2-16
Wiring the Main Circuits
This section describes wiring connections for the main circuit inputs and outputs.
Wiring Main Circuit Inputs
Observe the following precautions for the main circuit power supply input.
Installing a Molded-case Circuit Breaker
Always connect the power input terminals (R/L1, S/L2, and T/L3) and power supply via a molded-case circuit
breaker (MCCB) suitable for the Drive.
• Choose an MCCB with a capacity of 1.5 to 2 times the Drive's rated current.
• For the MCCB's time characteristics, be sure to consider the Drive's overload protection (one minute at
150% of the rated output current).
• If the same MCCB is to be used for more than one Drive, or other devices, set up a sequence so that the
power supply will be turned OFF by a fault output, as shown in Fig 2.5.
Fig 2.5 MCCB Installation
Installing a Ground Fault Interrupter
Drive outputs use high-speed switching, so high-frequency leakage current is generated. Therefore, at the
Drive primary side, use a ground fault interrupter to detect only the leakage current in the frequency range that
is hazardous to humans and exclude high-frequency leakage current.
• For the special-purpose ground fault interrupter for Drives, choose a ground fault interrupter with a
sensitivity amperage of at least 30 mA per Drive.
• When using a general ground fault interrupter, choose a ground fault interrupter with a sensitivity
amperage of 200 mA or more per Drive and with an operating time of 0.1 s or more.
* For 380-480 V class Drives, connect a 460/230 V transformer.
Power
supply
Drive
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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