The 200A DC Contactor manufacturer tells you that when the electromagnetic contactor is replaced by a frequency converter, since the start and stop of the asynchronous motor are controlled by the control end of the frequency converter, the electromagnetic contactor DC contactor is not required during normal operation. However, in order to cut off the inverter power supply when the inverter fails, a magnetic contactor is required. The 200A DC Contactor manufacturer tells you that if a braking resistor is used, a DC contactor is also required. 200A DC Contactor manufacturers tell you that if the brake circuit transistor fails, a large current will continue to flow through the brake resistor, so if the circuit is not cut off as soon as possible, the brake resistor with short-time rated characteristics will burn out.

The 200A DC Contactor manufacturer tells you that in this case the signal from the overload relay mounted on the brake resistor can be used to release the DC contactor to protect the brake resistor. When choosing a DC contactor, pay attention to the capacity. The rated current is greater than the input current value of the inverter.
200A DC Contactor manufacturers tell you that since universal motors are designed on the premise of being driven by grid power, they can be driven continuously for a long time under grid-driven conditions. However, if these general-purpose motors are changed to use frequency converters to run continuously, due to the influence of harmonics, the motors will run at speeds lower than the rated speed and current, which is difficult to meet the requirements and to be cooled by fans. 200A DC Contactor manufacturers tell you that the inverter output is less than the rated current. 200A DC Contactor manufacturers tell you that especially when the load is a constant torque load, even if the motor speed is lower than the rated speed, the motor current is basically the same as the rated current. If the motor temperature rise is greater than the rated speed grid power drive unit, the motor may burn out. Therefore, when the motor runs continuously in the low-speed area, the DC contactor selected for protection according to the rated current of the motor cannot protect the motor, so attention must be paid when determining the DC contactor.