User Manual of A90 Series Inverter 3.2.4 Input side wiring of main circuit 3.2.4.1 Installation of circuit breaker supply and input terminal. Install the air circuit breaker (MCCB) corresponding to the inverter between the power The MCCB capacity should be 1.5-2 times the rated current of the inverter. The time characteristics of the MCCB must meet the requirements for overheat protection (150% rated current/1 minute) of the inverter. When the MCCB is used with multiple inverters or other devices, connect the fault output relay contact of the inverter in series to the power contactor coil, as shown in Fig. 3, to disconnect the power supply according to the fault signal.
MCCB R S Inverter T ON EB Fault relay contact OFF EC MC Fig. 3-4 Connection of Input Circuit Breaker 3.2.4.2 Installation of leakage circuit breaker Since the inverter outputs high-frequency PWM signals, a high-frequency leakage current will be generated. Please use the dedicated leakage circuit breaker with the current sensitivity above 30mA. If an ordinary leakage circuit breaker is used, use a leakage circuit breaker with the current sensitivity above 200mA and action time of more than 0.1s. 3.2.4.3 Installation of electromagnetic contactor Connect the electromagnetic contactor that matches the power of the inverter, as shown in Fig. 3-4.
Do not control the operation and stop of the inverter via the electromagnetic contactor on the incoming line side. Frequent use of this method is an important cause of damage to the inverter. The frequency of operation and stop of the 30 MC