fourth on the core. Features • Display of the actual temperature of the 4 RTD • Display & storage of the highest temperature of each RTD • 3 programmable output contacts from 0° to 220°C level 1, level 2 and FAN control • Automatic and “Always ON” fan mode • Alarm of TR-42 failure or PT 100 disconnection • Automatic fan start every week (bearing protections) • Insulated RS-485 communication port (Model TR-42C1 only) Communication Communication capabilities are available in the TR- 42 connecting the RS-485 port in a network controlled by a supervisor device (PC). The protocol used is Modbus RTU. The connections have to be made with shielded twisted wires. Functions and Signals DISPLAY: On the display “TEMPERATURE °C” (3 digits) you can observe the value of the temperature and program the settings; through the display “SENSOR” (1 digit) you can see the corresponding Pt Channel. LED “SET/PROG”: If “on”, it indicates that the user is viewing the SET mode. If “flashing”, it means that the user is in the PROGRAM mode. LED “ °C MAX”: If “on”, it indicates that the user is in the °C MAX mode.