11. For the occasion when the inverter drives the ordinary motor for constant torque operation, long-term low-speed operation should be avoided as much as possible, otherwise the heat dissipation effect of the motor will become worse and the heating will be serious. If long-term operation at low speed constant torque is required, a variable frequency motor must be selected.
12. For the occasion of lifting the load and frequent start and stop, there will be torque, and the appropriate braking resistance needs to be selected, otherwise the inverter will often trip due to overcurrent or overvoltage fault.
13. When the motor has another brake, the inverter should work in the free stop mode, and the braking action signal is only issued after the inverter sends a stop command.
14. The blocking of the external braking resistance of the inverter shall not be less than the requirement of the braking resistance allowed by the inverter. On the premise of meeting the braking requirements, the braking resistance should be larger. Do not short the terminal that should be connected to the brake resistor directly, otherwise, a short circuit accident will occur through the switch during braking.
15. When the inverter is connected to the motor, it is not allowed to use the megohmmeter to measure the insulation resistance of the motor, otherwise, the high voltage output by the megohmmeter will damage the inverter.
16. Correctly handle the problem of speed increase and deceleration. If the acceleration and deceleration time set by the inverter is too short, it is susceptible to "electrical shock" and may damage the inverter. Therefore, when using the inverter, the acceleration and deceleration time should be extended as much as possible under the premise that the load equipment allows.
(1) If the load is heavy, the acceleration and deceleration time should be increased; On the contrary, the acceleration and deceleration time can be appropriately reduced.
(2) If the load equipment needs to be accelerated and decelerated in a short time, it must be considered to increase the capacity of the inverter to avoid too much current and exceed the rated current of the inverter.
(3) If the load equipment needs a very short acceleration and deceleration time (such as within 1S), the braking system should be considered on the inverter. Generally, larger capacity inverters are equipped with a braking system.
17. Avoid the mechanical resonance point of the load equipment. Because the motor is in a certain frequency range, it may encounter the mechanical resonance point of the equipment, resulting in mechanical resonance and affecting the operation of the system. To do this, the frequency converter needs to be set to a skip frequency (or avoidance frequency) and skip (avoid) the frequency to avoid the resonance point.
18. Before the motor is used for the first time or placed for a long time and then connected to the inverter, the insulation resistance of the motor must be measured (with a 500V or 1000V megohmmeter, the measured value should not be less than 5M ohms). If the insulation resistance is too low, it will damage the inverter.
19. The inverter should be installed vertically, with ventilation space, and the ambient temperature should not exceed 40°C.
20. Anti-interference measures must be taken to avoid the normal operation of the inverter being affected by interference, or the higher harmonics generated by the inverter interfering with the normal operation of other electronic equipment.
21. Pay attention to the thermal protection of the motor. If the motor and the inverter capacity are adapted, the thermal protection inside the inverter can effectively protect the motor. If the capacity of the two does not match, the protection value must be adjusted or other protection measures must be taken to ensure the safe operation of the motor.
The electronic thermal protection value of the inverter (motor overload detection) can be set within the range of 25%-105% of the rated current of the inverter.
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1. If there is a sharp acceleration or deceleration, please extend the acceleration and deceleration time.
2. Avoid rapid increase in load.
3. Check whether there is a short circuit in the UVW of the motor terminal.
4. The module is damaged, and the drive circuit is damaged, resulting in an overcurrent alarm.
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Megmeet inverter – the difference between voltage type inverter and current type inverter
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Maintenance inspection of Megmeet inverters
1. The Megmeet rectifier module is damaged
It is usually caused by grid voltage or internal short circuit. In the case of sweeping the internal short circuit, the rectifier bridge is replaced. When dealing with faults on site, we should focus on checking the status of the user's power grid.
Such as the power grid voltage, whether there is an electric welding machine, etc.
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