User Manual of EM730 Series Inverter Fig.3-4 Connection of Input Circuit Breaker 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 30 mA. If an ordinary leakage circuit breaker is used, use a leakage circuit breaker with the current sensitivity above 200 mA and action time of more than 0.1 s. 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 electromagnetic contactor on the incoming line side must not exceed once every 30 min. After the power supply is restored, the inverter will not run automatically. Connection with terminal block block, so that the terminals of the input power supply can be connected arbitrarily.
The phase sequence of the input power supply is unrelated to that (R, S, T) of the terminal Installation of AC reactor When a large-capacity (above 600KVA) power transformer is connected, or the input power supply is connected to a capacitive load, a high inrush current will be generated, which 35