Chapter 1 Safety Information and Precautions
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6. Voltage -sensitive device or capacitor on the output side of the AC drive
Do not install a capacitor for improving power factor, or a voltage sensitive resistor for lightning protection, on
the the output side of the AC drive. This is because the output is a PWM waveform and the AC drive might
suffer transient overcurrent or become damaged.
M
U V W
Capacitor or
voltage-sensitive
resistor
AC
drive
7. Contactor at the I/O terminal of the AC drive
If there is a contactor installed between the input side of the AC drive and the power supply, DO NOTuse it
to start or to stop the AC drive. However, if there is a real and urgent need to use the contactor to start or to
stop the AC drive, make sure the time interval between switching is at least one hour. If the interval between
switching is shorter than one hour, this will reduce the service life of the capacitor inside the AC drive. If there
is a contactor installed between the output side of the AC drive and the motor, do not switch off this contactor
when the AC drive is operating. Damage might occur to components inside the AC drive if you switch off the
output contactor when the AC drive is operating.
380 VAC
50/60 Hz
R
S
T
V
W
U
Contactor KM
Contactor KM or
other switch
M
AC drive
Do not start or stop the AC drive by switching the input
contactor. If you must operate the AC drive by using
the input contactor, wait at least one hour between
switching operations.
Perform switch-on or swich-off ONLY when there is
no output From the AC drive. Otherwise, circuit
breaking may result and damage the AC drive
because KM cannot extinguish the arc normally.
8. When the external voltage exceeds the rated voltage range
Do not operate the AC drive outside the rated voltage range speciîżed in this User Manual. If youoperate the
AC drive outside its rated voltage range, components inside the AC drive might bedamaged. If necessary, use
an appropriate voltage step-up or step-down device to match the supply voltage to the rated voltage range for
the AC drive.
9. Prohibition of three-phase input changed into two-phase input
Do not change a three-phase input of the AC drive into a two-phase input. Failure to comply may result in a
fault or damage to the AC drive.
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