• 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.
• Connect to the power supply via a molded case circuit breaker or earth leakage circuit breaker (with
overcurrent protection function) for each inverter. Use the recommended molded case circuit breaker or
earth leakage circuit breaker, and do not use devices that exceed the recommended capacity.
• Be sure to use the specified wire size.
• Tighten terminals with the prescribed tightening torque.
• If there are multiple inverter and motor combinations, do not use multi-core cables for the purpose of
bundling and storing wiring for multiple combinations.
• Do not install a surge suppressor to the inverter output side (secondary side).
• Be sure to connect an optional DC reactor (DCR) when the capacity of the power supply transformer
exceeds 500 kVA, and is at least 10 times the inverter rated capacity.
Failure to observe this could result in fire.
• Ground the inverter in compliance with the national or local electric code.
• Be sure to ground the inverter ground terminal [*G] grounding wire.
Failure to observe this could result in electric shock or fire.
• Wiring work should be carried out by qualified professionals.
• Carry out wiring work after ensuring that the power has been turned OFF.
Failure to observe this could result in electric shock.
• Always carry out wiring after installing the unit.
Failure to observe this could result in electric shock or injury.
• Ensure that the number of phases and rated voltage of the product input power supply matches that for the
connected power supply.
• Do not connect the power lines to the inverter output terminals (U, V, W).
• When connecting a DC braking resistor (DBR), never connect it to terminals other than terminals P(+) and
DB.
Failure to observe this could result in fire or an accident.
• Control signal lines generally do not have a reinforced insulation coating, and therefore if control signal lines
come into contact with live parts of the main circuit, the insulation coating may be damaged for some
reason. In such a case, there is a danger that high voltage from the main circuit will be applied to the control
signal lines, and therefore care should be taken to ensure that they do not come into contact with live parts
of the main circuit.
Failure to observe this could result in an accident or electric shock.
• Switch all switches after first waiting 5 minutes or longer for units of FRN0115G2S-2G/FRN0060G2□-4G or
lower, or 10 minutes or longer for units of FRN0146G2S-2G/FRN0075G2□-4G or Higher after turning OFF
the power, ensuring that the LED monitor and charge lamp are OFF, and use a device such as a tester to
ensure that the DC intermediate circuit voltage across main circuit terminals P(+) and N(-) has dropped to a
safe level (+25 VDC or less).
Failure to observe this could result in electric shock.
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