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Home » Frequency inverter
Single phase inverter normally is used in 200V AC to 240V AC in low
power applications, like small pumps. The AC motor's input need to be
three phase as all of the inverters are three phase output. In our
factory, the 1 phase inverters power is from 0.5HP to 3HP.
This single phase inverter is the updated generation driver. Due to the new technology being used in the inverters, this single phase inverter is in high performance & more stable against the old one. Also, the updated 1 phase inverter which is manufacturing by Gozuk in China, has inherit the advantage features, like vector control, RS 485 communication, powerful overload ability and much more.
Single phase inverter features
This single phase inverter is the updated generation driver. Due to the new technology being used in the inverters, this single phase inverter is in high performance & more stable against the old one. Also, the updated 1 phase inverter which is manufacturing by Gozuk in China, has inherit the advantage features, like vector control, RS 485 communication, powerful overload ability and much more.
Single phase inverter features
- Input voltage: 1 phase 220V, 230V, 240V
- Output voltage: 3 phase rated input voltage
- Power range: 0.4kW to 2.2kW
- Vector control single phase inverter
- Multiple programmable multi-function input/output terminals
- Special speed tracking function without impact
- Rich fault protection and operation monitoring function
- 32 bit high speed CPU special for AC motor control
- Low frequency with high start torque: 0.5Hz/150%
- Simple PLC with multi-step control function
- Built-in brake unit
- Offer RS485, support MODBUS-RTU communication protocol
- Close-loop control with built-in PID
- Dynamic torque current control, rapid response to load's change
- Load distribution control function
- Online modify and check parameters of the inverters
- Wobble frequency control special for spinning
- Simple servo fixed-length control function
Tags: inverter, Single phase inverter
Adjusting
speed of auxiliary equipments such as fan and pump by variable frequency
technology makes each parameter at the best state, which improves
operation, enhances efficiency and saves power, water and coal, reduces
production cost, brings lots of benefits for power plant. Meanwhile,
inverter cooperates with control system of units, which can improve
automatization level, save labour, enhance management level of whole
system.
There are two aspects for inverter development in power plant. One is inverter itself development; the other is how to cooperate with progress of plant production technology and automatization.
For inverter itself development: development in big capacity and small dimension, modularization, voltage withstand and hardware universal are research goals in short time.
For application in power plant: manufacturer should improve inverter self-detection function; restore inverter fault quickly; solve problem of damper and valve quick response; digital connection to central system and so on. Furthermore, anti-dirt, heat, anti-disturbance and reliability should be researched and explored for a better mode.
There are two aspects for inverter development in power plant. One is inverter itself development; the other is how to cooperate with progress of plant production technology and automatization.
For inverter itself development: development in big capacity and small dimension, modularization, voltage withstand and hardware universal are research goals in short time.
For application in power plant: manufacturer should improve inverter self-detection function; restore inverter fault quickly; solve problem of damper and valve quick response; digital connection to central system and so on. Furthermore, anti-dirt, heat, anti-disturbance and reliability should be researched and explored for a better mode.
Tags: inverter, Medium voltage inverter
Normal start
At normal start status, inverter will start and operate at given frequency in open loop mode, or operate at the expected value of the controlled object in closed loop mode.
Soft start
At soft start status, inverter will start and accelerate to the frequency of power grid regardless of the given frequency. When the output frequency of inverter reaches the frequency of power grid (set in main interface), then the output of inverter will become 0, at the same time inverter sends 'transfer to power grid' command. This command can make the control circuit to transfer the power supply of the motor from inverter to the power grid. During the transient transfer, there is a big inrush current.
For synchronous transfer (OPTIONAL FUNCTION, synchronous transfer reactor is required), both inverter and power grid will supply the power to the motor during the transient transfer, there is very small inrush current.
At normal start status, inverter will start and operate at given frequency in open loop mode, or operate at the expected value of the controlled object in closed loop mode.
Soft start
At soft start status, inverter will start and accelerate to the frequency of power grid regardless of the given frequency. When the output frequency of inverter reaches the frequency of power grid (set in main interface), then the output of inverter will become 0, at the same time inverter sends 'transfer to power grid' command. This command can make the control circuit to transfer the power supply of the motor from inverter to the power grid. During the transient transfer, there is a big inrush current.
For synchronous transfer (OPTIONAL FUNCTION, synchronous transfer reactor is required), both inverter and power grid will supply the power to the motor during the transient transfer, there is very small inrush current.
Tags: inverter, Definition
Quality inverters incorporate either an AC Reactor or DC Reactor (choke). Their inclusion in the basic design of the inverter allows the design engineer to maximize the advantages of the choke. Their function is to reduce the current distortion caused by the input stage rectifiers by slowing the rate of change of current, and thus charging the internal capacitor at a slower rate over a longer time.
Some inverters allow aftermarket fitment of DC chokes but access to the DC bus is required. While it is easy to add AC chokes to the input stage, there is a disadvantage of voltage drop to the inverter that may have to be considered.
The Harmonic Distortion caused by an inverter is related to its size & load, choke size, and the supply network parameters.
With no AC Reactor or DC Choke, the harmonic distortion will be greater.
Some inverters allow aftermarket fitment of DC chokes but access to the DC bus is required. While it is easy to add AC chokes to the input stage, there is a disadvantage of voltage drop to the inverter that may have to be considered.
The Harmonic Distortion caused by an inverter is related to its size & load, choke size, and the supply network parameters.
With no AC Reactor or DC Choke, the harmonic distortion will be greater.
Tags: inverter, Accessories
1 phase inverter normally is for small power electric AC motor speed control applications, with single phase 220V to 240V input and output 3 phase voltage (lower than input voltage), due to the compact design, this type inverter can be installed in a small space easily.
Single phase inverter specification:
Single phase inverter specification:
- Power range: 0.4kW to 2.2kW
- Input voltage: 220V, 230V, 240V fluctuate rate 15% plus-minus
-
Output voltage: 0 to rated input voltage, three phase
- Sensorless vector control inverter
- Output high torque under very low frequency
- Rich fault protection function to monitor operation record
- Dynamic torque control, rapid response according to load's change
- Built-in braking unit to allow accurate control
- Provide RS-485, Modbus-RTU to communicate with PLC
- Simple PLC control with multi-step program terminals function
- Check & modify inverters parameter online
- Built-in PID for close loop control mode
- 32 bit high speed CPU in fast calculation
From a manufacturing economics standpoint, there is often a trade off in the decision to add a DC bus choke or not based on its ability to reduce the DC bus ripple. This is because it can reduce the DC bus capacitance necessary to present a clean DC source to the transistors. For some frequency inverter manufacturers who have the internal capability to wind their own component chokes, this often represents a component cost benefit compared to buying capacitors from outside vendors and being more subject to market volatility. On the other hand if the inverter manufacturer IS also a manufacturer of capacitors, it works exactly the other way around.
I believe this is why we often see small component class drives being made without DC chokes primarily by companies, mostly in Asia, for whom capacitors are a very low cost commodity. When EU and US manufacturer make larger inverters, it's usually less expensive for them to wind chokes, but that option is often perceived to be too physically large for component class drives so they farm out their designs and production to Asian manufacturers. Ironically then, users will add an external AC reactor anyway, but fail to observe that the overall footprint is now larger than it would have been with a DC choke.
I believe this is why we often see small component class drives being made without DC chokes primarily by companies, mostly in Asia, for whom capacitors are a very low cost commodity. When EU and US manufacturer make larger inverters, it's usually less expensive for them to wind chokes, but that option is often perceived to be too physically large for component class drives so they farm out their designs and production to Asian manufacturers. Ironically then, users will add an external AC reactor anyway, but fail to observe that the overall footprint is now larger than it would have been with a DC choke.
An inverter can operate down to its minimum designed frequency, however the motor design and load characteristics determine the minimum PRACTICAL frequency. If the motor is force cooled and the frequency inverter is operated in vector mode, as long as there is encoder feedback, and the load is not excessive, it is possible to achieve 100% torque at zero frequency.
Tags: inverter, Definition