Appendix2 Operating the Inverter Using a Single-Phase
If a single-phase power supply is used to operate the inverter only 4 of the 6 of the diodes will be used.
Therefore the ripple current of the capacitor will increase when compared to operation from a three-phase
power supply, resulting in a higher temperature rise of the converter and the capacitor. Operating the inverter
using a single-phase power supply requies derating of the output current.
• Rating for inverter operation using single-phase power supply
Voltage (Note 1)
Rated input AC current (A) (Single
Rated input AC voltage
Power supply system capacty (kVA)
(Note 1) The maximum output voltage cannot exceed the power supply voltage. The maximum output
voltage may be set as desired below supply voltage.
(Note 2) The power supply capacity changes with the values of power supply side inverter impedance
(including those of the input reactor and cables).
• Cautions on operating the inverter using single-phase power supply
(1) Connect the single-phase power supply to the terminals R and S of the inverter.
(2) If the capacity of the power supply is insufficient, the output voltage will become unstable under
changing load conditions. Therefore, be certain the power supply is adequate.
Note: Only the NA version A500 is UL listed for the above single-phase ratings.
The A500 inverter is not CE marked for single-phase operation. The A500 is not EMC compliant for
AC200 - 220V 50Hz
AC200 - 240V 60Hz
Three phase, 200 to 220V 50Hz, 200 to 240V 60Hz
Single phase, 200 to 220V 50Hz, 200 to 240V 60Hz