Safety precautions
iii
• Do not carry the inverter by holding the front cover.
Otherwise, an injury could occur due to a falling inverter.
• Prevent any foreign material (e.g., lint, wastepaper, chippage, dust, metal) from entering into the inside of
the inverter and/or adhering to the cooling fin.
• Use the specified screws when changing the installation legs.
Otherwise, a fire or accident could occur.
• Do not install and/or run an inverter with damaged exterior or internal parts.
Otherwise, a fire, accident, or injury could occur.
Cabling
• If no zero-phase current (earth leakage current) detective device such as a ground-fault relay is installed in
the upstream power supply line in order to avoid the entire power supply system's shutdown undesirable to
factory operation, install a residual-current-operated protective device (RCD)/earth leakage circuit breaker
(ELCB) individually to inverters to break the individual inverter power supply lines only.
• Insert an MCCB or RCD/ELCB (with overcurrent protection) recommended for each inverter for its input
circuits. Use a recommended MCCB or RCD/ELCB and do not use a device which exceeds the
recommended capacity.
• Be sure to use wires of the specified sizes.
• Tighten the terminals with the specified torque.
• When using multiple combinations of inverters and motors, do not use multi-core cables to accommodate
multiple combinations of cables.
• Do not install any surge killer in the inverter's output (secondary) lines.
• Use an optional DCR when the capacity of the power supply transformer exceeds 500 kVA and is 10 times
or more the inverter rated capacity.
Otherwise, a fire could occur.
• Implement the Class C or Class D grounding work depending on the input voltage system of the inverter.
• Be sure to ground the grounding wire of the inverter [
G].
Otherwise, an electric shock or fire could occur.
• Cabling must be done by a qualified expert after installing the inverter with its power disconnected.
Otherwise, an electric shock or injury could occur.
• Make sure that the number of phases and rated voltage match those of the connected power supply.
• Do not connect the power supply line to the inverter output terminals ([U], [V], and [W]).
• When connecting a braking resistor, be sure to connect it to the P(+)-DB terminal.
Otherwise, a fire or accident could occur.
• Generally, reinforced insulation is not applied to the insulation sheath of control signal lines. Therefore, if a
control signal line should touch the main circuit where electricity exists, its insulation sheath may get broken.
This may result in applying the high voltage of the main circuit to the control signal line. Make sure that no
control signal line touches the main circuit where electricity exists.
Otherwise, an accident or electrical shock could occur.
• Before changing the switches or touching the control circuit terminal symbol plate, turn OFF the power and
wait at least five minutes for inverters with a capacity of 22 kW or below, or at least ten minutes for inverters
with a capacity of 30 kW or above. Make sure that the LED monitor and charging lamp are turned OFF.
Further, make sure, using a multimeter or a similar instrument, that the DC link bus voltage between the
terminals P(+) and N(-) has dropped to the safe level (+25 VDC or below).
Otherwise, an electric shock could occur.
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