1. The load is too heavy, the load carried by the motor is too heavy, or in other words, the resistance torque of the production machinery exceeds the additional torque of the motor.
2. Use improper overload, for example, increase the operating frequency of the inverter to the extra frequency of the motor, and when the motor runs above the extra frequency, it will enter the constant power operation area, and its useful torque decreases with the rise of frequency, when the useful torque is less than the load torque, the motor is overloaded.
3. Improper overload of functional preset, for example, a production machine is in a light load state, the operating frequency is very low, and the torque increase (U/f ratio) is preset too large, resulting in "overload" due to magnetic circuit saturation during low-frequency operation.
4. The voltage on the motor side is too low
(1) The voltage drop of the line is too large
Because the output voltage of the inverter is already low when running at low frequencies, if the distance between the motor and the inverter is large, and the wire diameter of the connecting wire is thin, the line voltage drop may cause the lack of voltage on the motor side.
(2) Lack of torque improvement
In the U/f control method, the output voltage of the inverter at low frequency operation depends on the amount of torque increase. When the torque increase is small, it will lead to a lack of voltage obtained by the motor.
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1. The operator panel is given The operator panel is a simple frequency setting method of the inverter, and the user can directly change the set rate of the inverter through the potentiometer, digital key or rising and descending keys on the inverter operator panel. The big advantage of the operator panel is that it is simple ...
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The difference between overload and overcurrent of the inverter
(1) The maintenance objectives are different
Overcurrent is mainly used to maintain the inverter, whereas overload is mainly used to maintain the motor. Because the capacity of the inverter sometimes needs to be increased by one or even two gears than the capacity of the motor, in this case, the inverter is not necessarily overcurrent when the motor is overloaded.
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Briefly describe LS ABE203b molded case circuit breaker
The circuit breaker is a fundamental low-voltage electrical appliance, which has the function of overload, short circuit and undervoltage maintenance, and has the ability to maintain the line and power supply. Circuit breaker is an indispensable product in electrical safety. Due to different applications, there are molded case circuit breakers, frame circuit breakers, miniature circuit breakers, etc.
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LG Inverter-LS Inverter-IGXA Sales
LG Inverter LS Inverter IGXA Series ** for sale, its models are as follows:
SV004IGXA-4 60210101W0 Power 0.37KW (Input: 3-phase 380V / Output: 3-phase 0——380V)
SV008IGXA-4 6021010 ...
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Key points of LS power BKN circuit breaker design
(1) The cooperation between the circuit breaker and the circuit breaker should consider the instantaneous trip device action value of the superior circuit breaker, which should be greater than the maximum expected short-circuit current at the outlet end of the lower circuit breaker.
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Grounding of the secondary side of the voltage transformer and the current transformer - power generation
1. The transformer is grounded twice
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Introduction of LS electric power contactors
How LS Contactor Works:
Generally, after the contactor coil is energized, the entire coil current will generate a magnetic field, which will make the core inside have electromagnetic attraction to attract the core, and let their communication contactor point action normally closed contact disconnect, or close, which ...
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Inverter circuit board repair and drawing-free maintenance method - LS power generation
1. Be "confident"
It is necessary to fully understand the principles of some typical circuits and be familiar with them. Guangzhou Kewo Training Center believes that drawings are dead, and the thoughts in the head are alive, able to make analogies, able to reason, and able to touch analogies. For example, switching power supply is always inseparable from ...
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The direct launch of the inverter motor will have a severe impact on the power grid, and it will also have too high requirements for the capacity of the power grid, which is extremely unfavorable to the service life of equipment and power grid circuits.
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