Installation and heat dissipation of Bonfiglioli Vectron cold plate frequency converter

Temperature monitoring and protection configuration

The frequency converter is equipped with a built-in thermistor to monitor the temperature of the cold plate (sensor) and the internal air temperature. During operation, the actual value menu can read these two temperatures. To avoid overheating and tripping, users can set an alarm threshold (parameter "Alarm limit"), which defaults to the maximum allowable temperature minus 5 ° C. For example, if the maximum temperature for a low-power cold plate is 75 ° C, the alarm threshold is 70 ° C. When the temperature reaches 70 ° C, the panel displays "Warning" and the red LED flashes, and a warning signal can be sent through digital output.

Power on/off protection value (cannot be changed):

When the temperature of the cold plate is ≥ 80 ° C, the frequency converter will immediately shut down due to malfunction (free parking or deceleration parking depends on the configuration);

When the internal air temperature is ≥ 65 ° C, a fault is also triggered.

Therefore, when designing a heat dissipation system, it is necessary to ensure that the temperature of the cold plate during steady-state operation is below 70-75 ° C (depending on power), with margin left. If the ambient temperature is high, the required thermal resistance should be recalculated and a larger radiator or additional air/liquid cooling should be selected.

Precautions for Engineering Practice

Internal dissipation cannot be ignored: Pv_int in the table represents the heat generated inside the frequency converter (control board, drive circuit, etc.), which will be dissipated into the air of the cabinet, accounting for about 30% of the total fixed dissipation. When designing cabinet ventilation or air conditioning, this heat should be included in the total heat load.