How much energy saving is possible with the help of Variable Frequency Drive (VFD)?
The energy saving in case of fans, blowers and pumps is possible to the extent of 30...60 % depending upon the operating point, numbers of hours per year and the pressure drop tolerable to the system. In case of compressor the energy saving to the extent of 15...20 % is possible depending upon the loading - unloading cycle and operating hours per annum of the compressor.
How energy is saved in case of compressor by using Variable Frequency Drive?
The Variable Frequency Drive reduces the no load losses of the compressor motor by reducing the unloading time of operation. It reduces the pressure difference between high cutout pressure and low cut-in pressure by precise speed control of compressor motor and by using PID controller.
What countermeasures are provided against instantaneous power failure?
All our VFD incorporates power loss ride-through control, auto-restart function and KEB function, so that it does not trip in case of an instantaneous power failure. The power loss ride-through control / KEB function continues operation even after the momentary power failures. You can keep operating the motor without tripping in case of an instantaneous power failure by taking advantage of this function.
Can I connect the power factor improvement capacitor at the input or output of the inverter?
No, You cannot connect power factor improvement capacitors at the inverter's input or output end. Output capacitors can generate high currents containing high frequency components, resulting in the inverter tripping because of over current. This can also have adverse effects on the capacitors. To improve the power factor, insert an input AC reactor (optional) on the inverters input side.
Where can we connect brake motor?
We can connect brake motor's circuit to the inverters power supply side because if the braking circuit is directly connected to the inverters output terminals, the brake cannot be released because of the lowered starting voltage.
What is multi-pump control feature?
Multi-pump control refers to operating up to six pumps (one variable speed control pump, and up to five ON/OFF control pumps) in parallel using five relay outputs provided in the inside of one VT240S. The pressure in the glow passage is controlled to be constant. The pressure step of the ON/OFF controlled pumps is interpolated by a pump which is controlled by the VT240S Variable Frequency Drive, which has the PID control function. This maintains the pressure's continuation. The relay output used for the pump's ON/OFF control are the VT240S standard relay output and the relay interface option relay output. This function is also available in Axpert-Eazy+ Series and Axpert-Eazy Series VFD.
What is Inverter?
If load is regenerative as in case of Centrifugal lift, Traction drive, Paper industry, wire - winding then one can use PWM converter or active front - end converter at the input of inverter to make a four quadrant drive.
What is Soft Starter?
Soft starter is also called as solid state starter as it does not use any moving part such as contractor, relay, moving wipe and so on, which may be used in star delta starters.
What is Medium voltage Drive (MVD)?
The AC Drive which can provide direct high voltage to the motor without any output transformer or filter. Axpert-Hivert Series Medium Voltage VFD offers a simple, reliable, cost-effective power structure that is easy to apply to a wide voltage and power range. It is highly used for speed regulation, energy savings, soft-startup and intelligent control of the medium voltage motors in industries such as thermal power plants, petroleum, chemical, mining, cement and metallurgy. If you are looking for MV-VFD then Amtech is the best supplier for these products.
What is Scalar drives?
Scalar drive are V/F drives which can satisfy 95 % of the total application of variable or adjustable frequency drive.
What is Vector Drives?
Vector control is a mathematical algorithm implemented inside the controller of the VFD using motor model to provide higher torque and faster dynamic response. Only about 5% of the total application requires very fast control of torque and speed requires the vector drive.
