2 Design
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High-function General-purpose Inverter RX2 Series User’s Manual
Configuration diagram and functions of the inverter and main circuit peripheral are described below:
Precautions for Correct Use
• Those devices are only applicable in case the standard 3-phase induction motor with four
poles.
• Breakers must be selected in consideration of break capacity.
(Use a type applicable for inverter)
• Use an earth-leakage breaker (ELB) for your safety.
• Use a 75°C heatproof copper wire (HIV wire).
• If the wiring length exceeds 20 meters, heavier power lines need to be applied.
• Select for alarm output contact of 0.75 mm
2
.
• Tighten the terminal screws at a specified torque. If they are not tightened enough, it may
cause short circuit or fire. If they are tightened too much, it may damage the terminal block or
inverter.
• Select variable sensitive currents for earth-leakage breaker (ELB) depending on the total
wire length between the inverter and power supply and between the inverter and motor.
Select a time-delay type of earth-leakage breaker. Otherwise a high-speed inverter may mal-
function.
• When wiring a CV line in a metal pipe, leak current is approximately 30 mA/km.
• Because the relative permittivity of IV wire is high, the current increases by about eight times.
Therefore, use an item with 8 times sensitive current that is shown on the table below. In
case the total length of wire exceeds 100 meters, use a CV wire.
2-3-4 Wiring for Main Circuit Terminals
Outline of Applicable Peripheral Devices
Total wiring length Sensitive current (mA)
100 m or shorter 50
300 m or shorter 100
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