1. Why does the maintenance function of the inverter operate when the clutch is connected to the load?
When the load is connected with a clutch, at the moment of connection, the motor changes sharply from the no-load condition to the area with a large slip rate, and the large current flowing through causes the inverter to trip over the current and cannot work.
2. Why is the inverter stopped when the large motor is running together in the same factory?
When the motor starts, the starting current corresponding to the flow rate and capacity, the transformer on the stator side of the motor produces a voltage drop, and when the motor capacity is large, the voltage drop is also large, and the inverter connected to the same transformer will make the judgment of undervoltage or instantaneous stop, so sometimes the maintenance function (IPE) action will form a stop operation.
3. What is Frequency Conversion Resolution? What's the point?
In the case of digitally controlled frequency converters, the output frequency is given in stages, even if the frequency command is an analog signal. The smallest unit of this gradient is called the variable resolution. The frequency conversion resolution is generally 0.015-0.5Hz. For example, if the resolution is 0.5Hz, then the top of 23Hz can be changed to 23.5 and 24.0Hz.
4. Is it possible to put the motor directly into a fixed frequency inverter without using soft start?
It is possible at very low frequencies, but if the given frequency is high, the same power supply is near the condition of direct starting. The large starting current (6-7 times the rated current) will flow excessively, because the inverter blocks the overcurrent, and the motor cannot start.
5. What problems should be paid attention to when the motor works beyond 60Hz?
When working above 60Hz, the following precautions should be taken:
(1) Machinery and equipment should have sufficient potential to work at this speed (mechanical strength, noise, vibration, etc.).
(2) When the motor enters the constant power output scale, its output torque must be able to maintain the work (the output power of the shaft such as the fan and pump increases proportionally to the cube of the speed, so it is necessary to pay attention to the speed when the speed increases slightly).
(3) The life of the bearing should be fully considered.
For medium-capacity motors, especially 2-pole motors, it is necessary to consult carefully with the manufacturer when working above 60Hz.
6. Can the inverter drive the gear motor?
According to the structure and smoothing method of the reducer, there are several problems that need to be paid attention to. In the structure of the gear, 70-80Hz can generally be considered as the maximum limit, and when the oil is smooth, it is related to the damage of the gear when the oil is smooth, and the continuous work at low speed is related to the damage of the gear.
7. Can the inverter be used to drive a single-phase motor? Is it possible to use a single-phase power supply?
Single-phase motors are basically unusable. In the case of a single-phase motor with governor switch starting, the auxiliary windings will be burned out at the speed regulation scale below the operating point; Regarding the capacitor starting or capacitor working method, the capacitor will be induced to burst. The power supply of the inverter is generally 3 phases, but there are also models that operate with a single-phase power supply for small capacitances.
8. How much power does the inverter consume?
It is related to the type, working condition, and frequency of use of the inverter, but it is difficult to answer. However, the power of the inverter below 60 Hz is about 94%-96%, and the loss can be calculated based on this, but the built-in regenerative braking (FR-K) inverter will increase the power consumption if the loss during braking is also taken into account, so it is necessary to pay attention to the design of the operation panel.
9. Why can't it be used in the whole area of 6-60Hz?
Generally, the motor uses the outer fan installed on the shaft or the blades on the rotor end ring for cooling, and if the speed drops, the cooling effect decreases, so it cannot accept the same heat as high-speed work, and the load torque must be reduced at low speed, or the combination of a large-capacity inverter and the motor, or the use of a special motor.
10. What should I pay attention to when using a motor with a brake?
The power supply of the brake excitation circuit should be taken from the input side of the inverter. If the brake actuates while the inverter is outputting power, an overcurrent block will be formed. Therefore, it is necessary to stop the output of the inverter before activating the brake.
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