1. Schneider inverter uses analog output port to indicate the motor frequency, when the motor frequency is 50Hz, why is the output only 16mA?
Answer: Because of the large output frequency parameter "TFR" of the inverter, the factory default value is 60Hz. So when the inverter output is 50Hz, the analog output is 16mA. In this case, just change the "TFR" parameter to 50Hz.
2. What is the basic equipment of the Schneider ATV71/61 inverter specification product powered by three-phase 380V power supply?
Answer: Chinese LCD screen: 15KW below optional accessories, 15KW above standard. DC incoming reactor: 0.75kw-15kw without built-in DC reactor, optional as an accessory when needed; The DC reactor of the standard product of more than 90KW is delivered with the inverter, and the user needs to assemble it according to the installation drawing, if the DC reactor is not ordered, add a "D" at the end of the model; 18.5KW-75KW has been built-in. EMC input filters: All have built-in EMC.
3. Why is the use of inverter for fan and pump loads to save energy?
Answer: According to the fundamental law of fluid mechanics, it can be known that the fan pump load is a typical square rotation load, and its main characteristics are: the speed n has the following relationship with the torque T and the load power P: T∝n2, P∝n3. That is, the torque is proportional to the square of the speed, and the power is proportional to the cube of the speed. Usually the fan pump load is mostly selected according to the amount of full load operation, and most of the time in actual use is not in the full load state, so as long as the average speed decreases slightly, the load power will drop very quickly, so as to achieve the effect of energy saving. But when choosing the motor direct starting mode, because the speed can not be adjusted, the wind baffle, the valve is commonly used to regulate the air volume or flow, so that not only the waste of power is formed, but also because the excessive starting current forms the power grid impact and the vibration and water hammer phenomenon of the equipment, when the frequency converter is selected to regulate the speed, the speed can be conveniently controlled according to the actual process demand. For example, when the motor speed is 80% of the extra speed, the load power is the third power of the extra power (80%), that is, about 50%. In this way, it can be seen that the speed is reduced by 20%, and the energy saving is more than 40%. Together, it can easily complete closed-loop constant voltage control, and the energy-saving power will be further improved. The use of inverter avoids the impact on the power grid when starting, reduces the equipment failure rate, eliminates the vibration and water hammer phenomenon, prolongs the service life of the equipment, and also reduces the capacity requirements and reactive power loss of the power grid.
4. How to complete the control of Schneider inverter ATV38 and ATV58 through the operation panel?
Answer: First of all, in the control menu, set "LCC" to "YES" (panel operation); Enter the "LFR" parameter in the adjustment menu, press the up and down keys to adjust the given value, and complete the control of the inverter.
5. How can multiple ATV71/61 inverters connected to the same bus communicate with a graphical display terminal?
Answer: [Communication] menu→ [Network MODBUS] → [MODBUS Address] (ADD) to set the address of each inverter. When multiple inverters are connected to the same display terminal, the terminal will actively display the inverter address. It is possible to access all menus in multipoint mode, but does not allow the graphical display of terminal control of the inverter.
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