v
• Do not turn the main circuit power on or off in order to start or stop inverter operation.
Doing so could cause failure.
• Do not touch the heat sink or braking resistor because they become very hot.
Doing so could cause burns.
• Setting the inverter to high speeds is easy. Before changing the frequency (speed) setting,
check the specifications of the motor and machinery.
• The brake function of the inverter does not provide mechanical holding means.
Injuries could occur.
Installation and wiring of an option card
• Before installing an RS485 Communications Card, turn off the power, wait more than five
minutes, and make sure, using a circuit tester or a similar instrument, that the DC link
circuit voltage between the terminals P (+) and N (-) has dropped below a safe voltage
(+25 VDC).
• Do not remove the terminal cover for the control circuits while power is applied, because
high voltage lines exist on the RS485 Communications Card.
Failure to observe these precautions could cause electric shock.
• In general, sheaths and covers of the control signal cables and wires are not specifically
designed to withstand a high electric field (i.e., reinforced insulation is not applied).
Therefore, if a control signal cable or wire comes into direct contact with a live conductor of
the main circuit, the insulation of the sheath or the cover might break down, which would
expose the signal wire to a high voltage of the main circuit. Make sure that the control
signal cables and wires will not come into contact with live conductors of the main circuits.
Failure to observe these precautions could cause electric shock and/or an
accident.
Maintenance and inspection, and parts replacement
• Turn the power off and wait for at least five minutes before starting inspection. Further,
check that the LED monitor is unlit, and check the DC link circuit voltage between the P (+)
and N (-) terminals to be lower than 25 VDC.
Otherwise, electric shock could occur.
• Maintenance, inspection, and parts replacement should be made only by qualified
persons.
• Take off the watch, rings and other metallic matter before starting work.
• Use insulated tools.
Otherwise, electric shock or injuries could occur.
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