DTA04 Motor thermistor relay Benefits High operating safety. The thresholds are determined by the Motor PTC. Beyond the specified temperature the output stops the motor/s. Save time and costs.There is no need to connect other additional and expensive controllers. Ensure continuous production process in your plant. This type of controller allows limitation of false alarms which may be the cause of useless interruptions of production systems. Two outputs. The 2 ouputs provide, besides interrupting the the Motor supply, an additional signal for a lamp, PC or PLC. Bi-colour front LED. These devices indicate alarms for temperature and PTC. Description DTA04 is a motor thermistor monitoring relay. Through the motor internal PTC or PTCs the DTA detects when one or more motor windings are exceeding the maximum operating winding temperature. The PTC type installed in the motor is different according to the motor insulation temperature. The temperature triggering threshold is detemined by the PTC Type. The relay is equipped with 2 outputs which operate in a complementary mode. The DTA04 can be set to operate as MANUAL or AUTO reset. When set to manual, the front LED will notify when the motor temperature is back to normal avoiding to try to restore operation uselessly. Applications This product is extremely suitable for pumps temperature monitoring. It can be useful in all applications where motors are used especially where overloads are frequent and may cause motor damages: pumping stations, water treatment, conveyors, material handling, HVAC, chillers. etc. 19/09/2017 DTA04 DS ENG Carlo Gavazzi Controls S.p.A. 1DTA04 Structure F A G B C D E A G F Element Component Function A1 ( + or L ) A Power Supply terminals A2 ( - or N ) B PTC input Up to 6 PTCs in series can be connected When no overtemperature alarm is present, this double func- tion pusbutton, operates as TEST by simulating the PTC over- temperature: motor stops as long as pushbutton is pressed, as soon as pushbutton is released the normal operation is re- C TEST / RESET pushbutton stored. The pushbutton operates as RESET when the motor had been stopped by overtemperature, the setting is for MANUAL reset and the LED shows theReady for rese situation. Green ON steady: no alarm Red ON steady: over-temperature alarm D Information LED Fast Red blinking: open circuit PTC Slow Red blinking: short-circuit Red and Green alternate: ready for reset E Remote RESET pushbutton terminals To configure the device as Autoreset they shall be jumpered SPST electromechanical relay. During normal operation the F Output 1 terminals conctact is closed, it opens when an alarm is triggered SPST Electromechanical relay. Normally open contact, it clos- G Output 2 terminals es when an alarm is triggered 19/09/2017 DTA04 DS ENG Carlo Gavazzi Controls S.p.A. 2