EM500 Open-Loop Vector Control Inverter User Manual shall not be longer than once every 30 minutes. Inverter will not automatically start after power failure. 3.2.5.4Connection to Terminal Block Input power can be connected to R, S and T randomly irrespective of their phase sequence on the terminal block. 3.2.5.5AC Reactor Installation Excessive surge current may be generated when 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 inverter, which not only suppresses peak current and voltage, but also improves the power factors of system. 3.2.5.6Surge Suppressor Installation It’s required to install a surge suppressor, if there is an inductive load near inverter, for example electromagnetic contactor, solenoid valve, solenoid coil and electromagnetic circuit breaker. 3.2.5.7Noise Filter Installation at Power Supply Side A noise filter can filter the noise transmitted between power cable and inverter and the impacts of the noise generated by inverter on the power grid.
A special noise filter is required for an inverter; a general noise filter is not adopted usually for performance purpose. Correct and incorrect installation methods of a noise filter are shown in Figure 3–6 and Figure 3–7. MCCB IM EMC 其它控 制设备 Other Control Device Figure 3–6 Correct Installation of Noise Filter 41 专Spe用cial噪 No声ise 滤F波ilter器 EEMM650000 变In频vert器er