Application Note: Powering Inverters from a DC Supply Please refer also to the Inverter Instruction Manual AN091802-1 Hitachi America, Ltd. © 2002 Hitachi America, Ltd.
Powering Inverters from DC It is possible to power inverters from a DC Power source, or to connect the DC Bus of multiple inverters together to achieve energy savings, since inverters in power driving mode can use power from those that are in regeneration mode. [1] Connection method There are several ways for DC bus connection of the inverters. (Examples of 3-phase 200V or 400V class inverter.
[2] DC voltage to be supplied Supplied DC voltage should be between the UV voltage and the OV voltage (or BRD ON level) of the inverter. Model name 200V class 400V class J300 200V class 400V class L100 200V class 400V class SJ100 200V class 400V class L300P 200V class 400V class SJ300 200V class 400V class UV level 140Vac ~ 160Vac 280Vac ~ 320Vac 140Vac ~ 160Vac 280Vac ~ 320Vac 190Vdc ± 10Vdc 395Vdc ± 20Vdc J100 Same as L100 BRD ON level (V-SET) +137.
Case 2 : DC Bus connected n parallel to a single AC-fed inverter Ø Pay attention to the selection of the main inverter (#1) because all the input current flows through the rectifier bridge of this inverter. (*2) AC power supply + INV #1 i M1 M1 Ø Need sufficient time for EEPROM to store the data. (Refer to Case 1) INV #2 Ø Use DC choke.
