1. What issues should be considered when selecting a frequency converter?
● Inverter capacity selection
● Inverter type selection (general-purpose inverter, high-performance inverter and special-purpose inverter)
● Based on cost-effectiveness
● Based on after-sales service
2. Can the capacity of the motor used in the frequency converter be used as a selection criterion?
Using the capacity of the motor as the basis for selection is inappropriate. When selecting a frequency converter, it is also necessary to compare the rated current and maximum operating current of both the frequency converter and the motor.
3. Under what circumstances can the inverter be selected according to the motor capacity specified in the instruction manual?
● Continuous and constant load
● The motor has a large margin.
● The inrush current of the electric motor is very short.
4. Under what circumstances is it necessary to consider increasing the capacity of the frequency converter?
● The rated current of the frequency converter is too low.
● The motor may be briefly overloaded.
● Special requirements for acceleration and deceleration time
● Impact load
5. How to select the inverter capacity when one inverter drives multiple motors?
● For simultaneous starting and operation of multiple motors, simply ensure that the rated current of the frequency converter is greater than the sum of the rated currents of the multiple motors.
● When starting multiple motors separately, the direct starting current of the motor starting later must be considered.
6. What are the main characteristics of the different control methods of frequency converters?
7. What are the environmental requirements for frequency converters?
● Ambient temperature – generally -10 to +40℃; derating is required between 40 and 50℃, with the rated output current reduced by 1% for every 1℃ increase in temperature. If the ambient temperature is too high and temperature fluctuations are large, the inverter's insulation will be significantly reduced, affecting its lifespan.
● Ambient humidity - The relative humidity of the air around the inverter is ≤95% (no condensation). Depending on the on-site working environment, it may be necessary to add desiccant and heater in the inverter cabinet.
● Vibration and Shock: Avoid exposure to vibration and shock.
● The electrical environment should be protected against electromagnetic interference.
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