2 Design
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High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
Inrush current flow when the inverter power supply is turned ON
When the inverter power supply is turned ON, the charging current, which is called inrush current, flows
in the main circuit board capacitor.
The table below shows the reference values at a power supply voltage of 240 V or 480 V when the
power supply impedance is low. Take this into consideration when selecting the inverter power supply.
• With a low-speed no-fuse breaker, an inrush current 10 times the rated current can flow for 20 ms.
• To turn ON the power supply for multiple inverters simultaneously, select a no-fuse breaker with a
20-ms allowable current greater than the total inrush current shown in the following table.
Main power supply phase loss and single-phase input
This inverter is designed for 3-phase power supply input. It cannot be used with a single-phase
power supply. Similarly, do not use the inverter in an input phase lost state of the 3-phase power
supply. Doing so may result in an inverter damage.
Be sure to check the wiring for the 3-phase power supply before using the inverter. Note that the
inverter operates without detecting a phase loss if it occurs in the phase S as shown below.
Even when the inverter is in an input phase lost state, built-in capacitors are charged, which may
result in an electric shock or injury.
Be sure to check the precautions provided in the Safety Information on page 2-3.
Power supply environment
In the following cases, the internal converter module (rectifier) may be damaged.
Take countermeasures such as installing an AC reactor on the main circuit input side of the inverter.
• The power supply voltage unbalance factor is 3% or more.
• The power supply capacity is at least 10 times larger than the inverter capacity and, at the same
time, 500 kVA or more.
• Rapid change in the power supply voltage occurs.
Example. When the phase advance capacitor is turned on/off, the inverter may detect an
overvoltage or the rectifier may be damaged.
3-phase 200-V class 3-phase 400-V class
3G3RX--V1
Inrush current value
(A0-P)
3G3RX--V1
Inrush current value
(A0-P)
A2004 to A2037 17 A4004 to A4037 15
A2055 to A2110 40 A4055 to A4110 29
A2150 to A2370 48 A4150 to A4370 34
A2450, A2550 87 A4450, A4550 57
B4750, B4900 113
B411L, B413K 226
Phase loss State
Phase R
The inverter does not operate.
Phase T
Phase S
The inverter operates independently.
Under this state, the inverter may cause an undervoltage or overvoltage trip, or could be
damaged.
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