1. Why is the inverter used for fan and pump loads to save energy?
According to the basic law of fluid mechanics, it can be seen that the fan pump load is a typical square rotation load, and its primary feature is that 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 load of the fan pump is mostly selected according to the amount of full load operation, and most of the time in practice is not in the full load situation, so as long as the uniform speed drops slightly, the load power will drop very quickly, and then reach the energy saving effect.
However, when the motor direct starting method is selected, because the speed can not be scheduled, the wind shield and valve are often used to schedule the air volume or flow, which not only forms the waste of power but also forms the power grid impact and the flutter and water hammer of the equipment because of the excessive starting current.
When the inverter is selected to regulate the speed, the speed can be easily controlled according to the practical technical requirements. For example, when the motor speed is 80% of the rated speed, the load power is the cubic of the rated power (80%), that is, 50% is dominant. It can be seen that the speed is reduced by 20%, and the energy saving is more than 40%. Together, closed-loop constant voltage control can be easily completed, and the energy saving efficiency will be further advanced. The use of inverter avoids the impact on the power grid when starting, reduces the equipment failure rate, eliminates the flutter and water hammer phenomenon, extends the service life of the equipment, and also reduces the capacity request and reactive power loss of the power grid.
2. What is the basic equipment of the standard product of ATV71/61 inverter powered by three-phase 380V power supply?
Chinese LCD screen: 15KW below is optional, 15KW or more is standard.
DC incoming line reactor:
0.75kw-15kw without built-in DC reactor, optional as an accessory when needed;
The standard product DC reactor of more than 90KW is delivered with the inverter, and the user needs to follow the equipment diagram and equipment, assuming that the DC reactor is not ordered, and add a "D" at the end of the type;
18.5KW-75KW has been built-in. EMC input filters: All have built-in EMC.
3. How to complete the control of ATV38 and ATV58 through the operation panel?
First, 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.
4. How to communicate between multiple ATV71/61 inverters connected to the same bus and a graphic flash terminal?
The [Communication] menu → [Network MODBUS] → [MODBUS Address] (ADD) to set the address of each inverter.
When multiple drives are connected to the same flash terminal, the terminal actively flashes the drive address.
In the multipoint format it is possible to visit all menus, but does not allow the terminal to be controlled by a graphic flash. |
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