1.2.5 Motor Heat and Noise
Since the output voltage of inverter is PWM wave and contains certain
harmonics, the temperature rise, noise and vibration of the motor will be higher than
those when it runs at standard frequency.
1.2.6 Voltage-sensitive Device or Capacitor Improving Power Factor at the
Output Side
Since the inverter output is PWM wave, if the capacitor for improving the
power factor or voltage-sensitive resistor for lightning protection is mounted at the
output side, it is easy to cause instantaneous over current in the inverter, which may
damage the inverter. It is recommended that such devices not be used.
1.2.7 Switching Devices like Contactors Used at the Input and Output terminal
If a contactor is installed between the power supply and the input terminal of
the inverter, it is not allowed to use the contactor to control the startup/stop of the
inverter. If use of such contactor is unavoidable, it shall be used with interval of at
least one hour. Frequent charge and discharge will reduce the service life of the
capacitor inside the inverter. If switching devices like contactor are installed
between the output end of the inverter and the motor, it shall ensure that the on/off
operation is conducted when the inverter has no output. Otherwise the modules in
the inverter may be damaged.
1.2.8 Use under voltage rather than rated voltage
If the C220/C420 series inverter is used outside the allowable working
voltage range as specified in this manual, it is easy to damage the devices in the
inverter.
When necessary, use the corresponding step-up or step-down instruments to
change the voltage.
1.2.9 Change Three-phase Input to Two-phase Input
It is not allowed to change the C220/C420 series three-phase inverter into
two-phase one. Otherwise, it may cause fault or damage to the inverter.
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