2.2 Cable Wiring
Open the front cover, remove the cable guides and control terminal cover, and then install the
ground connection as specified. Complete the cable connections by connecting an appropriately
rated cable to the terminals on the power and control terminal blocks.
Read the following information carefully before carrying out wiring connections to the inverter. All
warning instructions must be followed.
• Install the inverter before carrying out wiring connections.
• Ensure that no small metal debris, such as wire cut-offs, remain inside the inverter. Metal debris in
the inverter may cause inverter failure.
• Tighten terminal screws to their specified torque. Loose terminal block screws may allow the cables
to disconnect and cause short circuit or inverter failure. Refer to 9.6 Terminal Screw Specification on
page 254 for torque specifications.
• Do not place heavy objects on top of electric cables. Heavy objects may damage the cable and
result in electric shock.
• The power supply system for this equipment (inverter) is a grounded system. Only use a grounded
power supply system for this equipment (inverter). Do not use a TT, TN, IT, or corner grounded
system with the inverter.
• The equipment may generate direct current in the protective ground wire. When installing the
residual current device (RCD) or residual current monitoring (RCM), only Type B RCDs and RCMs can
be used.
• Use cables with the largest cross-sectional area, appropriate for power terminal wiring, to ensure
that voltage drop does not exceed 2%.
• Use copper cables rated at 600 V, 75℃ for power terminal wiring.
• Use copper cables rated at 300 V, 75℃ for control terminal wiring.
• Separate control circuit wires from the main sircuits and other high voltage circuits(200V relay
sequence circuit).
• Check for short circuits or wiring failure in the control circuit. They could cause system failure or
device malfunction.
• Use shielded cables when wiring the control circuit. Failure to do so may cause malfunction due to
interference. If a ground is needed, use STP (Shielded Twisted Pair) cables.
• If you need to re-wire the terminals due to wiring-related faults, ensure that the inverter keypad
display is turned off and the charge lamp under the front cover is off before working on wiring
connections. The inverter may hold a high voltage electric charge long after the power supply has
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