Wiring Main Circuit Terminals2- 15 Wiring the Main CircuitsThis section describes wiring connections for the main circuit inputs and outputs.Wiring Main Circuit InputsObserve the following precautions for wiring the main circuit power supply inputs.Installing a Molded-case Circuit BreakerAlways connect the power input terminals (R, S, and T) and power supply via a molded-case circuit breaker(MCCB) suitable for the Inverter.• Choose an MCCB with a capacity of 1.5 to 2 times the Inverter's rated current.• For the MCCB's time characteristics, be sure to consider the Inverter's overload protection (one minute at150% of the rated output current).• If the same MCCB is to be used for more than one Inverter, or other devices, set up a sequence so that thepower supply will be turned OFF by a fault output, as shown in Fig 2.6.Fig 2.6 MCCB InstallationInstalling a Ground Fault InterrupterInverter outputs use high-speed switching, so high-frequency leakage current is generated. Therefore, at theInverter primary side, use a ground fault interrupter to detect only the leakage current in the frequency rangethat is hazardous to humans and exclude high-frequency leakage current.• For the special-purpose ground fault interrupter for Inverters, choose a ground fault interrupter with a sen-sitivity amperage of at least 30 mA per Inverter.• When using a general ground fault interrupter, choose a ground fault interrupter with a sensitivity amper-age of 200 mA or more per Inverter and with an operating time of 0.1 s or more.* For 400 V Class Inverters, connect a 400/200 V transformer.20P4 to 2030: 3-phase,200 to 240 VAC, 50/60 Hz2037 to 2110: 3-phase,200 to 230 VAC, 50/60 Hz40P4 to 4300: 3-phase,380 to 460 VAC, 50/60 HzPowersupplyInverterFault output(NC)
