Questions tagged [vfd]

Variable frequency drive, a three-phase AC output motor controller. Questions about vacuum fluorescent displays should not receive this tag.

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17 views

Building a VFD for a split phase (capacitor run) motor?

I'd like to get variable speed on a very tiny lathe (Taig, 4" swing). I've got a dishwasher motor I'm planning on using for it, which is rated for 3600rpm at 60Hz (it's about 1/5HP). But it's a ...
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3answers
75 views

EMC Cable shield used as PE wire, great idea or not?

In order to save on cabling, our company uses 3 wire EMC cables to connect electric machines to their VFD's. Some folks in our company think we should really use a dedicated ground wire, many are of ...
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1answer
39 views

How do VFDs limit the starting current of the motor?

I have a 5 HP three phase motor. I am going to install a variable frequency drive (VFD) for speed control. I know that VFDs are used to soft start motors. How do VFDs limit the starting current of the ...
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20 views

Is V/F maintained constant even in field oriented control or vector control drive of PMSM motors?

I understand that in scalar control V/F is maintained constant below rated speed, as Vector control drive is also a variable frequency drive, I would like to know whether V/F is maintained constant ...
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41 views

Old VFD clocks and wired button problem

So, my friend stumbled across this old article: https://steemit.com/electronics/@gleb-jeglov/how-to-make-a-vfd-clock-step-by-step He gave me couple IV-18 tubes and asked me if I can make similar ...
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1answer
45 views

VFD and motor compatibility

I am looking for a VFD. The motor has following specifications:Motor nameplate YE2-1329-4 and JB/T11707-2013 5.5 kW, 400V, Δ, 11.3 A , 50Hz, CosΘ 0.82, IP 55, 1460 rpm, 87.7. Is above motor ...
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2answers
50 views

380V Wye on motor nameplace,VFD manual requires 220V delta. Will it work?

I removed a motor (nameplate attached) from an eddy current drive. My intention was to replace the controller with a VFD and remove the clutch assembly. The motor obviously ran at full speed with each ...
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1answer
58 views

Maximum Voltage That Can be Applied to a Motor

I was reading about 87Hz technique. I saw we can configure the drive for a motor 400Y/230D as 400V /87hz. I know v/hz ratio should be kept constant and when we configure drive as 400V and 87 Hz and ...
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25 views

Measuring voltage in VFD

I an troubleshooting my chiller because I fried my compressor. I have done clues of what could go wrong, but want to discard over voltage. I have a Mitsubishi VFD. That I take 240 and convert to 240 3 ...
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30 views

Effect of PWM output from Variable Frequency Drive to PSC motor

I looked at VFD diagram and seem like it use Sine-PWM Output without any filter to drive psc single phase ac motor Inductance and capacitance seem to work with pure sine wave but PWM output have a lot ...
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2answers
228 views

How to choose and wire a Variable Frequency Drive [closed]

I have a 1.5 HP 3PH 240V Leeson motor that I want to drive my lathe, but I want to vary the speed. I asked a question on this site about a month ago about how to do that and the recommendation was a ...
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20 views

What scheme would you indicate for a nobreak system with variable frequency output?

I'm pretending to make a system that charge batteries (or a single battery) and then produces 3 independent AC outputs (all having the same common, in a star connection). But I want to have ...
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1answer
295 views

Understanding VFD speed control input using a potentiometer

I am working on hooking up a potentionmeter as a speed control input to a variable frequency drive. Here is are the diagrams from the VFD manual: (Its a Lenze AC Tech SMVector ESV112N01SXB; full ...
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1answer
52 views

VFD Motor Bidirectional Control

So I have a control panel which controls the speed and direction of a motor in a sliding mechanism. the direction can be inverted using a tri-state selector on the panel. the selector input is a ...
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1answer
139 views

VFD for a 3-phase delta-connected 415V~ motor

When a motor starter is to be replaced by a 3-phase 415V~ VFD, can the existing motor be used without changing its winding configuration (star/delta)? The motors are from different manufacturer ...
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2answers
45 views

What exactly is 1.x and 2.0 power scalar V/f control in VFDs?

These are terms that I have come across in multiple operating manuals for VFDs and usually, they just mention that it's used for variable torque applications. My doubt is "what exactly is it?&...
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2answers
64 views

Is upsized reactor allowed for the comparitively less motor HP?

We have a LV-MCC in our commercial outlet having a 480 VAC, 15 HP VFD with line and load reactors in series with it. The VFD is sized for 22.0 A (normal duty), the motor has a horsepower rating of 10 ...
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1answer
148 views

Tesla Model S inverter DC bus voltage

I was recently researching about this Telsa electric car inverters where i found one intresting thing. Usually in the voltage source inverter the DC bus voltage will be around 600 to 650 V considering ...
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1answer
24 views

Delta Servo Drive 220V/400V Series

ASDA-A2 Delta Servo Drives including two types: 220V and 400V series that it seems the difference is input voltage of the Servo Derive. but i doubt 220VAC or 400VAC is line to line voltage or line to ...
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2answers
206 views

Motors Delta/Star connections to VFD

I've selected 230/400V motors (delta/star) and corresponding 400V VFDs for pump motors. Now I've been asked why I haven't selected 400/690V motors (delta/star), that are the standard and usually ...
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1answer
42 views

AC Induction Motor Slip and Torque control Vs V/f control

I am trying to understand this github code for speed control of AC Induction Motor. It calculates slip value to adjust the speed of motor. I wonder if its the same thing that is called constant V/f ...
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1answer
248 views

4-20 mA output from Arduino for VFD

I'm a beginner with electronics, so everything has to be explained in simple terms to me. I have an Arduino with a program which provides a value via the Analog output, so that is anything from 0-5 V....
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1answer
56 views

Why are inverter modules extremely oversized in VFDs?

I was checking a faulty Schneider VFD (ATV312H037N4) which is rated for a nominal output current of 1.5 A. Turns out the rectifier bridge of the inverter module (FP10R12YT3) blew up and after reading ...
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1answer
40 views

Explanation request of a paragraph in a VFD manual about a diode, should I add it or not?

I didn't fully understand this paragraph in a VFD manual: My question is: is the free-weeling diode exist inside the drive, or should I put an external one?
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3answers
99 views

Which frequency is the best for a 3-speed Motor?

Sorry I dont know the appropriate terms that should be used in this subject! I have an inductive motor, it has 3 different speeds (or windings) at 50 Hz: 350 rpm / 700 rpm / 970 rpm I want to ...
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2answers
193 views

Converting single-phase 120 V or 240 V into three-phase 4-wire 120/208 V

I am needing to convert either 240 V or 120 V single-phase into 120/208 V three-phase 4-wire. The load needed is 30 A. My panel can supply up to 100 amps, so the amperage isn't an issue. I've looked ...
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1answer
46 views

suggestions for how to implement a weird VFD jog mode?

I'm a total noob at electronics, but my employer has asked me to try to program a replacement VFD on our industrial stone-cutting saw. Everything works on it now, but I need to figure out how to ...
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4answers
136 views
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3answers
1k views

How many times of a frequency of a PWM can properly generate a sine wave to drive a motor?

I know PWM with dense and loose duty cycle is used to generate sine wave for applications such as 3-phase motor driving. But, How fast does it require to properly generate a sine wave to drive a motor?...
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1answer
162 views

Using a 3-phase Transformer After a Variable Frequency Drive for Voltage Reduction

In the plating industry generally 42V - 3P motors are used to rotate the barrels that hold the products to be plated. This is because the contacts of the barrel cannot be isolated (because barrels are ...
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1answer
31 views

Firing time in VFD inverter

Just a quick one. When looking at schematics for a VFD, I see the same circuits as diodes used in the converter (AC to DC), capacitors in the DC bus and transistors or thyristors used in the inverter ...
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1answer
49 views

Does a load reactor eliminate the need for EMC cabling?

The company I work with installs ventilators driven by VFD's. To save on cost of EMC cabling we use load reactors at the VFD outputs. (Other considerations for not using EMC cabling have to do with ...
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57 views

VFD configured for six-step output instead of SPWM?

I need a transformerless inverter which generates a 3 phase 230 VAC modified sine wave output from 325 VDC input. Unfortunately, it seems these are rare, at least high power models. Can a VFD (with DC ...
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0answers
860 views

isolated 5v PWM to 0-10V

I'm trying to convert a 5V PWM signal to 0-10V through an optocoupler to drive a VFD. The output "0-10V" should be 0V when PWM duty cycle is 0%, and 10V when 100% (linearly !). Here is what I've come ...
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2answers
133 views

Parameters of the 3 phase geared induction motor

I have a 3 phase geared induction motor. The name plate is below image. I couldn't find any datasheet from internet. Explain me parameters that on nameplate for entering to VFD. I need to know Rated ...
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1answer
61 views

Can I operate a 500kW/1500rpms motor at 35Hz with 400kW inverter?

In stock we have a 3 phase induction motor with a rated power 500kW and 1490rpms. What is the smallest frequency inverter which we can use to operate this motor in a machine with a maximum power/...
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1answer
107 views

Variable Frequency Drive with AC motor, 30kW

I have a VFD that controls an AC motor which compresses air. It is an 30kW motor. I have set the parameters required to drive the motor and it runs the motor but not properly. During the test the ...
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1answer
90 views

VFD as general use inverter

I'd like to have 3ph 208 in my house for general use (not a motor). If I run the output of a single phase to 3 phase VFD through inductors or a 1:1 transformer will it smooth the SPWM .output into an ...
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1answer
251 views

Termination of SY cable shield at VFD and 3 phase motor?

I am wiring a single to 3 phase VFD to a 3 phase motor (240V delta). The 3/4HP motor powers a lathe in a domestic setting. Supply voltage is 240V 50Hz. As per the VFD instructions, I am using ...
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3answers
2k views

Braking Methods of Induction Motor in VFD

As you know, we can stop an induction motor by plugging or regenerative braking. What I'd like to know is that when controlling induction motor with VFD, which braking way VFD uses? It seems to me ...
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2answers
2k views

How to Size Line Reactors and Understanding Reactor Specifications

I've got a 600 VAC, 75 HP VFD that I want to place line and load reactors in series with. Usually, I find charts like this that give me a horsepower table to follow as they are the easiest to use. ...
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1answer
69 views

Vcc drops on connecting variable resistor between it and ground

I have a VFD with a control board I am trying to fix. It requires an external variable resistor to be connected between the +10V terminal, analog reference terminal and ground. I found that on ...
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2answers
58 views

How VFD affects an isolated IOT system

To avoid noise from the external system I tried to isolate the internal completely. So I added DC-DC isolated converter with signal isolation. I have attached the picture. Still when reading data and ...
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3answers
2k views

Can a Variable Frequency Drive convert standard wall outlet (120V/15A/single phase) to ~220V 3 phase?

In my workshop I have a device that requires 220V 3 phase power, with a requirement of up to 1.5kVA. In North America, my wall outlet provides ~120V/15A single phases. (EDIT - my device can take +/- ...
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1answer
88 views

Slip Control vs Constant V/F Control for 3-Phase ACIM

I am trying to understand how is Slip Control different from Constant V/F control. If I need to control the speed of 3-phase ACIM then its slip would obviously change with its rotational speed then ...
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1answer
38 views

Speed control using direct torque control of induction motor

Is there any steady state error present in speed output at any load in direct torque control of induction motor?
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1answer
57 views

Voltage source & current input

I am working on a project where I have a current source (analog output from a PLC) controlling a VFD. Based on the position of the dipswitch, the VFD will accept either a current or voltage input. The ...
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1answer
438 views

Motor / VFD / Protective Earth

I have little experience with AC motors since I'm majoring in Mech.E. My team is setting up an AC motor with a VFD to control the movement of an airfoil inside a metal cage we built. I understand the ...
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2answers
243 views

Does a 3-phase VFD work if one phase is reduced (e.g. with a dimmer)?

If you have a 3-phase VFD running a 3-phase motor, and you use a leading or trailing edge dimmer on one or two of the input phases, will the VFD continue to operate normally, pulling more current from ...
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2answers
453 views

Miscalculating the nominal power using nominal current and voltage of a VFD

A variable frequency drive datasheet has current parameters named as I2N and I2hd. If Im not mistaken these currents are the per line currents for the drive output as follows where I showed in red ...