EM630/TC6A Closed-Loop Vector Hoist Inverter User Manual 3.2.5.2 Leakage Circuit Breaker Installation The inverter outputs high-frequency PWM signals, which generate high-frequency leakage current. Please select a leakage circuit breaker with a trigger current ≥ 30mA. For a regular circuit breaker, the trigger current ≥ 200mA and the active time at 0.1 s or above. 3.2.5.3 Electromagnetic Contactor Installation Connect the electromagnetic contactor corresponding to the inverter power as shown in Figure 3–4. Do not control the start or stop of the inverter with the electromagnetic contactor on the input side. Frequent use of this method is an important cause of damaging the inverter.
The operation interval between start and stop of the inverter shall not be longer than once every 30 minutes. The inverter will not automatically start after power failure. 3.2.5.4 Connection to Terminal Block The input power can be connected to R, S and T randomly irrespective of their phase sequence on the terminal block. 3.2.5.5 AC Reactor Installation Excessive surge current may be generated if the inverter is connected to a large capacity (over 600KVA) power transformer or the input power supply is connected to a capacitive load, and this may damage the rectifier.
Connect a 3-phase AC reactor (optional) to the input side of the inverter, which not only suppresses peak current and voltage, but also improves the power factors of system. 3.2.5.6 Surge Suppressor Installation It’s required to install a surge suppressor, if there is an inductive load near the inverter, for example electromagnetic contactor, solenoid valve, solenoid coil and electromagnetic circuit breaker. 3.2.5.7 Noise Filter Installation at Power Supply Side A noise filter may filter the noise transmitted between the power cable and the inverter and the impacts of the noise generated by the inverter on the power grid.
A special noise filter is required for an inverter; a general noise filter is not adopted for effect purpose. 33