INT69 Diagnose, discharge

• Article No.

  22 A 481

• Application

  The INT69 Diagnose motor protector is an upgraded version of the proven KRIWAN compressor protection units with an additional input for a discharge gas sensor. Its additional flexible-response protective functions can extend the service life of a cooling system. The comprehensive diagnostics and data storage functions help to identify the causes of possible malfunctions quickly and reliably.

• Functional description

  The temperature monitoring of the motor is done with two evaluation methodes: • Static: If the temperature increases slowly in the motor winding, the motor is switched off immediately when the rated nominal response temperatures of the built-in PTC sensors is reached. • Dynamic: If the temperature increases unusually quickly in the motor winding, the motor is switched off immediately even if the temperature is still far below the rated nominal response temperatures of the built-in PTC sensors. This prevents high temperature overshoot. The temperature monitoring of the discharge gas sensors uses a static evaluation process. The following other errors result in a motor shut-down: • Short circuit at the PTC inputs • Contactor chatter (switching frequency limitation) The motor is restarted with a restart delay after it has cooled down or the error has been repaired. The INT69 Diagnose compressor protection unit automatically saves operational and error data in a non-volatile memory. This data can be retrieved on a PC as needed and analyzed for diagnose. The full scope of the diagnose is achieved by using a KRIWAN-specific AMS sensor, consisting of several PTC sensors with different rated shut-off temperatures. Among other data, the operating times in each temperature range of the motor winding are recorded.