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8. Precautions as to operation
8-1 Precautions as to use
(1) A high-voltage circuit is provided on the printed circuit board.
Never touch it by hand.
(2) The internal circuit remains charged with high voltage for some
time after the power is turned off. Wait for one minute after
turning off the power before inspection.
(3) Never touch the motor output terminal during free-run stop.
(4) The power is not turned off when operation is stopped by the
stop command. Exercise care to prevent an electric shock or
unexpected restart.
(5) Be sure to turn off the power when the machine is not to be used
for a long time, otherwise improper operation may cause an elec-
tric shock.
(6) When operation at the output frequency exceeding 60 Hz is de-
sired, the motor will rotate at a high speed, and the resultant
unstable motor rotation may cause breakdown. Check that the
motor is made especially for high-speed rotation and the safe
operation can be expected when the motor is mounted. It is
recommended to periodically check the equipment for safe op-
eration.
(7) Operation may be unstable at a certain output frequency or un-
der a certain load condition depending on the combination of the
inverter and motor. Sufficiently confirm stability by actual op-
eration.
(8) Check that the input voltage is within the range of rating before
turning the power on. When a voltage exceeding the rated volt-
age is applied, fire or smoke may be generated inside the in-
verter. In addition, abnormal sound may be produced in some
cases.
(9) The side of the inverter will become hot. Install the inverter on
metal or other nonflammables.
(10)Exercise special care so that dust or iron powder will not enter
the inverter.
(11) The electronic thermal activation level setting can be changed.
Use a proper setting according to the motor rating. When more
than one motor is operated in parallel, use an independent ther-
mal relay for each motor. When the power is turned off once, the
electronic thermal function setting is reset. When the above
situation is expected, be sure to use a thermal relay. The motor
may not be protected from overloading when start-stop opera-
tion is repeated frequently; therefore, check the motor tempera-
ture rise.
CAUTION
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Summary of Contents for CAI40C
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