2-16
îš‹ Wiring the Main Circuits
This section describes wiring connections for the main circuit inputs and outputs.
îš„Wiring Main Circuit Inputs
Observe the following precautions for wiring the main circuit power supply inputs.
Installing a Molded-case Circuit Breaker
Always 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 at
150% 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 the
power supply will be turned OFF by a fault output, as shown in Fig 2.6.
Fig 2.6 MCCB Installation
Installing a Ground Fault Interrupter
Inverter outputs use high-speed switching, so high-frequency leakage current is generated. At the Inverter pri-
mary side, use a ground fault interrupter for Inverters with a countermeasure against high frequency to detect
only the leakage current in the frequency range that is hazardous to humans and to ignore high-frequency leak-
age current. Use one or several ground fault interrupters with a total cumulative sensitivity amperage of at
least 30 mA per Inverter.
Using a ground fault interrupter without a countermeasure against high frequency may result in a malfunction
caused by high-frequency leakage current. If a ground fault interrupter without a countermeasure malfunc-
tions, replace it with a ground fault interrupter with a countermeasure against high frequency or reduce the
carrier frequency of the Inverter. Alternatively, use one or several ground fault interrupters with a total cumu-
lative sensitivity amperage of at least 200 mA per Inverter.
* For 400 V Class Inverters, connect a 400/200 V transformer.
Power
supply
Inverter
Fault output
(NC)
R/L1
S/L2
T/L3
20P4 to 2030: 3-phase,
200 to 240 VAC, 50/60 Hz
2037 to 2110: 3-phase,
200 to 230 VAC, 50/60 Hz
40P4 to 4300: 3-phase,
380 to 460 VAC, 50/60 Hz
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