Safety and Precautions MD280/MD280N User Manual
When the motor is used for the first time, or when the motor is reused after
being kept, or when periodical inspection is performed, it shall conduct
motor insulation inspection so as to avoid damaging the inverter because
of the insulation fault of the motor windings. The motor wires must be
disconnected from the inverter during the insulation inspection. It is
recommended to use the 500V megameter, and the insulating resistance
measured shall be at least 5Mȍ.
1.2.2 Thermal Protection of the Motor
If the ratings of the motor does not match those of the inverter, especially
when the rated power of the inverter is higher than the rated power of the
motor, the relevant motor protection parameters in the in the inverter shall
be adjusted, or thermal relay shall be mounted to protect the motor.
1.2.3 Running with Frequency higher than Standard Frequency
This inverter can provide output frequency of 0Hz to 300Hz. If the user
needs to run the inverter with frequency of more than 50Hz, please take the
resistant pressure of the mechanical devices into consideration.
1.2.4 Vibration of Mechanical Device
The inverter may encounter the mechanical resonance point at certain
output frequencies, which can be avoided by setting the skip frequency
parameters in the inverter.
1.2.5 Motor Heating 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
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