Sanjin Elevator: Elevator inverter plays what role in the elevator

Sanjin Elevator: Elevator inverter plays what role in the elevator: If the given acceleration time is too short, the elevator inverter output frequency changes much more than speed (electrical angular freque...

Elevator inverter plays what role in the elevator

If the given acceleration time is too short, the elevator inverter output frequency changes much more than speed (electrical angular frequency) change, the drive will overcurrent flows due to trip, running stop, which is called stall. In order to prevent stalling of the motor continues to run, it is necessary for detection of the current size of the frequency control. When the acceleration current is too large appropriate to slow down the acceleration rate. Deceleration as well. Combine the two is the stall function.
Acceleration and deceleration can be respectively given model, for quick acceleration, slow deceleration occasions, or for a small machine requires strict tact time given occasion is appropriate, but for the fan drive and other occasions, acceleration and deceleration time longer acceleration time and deceleration time can be given together.
If you lower the motor during operation command frequency, the motor becomes non-state synchronous generator running, while working as a stopper, which is called regenerative (electric) braking.
Regenerative energy from the motor out of the piling in the elevator inverter filter capacitor, the capacitance of the capacitor and the voltage relationship between the general frequency of the rated torque of the regenerative braking force of 10% -20%. If using the optional parts brake unit, can reach 50% -100%.
Automatic control system signal can be set freely by the elevator inverter flexible frequency change command and control process indicators, such as in the tobacco industry, sugar, spices process, known by the belt drive traffic signals to control the frequency of the rotational speed of the pump with the flow signal changes automatically adjust feeding amount evenly add flavor, sugar. Production line can also use start-stop signal through the positive and negative terminals of the elevator inverter control starting and stopping and positive, reverse and become a part of automatic assembly line. In addition, in the assembly line, the current device is faulty rear side equipment should be automatically shut down. elevator inverter emergency stop client can achieve this functionality. In SANKEN, MF, FUT and FVT series elevator inverter can be pre-set three or four or even up to seven frequencies, some devices can be set accordingly automated production processes. Set frequency and time, the drive motor can sequentially at different times with different speed operation, to form an automated production process.

Sanjin Elevator: Elevator inverter plays what role in the elevator ...

Sanjin Elevator: Elevator inverter plays what role in the elevator ...: Frequency down (low), if the same power output, the current increases, but under certain conditions, the torque current is almost constant....

Elevator inverter plays what role in the elevator (b)

Frequency down (low), if the same power output, the current increases, but under certain conditions, the torque current is almost constant.
Using elevator inverter operation, with a corresponding increase in the acceleration of the motor frequency and voltage, the starting current is limited to 150% of rated current (according to different models, 125% -200%). Labor-frequency power directly when starting current of 6-7 times, therefore, will have an impact on the mechanical and electrical. With elevator inverter drive can smoothly start (start time becomes longer). Starting current of 1.2-1.5 times the rated current, starting torque of 70% -120% of the rated torque; For enhanced functionality with automatic torque converter, the starting torque of 100% or more, you can start with a full load .
Frequency drops voltage V is also proportional to the decline, the question has been answered four instructions. The ratio between V and F are considered characteristic of the motor determined in advance, usually in the controller memory means (ROM) in that there are several features that can switch or the dial to select.
Down completely when the frequency is reduced proportionally to the voltage, the impedance becomes smaller as the DC resistance constant, would result in a low torque is generated under a reduced tendency to. Therefore, given the low frequency V / F, the output voltage is increased to make some manner so as to obtain a starting torque, this compensation called enhanced start. Variety of methods can be used, a method of automatically select V / F mode or adjusting potentiometer and other methods.
In 6Hz still output power, but according to the temperature rise and motor starting torque of the size of the other conditions, the lowest frequency of use to take 6Hz, at which point the motor rated torque can be output without causing severe heat problems. Actual elevator inverter output frequency (starting frequency) based on models for the 0.5-3Hz.
Normally when not. Above 60Hz (50Hz or more modes also) voltage constant, a substantially constant power characteristics, require the same torque at high speed, we must pay attention to the choice of motor and elevator inverter capacity.
Motor means to be used for speed detection device (PG), the actual speed back to the control means controls, called "closed loop", without PG operation is called "open loop." Universal Converter, mostly open-loop mode, and some models can be use PG feedback option.
Open-loop, the elevator inverter even if the output for a given frequency, the motor with a load operation, the motor speed in the range of the rated slip (1% -5%) change. For applications requiring speed accuracy is relatively high, even if the load change also requires close to a given speed operation of the occasion, PG feedback function can be used with the drive (optional part).
With PG feedback function of the elevator inverter, the accuracy improves. But the speed depends on the accuracy of implant PG itself elevator inverter output frequency accuracy and resolution.

Sanjin Elevator: Elevator inverter plays what role in the elevator ...

Sanjin Elevator: Elevator inverter plays what role in the elevator ...: The main role of the elevator inverter by changing the frequency of alternating current, energy efficiency and speed, and to achieve automa...

Elevator inverter plays what role in the elevator (a)

The main role of the elevator inverter by changing the frequency of alternating current, energy efficiency and speed, and to achieve automatic control and precision control.
The elevator inverter is the use of power semiconductor devices will be the role-off frequency to another frequency power conversion power control devices. Can be divided into AC - AC elevator inverter, AC - DC - AC elevator inverter. AC - AC elevator inverter alternating current into direct are variable frequency and voltage AC; AC - DC - AC elevator inverter is first rectified alternating current into direct current by the rectifier first, and then through the elevator inverter to the DC current and voltage can be changed into a frequency of alternating current.
PWM is the English Pulse Width Modulation (Pulse Width Modulation) acronym, according to certain rules to change the pulse width of the pulse train to adjust the output volume and a tone waveform by value. PAM is the English Pulse Amplitude Modulation (pulse amplitude modulation) acronym is changed according to certain rules pulse amplitude pulse train, to regulate the output value and a modulation waveform.
elevator inverter main circuit can be divided into two categories: voltage is converted to DC voltage source elevator inverter AC and DC circuit filter is a capacitive; Current DC current source is converted to AC elevator inverter, its stone DC circuit filter inductor.
Asynchronous motor torque and the rotor flux of the motor a current flows resulting from the interaction between the rated frequency, if the voltage is fixed and only reduce the frequency, then the magnetic flux will be too large, the magnetic circuit saturation, severe when burning motor. Therefore, the frequency and voltage proportional to a change, that is to change the frequency converter output voltage while controlling the motor to maintain a certain flux, to avoid weakening and magnetic saturation phenomenon. This control method is used for fan and pump energy-saving elevator inverter.

Sanjin Elevator: Routine maintenance of the elevator inverter

Sanjin Elevator: Routine maintenance of the elevator inverter: Application has been common drive fans, pumps, etc. to expand into the food, beverage, logistics, elevator drive internal structure buildin...