User Manual EM303B General Purpose Inverter Start/stop of the inverter can be controlled by the electromagnetic contactor on input side. Inverter may break down if the electromagnetic contactor is on and off frequently. The operation interval between start and stop of the inverter shall ≥ 30 minutes. The inverter will not automatically start after power failure. Connecting to the Terminal Block Power input phase sequence is not related to the phase sequence of terminals R, S, and T on the terminal block, any two of them can be connected randomly.
Installing an AC Reactor If the inverter is connected to a transformer with big-capacity (≥600kVA), or power supply is connected to capacitive load, an excessive big surge current will occur and rectifier of inverter can be broken down. Install an optional 3-phase AC reactor on input side of inverter to suppress peak current and voltage, and improve power factor of the system. Installing a Surge Absorber Install a surge absorber for inductive loads (electromagnetic contactors, solenoid valves, solenoid coils, or electromagnetic circuit breakers) nearby the inverter.
Installing a Noise Filter on Power Supply Side To filter noise transmitted between power cable and the inverter, andthe harmonic distortion of power grid caused by the noise produced by the inverter. A special purpose noise filter is required for the inverter. Correct vs incorrect installations of noise filters as shown in Figure 3-6 and Figure 3-7. MCCB IM EMC Other Control Devices Figure 3-6 Correct Noise Filter Installation MCCB MCCB IM IM Other Control Devices (a) (b) Figure 3-7 Incorrect Noise Filter Installation 27 Special Purpose Noise Filter EM303B Inverter EM303B Inverter Regular Noise Filter EM303 Inverte B r Regular Noise Filter Other Control Devices